mozilla-central/dom/events/EventStateManager.cpp (file symbol)

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "EventStateManager.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/Attributes.h"
#include "mozilla/EditorBase.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventForwards.h"
#include "mozilla/Hal.h"
#include "mozilla/HTMLEditor.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/Likely.h"
#include "mozilla/FocusModel.h"
#include "mozilla/MiscEvents.h"
#include "mozilla/MathAlgorithms.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/PointerLockManager.h"
#include "mozilla/PresShell.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/ScrollTypes.h"
#include "mozilla/TextComposition.h"
#include "mozilla/TextControlElement.h"
#include "mozilla/TextEditor.h"
#include "mozilla/TextEvents.h"
#include "mozilla/TouchEvents.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/dom/BrowserBridgeChild.h"
#include "mozilla/dom/BrowsingContext.h"
#include "mozilla/dom/CanonicalBrowsingContext.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/DOMIntersectionObserver.h"
#include "mozilla/dom/DragEvent.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/FrameLoaderBinding.h"
#include "mozilla/dom/HTMLLabelElement.h"
#include "mozilla/dom/HTMLInputElement.h"
#include "mozilla/dom/MouseEventBinding.h"
#include "mozilla/dom/BrowserChild.h"
#include "mozilla/dom/PointerEventHandler.h"
#include "mozilla/dom/UIEvent.h"
#include "mozilla/dom/UIEventBinding.h"
#include "mozilla/dom/UserActivation.h"
#include "mozilla/dom/WheelEventBinding.h"
#include "mozilla/glean/ProcesstoolsMetrics.h"
#include "mozilla/ScrollContainerFrame.h"
#include "mozilla/StaticPrefs_accessibility.h"
#include "mozilla/StaticPrefs_browser.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/StaticPrefs_mousewheel.h"
#include "mozilla/StaticPrefs_ui.h"
#include "mozilla/StaticPrefs_zoom.h"
#include "ContentEventHandler.h"
#include "IMEContentObserver.h"
#include "WheelHandlingHelper.h"
#include "RemoteDragStartData.h"
#include "nsCommandParams.h"
#include "nsCOMPtr.h"
#include "nsCopySupport.h"
#include "nsFocusManager.h"
#include "nsGenericHTMLElement.h"
#include "nsIClipboard.h"
#include "nsIContent.h"
#include "nsIContentInlines.h"
#include "mozilla/dom/Document.h"
#include "nsICookieJarSettings.h"
#include "nsIFrame.h"
#include "nsFrameLoaderOwner.h"
#include "nsIWeakReferenceUtils.h"
#include "nsIWidget.h"
#include "nsLiteralString.h"
#include "nsPresContext.h"
#include "nsTArray.h"
#include "nsGkAtoms.h"
#include "nsIFormControl.h"
#include "nsComboboxControlFrame.h"
#include "nsIDOMXULControlElement.h"
#include "nsNameSpaceManager.h"
#include "nsIBaseWindow.h"
#include "nsFrameSelection.h"
#include "nsPIDOMWindow.h"
#include "nsPIWindowRoot.h"
#include "nsIWebNavigation.h"
#include "nsIDocumentViewer.h"
#include "nsFrameManager.h"
#include "nsIBrowserChild.h"
#include "nsMenuPopupFrame.h"
#include "nsIObserverService.h"
#include "nsIDocShell.h"
#include "nsSubDocumentFrame.h"
#include "nsLayoutUtils.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsUnicharUtils.h"
#include "nsContentUtils.h"
#include "imgIContainer.h"
#include "nsIProperties.h"
#include "nsISupportsPrimitives.h"
#include "nsServiceManagerUtils.h"
#include "nsITimer.h"
#include "nsFontMetrics.h"
#include "nsIDragService.h"
#include "nsIDragSession.h"
#include "mozilla/dom/DataTransfer.h"
#include "nsContentAreaDragDrop.h"
#include "nsTreeBodyFrame.h"
#include "nsIController.h"
#include "mozilla/Services.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/Record.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/Preferences.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/ProfilerLabels.h"
#include "Units.h"
#ifdef XP_MACOSX
# import <ApplicationServices/ApplicationServices.h>
#endif
namespace mozilla {
using namespace dom;
static const LayoutDeviceIntPoint kInvalidRefPoint =
LayoutDeviceIntPoint(-1, -1);
static uint32_t gMouseOrKeyboardEventCounter = 0;
static nsITimer* gUserInteractionTimer = nullptr;
static nsITimerCallback* gUserInteractionTimerCallback = nullptr;
static const double kCursorLoadingTimeout = 1000; // ms
MOZ_RUNINIT static AutoWeakFrame gLastCursorSourceFrame;
static TimeStamp gLastCursorUpdateTime;
static TimeStamp gTypingStartTime;
static TimeStamp gTypingEndTime;
static int32_t gTypingInteractionKeyPresses = 0;
MOZ_RUNINIT static dom::InteractionData gTypingInteraction = {};
static inline int32_t RoundDown(double aDouble) {
return (aDouble > 0) ? static_cast<int32_t>(floor(aDouble))
: static_cast<int32_t>(ceil(aDouble));
}
static bool IsSelectingLink(nsIFrame* aTargetFrame) {
if (!aTargetFrame) {
return false;
}
const nsFrameSelection* frameSel = aTargetFrame->GetConstFrameSelection();
if (!frameSel || !frameSel->GetDragState()) {
return false;
}
if (!nsContentUtils::GetClosestLinkInFlatTree(aTargetFrame->GetContent())) {
return false;
}
return true;
}
static UniquePtr<WidgetMouseEvent> CreateMouseOrPointerWidgetEvent(
WidgetMouseEvent* aMouseEvent, EventMessage aMessage,
EventTarget* aRelatedTarget);
/**
* Returns the common ancestor for mouseup purpose, given the
* current mouseup target and the previous mousedown target.
*/
static nsINode* GetCommonAncestorForMouseUp(
nsINode* aCurrentMouseUpTarget, nsINode* aLastMouseDownTarget,
Maybe<FormControlType>& aLastMouseDownInputControlType) {
if (!aCurrentMouseUpTarget || !aLastMouseDownTarget) {
return nullptr;
}
if (aCurrentMouseUpTarget == aLastMouseDownTarget) {
return aCurrentMouseUpTarget;
}
// Build the chain of parents
AutoTArray<nsINode*, 30> parents1;
do {
parents1.AppendElement(aCurrentMouseUpTarget);
aCurrentMouseUpTarget = aCurrentMouseUpTarget->GetFlattenedTreeParentNode();
} while (aCurrentMouseUpTarget);
AutoTArray<nsINode*, 30> parents2;
do {
parents2.AppendElement(aLastMouseDownTarget);
if (aLastMouseDownTarget == parents1.LastElement()) {
break;
}
aLastMouseDownTarget = aLastMouseDownTarget->GetFlattenedTreeParentNode();
} while (aLastMouseDownTarget);
// Find where the parent chain differs
uint32_t pos1 = parents1.Length();
uint32_t pos2 = parents2.Length();
nsINode* parent = nullptr;
for (uint32_t len = std::min(pos1, pos2); len > 0; --len) {
nsINode* child1 = parents1.ElementAt(--pos1);
nsINode* child2 = parents2.ElementAt(--pos2);
if (child1 != child2) {
break;
}
// If the input control type is different between mouseup and mousedown,
// this is not a valid click.
if (HTMLInputElement* input = HTMLInputElement::FromNodeOrNull(child1)) {
if (aLastMouseDownInputControlType.isSome() &&
aLastMouseDownInputControlType.ref() != input->ControlType()) {
break;
}
}
parent = child1;
}
return parent;
}
static bool HasNativeKeyBindings(nsIContent* aContent,
WidgetKeyboardEvent* aEvent) {
MOZ_ASSERT(aEvent->mMessage == eKeyPress);
if (!aContent) {
return false;
}
const RefPtr<dom::Element> targetElement = aContent->AsElement();
if (!targetElement) {
return false;
}
const auto type = [&]() -> Maybe<NativeKeyBindingsType> {
if (BrowserParent::GetFrom(targetElement)) {
const nsCOMPtr<nsIWidget> widget = aEvent->mWidget;
if (MOZ_UNLIKELY(!widget)) {
return Nothing();
}
widget::InputContext context = widget->GetInputContext();
return context.mIMEState.IsEditable()
? Some(context.GetNativeKeyBindingsType())
: Nothing();
}
const auto* const textControlElement =
TextControlElement::FromNode(targetElement);
if (textControlElement &&
textControlElement->IsSingleLineTextControlOrTextArea() &&
!textControlElement->IsInDesignMode()) {
return textControlElement->IsTextArea()
? Some(NativeKeyBindingsType::MultiLineEditor)
: Some(NativeKeyBindingsType::SingleLineEditor);
}
return targetElement->IsEditable()
? Some(NativeKeyBindingsType::RichTextEditor)
: Nothing();
}();
if (type.isNothing()) {
return false;
}
const nsTArray<CommandInt>& commands =
aEvent->EditCommandsConstRef(type.value());
return !commands.IsEmpty();
}
LazyLogModule sMouseBoundaryLog("MouseBoundaryEvents");
LazyLogModule sPointerBoundaryLog("PointerBoundaryEvents");
/******************************************************************/
/* mozilla::UITimerCallback */
/******************************************************************/
class UITimerCallback final : public nsITimerCallback, public nsINamed {
public:
UITimerCallback() : mPreviousCount(0) {}
NS_DECL_ISUPPORTS
NS_DECL_NSITIMERCALLBACK
NS_DECL_NSINAMED
private:
~UITimerCallback() = default;
uint32_t mPreviousCount;
};
NS_IMPL_ISUPPORTS(UITimerCallback, nsITimerCallback, nsINamed)
// If aTimer is nullptr, this method always sends "user-interaction-inactive"
// notification.
NS_IMETHODIMP
UITimerCallback::Notify(nsITimer* aTimer) {
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (!obs) return NS_ERROR_FAILURE;
if ((gMouseOrKeyboardEventCounter == mPreviousCount) || !aTimer) {
gMouseOrKeyboardEventCounter = 0;
obs->NotifyObservers(nullptr, "user-interaction-inactive", nullptr);
if (gUserInteractionTimer) {
gUserInteractionTimer->Cancel();
NS_RELEASE(gUserInteractionTimer);
}
} else {
obs->NotifyObservers(nullptr, "user-interaction-active", nullptr);
EventStateManager::UpdateUserActivityTimer();
if (XRE_IsParentProcess()) {
hal::BatteryInformation batteryInfo;
hal::GetCurrentBatteryInformation(&batteryInfo);
glean::power_battery::percentage_when_user_active.AccumulateSingleSample(
uint64_t(batteryInfo.level() * 100));
}
}
mPreviousCount = gMouseOrKeyboardEventCounter;
return NS_OK;
}
NS_IMETHODIMP
UITimerCallback::GetName(nsACString& aName) {
aName.AssignLiteral("UITimerCallback_timer");
return NS_OK;
}
/******************************************************************/
/* mozilla::OverOutElementsWrapper */
/******************************************************************/
NS_IMPL_CYCLE_COLLECTION(OverOutElementsWrapper, mDeepestEnterEventTarget,
mDispatchingOverEventTarget,
mDispatchingOutOrDeepestLeaveEventTarget)
NS_IMPL_CYCLE_COLLECTING_ADDREF(OverOutElementsWrapper)
NS_IMPL_CYCLE_COLLECTING_RELEASE(OverOutElementsWrapper)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(OverOutElementsWrapper)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
already_AddRefed<nsIWidget> OverOutElementsWrapper::GetLastOverWidget() const {
nsCOMPtr<nsIWidget> widget = do_QueryReferent(mLastOverWidget);
return widget.forget();
}
void OverOutElementsWrapper::ContentRemoved(nsIContent& aContent) {
if (!mDeepestEnterEventTarget) {
return;
}
if (!nsContentUtils::ContentIsFlattenedTreeDescendantOf(
mDeepestEnterEventTarget, &aContent)) {
return;
}
LogModule* const logModule = mType == BoundaryEventType::Mouse
? sMouseBoundaryLog
: sPointerBoundaryLog;
if (mDispatchingOverEventTarget &&
(mDeepestEnterEventTarget == mDispatchingOverEventTarget ||
nsContentUtils::ContentIsFlattenedTreeDescendantOf(
mDispatchingOverEventTarget, &aContent))) {
if (mDispatchingOverEventTarget ==
mDispatchingOutOrDeepestLeaveEventTarget) {
MOZ_LOG(logModule, LogLevel::Info,
("The dispatching \"%s\" event target (%p) is removed",
LastOverEventTargetIsOutEventTarget() ? "out" : "leave",
mDispatchingOutOrDeepestLeaveEventTarget.get()));
mDispatchingOutOrDeepestLeaveEventTarget = nullptr;
}
MOZ_LOG(logModule, LogLevel::Info,
("The dispatching \"over\" event target (%p) is removed",
mDispatchingOverEventTarget.get()));
mDispatchingOverEventTarget = nullptr;
}
if (mDispatchingOutOrDeepestLeaveEventTarget &&
(mDeepestEnterEventTarget == mDispatchingOutOrDeepestLeaveEventTarget ||
nsContentUtils::ContentIsFlattenedTreeDescendantOf(
mDispatchingOutOrDeepestLeaveEventTarget, &aContent))) {
MOZ_LOG(logModule, LogLevel::Info,
("The dispatching \"%s\" event target (%p) is removed",
LastOverEventTargetIsOutEventTarget() ? "out" : "leave",
mDispatchingOutOrDeepestLeaveEventTarget.get()));
mDispatchingOutOrDeepestLeaveEventTarget = nullptr;
}
MOZ_LOG(logModule, LogLevel::Info,
("The last \"%s\" event target (%p) is removed and now the last "
"deepest enter target becomes %s(%p)",
LastOverEventTargetIsOutEventTarget() ? "over" : "enter",
mDeepestEnterEventTarget.get(),
aContent.GetFlattenedTreeParent()
? ToString(*aContent.GetFlattenedTreeParent()).c_str()
: "nullptr",
aContent.GetFlattenedTreeParent()));
UpdateDeepestEnterEventTarget(aContent.GetFlattenedTreeParent());
}
void OverOutElementsWrapper::TryToRestorePendingRemovedOverTarget(
const WidgetEvent* aEvent) {
if (!MaybeHasPendingRemovingOverEventTarget()) {
return;
}
LogModule* const logModule = mType == BoundaryEventType::Mouse
? sMouseBoundaryLog
: sPointerBoundaryLog;
// If we receive a mouse event immediately, let's try to restore the last
// "over" event target as the following "out" event target. We assume that a
// synthesized mousemove or another mouse event is being dispatched at latest
// the next animation frame from the removal. However, synthesized mouse move
// which is enqueued by ContentRemoved() may not sent to this instance because
// the target is considered with the latest layout, so the document of this
// instance may be moved somewhere before the next animation frame.
// Therefore, we should not restore the last "over" target if we receive an
// unexpected event like a keyboard event, a wheel event, etc.
if (aEvent->AsMouseEvent()) {
// Restore the original "over" event target should be allowed only when it's
// reconnected under the last deepest "enter" event target because we need
// to dispatch "leave" events later at least on the ancestors which have
// never been removed from the tree.
// XXX If new ancestor is inserted between mDeepestEnterEventTarget and
// mPendingToRemoveLastOverEventTarget, we will dispatch "leave" event even
// though we have not dispatched "enter" event on the element. For fixing
// this, we need to store the full path of the last "out" event target when
// it's removed from the tree. I guess we can be relax for this issue
// because this hack is required for web apps which reconnect the target
// to the same position immediately.
// XXX Should be IsInclusiveFlatTreeDescendantOf()? However, it may
// be reconnected into a subtree which is different from where the
// last over element was.
nsCOMPtr<nsIContent> pendingRemovingOverEventTarget =
GetPendingRemovingOverEventTarget();
if (pendingRemovingOverEventTarget &&
pendingRemovingOverEventTarget->IsInclusiveDescendantOf(
mDeepestEnterEventTarget)) {
// StoreOverEventTargetAndDeepestEnterEventTarget() always resets
// mLastOverWidget. When we restore the pending removing "over" event
// target, we need to keep storing the original "over" widget too.
nsCOMPtr<nsIWeakReference> widget = std::move(mLastOverWidget);
StoreOverEventTargetAndDeepestEnterEventTarget(
pendingRemovingOverEventTarget);
mLastOverWidget = std::move(widget);
MOZ_LOG(logModule, LogLevel::Info,
("The \"over\" event target (%p) is restored",
mDeepestEnterEventTarget.get()));
return;
}
MOZ_LOG(logModule, LogLevel::Debug,
("Forgetting the last \"over\" event target (%p) because it is not "
"reconnected under the deepest enter event target (%p)",
mPendingRemovingOverEventTarget.get(),
mDeepestEnterEventTarget.get()));
} else {
MOZ_LOG(logModule, LogLevel::Debug,
("Forgetting the last \"over\" event target (%p) because an "
"unexpected event (%s) is being dispatched, that means that "
"EventStateManager didn't receive a synthesized mousemove which "
"should be dispatched at next animation frame from the removal",
mPendingRemovingOverEventTarget.get(), ToChar(aEvent->mMessage)));
}
// Now, we should not restore mPendingRemovingOverEventTarget to
// mDeepestEnterEventTarget anymore since mPendingRemovingOverEventTarget was
// moved outside the subtree of mDeepestEnterEventTarget.
mPendingRemovingOverEventTarget = nullptr;
}
void OverOutElementsWrapper::WillDispatchOverAndEnterEvent(
nsIContent* aOverEventTarget) {
StoreOverEventTargetAndDeepestEnterEventTarget(aOverEventTarget);
// Store the first "over" event target we fire and don't refire "over" event
// to that element while the first "over" event is still ongoing.
mDispatchingOverEventTarget = aOverEventTarget;
}
void OverOutElementsWrapper::DidDispatchOverAndEnterEvent(
nsIContent* aOriginalOverTargetInComposedDoc,
nsIWidget* aOverEventTargetWidget) {
mDispatchingOverEventTarget = nullptr;
mLastOverWidget = do_GetWeakReference(aOverEventTargetWidget);
// Pointer Events define that once the `pointerover` event target is removed
// from the tree, `pointerout` should not be fired on that and the closest
// connected ancestor at the target removal should be kept as the deepest
// `pointerleave` target. Therefore, we don't need the special handling for
// `pointerout` event target if the last `pointerover` target is temporarily
// removed from the tree.
if (mType == OverOutElementsWrapper::BoundaryEventType::Pointer) {
return;
}
// Assume that the caller checks whether aOriginalOverTarget is in the
// original document. If we don't enable the strict mouse/pointer event
// boundary event dispatching by the pref (see below),
// mDeepestEnterEventTarget is set to nullptr when the last "over" target is
// removed. Therefore, we cannot check whether aOriginalOverTarget is in the
// original document here.
if (!aOriginalOverTargetInComposedDoc) {
return;
}
MOZ_ASSERT_IF(mDeepestEnterEventTarget,
mDeepestEnterEventTarget->GetComposedDoc() ==
aOriginalOverTargetInComposedDoc->GetComposedDoc());
// If the "mouseover" event target is removed temporarily while we're
// dispatching "mouseover" and "mouseenter" events and the target gets back
// under the deepest enter event target, we should restore the "mouseover"
// target.
if (!LastOverEventTargetIsOutEventTarget() && mDeepestEnterEventTarget &&
nsContentUtils::ContentIsFlattenedTreeDescendantOf(
aOriginalOverTargetInComposedDoc, mDeepestEnterEventTarget)) {
StoreOverEventTargetAndDeepestEnterEventTarget(
aOriginalOverTargetInComposedDoc);
LogModule* const logModule = mType == BoundaryEventType::Mouse
? sMouseBoundaryLog
: sPointerBoundaryLog;
MOZ_LOG(logModule, LogLevel::Info,
("The \"over\" event target (%p) is restored",
mDeepestEnterEventTarget.get()));
}
}
void OverOutElementsWrapper::StoreOverEventTargetAndDeepestEnterEventTarget(
nsIContent* aOverEventTargetAndDeepestEnterEventTarget) {
mDeepestEnterEventTarget = aOverEventTargetAndDeepestEnterEventTarget;
mPendingRemovingOverEventTarget = nullptr;
mDeepestEnterEventTargetIsOverEventTarget = !!mDeepestEnterEventTarget;
mLastOverWidget = nullptr; // Set it after dispatching the "over" event.
}
void OverOutElementsWrapper::UpdateDeepestEnterEventTarget(
nsIContent* aDeepestEnterEventTarget) {
if (MOZ_UNLIKELY(mDeepestEnterEventTarget == aDeepestEnterEventTarget)) {
return;
}
if (!aDeepestEnterEventTarget) {
// If the root element is removed, we don't need to dispatch "leave"
// events on any elements. Therefore, we can forget everything.
StoreOverEventTargetAndDeepestEnterEventTarget(nullptr);
return;
}
if (LastOverEventTargetIsOutEventTarget()) {
MOZ_ASSERT(mDeepestEnterEventTarget);
if (mType == BoundaryEventType::Pointer) {
// The spec of Pointer Events defines that once the `pointerover` event
// target is removed from the tree, `pointerout` should not be fired on
// that and the closest connected ancestor at the target removal should be
// kept as the deepest `pointerleave` target. All browsers considers the
// last `pointerover` event target is removed immediately when it occurs.
// Therefore, we don't need the special handling which we do for the
// `mouseout` event target below for considering whether we'll dispatch
// `pointerout` on the last `pointerover` target.
mPendingRemovingOverEventTarget = nullptr;
} else {
// Now, the `mouseout` event target is removed from the DOM at least
// temporarily. Let's keep storing it for restoring it if it's
// reconnected into mDeepestEnterEventTarget in a tick because the other
// browsers do not treat temporary removal of the last `mouseover` target
// keeps storing it as the next `mouseout` event target.
MOZ_ASSERT(!mPendingRemovingOverEventTarget);
MOZ_ASSERT(mDeepestEnterEventTarget);
mPendingRemovingOverEventTarget =
do_GetWeakReference(mDeepestEnterEventTarget);
}
} else {
MOZ_ASSERT(!mDeepestEnterEventTargetIsOverEventTarget);
// If mDeepestEnterEventTarget is not the last "over" event target, we've
// already done the complicated state managing above. Therefore, we only
// need to update mDeepestEnterEventTarget in this case.
}
mDeepestEnterEventTarget = aDeepestEnterEventTarget;
mDeepestEnterEventTargetIsOverEventTarget = false;
// Do not update mLastOverWidget here because it's required to ignore some
// following pointer events which are fired on widget under different top
// level widget.
}
/******************************************************************/
/* mozilla::EventStateManager */
/******************************************************************/
static uint32_t sESMInstanceCount = 0;
bool EventStateManager::sNormalLMouseEventInProcess = false;
int16_t EventStateManager::sCurrentMouseBtn = MouseButton::eNotPressed;
EventStateManager* EventStateManager::sActiveESM = nullptr;
EventStateManager* EventStateManager::sCursorSettingManager = nullptr;
MOZ_RUNINIT AutoWeakFrame EventStateManager::sLastDragOverFrame = nullptr;
LayoutDeviceIntPoint EventStateManager::sPreLockScreenPoint =
LayoutDeviceIntPoint(0, 0);
LayoutDeviceIntPoint EventStateManager::sLastRefPoint = kInvalidRefPoint;
CSSIntPoint EventStateManager::sLastScreenPoint = CSSIntPoint(0, 0);
LayoutDeviceIntPoint EventStateManager::sSynthCenteringPoint = kInvalidRefPoint;
CSSIntPoint EventStateManager::sLastClientPoint = CSSIntPoint(0, 0);
MOZ_RUNINIT nsCOMPtr<nsIContent> EventStateManager::sDragOverContent = nullptr;
EventStateManager::WheelPrefs* EventStateManager::WheelPrefs::sInstance =
nullptr;
EventStateManager::DeltaAccumulator*
EventStateManager::DeltaAccumulator::sInstance = nullptr;
constexpr const StyleCursorKind kInvalidCursorKind =
static_cast<StyleCursorKind>(255);
EventStateManager::EventStateManager()
: mLockCursor(kInvalidCursorKind),
mCurrentTarget(nullptr),
// init d&d gesture state machine variables
mGestureDownPoint(0, 0),
mGestureModifiers(0),
mGestureDownButtons(0),
mGestureDownButton(0),
mPresContext(nullptr),
mShouldAlwaysUseLineDeltas(false),
mShouldAlwaysUseLineDeltasInitialized(false),
mGestureDownInTextControl(false),
mInTouchDrag(false),
m_haveShutdown(false) {
if (sESMInstanceCount == 0) {
gUserInteractionTimerCallback = new UITimerCallback();
if (gUserInteractionTimerCallback) NS_ADDREF(gUserInteractionTimerCallback);
UpdateUserActivityTimer();
}
++sESMInstanceCount;
}
nsresult EventStateManager::UpdateUserActivityTimer() {
if (!gUserInteractionTimerCallback) return NS_OK;
if (!gUserInteractionTimer) {
gUserInteractionTimer = NS_NewTimer().take();
}
if (gUserInteractionTimer) {
gUserInteractionTimer->InitWithCallback(
gUserInteractionTimerCallback,
StaticPrefs::dom_events_user_interaction_interval(),
nsITimer::TYPE_ONE_SHOT);
}
return NS_OK;
}
nsresult EventStateManager::Init() {
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (!observerService) return NS_ERROR_FAILURE;
observerService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, true);
return NS_OK;
}
bool EventStateManager::ShouldAlwaysUseLineDeltas() {
if (MOZ_UNLIKELY(!mShouldAlwaysUseLineDeltasInitialized)) {
mShouldAlwaysUseLineDeltasInitialized = true;
mShouldAlwaysUseLineDeltas =
!StaticPrefs::dom_event_wheel_deltaMode_lines_disabled();
if (!mShouldAlwaysUseLineDeltas && mDocument) {
if (nsIPrincipal* principal =
mDocument->GetPrincipalForPrefBasedHacks()) {
mShouldAlwaysUseLineDeltas = principal->IsURIInPrefList(
"dom.event.wheel-deltaMode-lines.always-enabled");
}
}
}
return mShouldAlwaysUseLineDeltas;
}
EventStateManager::~EventStateManager() {
ReleaseCurrentIMEContentObserver();
if (sActiveESM == this) {
sActiveESM = nullptr;
}
if (StaticPrefs::ui_click_hold_context_menus()) {
KillClickHoldTimer();
}
if (sCursorSettingManager == this) {
sCursorSettingManager = nullptr;
}
--sESMInstanceCount;
if (sESMInstanceCount == 0) {
WheelTransaction::Shutdown();
if (gUserInteractionTimerCallback) {
gUserInteractionTimerCallback->Notify(nullptr);
NS_RELEASE(gUserInteractionTimerCallback);
}
if (gUserInteractionTimer) {
gUserInteractionTimer->Cancel();
NS_RELEASE(gUserInteractionTimer);
}
WheelPrefs::Shutdown();
DeltaAccumulator::Shutdown();
}
if (sDragOverContent && sDragOverContent->OwnerDoc() == mDocument) {
sDragOverContent = nullptr;
}
if (!m_haveShutdown) {
Shutdown();
// Don't remove from Observer service in Shutdown because Shutdown also
// gets called from xpcom shutdown observer. And we don't want to remove
// from the service in that case.
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
}
}
}
nsresult EventStateManager::Shutdown() {
m_haveShutdown = true;
return NS_OK;
}
NS_IMETHODIMP
EventStateManager::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* someData) {
if (!nsCRT::strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
Shutdown();
}
return NS_OK;
}
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(EventStateManager)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIObserver)
NS_INTERFACE_MAP_ENTRY(nsIObserver)
NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(EventStateManager)
NS_IMPL_CYCLE_COLLECTING_RELEASE(EventStateManager)
NS_IMPL_CYCLE_COLLECTION_WEAK(EventStateManager, mCurrentTargetContent,
mGestureDownContent, mGestureDownFrameOwner,
mLastLeftMouseDownInfo.mLastMouseDownContent,
mLastMiddleMouseDownInfo.mLastMouseDownContent,
mLastRightMouseDownInfo.mLastMouseDownContent,
mActiveContent, mHoverContent, mURLTargetContent,
mPopoverPointerDownTarget, mMouseEnterLeaveHelper,
mPointersEnterLeaveHelper, mDocument,
mIMEContentObserver, mAccessKeys)
void EventStateManager::ReleaseCurrentIMEContentObserver() {
if (mIMEContentObserver) {
mIMEContentObserver->DisconnectFromEventStateManager();
}
mIMEContentObserver = nullptr;
}
void EventStateManager::OnStartToObserveContent(
IMEContentObserver* aIMEContentObserver) {
if (mIMEContentObserver == aIMEContentObserver) {
return;
}
ReleaseCurrentIMEContentObserver();
mIMEContentObserver = aIMEContentObserver;
}
void EventStateManager::OnStopObservingContent(
IMEContentObserver* aIMEContentObserver) {
aIMEContentObserver->DisconnectFromEventStateManager();
NS_ENSURE_TRUE_VOID(mIMEContentObserver == aIMEContentObserver);
mIMEContentObserver = nullptr;
}
void EventStateManager::TryToFlushPendingNotificationsToIME() {
if (mIMEContentObserver) {
mIMEContentObserver->TryToFlushPendingNotifications(true);
}
}
static bool IsMessageMouseUserActivity(EventMessage aMessage) {
return aMessage == eMouseMove || aMessage == eMouseUp ||
aMessage == eMouseDown || aMessage == ePointerAuxClick ||
aMessage == eMouseDoubleClick || aMessage == ePointerClick ||
aMessage == eMouseActivate || aMessage == eMouseLongTap;
}
static bool IsMessageGamepadUserActivity(EventMessage aMessage) {
return aMessage == eGamepadButtonDown || aMessage == eGamepadButtonUp ||
aMessage == eGamepadAxisMove;
}
// static
bool EventStateManager::IsKeyboardEventUserActivity(WidgetEvent* aEvent) {
// We ignore things that shouldn't cause popups, but also things that look
// like shortcut presses. In some obscure cases these may actually be
// website input, but any meaningful website will have other input anyway,
// and we can't very well tell whether shortcut input was supposed to be
// directed at chrome or the document.
WidgetKeyboardEvent* keyEvent = aEvent->AsKeyboardEvent();
// Access keys should be treated as page interaction.
if (keyEvent->ModifiersMatchWithAccessKey(AccessKeyType::eContent)) {
return true;
}
if (!keyEvent->CanTreatAsUserInput() || keyEvent->IsControl() ||
keyEvent->IsMeta() || keyEvent->IsAlt()) {
return false;
}
// Deal with function keys:
switch (keyEvent->mKeyNameIndex) {
case KEY_NAME_INDEX_F1:
case KEY_NAME_INDEX_F2:
case KEY_NAME_INDEX_F3:
case KEY_NAME_INDEX_F4:
case KEY_NAME_INDEX_F5:
case KEY_NAME_INDEX_F6:
case KEY_NAME_INDEX_F7:
case KEY_NAME_INDEX_F8:
case KEY_NAME_INDEX_F9:
case KEY_NAME_INDEX_F10:
case KEY_NAME_INDEX_F11:
case KEY_NAME_INDEX_F12:
case KEY_NAME_INDEX_F13:
case KEY_NAME_INDEX_F14:
case KEY_NAME_INDEX_F15:
case KEY_NAME_INDEX_F16:
case KEY_NAME_INDEX_F17:
case KEY_NAME_INDEX_F18:
case KEY_NAME_INDEX_F19:
case KEY_NAME_INDEX_F20:
case KEY_NAME_INDEX_F21:
case KEY_NAME_INDEX_F22:
case KEY_NAME_INDEX_F23:
case KEY_NAME_INDEX_F24:
return false;
default:
return true;
}
}
static void OnTypingInteractionEnded() {
// We don't consider a single keystroke to be typing.
if (gTypingInteractionKeyPresses > 1) {
gTypingInteraction.mInteractionCount += gTypingInteractionKeyPresses;
gTypingInteraction.mInteractionTimeInMilliseconds += static_cast<uint32_t>(
std::ceil((gTypingEndTime - gTypingStartTime).ToMilliseconds()));
}
gTypingInteractionKeyPresses = 0;
gTypingStartTime = TimeStamp();
gTypingEndTime = TimeStamp();
}
static void HandleKeyUpInteraction(WidgetKeyboardEvent* aKeyEvent) {
if (EventStateManager::IsKeyboardEventUserActivity(aKeyEvent)) {
TimeStamp now = TimeStamp::Now();
if (gTypingEndTime.IsNull()) {
gTypingEndTime = now;
}
TimeDuration delay = now - gTypingEndTime;
// Has it been too long since the last keystroke to be considered typing?
if (gTypingInteractionKeyPresses > 0 &&
delay >
TimeDuration::FromMilliseconds(
StaticPrefs::browser_places_interactions_typing_timeout_ms())) {
OnTypingInteractionEnded();
}
gTypingInteractionKeyPresses++;
if (gTypingStartTime.IsNull()) {
gTypingStartTime = now;
}
gTypingEndTime = now;
}
}
nsresult EventStateManager::PreHandleEvent(nsPresContext* aPresContext,
WidgetEvent* aEvent,
nsIFrame* aTargetFrame,
nsIContent* aTargetContent,
nsEventStatus* aStatus,
nsIContent* aOverrideClickTarget) {
AUTO_PROFILER_LABEL("EventStateManager::PreHandleEvent", DOM);
NS_ENSURE_ARG_POINTER(aStatus);
NS_ENSURE_ARG(aPresContext);
if (!aEvent) {
NS_ERROR("aEvent is null. This should never happen.");
return NS_ERROR_NULL_POINTER;
}
NS_WARNING_ASSERTION(
!aTargetFrame || !aTargetFrame->GetContent() ||
aTargetFrame->GetContent() == aTargetContent ||
aTargetFrame->GetContent()->GetFlattenedTreeParent() ==
aTargetContent ||
aTargetFrame->IsGeneratedContentFrame(),
"aTargetFrame should be related with aTargetContent");
#if DEBUG
if (aTargetFrame && aTargetFrame->IsGeneratedContentFrame()) {
MOZ_ASSERT(aTargetContent == aTargetFrame->GetContentForEvent(aEvent),
"Unexpected target for generated content frame!");
}
#endif
mCurrentTarget = aTargetFrame;
mCurrentTargetContent = nullptr;
// Do not take account eMouseEnterIntoWidget/ExitFromWidget so that loading
// a page when user is not active doesn't change the state to active.
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
if (aEvent->IsTrusted() &&
((mouseEvent && mouseEvent->IsReal() &&
IsMessageMouseUserActivity(mouseEvent->mMessage)) ||
aEvent->mClass == eWheelEventClass ||
aEvent->mClass == ePointerEventClass ||
aEvent->mClass == eTouchEventClass ||
aEvent->mClass == eKeyboardEventClass ||
(aEvent->mClass == eDragEventClass && aEvent->mMessage == eDrop) ||
IsMessageGamepadUserActivity(aEvent->mMessage))) {
if (gMouseOrKeyboardEventCounter == 0) {
nsCOMPtr<nsIObserverService> obs =
mozilla::services::GetObserverService();
if (obs) {
obs->NotifyObservers(nullptr, "user-interaction-active", nullptr);
UpdateUserActivityTimer();
}
}
++gMouseOrKeyboardEventCounter;
nsCOMPtr<nsINode> node = aTargetContent;
if (node &&
((aEvent->mMessage == eKeyUp && IsKeyboardEventUserActivity(aEvent)) ||
aEvent->mMessage == eMouseUp || aEvent->mMessage == eWheel ||
aEvent->mMessage == eTouchEnd || aEvent->mMessage == ePointerUp ||
aEvent->mMessage == eDrop)) {
Document* doc = node->OwnerDoc();
while (doc) {
doc->SetUserHasInteracted();
doc = nsContentUtils::IsChildOfSameType(doc)
? doc->GetInProcessParentDocument()
: nullptr;
}
}
}
WheelTransaction::OnEvent(aEvent);
// Focus events don't necessarily need a frame.
if (!mCurrentTarget && !aTargetContent) {
NS_ERROR("mCurrentTarget and aTargetContent are null");
return NS_ERROR_NULL_POINTER;
}
#ifdef DEBUG
if (aEvent->HasDragEventMessage() && PointerLockManager::IsLocked()) {
NS_ASSERTION(PointerLockManager::IsLocked(),
"Pointer is locked. Drag events should be suppressed when "
"the pointer is locked.");
}
#endif
// Store last known screenPoint and clientPoint so pointer lock
// can use these values as constants.
if (aEvent->IsTrusted() &&
((mouseEvent && mouseEvent->IsReal()) ||
aEvent->mClass == eWheelEventClass) &&
!PointerLockManager::IsLocked()) {
// XXX Probably doesn't matter much, but storing these in CSS pixels instead
// of device pixels means behavior can be a bit odd if you zoom while
// pointer-locked.
sLastScreenPoint = RoundedToInt(
Event::GetScreenCoords(aPresContext, aEvent, aEvent->mRefPoint)
.extract());
sLastClientPoint = RoundedToInt(Event::GetClientCoords(
aPresContext, aEvent, aEvent->mRefPoint, CSSDoublePoint{0, 0}));
}
*aStatus = nsEventStatus_eIgnore;
if (aEvent->mClass == eQueryContentEventClass) {
HandleQueryContentEvent(aEvent->AsQueryContentEvent());
return NS_OK;
}
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
if (touchEvent && mInTouchDrag) {
if (touchEvent->mMessage == eTouchMove) {
GenerateDragGesture(aPresContext, touchEvent);
} else {
mInTouchDrag = false;
StopTrackingDragGesture(true);
}
}
if (mMouseEnterLeaveHelper && aEvent->IsTrusted()) {
// When the last `mouseover` event target is removed from the document,
// we makes mMouseEnterLeaveHelper update the last deepest `mouseenter`
// event target to the removed node parent and mark it as not the following
// `mouseout` event target. However, the other browsers may dispatch
// `mouseout` on it if it's restored "immediately". Therefore, we use
// the next animation frame as the deadline. ContentRemoved() enqueues a
// synthesized `mousemove` to dispatch mouse boundary events under the
// mouse cursor soon and the synthesized event (or eMouseExitFromWidget if
// our window is moved) will reach here at latest the next animation frame.
// Therefore, we can use the event as the deadline. If the removed last
// `mouseover` target is reconnected before a synthesized mouse event or
// a real mouse event, let's restore it as the following `mouseout` event
// target. Otherwise, e.g., a keyboard event, let's forget it.
mMouseEnterLeaveHelper->TryToRestorePendingRemovedOverTarget(aEvent);
}
static constexpr auto const allowSynthesisForTests = []() -> bool {
nsCOMPtr<nsIDragService> dragService =
do_GetService("@mozilla.org/widget/dragservice;1");
return dragService &&
!dragService->GetNeverAllowSessionIsSynthesizedForTests();
};
switch (aEvent->mMessage) {
case eContextMenu:
if (PointerLockManager::IsLocked()) {
return NS_ERROR_DOM_INVALID_STATE_ERR;
}
break;
case eMouseTouchDrag:
mInTouchDrag = true;
BeginTrackingDragGesture(aPresContext, mouseEvent, aTargetFrame);
break;
case eMouseDown: {
switch (mouseEvent->mButton) {
case MouseButton::ePrimary:
BeginTrackingDragGesture(aPresContext, mouseEvent, aTargetFrame);
mLastLeftMouseDownInfo.mClickCount = mouseEvent->mClickCount;
SetClickCount(mouseEvent, aStatus);
sNormalLMouseEventInProcess = true;
break;
case MouseButton::eMiddle:
mLastMiddleMouseDownInfo.mClickCount = mouseEvent->mClickCount;
SetClickCount(mouseEvent, aStatus);
break;
case MouseButton::eSecondary:
mLastRightMouseDownInfo.mClickCount = mouseEvent->mClickCount;
SetClickCount(mouseEvent, aStatus);
break;
}
break;
}
case eMouseUp: {
switch (mouseEvent->mButton) {
case MouseButton::ePrimary:
if (StaticPrefs::ui_click_hold_context_menus()) {
KillClickHoldTimer();
}
mInTouchDrag = false;
StopTrackingDragGesture(true);
sNormalLMouseEventInProcess = false;
// then fall through...
[[fallthrough]];
case MouseButton::eSecondary:
case MouseButton::eMiddle:
RefPtr<EventStateManager> esm =
ESMFromContentOrThis(aOverrideClickTarget);
esm->SetClickCount(mouseEvent, aStatus, aOverrideClickTarget);
break;
}
break;
}
case eMouseEnterIntoWidget:
PointerEventHandler::UpdateActivePointerState(mouseEvent, aTargetContent);
// In some cases on e10s eMouseEnterIntoWidget
// event was sent twice into child process of content.
// (From specific widget code (sending is not permanent) and
// from ESM::DispatchMouseOrPointerBoundaryEvent (sending is permanent)).
// IsCrossProcessForwardingStopped() helps to suppress sending accidental
// event from widget code.
aEvent->StopCrossProcessForwarding();
break;
case eMouseExitFromWidget:
// If this is a remote frame, we receive eMouseExitFromWidget from the
// parent the mouse exits our content. Since the parent may update the
// cursor while the mouse is outside our frame, and since PuppetWidget
// caches the current cursor internally, re-entering our content (say from
// over a window edge) wont update the cursor if the cached value and the
// current cursor match. So when the mouse exits a remote frame, clear the
// cached widget cursor so a proper update will occur when the mouse
// re-enters.
if (XRE_IsContentProcess()) {
ClearCachedWidgetCursor(mCurrentTarget);
}
// IsCrossProcessForwardingStopped() helps to suppress double event
// sending into process of content. For more information see comment
// above, at eMouseEnterIntoWidget case.
aEvent->StopCrossProcessForwarding();
// If the event is not a top-level window or puppet widget exit, then it's
// not really an exit --- we may have traversed widget boundaries but
// we're still in our toplevel window or puppet widget.
if (mouseEvent->mExitFrom.value() !=
WidgetMouseEvent::ePlatformTopLevel &&
mouseEvent->mExitFrom.value() != WidgetMouseEvent::ePuppet) {
// Treat it as a synthetic move so we don't generate spurious
// "exit" or "move" events. Any necessary "out" or "over" events
// will be generated by GenerateMouseEnterExit
mouseEvent->mMessage = eMouseMove;
mouseEvent->mReason = WidgetMouseEvent::eSynthesized;
// then fall through...
} else {
MOZ_ASSERT_IF(XRE_IsParentProcess(),
mouseEvent->mExitFrom.value() ==
WidgetMouseEvent::ePlatformTopLevel);
MOZ_ASSERT_IF(XRE_IsContentProcess(), mouseEvent->mExitFrom.value() ==
WidgetMouseEvent::ePuppet);
// We should synthetize corresponding pointer events
GeneratePointerEnterExit(ePointerLeave, mouseEvent);
GenerateMouseEnterExit(mouseEvent);
// This is really an exit and should stop here
aEvent->mMessage = eVoidEvent;
break;
}
[[fallthrough]];
case ePointerDown:
if (aEvent->mMessage == ePointerDown) {
PointerEventHandler::UpdateActivePointerState(mouseEvent,
aTargetContent);
PointerEventHandler::ImplicitlyCapturePointer(aTargetFrame, aEvent);
if (mouseEvent->mInputSource == MouseEvent_Binding::MOZ_SOURCE_MOUSE) {
NotifyTargetUserActivation(aEvent, aTargetContent);
}
LightDismissOpenPopovers(aEvent, aTargetContent);
}
[[fallthrough]];
case eMouseMove:
case ePointerMove: {
if (aEvent->mMessage == ePointerMove) {
PointerEventHandler::UpdateActivePointerState(mouseEvent,
aTargetContent);
}
if (!mInTouchDrag &&
PointerEventHandler::IsDragAndDropEnabled(*mouseEvent)) {
GenerateDragGesture(aPresContext, mouseEvent);
}
// on the Mac, GenerateDragGesture() may not return until the drag
// has completed and so |aTargetFrame| may have been deleted (moving
// a bookmark, for example). If this is the case, however, we know
// that ClearFrameRefs() has been called and it cleared out
// |mCurrentTarget|. As a result, we should pass |mCurrentTarget|
// into UpdateCursor().
UpdateCursor(aPresContext, mouseEvent, mCurrentTarget, aStatus);
UpdateLastRefPointOfMouseEvent(mouseEvent);
if (PointerLockManager::IsLocked()) {
ResetPointerToWindowCenterWhilePointerLocked(mouseEvent);
}
UpdateLastPointerPosition(mouseEvent);
GenerateMouseEnterExit(mouseEvent);
// Flush pending layout changes, so that later mouse move events
// will go to the right nodes.
FlushLayout(aPresContext);
break;
}
case ePointerUp:
LightDismissOpenPopovers(aEvent, aTargetContent);
GenerateMouseEnterExit(mouseEvent);
if (mouseEvent->mInputSource != MouseEvent_Binding::MOZ_SOURCE_MOUSE) {
NotifyTargetUserActivation(aEvent, aTargetContent);
}
break;
case ePointerGotCapture:
GenerateMouseEnterExit(mouseEvent);
break;
case eDragStart:
if (StaticPrefs::ui_click_hold_context_menus()) {
// an external drag gesture event came in, not generated internally
// by Gecko. Make sure we get rid of the click-hold timer.
KillClickHoldTimer();
}
break;
case eDragOver: {
WidgetDragEvent* dragEvent = aEvent->AsDragEvent();
MOZ_ASSERT(dragEvent);
if (dragEvent->mFlags.mIsSynthesizedForTests &&
allowSynthesisForTests()) {
dragEvent->InitDropEffectForTests();
}
// Send the enter/exit events before eDrop.
GenerateDragDropEnterExit(aPresContext, dragEvent);
break;
}
case eDrop: {
if (aEvent->mFlags.mIsSynthesizedForTests && allowSynthesisForTests()) {
MOZ_ASSERT(aEvent->AsDragEvent());
aEvent->AsDragEvent()->InitDropEffectForTests();
}
break;
}
case eKeyPress: {
WidgetKeyboardEvent* keyEvent = aEvent->AsKeyboardEvent();
if ((keyEvent->ModifiersMatchWithAccessKey(AccessKeyType::eChrome) ||
keyEvent->ModifiersMatchWithAccessKey(AccessKeyType::eContent)) &&
// If the key binding of this event is a native key binding, we
// prioritize it.
!HasNativeKeyBindings(aTargetContent, keyEvent)) {
// If the eKeyPress event will be sent to a remote process, this
// process needs to wait reply from the remote process for checking if
// preceding eKeyDown event is consumed. If preceding eKeyDown event
// is consumed in the remote process, BrowserChild won't send the event
// back to this process. So, only when this process receives a reply
// eKeyPress event in BrowserParent, we should handle accesskey in this
// process.
if (IsTopLevelRemoteTarget(GetFocusedElement())) {
// However, if there is no accesskey target for the key combination,
// we don't need to wait reply from the remote process. Otherwise,
// Mark the event as waiting reply from remote process and stop
// propagation in this process.
if (CheckIfEventMatchesAccessKey(keyEvent, aPresContext)) {
keyEvent->StopPropagation();
keyEvent->MarkAsWaitingReplyFromRemoteProcess();
}
}
// If the event target is in this process, we can handle accesskey now
// since if preceding eKeyDown event was consumed, eKeyPress event
// won't be dispatched by widget. So, coming eKeyPress event means
// that the preceding eKeyDown event wasn't consumed in this case.
else {
AutoTArray<uint32_t, 10> accessCharCodes;
keyEvent->GetAccessKeyCandidates(accessCharCodes);
if (HandleAccessKey(keyEvent, aPresContext, accessCharCodes)) {
*aStatus = nsEventStatus_eConsumeNoDefault;
}
}
}
}
// then fall through...
[[fallthrough]];
case eKeyDown:
if (aEvent->mMessage == eKeyDown) {
NotifyTargetUserActivation(aEvent, aTargetContent);
}
[[fallthrough]];
case eKeyUp: {
Element* element = GetFocusedElement();
if (element) {
mCurrentTargetContent = element;
}
// NOTE: Don't refer TextComposition::IsComposing() since UI Events
// defines that KeyboardEvent.isComposing is true when it's
// dispatched after compositionstart and compositionend.
// TextComposition::IsComposing() is false even before
// compositionend if there is no composing string.
// And also don't expose other document's composition state.
// A native IME context is typically shared by multiple documents.
// So, don't use GetTextCompositionFor(nsIWidget*) here.
RefPtr<TextComposition> composition =
IMEStateManager::GetTextCompositionFor(aPresContext);
aEvent->AsKeyboardEvent()->mIsComposing = !!composition;
// Widget may need to perform default action for specific keyboard
// event if it's not consumed. In this case, widget has already marked
// the event as "waiting reply from remote process". However, we need
// to reset it if the target (focused content) isn't in a remote process
// because PresShell needs to check if it's marked as so before
// dispatching events into the DOM tree.
if (aEvent->IsWaitingReplyFromRemoteProcess() &&
!aEvent->PropagationStopped() && !IsTopLevelRemoteTarget(element)) {
aEvent->ResetWaitingReplyFromRemoteProcessState();
}
} break;
case eWheel:
case eWheelOperationStart:
case eWheelOperationEnd: {
NS_ASSERTION(aEvent->IsTrusted(),
"Untrusted wheel event shouldn't be here");
using DeltaModeCheckingState = WidgetWheelEvent::DeltaModeCheckingState;
if (Element* element = GetFocusedElement()) {
mCurrentTargetContent = element;
}
if (aEvent->mMessage != eWheel) {
break;
}
WidgetWheelEvent* wheelEvent = aEvent->AsWheelEvent();
WheelPrefs::GetInstance()->ApplyUserPrefsToDelta(wheelEvent);
// If we won't dispatch a DOM event for this event, nothing to do anymore.
if (!wheelEvent->IsAllowedToDispatchDOMEvent()) {
break;
}
if (StaticPrefs::dom_event_wheel_deltaMode_lines_always_disabled()) {
wheelEvent->mDeltaModeCheckingState = DeltaModeCheckingState::Unchecked;
} else if (ShouldAlwaysUseLineDeltas()) {
wheelEvent->mDeltaModeCheckingState = DeltaModeCheckingState::Checked;
} else {
wheelEvent->mDeltaModeCheckingState = DeltaModeCheckingState::Unknown;
}
// Init lineOrPageDelta values for line scroll events for some devices
// on some platforms which might dispatch wheel events which don't
// have lineOrPageDelta values. And also, if delta values are
// customized by prefs, this recomputes them.
DeltaAccumulator::GetInstance()->InitLineOrPageDelta(aTargetFrame, this,
wheelEvent);
} break;
case eSetSelection: {
RefPtr<Element> focuedElement = GetFocusedElement();
IMEStateManager::HandleSelectionEvent(aPresContext, focuedElement,
aEvent->AsSelectionEvent());
break;
}
case eContentCommandCut:
case eContentCommandCopy:
case eContentCommandPaste:
case eContentCommandDelete:
case eContentCommandUndo:
case eContentCommandRedo:
case eContentCommandPasteTransferable:
case eContentCommandLookUpDictionary:
DoContentCommandEvent(aEvent->AsContentCommandEvent());
break;
case eContentCommandInsertText:
DoContentCommandInsertTextEvent(aEvent->AsContentCommandEvent());
break;
case eContentCommandReplaceText:
DoContentCommandReplaceTextEvent(aEvent->AsContentCommandEvent());
break;
case eContentCommandScroll:
DoContentCommandScrollEvent(aEvent->AsContentCommandEvent());
break;
case eCompositionStart:
if (aEvent->IsTrusted()) {
// If the event is trusted event, set the selected text to data of
// composition event.
WidgetCompositionEvent* compositionEvent = aEvent->AsCompositionEvent();
WidgetQueryContentEvent querySelectedTextEvent(
true, eQuerySelectedText, compositionEvent->mWidget);
HandleQueryContentEvent(&querySelectedTextEvent);
if (querySelectedTextEvent.FoundSelection()) {
compositionEvent->mData = querySelectedTextEvent.mReply->DataRef();
}
NS_ASSERTION(querySelectedTextEvent.Succeeded(),
"Failed to get selected text");
}
break;
case eTouchStart:
SetGestureDownPoint(aEvent->AsTouchEvent());
break;
default:
break;
}
return NS_OK;
}
// Returns true if this event is likely an user activation for a link or
// a link-like button, where modifier keys are likely be used for controlling
// where the link is opened.
//
// The modifiers associated with the user activation is used for controlling
// where the `window.open` is opened into.
static bool CanReflectModifiersToUserActivation(WidgetInputEvent* aEvent) {
MOZ_ASSERT(aEvent->mMessage == eKeyDown || aEvent->mMessage == ePointerDown ||
aEvent->mMessage == ePointerUp);
WidgetKeyboardEvent* keyEvent = aEvent->AsKeyboardEvent();
if (keyEvent) {
return keyEvent->CanReflectModifiersToUserActivation();
}
return true;
}
void EventStateManager::NotifyTargetUserActivation(WidgetEvent* aEvent,
nsIContent* aTargetContent) {
if (!aEvent->IsTrusted()) {
return;
}
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
if (mouseEvent && !mouseEvent->IsReal()) {
return;
}
nsCOMPtr<nsINode> node = aTargetContent;
if (!node) {
return;
}
Document* doc = node->OwnerDoc();
if (!doc) {
return;
}
// Don't gesture activate for key events for keys which are likely
// to be interaction with the browser, OS.
WidgetKeyboardEvent* keyEvent = aEvent->AsKeyboardEvent();
if (keyEvent && !keyEvent->CanUserGestureActivateTarget()) {
return;
}
// Touch gestures that end outside the drag target were touches that turned
// into scroll/pan/swipe actions. We don't want to gesture activate on such
// actions, we want to only gesture activate on touches that are taps.
// That is, touches that end in roughly the same place that they started.
if ((aEvent->mMessage == eTouchEnd ||
(aEvent->mMessage == ePointerUp &&
aEvent->AsPointerEvent()->mInputSource ==
MouseEvent_Binding::MOZ_SOURCE_TOUCH)) &&
IsEventOutsideDragThreshold(aEvent->AsInputEvent())) {
return;
}
// Do not treat the click on scrollbar as a user interaction with the web
// content.
if (StaticPrefs::dom_user_activation_ignore_scrollbars() &&
(aEvent->mMessage == ePointerDown || aEvent->mMessage == ePointerUp) &&
aTargetContent->IsInNativeAnonymousSubtree()) {
nsIContent* current = aTargetContent;
do {
nsIContent* root = current->GetClosestNativeAnonymousSubtreeRoot();
if (!root) {
break;
}
if (root->IsXULElement(nsGkAtoms::scrollbar)) {
return;
}
current = root->GetParent();
} while (current);
}
MOZ_ASSERT(aEvent->mMessage == eKeyDown || aEvent->mMessage == ePointerDown ||
aEvent->mMessage == ePointerUp);
UserActivation::Modifiers modifiers;
if (WidgetInputEvent* inputEvent = aEvent->AsInputEvent()) {
if (CanReflectModifiersToUserActivation(inputEvent)) {
if (inputEvent->IsShift()) {
modifiers.SetShift();
}
if (inputEvent->IsMeta()) {
modifiers.SetMeta();
}
if (inputEvent->IsControl()) {
modifiers.SetControl();
}
if (inputEvent->IsAlt()) {
modifiers.SetAlt();
}
WidgetMouseEvent* mouseEvent = inputEvent->AsMouseEvent();
if (mouseEvent) {
if (mouseEvent->mButton == MouseButton::eMiddle) {
modifiers.SetMiddleMouse();
}
}
}
}
doc->NotifyUserGestureActivation(modifiers);
}
void EventStateManager::LightDismissOpenPopovers(WidgetEvent* aEvent,
nsIContent* aTargetContent) {
MOZ_ASSERT(aEvent->mMessage == ePointerDown || aEvent->mMessage == ePointerUp,
"Light dismiss must be called for pointer up/down only");
if (!aEvent->IsTrusted() || !aTargetContent) {
return;
}
Element* topmostPopover = aTargetContent->OwnerDoc()->GetTopmostAutoPopover();
if (!topmostPopover) {
return;
}
// Pointerdown: set document's popover pointerdown target to the result of
// running topmost clicked popover given target.
if (aEvent->mMessage == ePointerDown) {
mPopoverPointerDownTarget = aTargetContent->GetTopmostClickedPopover();
return;
}
// Pointerup: hide open popovers.
RefPtr<nsINode> ancestor = aTargetContent->GetTopmostClickedPopover();
bool sameTarget = mPopoverPointerDownTarget == ancestor;
mPopoverPointerDownTarget = nullptr;
if (!sameTarget) {
return;
}
if (!ancestor) {
ancestor = aTargetContent->OwnerDoc();
}
RefPtr<Document> doc(ancestor->OwnerDoc());
doc->HideAllPopoversUntil(*ancestor, false, true);
}
already_AddRefed<EventStateManager> EventStateManager::ESMFromContentOrThis(
nsIContent* aContent) {
if (aContent) {
PresShell* presShell = aContent->OwnerDoc()->GetPresShell();
if (presShell) {
nsPresContext* prescontext = presShell->GetPresContext();
if (prescontext) {
RefPtr<EventStateManager> esm = prescontext->EventStateManager();
if (esm) {
return esm.forget();
}
}
}
}
RefPtr<EventStateManager> esm = this;
return esm.forget();
}
EventStateManager::LastMouseDownInfo& EventStateManager::GetLastMouseDownInfo(
int16_t aButton) {
switch (aButton) {
case MouseButton::ePrimary:
return mLastLeftMouseDownInfo;
case MouseButton::eMiddle:
return mLastMiddleMouseDownInfo;
case MouseButton::eSecondary:
return mLastRightMouseDownInfo;
default:
MOZ_ASSERT_UNREACHABLE("This button shouldn't use this method");
return mLastLeftMouseDownInfo;
}
}
void EventStateManager::HandleQueryContentEvent(
WidgetQueryContentEvent* aEvent) {
switch (aEvent->mMessage) {
case eQuerySelectedText:
case eQueryTextContent:
case eQueryCaretRect:
case eQueryTextRect:
case eQueryEditorRect:
if (!IsTargetCrossProcess(aEvent)) {
break;
}
// Will not be handled locally, remote the event
GetCrossProcessTarget()->HandleQueryContentEvent(*aEvent);
return;
// Following events have not been supported in e10s mode yet.
case eQueryContentState:
case eQuerySelectionAsTransferable:
case eQueryCharacterAtPoint:
case eQueryDOMWidgetHittest:
case eQueryTextRectArray:
case eQueryDropTargetHittest:
break;
default:
return;
}
// If there is an IMEContentObserver, we need to handle QueryContentEvent
// with it.
// eQueryDropTargetHittest is not really an IME event, though
if (mIMEContentObserver && aEvent->mMessage != eQueryDropTargetHittest) {
RefPtr<IMEContentObserver> contentObserver = mIMEContentObserver;
contentObserver->HandleQueryContentEvent(aEvent);
return;
}
ContentEventHandler handler(mPresContext);
handler.HandleQueryContentEvent(aEvent);
}
static AccessKeyType GetAccessKeyTypeFor(nsISupports* aDocShell) {
nsCOMPtr<nsIDocShellTreeItem> treeItem(do_QueryInterface(aDocShell));
if (!treeItem) {
return AccessKeyType::eNone;
}
switch (treeItem->ItemType()) {
case nsIDocShellTreeItem::typeChrome:
return AccessKeyType::eChrome;
case nsIDocShellTreeItem::typeContent:
return AccessKeyType::eContent;
default:
return AccessKeyType::eNone;
}
}
static bool IsAccessKeyTarget(Element* aElement, nsAString& aKey) {
// Use GetAttr because we want Unicode case=insensitive matching
// XXXbz shouldn't this be case-sensitive, per spec?
nsString contentKey;
if (!aElement || !aElement->GetAttr(nsGkAtoms::accesskey, contentKey) ||
!contentKey.Equals(aKey, nsCaseInsensitiveStringComparator)) {
return false;
}
if (!aElement->IsXULElement()) {
return true;
}
// For XUL we do visibility checks.
nsIFrame* frame = aElement->GetPrimaryFrame();
if (!frame) {
return false;
}
if (frame->IsFocusable()) {
return true;
}
if (!frame->IsVisibleConsideringAncestors()) {
return false;
}
// XUL controls can be activated.
nsCOMPtr<nsIDOMXULControlElement> control = aElement->AsXULControl();
if (control) {
return true;
}
// XUL label elements are never focusable, so we need to check for them
// explicitly before giving up.
if (aElement->IsXULElement(nsGkAtoms::label)) {
return true;
}
return false;
}
bool EventStateManager::CheckIfEventMatchesAccessKey(
WidgetKeyboardEvent* aEvent, nsPresContext* aPresContext) {
AutoTArray<uint32_t, 10> accessCharCodes;
aEvent->GetAccessKeyCandidates(accessCharCodes);
return WalkESMTreeToHandleAccessKey(aEvent, aPresContext, accessCharCodes,
nullptr, eAccessKeyProcessingNormal,
false);
}
bool EventStateManager::LookForAccessKeyAndExecute(
nsTArray<uint32_t>& aAccessCharCodes, bool aIsTrustedEvent, bool aIsRepeat,
bool aExecute) {
int32_t count, start = -1;
if (Element* focusedElement = GetFocusedElement()) {
start = mAccessKeys.IndexOf(focusedElement);
if (start == -1 && focusedElement->IsInNativeAnonymousSubtree()) {
start = mAccessKeys.IndexOf(Element::FromNodeOrNull(
focusedElement->GetClosestNativeAnonymousSubtreeRootParentOrHost()));
}
}
RefPtr<Element> element;
int32_t length = mAccessKeys.Count();
for (uint32_t i = 0; i < aAccessCharCodes.Length(); ++i) {
uint32_t ch = aAccessCharCodes[i];
nsAutoString accessKey;
AppendUCS4ToUTF16(ch, accessKey);
for (count = 1; count <= length; ++count) {
// mAccessKeys always stores Element instances.
MOZ_DIAGNOSTIC_ASSERT(length == mAccessKeys.Count());
element = mAccessKeys[(start + count) % length];
if (IsAccessKeyTarget(element, accessKey)) {
if (!aExecute) {
return true;
}
Document* doc = element->OwnerDoc();
const bool shouldActivate = [&] {
if (!StaticPrefs::accessibility_accesskeycausesactivation()) {
return false;
}
if (aIsRepeat && nsContentUtils::IsChromeDoc(doc)) {
return false;
}
// XXXedgar, Bug 1700646, maybe we could use other data structure to
// make searching target with same accesskey easier, and current setup
// could not ensure we cycle the target with tree order.
int32_t j = 0;
while (++j < length) {
Element* el = mAccessKeys[(start + count + j) % length];
if (IsAccessKeyTarget(el, accessKey)) {
return false;
}
}
return true;
}();
// TODO(bug 1641171): This shouldn't be needed if we considered the
// accesskey combination properly.
if (aIsTrustedEvent) {
doc->NotifyUserGestureActivation();
}
auto result =
element->PerformAccesskey(shouldActivate, aIsTrustedEvent);
if (result.isOk()) {
if (result.unwrap() && aIsTrustedEvent) {
// If this is a child process, inform the parent that we want the
// focus, but pass false since we don't want to change the window
// order.
nsIDocShell* docShell = mPresContext->GetDocShell();
nsCOMPtr<nsIBrowserChild> child =
docShell ? docShell->GetBrowserChild() : nullptr;
if (child) {
child->SendRequestFocus(false, CallerType::System);
}
}
return true;
}
}
}
}
return false;
}
// static
void EventStateManager::GetAccessKeyLabelPrefix(Element* aElement,
nsAString& aPrefix) {
aPrefix.Truncate();
nsAutoString separator, modifierText;
nsContentUtils::GetModifierSeparatorText(separator);
AccessKeyType accessKeyType =
GetAccessKeyTypeFor(aElement->OwnerDoc()->GetDocShell());
if (accessKeyType == AccessKeyType::eNone) {
return;
}
Modifiers modifiers = WidgetKeyboardEvent::AccessKeyModifiers(accessKeyType);
if (modifiers == MODIFIER_NONE) {
return;
}
if (modifiers & MODIFIER_CONTROL) {
nsContentUtils::GetControlText(modifierText);
aPrefix.Append(modifierText + separator);
}
if (modifiers & MODIFIER_META) {
nsContentUtils::GetCommandOrWinText(modifierText);
aPrefix.Append(modifierText + separator);
}
if (modifiers & MODIFIER_ALT) {
nsContentUtils::GetAltText(modifierText);
aPrefix.Append(modifierText + separator);
}
if (modifiers & MODIFIER_SHIFT) {
nsContentUtils::GetShiftText(modifierText);
aPrefix.Append(modifierText + separator);
}
}
struct MOZ_STACK_CLASS AccessKeyInfo {
WidgetKeyboardEvent* event;
nsTArray<uint32_t>& charCodes;
AccessKeyInfo(WidgetKeyboardEvent* aEvent, nsTArray<uint32_t>& aCharCodes)
: event(aEvent), charCodes(aCharCodes) {}
};
bool EventStateManager::WalkESMTreeToHandleAccessKey(
WidgetKeyboardEvent* aEvent, nsPresContext* aPresContext,
nsTArray<uint32_t>& aAccessCharCodes, nsIDocShellTreeItem* aBubbledFrom,
ProcessingAccessKeyState aAccessKeyState, bool aExecute) {
EnsureDocument(mPresContext);
nsCOMPtr<nsIDocShell> docShell = aPresContext->GetDocShell();
if (NS_WARN_IF(!docShell) || NS_WARN_IF(!mDocument)) {
return false;
}
AccessKeyType accessKeyType = GetAccessKeyTypeFor(docShell);
if (accessKeyType == AccessKeyType::eNone) {
return false;
}
// Alt or other accesskey modifier is down, we may need to do an accesskey.
if (mAccessKeys.Count() > 0 &&
aEvent->ModifiersMatchWithAccessKey(accessKeyType)) {
// Someone registered an accesskey. Find and activate it.
if (LookForAccessKeyAndExecute(aAccessCharCodes, aEvent->IsTrusted(),
aEvent->mIsRepeat, aExecute)) {
return true;
}
}
int32_t childCount;
docShell->GetInProcessChildCount(&childCount);
for (int32_t counter = 0; counter < childCount; counter++) {
// Not processing the child which bubbles up the handling
nsCOMPtr<nsIDocShellTreeItem> subShellItem;
docShell->GetInProcessChildAt(counter, getter_AddRefs(subShellItem));
if (aAccessKeyState == eAccessKeyProcessingUp &&
subShellItem == aBubbledFrom) {
continue;
}
nsCOMPtr<nsIDocShell> subDS = do_QueryInterface(subShellItem);
if (subDS && IsShellVisible(subDS)) {
// Guarantee subPresShell lifetime while we're handling access key
// since somebody may assume that it won't be deleted before the
// corresponding nsPresContext and EventStateManager.
RefPtr<PresShell> subPresShell = subDS->GetPresShell();
// Docshells need not have a presshell (eg. display:none
// iframes, docshells in transition between documents, etc).
if (!subPresShell) {
// Oh, well. Just move on to the next child
continue;
}
RefPtr<nsPresContext> subPresContext = subPresShell->GetPresContext();
RefPtr<EventStateManager> esm =
static_cast<EventStateManager*>(subPresContext->EventStateManager());
if (esm && esm->WalkESMTreeToHandleAccessKey(
aEvent, subPresContext, aAccessCharCodes, nullptr,
eAccessKeyProcessingDown, aExecute)) {
return true;
}
}
} // if end . checking all sub docshell ends here.
// bubble up the process to the parent docshell if necessary
if (eAccessKeyProcessingDown != aAccessKeyState) {
nsCOMPtr<nsIDocShellTreeItem> parentShellItem;
docShell->GetInProcessParent(getter_AddRefs(parentShellItem));
nsCOMPtr<nsIDocShell> parentDS = do_QueryInterface(parentShellItem);
if (parentDS) {
// Guarantee parentPresShell lifetime while we're handling access key
// since somebody may assume that it won't be deleted before the
// corresponding nsPresContext and EventStateManager.
RefPtr<PresShell> parentPresShell = parentDS->GetPresShell();
NS_ASSERTION(parentPresShell,
"Our PresShell exists but the parent's does not?");
RefPtr<nsPresContext> parentPresContext =
parentPresShell->GetPresContext();
NS_ASSERTION(parentPresContext, "PresShell without PresContext");
RefPtr<EventStateManager> esm = static_cast<EventStateManager*>(
parentPresContext->EventStateManager());
if (esm && esm->WalkESMTreeToHandleAccessKey(
aEvent, parentPresContext, aAccessCharCodes, docShell,
eAccessKeyProcessingDown, aExecute)) {
return true;
}
}
} // if end. bubble up process
// If the content access key modifier is pressed, try remote children
if (aExecute &&
aEvent->ModifiersMatchWithAccessKey(AccessKeyType::eContent) &&
mDocument && mDocument->GetWindow()) {
// If the focus is currently on a node with a BrowserParent, the key event
// should've gotten forwarded to the child process and HandleAccessKey
// called from there.
if (BrowserParent::GetFrom(GetFocusedElement())) {
// If access key may be only in remote contents, this method won't handle
// access key synchronously. In this case, only reply event should reach
// here.
MOZ_ASSERT(aEvent->IsHandledInRemoteProcess() ||
!aEvent->IsWaitingReplyFromRemoteProcess());
}
// If focus is somewhere else, then we need to check the remote children.
// However, if the event has already been handled in a remote process,
// then, focus is moved from the remote process after posting the event.
// In such case, we shouldn't retry to handle access keys in remote
// processes.
else if (!aEvent->IsHandledInRemoteProcess()) {
AccessKeyInfo accessKeyInfo(aEvent, aAccessCharCodes);
nsContentUtils::CallOnAllRemoteChildren(
mDocument->GetWindow(),
[&accessKeyInfo](BrowserParent* aBrowserParent) -> CallState {
// Only forward accesskeys for the active tab.
if (aBrowserParent->GetDocShellIsActive()) {
// Even if there is no target for the accesskey in this process,
// the event may match with a content accesskey. If so, the
// keyboard event should be handled with reply event for
// preventing double action. (e.g., Alt+Shift+F on Windows may
// focus a content in remote and open "File" menu.)
accessKeyInfo.event->StopPropagation();
accessKeyInfo.event->MarkAsWaitingReplyFromRemoteProcess();
aBrowserParent->HandleAccessKey(*accessKeyInfo.event,
accessKeyInfo.charCodes);
return CallState::Stop;
}
return CallState::Continue;
});
}
}
return false;
} // end of HandleAccessKey
static BrowserParent* GetBrowserParentAncestor(BrowserParent* aBrowserParent) {
MOZ_ASSERT(aBrowserParent);
BrowserBridgeParent* bbp = aBrowserParent->GetBrowserBridgeParent();
if (!bbp) {
return nullptr;
}
return bbp->Manager();
}
static void DispatchCrossProcessMouseExitEvents(WidgetMouseEvent* aMouseEvent,
BrowserParent* aRemoteTarget,
BrowserParent* aStopAncestor,
bool aIsReallyExit) {
MOZ_ASSERT(aMouseEvent);
MOZ_ASSERT(aRemoteTarget);
MOZ_ASSERT(aRemoteTarget != aStopAncestor);
MOZ_ASSERT_IF(aStopAncestor, nsContentUtils::GetCommonBrowserParentAncestor(
aRemoteTarget, aStopAncestor));
while (aRemoteTarget != aStopAncestor) {
UniquePtr<WidgetMouseEvent> mouseExitEvent =
CreateMouseOrPointerWidgetEvent(aMouseEvent, eMouseExitFromWidget,
aMouseEvent->mRelatedTarget);
mouseExitEvent->mExitFrom =
Some(aIsReallyExit ? WidgetMouseEvent::ePuppet
: WidgetMouseEvent::ePuppetParentToPuppetChild);
auto ContentReactsToPointerEvents = [](BrowserParent* aRemoteTarget) {
if (Element* owner = aRemoteTarget->GetOwnerElement()) {
if (nsSubDocumentFrame* subDocFrame =
do_QueryFrame(owner->GetPrimaryFrame())) {
return subDocFrame->ContentReactsToPointerEvents();
}
}
return true;
};
if (ContentReactsToPointerEvents(aRemoteTarget)) {
aRemoteTarget->SendRealMouseEvent(*mouseExitEvent);
}
aRemoteTarget = GetBrowserParentAncestor(aRemoteTarget);
}
}
void EventStateManager::DispatchCrossProcessEvent(WidgetEvent* aEvent,
BrowserParent* aRemoteTarget,
nsEventStatus* aStatus) {
MOZ_ASSERT(aEvent);
MOZ_ASSERT(aRemoteTarget);
MOZ_ASSERT(aStatus);
BrowserParent* remote = aRemoteTarget;
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
bool isContextMenuKey = mouseEvent && mouseEvent->IsContextMenuKeyEvent();
if (aEvent->mClass == eKeyboardEventClass || isContextMenuKey) {
// APZ attaches a LayersId to hit-testable events, for keyboard events,
// we use focus.
BrowserParent* preciseRemote = BrowserParent::GetFocused();
if (preciseRemote) {
remote = preciseRemote;
}
// else there is a race between layout and focus tracking,
// so fall back to delivering the event to the topmost child process.
} else if (aEvent->mLayersId.IsValid()) {
BrowserParent* preciseRemote =
BrowserParent::GetBrowserParentFromLayersId(aEvent->mLayersId);
if (preciseRemote) {
remote = preciseRemote;
}
// else there is a race between APZ and the LayersId to BrowserParent
// mapping, so fall back to delivering the event to the topmost child
// process.
}
MOZ_ASSERT(aEvent->mMessage != ePointerClick);
MOZ_ASSERT(aEvent->mMessage != ePointerAuxClick);
// SendReal* will transform the coordinate to the child process coordinate
// space. So restore the coordinate after the event has been dispatched to the
// child process to avoid using the transformed coordinate afterward.
AutoRestore<LayoutDeviceIntPoint> restore(aEvent->mRefPoint);
switch (aEvent->mClass) {
case ePointerEventClass:
MOZ_ASSERT(aEvent->mMessage == eContextMenu);
[[fallthrough]];
case eMouseEventClass: {
BrowserParent* oldRemote = BrowserParent::GetLastMouseRemoteTarget();
// If this is a eMouseExitFromWidget event, need to redirect the event to
// the last remote and and notify all its ancestors about the exit, if
// any.
if (mouseEvent->mMessage == eMouseExitFromWidget) {
MOZ_ASSERT(mouseEvent->mExitFrom.value() == WidgetMouseEvent::ePuppet);
MOZ_ASSERT(mouseEvent->mReason == WidgetMouseEvent::eReal);
MOZ_ASSERT(!mouseEvent->mLayersId.IsValid());
MOZ_ASSERT(remote->GetBrowserHost());
if (oldRemote && oldRemote != remote) {
Unused << NS_WARN_IF(nsContentUtils::GetCommonBrowserParentAncestor(
remote, oldRemote) != remote);
remote = oldRemote;
}
DispatchCrossProcessMouseExitEvents(mouseEvent, remote, nullptr, true);
return;
}
if (BrowserParent* pointerLockedRemote =
PointerLockManager::GetLockedRemoteTarget()) {
remote = pointerLockedRemote;
} else if (BrowserParent* pointerCapturedRemote =
PointerEventHandler::GetPointerCapturingRemoteTarget(
mouseEvent->pointerId)) {
remote = pointerCapturedRemote;
} else if (BrowserParent* capturingRemote =
PresShell::GetCapturingRemoteTarget()) {
remote = capturingRemote;
}
// If a mouse is over a remote target A, and then moves to
// remote target B, we'd deliver the event directly to remote target B
// after the moving, A would never get notified that the mouse left.
// So we generate a exit event to notify A after the move.
// XXXedgar, if the synthesized mouse events could deliver to the correct
// process directly (see
// don't need to check mReason then.
if (mouseEvent->mReason == WidgetMouseEvent::eReal &&
remote != oldRemote) {
MOZ_ASSERT(mouseEvent->mMessage != eMouseExitFromWidget);
if (oldRemote) {
BrowserParent* commonAncestor =
nsContentUtils::GetCommonBrowserParentAncestor(remote, oldRemote);
if (commonAncestor == oldRemote) {
// Mouse moves to the inner OOP frame, it is not a really exit.
DispatchCrossProcessMouseExitEvents(
mouseEvent, GetBrowserParentAncestor(remote),
GetBrowserParentAncestor(commonAncestor), false);
} else if (commonAncestor == remote) {
// Mouse moves to the outer OOP frame, it is a really exit.
DispatchCrossProcessMouseExitEvents(mouseEvent, oldRemote,
commonAncestor, true);
} else {
// Mouse moves to OOP frame in other subtree, it is a really exit,
// need to notify all its ancestors before common ancestor about the
// exit.
DispatchCrossProcessMouseExitEvents(mouseEvent, oldRemote,
commonAncestor, true);
if (commonAncestor) {
UniquePtr<WidgetMouseEvent> mouseExitEvent =
CreateMouseOrPointerWidgetEvent(mouseEvent,
eMouseExitFromWidget,
mouseEvent->mRelatedTarget);
mouseExitEvent->mExitFrom =
Some(WidgetMouseEvent::ePuppetParentToPuppetChild);
commonAncestor->SendRealMouseEvent(*mouseExitEvent);
}
}
}
if (mouseEvent->mMessage != eMouseExitFromWidget &&
mouseEvent->mMessage != eMouseEnterIntoWidget) {
// This is to make cursor would be updated correctly.
remote->MouseEnterIntoWidget();
}
}
remote->SendRealMouseEvent(*mouseEvent);
return;
}
case eKeyboardEventClass: {
auto* keyboardEvent = aEvent->AsKeyboardEvent();
if (aEvent->mMessage == eKeyUp) {
HandleKeyUpInteraction(keyboardEvent);
}
remote->SendRealKeyEvent(*keyboardEvent);
return;
}
case eWheelEventClass: {
if (BrowserParent* pointerLockedRemote =
PointerLockManager::GetLockedRemoteTarget()) {
remote = pointerLockedRemote;
}
remote->SendMouseWheelEvent(*aEvent->AsWheelEvent());
return;
}
case eTouchEventClass: {
// Let the child process synthesize a mouse event if needed, and
// ensure we don't synthesize one in this process.
*aStatus = nsEventStatus_eConsumeNoDefault;
remote->SendRealTouchEvent(*aEvent->AsTouchEvent());
return;
}
case eDragEventClass: {
RefPtr<BrowserParent> browserParent = remote;
browserParent->MaybeInvokeDragSession(aEvent->mMessage);
RefPtr<nsIWidget> widget = browserParent->GetTopLevelWidget();
nsCOMPtr<nsIDragSession> dragSession =
nsContentUtils::GetDragSession(widget);
uint32_t dropEffect = nsIDragService::DRAGDROP_ACTION_NONE;
uint32_t action = nsIDragService::DRAGDROP_ACTION_NONE;
nsCOMPtr<nsIPrincipal> principal;
nsCOMPtr<nsIContentSecurityPolicy> csp;
if (dragSession) {
dragSession->DragEventDispatchedToChildProcess();
dragSession->GetDragAction(&action);
dragSession->GetTriggeringPrincipal(getter_AddRefs(principal));
dragSession->GetCsp(getter_AddRefs(csp));
RefPtr<DataTransfer> initialDataTransfer =
dragSession->GetDataTransfer();
if (initialDataTransfer) {
dropEffect = initialDataTransfer->DropEffectInt();
}
}
browserParent->SendRealDragEvent(*aEvent->AsDragEvent(), action,
dropEffect, principal, csp);
return;
}
default: {
MOZ_CRASH("Attempt to send non-whitelisted event?");
}
}
}
bool EventStateManager::IsRemoteTarget(nsIContent* target) {
return BrowserParent::GetFrom(target) || BrowserBridgeChild::GetFrom(target);
}
bool EventStateManager::IsTopLevelRemoteTarget(nsIContent* target) {
return !!BrowserParent::GetFrom(target);
}
bool EventStateManager::HandleCrossProcessEvent(WidgetEvent* aEvent,
nsEventStatus* aStatus) {
if (!aEvent->CanBeSentToRemoteProcess()) {
return false;
}
MOZ_ASSERT(!aEvent->HasBeenPostedToRemoteProcess(),
"Why do we need to post same event to remote processes again?");
// Collect the remote event targets we're going to forward this
// event to.
//
// NB: the elements of |remoteTargets| must be unique, for correctness.
AutoTArray<RefPtr<BrowserParent>, 1> remoteTargets;
if (aEvent->mClass != eTouchEventClass || aEvent->mMessage == eTouchStart) {
// If this event only has one target, and it's remote, add it to
// the array.
nsIFrame* frame = aEvent->mMessage == eDragExit
? sLastDragOverFrame.GetFrame()
: GetEventTarget();
nsIContent* target = frame ? frame->GetContent() : nullptr;
if (BrowserParent* remoteTarget = BrowserParent::GetFrom(target)) {
remoteTargets.AppendElement(remoteTarget);
}
} else {
// This is a touch event with possibly multiple touch points.
// Each touch point may have its own target. So iterate through
// all of them and collect the unique set of targets for event
// forwarding.
//
// This loop is similar to the one used in
// PresShell::DispatchTouchEvent().
const WidgetTouchEvent::TouchArray& touches =
aEvent->AsTouchEvent()->mTouches;
for (uint32_t i = 0; i < touches.Length(); ++i) {
Touch* touch = touches[i];
// NB: the |mChanged| check is an optimization, subprocesses can
// compute this for themselves. If the touch hasn't changed, we
// may be able to avoid forwarding the event entirely (which is
// not free).
if (!touch || !touch->mChanged) {
continue;
}
nsCOMPtr<EventTarget> targetPtr = touch->mTarget;
if (!targetPtr) {
continue;
}
nsCOMPtr<nsIContent> target = do_QueryInterface(targetPtr);
BrowserParent* remoteTarget = BrowserParent::GetFrom(target);
if (remoteTarget && !remoteTargets.Contains(remoteTarget)) {
remoteTargets.AppendElement(remoteTarget);
}
}
}
if (remoteTargets.Length() == 0) {
return false;
}
// Dispatch the event to the remote target.
for (uint32_t i = 0; i < remoteTargets.Length(); ++i) {
DispatchCrossProcessEvent(aEvent, remoteTargets[i], aStatus);
}
return aEvent->HasBeenPostedToRemoteProcess();
}
//
// CreateClickHoldTimer
//
// Fire off a timer for determining if the user wants click-hold. This timer
// is a one-shot that will be cancelled when the user moves enough to fire
// a drag.
//
void EventStateManager::CreateClickHoldTimer(nsPresContext* inPresContext,
nsIFrame* inDownFrame,
WidgetGUIEvent* inMouseDownEvent) {
if (!inMouseDownEvent->IsTrusted() ||
IsTopLevelRemoteTarget(mGestureDownContent) ||
PointerLockManager::IsLocked()) {
return;
}
// just to be anal (er, safe)
if (mClickHoldTimer) {
mClickHoldTimer->Cancel();
mClickHoldTimer = nullptr;
}
// if content clicked on has a popup, don't even start the timer
// since we'll end up conflicting and both will show.
if (mGestureDownContent &&
nsContentUtils::HasNonEmptyAttr(mGestureDownContent, kNameSpaceID_None,
nsGkAtoms::popup)) {
return;
}
int32_t clickHoldDelay = StaticPrefs::ui_click_hold_context_menus_delay();
NS_NewTimerWithFuncCallback(
getter_AddRefs(mClickHoldTimer), sClickHoldCallback, this, clickHoldDelay,
nsITimer::TYPE_ONE_SHOT, "EventStateManager::CreateClickHoldTimer");
} // CreateClickHoldTimer
//
// KillClickHoldTimer
//
// Stop the timer that would show the context menu dead in its tracks
//
void EventStateManager::KillClickHoldTimer() {
if (mClickHoldTimer) {
mClickHoldTimer->Cancel();
mClickHoldTimer = nullptr;
}
}
//
// sClickHoldCallback
//
// This fires after the mouse has been down for a certain length of time.
//
void EventStateManager::sClickHoldCallback(nsITimer* aTimer, void* aESM) {
RefPtr<EventStateManager> self = static_cast<EventStateManager*>(aESM);
if (self) {
self->FireContextClick();
}
// NOTE: |aTimer| and |self->mAutoHideTimer| are invalid after calling
// ClosePopup();
} // sAutoHideCallback
//
// FireContextClick
//
// If we're this far, our timer has fired, which means the mouse has been down
// for a certain period of time and has not moved enough to generate a
// dragGesture. We can be certain the user wants a context-click at this stage,
// so generate a dom event and fire it in.
//
// After the event fires, check if PreventDefault() has been set on the event
// which means that someone either ate the event or put up a context menu. This
// is our cue to stop tracking the drag gesture. If we always did this,
// draggable items w/out a context menu wouldn't be draggable after a certain
// length of time, which is _not_ what we want.
//
void EventStateManager::FireContextClick() {
if (!mGestureDownContent || !mPresContext || PointerLockManager::IsLocked()) {
return;
}
#ifdef XP_MACOSX
// Hack to ensure that we don't show a context menu when the user
// let go of the mouse after a long cpu-hogging operation prevented
// us from handling any OS events. See bug 117589.
if (!CGEventSourceButtonState(kCGEventSourceStateCombinedSessionState,
kCGMouseButtonLeft))
return;
#endif
nsEventStatus status = nsEventStatus_eIgnore;
// Dispatch to the DOM. We have to fake out the ESM and tell it that the
// current target frame is actually where the mouseDown occurred, otherwise it
// will use the frame the mouse is currently over which may or may not be
// the same. (Note: saari and I have decided that we don't have to reset
// |mCurrentTarget| when we're through because no one else is doing anything
// more with this event and it will get reset on the very next event to the
// correct frame).
mCurrentTarget = mPresContext->GetPrimaryFrameFor(mGestureDownContent);
// make sure the widget sticks around
nsCOMPtr<nsIWidget> targetWidget;
if (mCurrentTarget && (targetWidget = mCurrentTarget->GetNearestWidget())) {
NS_ASSERTION(
mPresContext == mCurrentTarget->PresContext(),
"a prescontext returned a primary frame that didn't belong to it?");
// before dispatching, check that we're not on something that
// doesn't get a context menu
bool allowedToDispatch = true;
if (mGestureDownContent->IsAnyOfXULElements(nsGkAtoms::scrollbar,
nsGkAtoms::scrollbarbutton,
nsGkAtoms::button)) {
allowedToDispatch = false;
} else if (mGestureDownContent->IsXULElement(nsGkAtoms::toolbarbutton)) {
// a <toolbarbutton> that has the container attribute set
// will already have its own dropdown.
if (nsContentUtils::HasNonEmptyAttr(
mGestureDownContent, kNameSpaceID_None, nsGkAtoms::container)) {
allowedToDispatch = false;
} else {
// If the toolbar button has an open menu, don't attempt to open
// a second menu
if (mGestureDownContent->IsElement() &&
mGestureDownContent->AsElement()->AttrValueIs(
kNameSpaceID_None, nsGkAtoms::open, nsGkAtoms::_true,
eCaseMatters)) {
allowedToDispatch = false;
}
}
} else if (mGestureDownContent->IsHTMLElement()) {
if (const auto* formCtrl =
nsIFormControl::FromNode(mGestureDownContent)) {
allowedToDispatch =
formCtrl->IsTextControl(/*aExcludePassword*/ false) ||
formCtrl->ControlType() == FormControlType::InputFile;
} else if (mGestureDownContent->IsAnyOfHTMLElements(
nsGkAtoms::embed, nsGkAtoms::object, nsGkAtoms::label)) {
allowedToDispatch = false;
}
}
if (allowedToDispatch) {
// init the event while mCurrentTarget is still good
WidgetPointerEvent event(true, eContextMenu, targetWidget);
event.mClickCount = 1;
FillInEventFromGestureDown(&event);
// we need to forget the clicking content and click count for the
// following eMouseUp event when click-holding context menus
LastMouseDownInfo& mouseDownInfo = GetLastMouseDownInfo(event.mButton);
mouseDownInfo.mLastMouseDownContent = nullptr;
mouseDownInfo.mClickCount = 0;
mouseDownInfo.mLastMouseDownInputControlType = Nothing();
// stop selection tracking, we're in control now
if (mCurrentTarget) {
RefPtr<nsFrameSelection> frameSel = mCurrentTarget->GetFrameSelection();
if (frameSel && frameSel->GetDragState()) {
// note that this can cause selection changed events to fire if we're
// in a text field, which will null out mCurrentTarget
frameSel->SetDragState(false);
}
}
AutoHandlingUserInputStatePusher userInpStatePusher(true, &event);
// dispatch to DOM
RefPtr<nsPresContext> presContext = mPresContext;
// The contextmenu event handled by PresShell will apply to elements (not
// all nodes) correctly and will be dispatched to EventStateManager for
// further handling preventing click event and stopping tracking drag
// gesture.
if (RefPtr<PresShell> presShell = presContext->GetPresShell()) {
presShell->HandleEvent(mCurrentTarget, &event, false, &status);
}
// We don't need to dispatch to frame handling because no frames
// watch eContextMenu except for nsMenuFrame and that's only for
// dismissal. That's just as well since we don't really know
// which frame to send it to.
}
}
// stop tracking a drag whatever the event has been handled or not.
StopTrackingDragGesture(true);
KillClickHoldTimer();
} // FireContextClick
//
// BeginTrackingDragGesture
//
// Record that the mouse has gone down and that we should move to TRACKING state
// of d&d gesture tracker.
//
// We also use this to track click-hold context menus. When the mouse goes down,
// fire off a short timer. If the timer goes off and we have yet to fire the
// drag gesture (ie, the mouse hasn't moved a certain distance), then we can
// assume the user wants a click-hold, so fire a context-click event. We only
// want to cancel the drag gesture if the context-click event is handled.
//
void EventStateManager::BeginTrackingDragGesture(nsPresContext* aPresContext,
WidgetMouseEvent* inDownEvent,
nsIFrame* inDownFrame) {
if (!inDownEvent->mWidget) {
return;
}
// Note that |inDownEvent| could be either a mouse down event or a
// synthesized mouse move event.
SetGestureDownPoint(inDownEvent);
if (inDownFrame) {
mGestureDownContent = inDownFrame->GetContentForEvent(inDownEvent);
mGestureDownFrameOwner = inDownFrame->GetContent();
if (!mGestureDownFrameOwner) {
mGestureDownFrameOwner = mGestureDownContent;
}
}
mGestureModifiers = inDownEvent->mModifiers;
mGestureDownButtons = inDownEvent->mButtons;
mGestureDownButton = inDownEvent->mButton;
if (inDownEvent->mMessage != eMouseTouchDrag &&
StaticPrefs::ui_click_hold_context_menus()) {
// fire off a timer to track click-hold
CreateClickHoldTimer(aPresContext, inDownFrame, inDownEvent);
}
}
void EventStateManager::SetGestureDownPoint(WidgetGUIEvent* aEvent) {
mGestureDownPoint =
GetEventRefPoint(aEvent) + aEvent->mWidget->WidgetToScreenOffset();
}
LayoutDeviceIntPoint EventStateManager::GetEventRefPoint(
WidgetEvent* aEvent) const {
auto touchEvent = aEvent->AsTouchEvent();
return (touchEvent && !touchEvent->mTouches.IsEmpty())
? aEvent->AsTouchEvent()->mTouches[0]->mRefPoint
: aEvent->mRefPoint;
}
void EventStateManager::BeginTrackingRemoteDragGesture(
nsIContent* aContent, RemoteDragStartData* aDragStartData) {
mGestureDownContent = aContent;
mGestureDownFrameOwner = aContent;
mGestureDownInTextControl =
aContent && aContent->IsInNativeAnonymousSubtree() &&
TextControlElement::FromNodeOrNull(
aContent->GetClosestNativeAnonymousSubtreeRootParentOrHost());
mGestureDownDragStartData = aDragStartData;
}
//
// StopTrackingDragGesture
//
// Record that the mouse has gone back up so that we should leave the TRACKING
// state of d&d gesture tracker and return to the START state.
//
void EventStateManager::StopTrackingDragGesture(bool aClearInChildProcesses) {
mGestureDownContent = nullptr;
mGestureDownFrameOwner = nullptr;
mGestureDownInTextControl = false;
mGestureDownDragStartData = nullptr;
// If a content process starts a drag but the mouse is released before the
// parent starts the actual drag, the content process will think a drag is
// still happening. Inform any child processes with active drags that the drag
// should be stopped.
if (!aClearInChildProcesses || !XRE_IsParentProcess()) {
return;
}
// Only notify if there is NOT a drag session active in the parent.
RefPtr<nsIDragSession> dragSession =
nsContentUtils::GetDragSession(mPresContext);
if (dragSession) {
return;
}
nsCOMPtr<nsIDragService> dragService =
do_GetService("@mozilla.org/widget/dragservice;1");
if (!dragService) {
return;
}
dragService->RemoveAllBrowsers();
}
void EventStateManager::FillInEventFromGestureDown(WidgetMouseEvent* aEvent) {
NS_ASSERTION(aEvent->mWidget == mCurrentTarget->GetNearestWidget(),
"Incorrect widget in event");
// Set the coordinates in the new event to the coordinates of
// the old event, adjusted for the fact that the widget might be
// different
aEvent->mRefPoint =
mGestureDownPoint - aEvent->mWidget->WidgetToScreenOffset();
aEvent->mModifiers = mGestureModifiers;
aEvent->mButtons = mGestureDownButtons;
if (aEvent->mMessage == eContextMenu) {
aEvent->mButton = mGestureDownButton;
}
}
void EventStateManager::MaybeFirePointerCancel(WidgetInputEvent* aEvent) {
// If aEvent is a synthesized mouse event, it does not have enough information
// to initialize ePointerCancel.
MOZ_ASSERT_IF(aEvent->AsMouseEvent(), aEvent->AsMouseEvent()->IsReal());
// The caller must want to dispatch ePointerCancel even if an event listener
// of the preceding event may update the layout. So, the caller should
// guarantee the target frame.
MOZ_ASSERT(mCurrentTarget);
RefPtr<PresShell> presShell = mPresContext->GetPresShell();
AutoWeakFrame targetFrame = mCurrentTarget;
if (!presShell || !targetFrame) {
return;
}
nsCOMPtr<nsIContent> content = targetFrame->GetContentForEvent(aEvent);
// XXX If there is no proper event target, should we retarget ePointerCancel
// somewhere else?
if (NS_WARN_IF(!content)) {
return;
}
nsEventStatus status = nsEventStatus_eIgnore;
if (WidgetMouseEvent* aMouseEvent = aEvent->AsMouseEvent()) {
WidgetPointerEvent event(*aMouseEvent);
PointerEventHandler::InitPointerEventFromMouse(&event, aMouseEvent,
ePointerCancel);
event.convertToPointer = false;
presShell->HandleEventWithTarget(&event, targetFrame, content, &status);
} else if (WidgetTouchEvent* aTouchEvent = aEvent->AsTouchEvent()) {
WidgetPointerEvent event(aTouchEvent->IsTrusted(), ePointerCancel,
aTouchEvent->mWidget);
PointerEventHandler::InitPointerEventFromTouch(event, *aTouchEvent,
*aTouchEvent->mTouches[0]);
event.convertToPointer = false;
presShell->HandleEventWithTarget(&event, targetFrame, content, &status);
} else {
MOZ_ASSERT(false);
}
// HandleEventWithTarget clears out mCurrentTarget, which may be used in the
// caller GenerateDragGesture. We have to restore mCurrentTarget.
mCurrentTarget = targetFrame;
}
bool EventStateManager::IsEventOutsideDragThreshold(
WidgetInputEvent* aEvent) const {
static int32_t sPixelThresholdX = 0;
static int32_t sPixelThresholdY = 0;
if (!sPixelThresholdX) {
sPixelThresholdX =
LookAndFeel::GetInt(LookAndFeel::IntID::DragThresholdX, 0);
sPixelThresholdY =
LookAndFeel::GetInt(LookAndFeel::IntID::DragThresholdY, 0);
if (sPixelThresholdX <= 0) {
sPixelThresholdX = 5;
}
if (sPixelThresholdY <= 0) {
sPixelThresholdY = 5;
}
}
LayoutDeviceIntPoint pt =
aEvent->mWidget->WidgetToScreenOffset() + GetEventRefPoint(aEvent);
LayoutDeviceIntPoint distance = pt - mGestureDownPoint;
return Abs(distance.x) > sPixelThresholdX ||
Abs(distance.y) > sPixelThresholdY;
}
//
// GenerateDragGesture
//
// If we're in the TRACKING state of the d&d gesture tracker, check the current
// position of the mouse in relation to the old one. If we've moved a sufficient
// amount from the mouse down, then fire off a drag gesture event.
void EventStateManager::GenerateDragGesture(nsPresContext* aPresContext,
WidgetInputEvent* aEvent) {
NS_ASSERTION(aPresContext, "This shouldn't happen.");
MOZ_ASSERT_IF(aEvent->AsMouseEvent(), aEvent->AsMouseEvent()->IsReal());
if (!IsTrackingDragGesture()) {
return;
}
AutoWeakFrame targetFrameBefore = mCurrentTarget;
auto autoRestore = MakeScopeExit([&] { mCurrentTarget = targetFrameBefore; });
mCurrentTarget = mGestureDownFrameOwner->GetPrimaryFrame();
if (!mCurrentTarget || !mCurrentTarget->GetNearestWidget()) {
StopTrackingDragGesture(true);
return;
}
// Check if selection is tracking drag gestures, if so
// don't interfere!
if (mCurrentTarget) {
RefPtr<nsFrameSelection> frameSel = mCurrentTarget->GetFrameSelection();
if (frameSel && frameSel->GetDragState()) {
StopTrackingDragGesture(true);
return;
}
}
// If non-native code is capturing the mouse don't start a drag.
if (PresShell::IsMouseCapturePreventingDrag()) {
StopTrackingDragGesture(true);
return;
}
if (!IsEventOutsideDragThreshold(aEvent)) {
// To keep the old behavior, flush layout even if we don't start dnd.
FlushLayout(aPresContext);
return;
}
if (StaticPrefs::ui_click_hold_context_menus()) {
// stop the click-hold before we fire off the drag gesture, in case
// it takes a long time
KillClickHoldTimer();
}
nsCOMPtr<nsIDocShell> docshell = aPresContext->GetDocShell();
if (!docshell) {
return;
}
nsCOMPtr<nsPIDOMWindowOuter> window = docshell->GetWindow();
if (!window) return;
RefPtr<DataTransfer> dataTransfer =
new DataTransfer(window, eDragStart, /* aIsExternal */ false,
/* aClipboardType */ Nothing());
auto protectDataTransfer = MakeScopeExit([&] {
if (dataTransfer) {
dataTransfer->Disconnect();
}
});
RefPtr<Selection> selection;
RefPtr<RemoteDragStartData> remoteDragStartData;
nsCOMPtr<nsIPrincipal> principal;
nsCOMPtr<nsIContentSecurityPolicy> csp;
nsCOMPtr<nsICookieJarSettings> cookieJarSettings;
nsCOMPtr<nsIContent> eventContent =
mCurrentTarget->GetContentForEvent(aEvent);
nsCOMPtr<nsIContent> targetContent;
bool allowEmptyDataTransfer = false;
if (eventContent) {
// If the content is a text node in a password field, we shouldn't
// allow to drag its raw text. Note that we've supported drag from
// password fields but dragging data was masked text. So, it doesn't
// make sense anyway.
if (eventContent->IsText() && eventContent->HasFlag(NS_MAYBE_MASKED)) {
// However, it makes sense to allow to drag selected password text
// when copying selected password is allowed because users may want
// to use drag and drop rather than copy and paste when web apps
// request to input password twice for conforming new password but
// they used password generator.
const TextEditor* const textEditor =
nsContentUtils::GetExtantTextEditorFromAnonymousNode(eventContent);
if (!textEditor || !textEditor->IsCopyToClipboardAllowed()) {
StopTrackingDragGesture(true);
return;
}
}
DetermineDragTargetAndDefaultData(
window, eventContent, dataTransfer, &allowEmptyDataTransfer,
getter_AddRefs(selection), getter_AddRefs(remoteDragStartData),
getter_AddRefs(targetContent), getter_AddRefs(principal),
getter_AddRefs(csp), getter_AddRefs(cookieJarSettings));
}
// Stop tracking the drag gesture now. This should stop us from
// reentering GenerateDragGesture inside DOM event processing.
// Pass false to avoid clearing the child process state since a real
// drag should be starting.
StopTrackingDragGesture(false);
if (!targetContent) return;
// Use our targetContent, now that we've determined it, as the
// parent object of the DataTransfer.
nsCOMPtr<nsIContent> parentContent =
targetContent->FindFirstNonChromeOnlyAccessContent();
dataTransfer->SetParentObject(parentContent);
sLastDragOverFrame = nullptr;
nsCOMPtr<nsIWidget> widget = mCurrentTarget->GetNearestWidget();
// get the widget from the target frame
WidgetDragEvent startEvent(aEvent->IsTrusted(), eDragStart, widget);
startEvent.mFlags.mIsSynthesizedForTests =
aEvent->mFlags.mIsSynthesizedForTests;
FillInEventFromGestureDown(&startEvent);
startEvent.mDataTransfer = dataTransfer;
if (aEvent->AsMouseEvent()) {
startEvent.mInputSource = aEvent->AsMouseEvent()->mInputSource;
} else if (aEvent->AsTouchEvent()) {
startEvent.mInputSource = MouseEvent_Binding::MOZ_SOURCE_TOUCH;
} else {
MOZ_ASSERT(false);
}
// Dispatch to the DOM. By setting mCurrentTarget we are faking
// out the ESM and telling it that the current target frame is
// actually where the mouseDown occurred, otherwise it will use
// the frame the mouse is currently over which may or may not be
// the same.
// Hold onto old target content through the event and reset after.
nsCOMPtr<nsIContent> targetBeforeEvent = mCurrentTargetContent;
// Set the current target to the content for the mouse down
mCurrentTargetContent = targetContent;
// Dispatch the dragstart event to the DOM.
nsEventStatus status = nsEventStatus_eIgnore;
EventDispatcher::Dispatch(targetContent, aPresContext, &startEvent, nullptr,
&status);
WidgetDragEvent* event = &startEvent;
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
// Emit observer event to allow addons to modify the DataTransfer
// object.
if (observerService) {
observerService->NotifyObservers(dataTransfer, "on-datatransfer-available",
nullptr);
}
if (status != nsEventStatus_eConsumeNoDefault) {
bool dragStarted = DoDefaultDragStart(aPresContext, event, dataTransfer,
allowEmptyDataTransfer, targetContent,
selection, remoteDragStartData,
principal, csp, cookieJarSettings);
if (dragStarted) {
sActiveESM = nullptr;
MaybeFirePointerCancel(aEvent);
aEvent->StopPropagation();
}
}
// Reset mCurretTargetContent to what it was
mCurrentTargetContent = targetBeforeEvent;
// Now flush all pending notifications, for better responsiveness
// while dragging.
FlushLayout(aPresContext);
} // GenerateDragGesture
void EventStateManager::DetermineDragTargetAndDefaultData(
nsPIDOMWindowOuter* aWindow, nsIContent* aSelectionTarget,
DataTransfer* aDataTransfer, bool* aAllowEmptyDataTransfer,
Selection** aSelection, RemoteDragStartData** aRemoteDragStartData,
nsIContent** aTargetNode, nsIPrincipal** aPrincipal,
nsIContentSecurityPolicy** aCsp,
nsICookieJarSettings** aCookieJarSettings) {
*aTargetNode = nullptr;
*aAllowEmptyDataTransfer = false;
nsCOMPtr<nsIContent> dragDataNode;
nsIContent* editingElement = aSelectionTarget->IsEditable()
? aSelectionTarget->GetEditingHost()
: nullptr;
// In chrome, only allow dragging inside editable areas.
bool isChromeContext = !aWindow->GetBrowsingContext()->IsContent();
if (isChromeContext && !editingElement) {
if (mGestureDownDragStartData) {
// A child process started a drag so use any data it assigned for the dnd
// session.
mGestureDownDragStartData->AddInitialDnDDataTo(aDataTransfer, aPrincipal,
aCsp, aCookieJarSettings);
mGestureDownDragStartData.forget(aRemoteDragStartData);
*aAllowEmptyDataTransfer = true;
}
} else {
mGestureDownDragStartData = nullptr;
// GetDragData determines if a selection, link or image in the content
// should be dragged, and places the data associated with the drag in the
// data transfer.
// mGestureDownContent is the node where the mousedown event for the drag
// occurred, and aSelectionTarget is the node to use when a selection is
// used
bool canDrag;
bool wasAlt = (mGestureModifiers & MODIFIER_ALT) != 0;
nsresult rv = nsContentAreaDragDrop::GetDragData(
aWindow, mGestureDownContent, aSelectionTarget, wasAlt, aDataTransfer,
&canDrag, aSelection, getter_AddRefs(dragDataNode), aCsp,
aCookieJarSettings);
if (NS_FAILED(rv) || !canDrag) {
return;
}
}
// if GetDragData returned a node, use that as the node being dragged.
// Otherwise, if a selection is being dragged, use the node within the
// selection that was dragged. Otherwise, just use the mousedown target.
nsIContent* dragContent = mGestureDownContent;
if (dragDataNode)
dragContent = dragDataNode;
else if (*aSelection)
dragContent = aSelectionTarget;
nsIContent* originalDragContent = dragContent;
// If a selection isn't being dragged, look for an ancestor with the
// draggable property set. If one is found, use that as the target of the
// drag instead of the node that was clicked on. If a draggable node wasn't
// found, just use the clicked node.
if (!*aSelection) {
while (dragContent) {
if (auto htmlElement = nsGenericHTMLElement::FromNode(dragContent)) {
if (htmlElement->Draggable()) {
// We let draggable elements to trigger dnd even if there is no data
// in the DataTransfer.
*aAllowEmptyDataTransfer = true;
break;
}
} else {
if (dragContent->IsXULElement()) {
// All XUL elements are draggable, so if a XUL element is
// encountered, stop looking for draggable nodes and just use the
// original clicked node instead.
// XXXndeakin
// In the future, we will want to improve this so that XUL has a
// better way to specify whether something is draggable than just
// on/off.
dragContent = mGestureDownContent;
break;
}
// otherwise, it's not an HTML or XUL element, so just keep looking
}
dragContent = dragContent->GetFlattenedTreeParent();
}
}
// if no node in the hierarchy was found to drag, but the GetDragData method
// returned a node, use that returned node. Otherwise, nothing is draggable.
if (!dragContent && dragDataNode) dragContent = dragDataNode;
if (dragContent) {
// if an ancestor node was used instead, clear the drag data
// XXXndeakin rework this a bit. Find a way to just not call GetDragData if
// we don't need to.
if (dragContent != originalDragContent) aDataTransfer->ClearAll();
*aTargetNode = dragContent;
NS_ADDREF(*aTargetNode);
}
}
bool EventStateManager::DoDefaultDragStart(
nsPresContext* aPresContext, WidgetDragEvent* aDragEvent,
DataTransfer* aDataTransfer, bool aAllowEmptyDataTransfer,
nsIContent* aDragTarget, Selection* aSelection,
RemoteDragStartData* aDragStartData, nsIPrincipal* aPrincipal,
nsIContentSecurityPolicy* aCsp, nsICookieJarSettings* aCookieJarSettings) {
nsCOMPtr<nsIDragService> dragService =
do_GetService("@mozilla.org/widget/dragservice;1");
if (!dragService) return false;
// Default handling for the dragstart event.
//
// First, check if a drag session already exists. This means that the drag
// service was called directly within a draggesture handler. In this case,
// don't do anything more, as it is assumed that the handler is managing
// drag and drop manually. Make sure to return true to indicate that a drag
// began. However, if we're handling drag session for synthesized events,
// we need to initialize some information of the session. Therefore, we
// need to keep going for synthesized case.
if (MOZ_UNLIKELY(!mPresContext)) {
return true;
}
nsCOMPtr<nsIDragSession> dragSession =
dragService->GetCurrentSession(mPresContext->GetRootWidget());
if (dragSession && !dragSession->IsSynthesizedForTests()) {
return true;
}
// No drag session is currently active, so check if a handler added
// any items to be dragged. If not, there isn't anything to drag.
uint32_t count = 0;
if (aDataTransfer) {
count = aDataTransfer->MozItemCount();
}
if (!aAllowEmptyDataTransfer && !count) {
return false;
}
// Get the target being dragged, which may not be the same as the
// target of the mouse event. If one wasn't set in the
// aDataTransfer during the event handler, just use the original
// target instead.
nsCOMPtr<nsIContent> dragTarget = aDataTransfer->GetDragTarget();
if (!dragTarget) {
dragTarget = aDragTarget;
if (!dragTarget) {
return false;
}
}
// check which drag effect should initially be used. If the effect was not
// set, just use all actions, otherwise Windows won't allow a drop.
uint32_t action = aDataTransfer->EffectAllowedInt();
if (action == nsIDragService::DRAGDROP_ACTION_UNINITIALIZED) {
action = nsIDragService::DRAGDROP_ACTION_COPY |
nsIDragService::DRAGDROP_ACTION_MOVE |
nsIDragService::DRAGDROP_ACTION_LINK;
}
// get any custom drag image that was set
int32_t imageX, imageY;
RefPtr<Element> dragImage = aDataTransfer->GetDragImage(&imageX, &imageY);
nsCOMPtr<nsIArray> transArray = aDataTransfer->GetTransferables(dragTarget);
if (!transArray) {
return false;
}
RefPtr<DataTransfer> dataTransfer;
if (!dragSession) {
// After this function returns, the DataTransfer will be cleared so it
// appears empty to content. We need to pass a DataTransfer into the Drag
// Session, so we need to make a copy.
aDataTransfer->Clone(aDragTarget, eDrop, aDataTransfer->MozUserCancelled(),
false, getter_AddRefs(dataTransfer));
// Copy over the drop effect, as Clone doesn't copy it for us.
dataTransfer->SetDropEffectInt(aDataTransfer->DropEffectInt());
} else {
MOZ_ASSERT(dragSession->IsSynthesizedForTests());
MOZ_ASSERT(aDragEvent->mFlags.mIsSynthesizedForTests);
// If we're initializing synthesized drag session, we should use given
// DataTransfer as is because it'll be used with following drag events
// in any tests, therefore it should be set to nsIDragSession.dataTransfer
// because it and DragEvent.dataTransfer should be same instance.
dataTransfer = aDataTransfer;
}
// XXXndeakin don't really want to create a new drag DOM event
// here, but we need something to pass to the InvokeDragSession
// methods.
RefPtr<DragEvent> event =
NS_NewDOMDragEvent(dragTarget, aPresContext, aDragEvent);
// Use InvokeDragSessionWithSelection if a selection is being dragged,
// such that the image can be generated from the selected text. However,
// use InvokeDragSessionWithImage if a custom image was set or something
// other than a selection is being dragged.
if (!dragImage && aSelection) {
dragService->InvokeDragSessionWithSelection(
aSelection, aPrincipal, aCsp, aCookieJarSettings, transArray, action,
event, dataTransfer, dragTarget);
} else if (aDragStartData) {
MOZ_ASSERT(XRE_IsParentProcess());
dragService->InvokeDragSessionWithRemoteImage(
dragTarget, aPrincipal, aCsp, aCookieJarSettings, transArray, action,
aDragStartData, event, dataTransfer);
} else {
dragService->InvokeDragSessionWithImage(
dragTarget, aPrincipal, aCsp, aCookieJarSettings, transArray, action,
dragImage, imageX, imageY, event, dataTransfer);
}
return true;
}
void EventStateManager::ChangeZoom(bool aIncrease) {
// Send the zoom change to the top level browser so it will be handled by the
// front end in the same way as other zoom actions.
nsIDocShell* docShell = mDocument->GetDocShell();
if (!docShell) {
return;
}
BrowsingContext* bc = docShell->GetBrowsingContext();
if (!bc) {
return;
}
if (XRE_IsParentProcess()) {
bc->Canonical()->DispatchWheelZoomChange(aIncrease);
} else if (BrowserChild* child = BrowserChild::GetFrom(docShell)) {
child->SendWheelZoomChange(aIncrease);
}
}
void EventStateManager::DoScrollHistory(int32_t direction) {
nsCOMPtr<nsISupports> pcContainer(mPresContext->GetContainerWeak());
if (pcContainer) {
nsCOMPtr<nsIWebNavigation> webNav(do_QueryInterface(pcContainer));
if (webNav) {
// positive direction to go back one step, nonpositive to go forward
// This is doing user-initiated history traversal, hence we want
// to require that history entries we navigate to have user interaction.
if (direction > 0)
webNav->GoBack(StaticPrefs::browser_navigation_requireUserInteraction(),
true);
else
webNav->GoForward(
StaticPrefs::browser_navigation_requireUserInteraction(), true);
}
}
}
void EventStateManager::DoScrollZoom(nsIFrame* aTargetFrame,
int32_t adjustment) {
// Exclude content in chrome docshells.
nsIContent* content = aTargetFrame->GetContent();
if (content && !nsContentUtils::IsInChromeDocshell(content->OwnerDoc())) {
// Positive adjustment to decrease zoom, negative to increase
const bool increase = adjustment <= 0;
EnsureDocument(mPresContext);
ChangeZoom(increase);
}
}
static nsIFrame* GetParentFrameToScroll(nsIFrame* aFrame) {
if (!aFrame) return nullptr;
if (aFrame->StyleDisplay()->mPosition == StylePositionProperty::Fixed &&
nsLayoutUtils::IsReallyFixedPos(aFrame)) {
return aFrame->PresShell()->GetRootScrollContainerFrame();
}
return aFrame->GetParent();
}
void EventStateManager::DispatchLegacyMouseScrollEvents(
nsIFrame* aTargetFrame, WidgetWheelEvent* aEvent, nsEventStatus* aStatus) {
MOZ_ASSERT(aEvent);
MOZ_ASSERT(aStatus);
if (!aTargetFrame || *aStatus == nsEventStatus_eConsumeNoDefault) {
return;
}
// Ignore mouse wheel transaction for computing legacy mouse wheel
// events' delta value.
// DOM event's delta vales are computed from CSS pixels.
auto scrollAmountInCSSPixels =
CSSIntSize::FromAppUnitsRounded(aEvent->mScrollAmount);
// XXX We don't deal with fractional amount in legacy event, though the
// default action handler (DoScrollText()) deals with it.
// If we implemented such strict computation, we would need additional
// accumulated delta values. It would made the code more complicated.
// And also it would computes different delta values from older version.
// It doesn't make sense to implement such code for legacy events and
// rare cases.
int32_t scrollDeltaX, scrollDeltaY, pixelDeltaX, pixelDeltaY;
switch (aEvent->mDeltaMode) {
case WheelEvent_Binding::DOM_DELTA_PAGE:
scrollDeltaX = !aEvent->mLineOrPageDeltaX
? 0
: (aEvent->mLineOrPageDeltaX > 0
? UIEvent_Binding::SCROLL_PAGE_DOWN
: UIEvent_Binding::SCROLL_PAGE_UP);
scrollDeltaY = !aEvent->mLineOrPageDeltaY
? 0
: (aEvent->mLineOrPageDeltaY > 0
? UIEvent_Binding::SCROLL_PAGE_DOWN
: UIEvent_Binding::SCROLL_PAGE_UP);
pixelDeltaX = RoundDown(aEvent->mDeltaX * scrollAmountInCSSPixels.width);
pixelDeltaY = RoundDown(aEvent->mDeltaY * scrollAmountInCSSPixels.height);
break;
case WheelEvent_Binding::DOM_DELTA_LINE:
scrollDeltaX = aEvent->mLineOrPageDeltaX;
scrollDeltaY = aEvent->mLineOrPageDeltaY;
pixelDeltaX = RoundDown(aEvent->mDeltaX * scrollAmountInCSSPixels.width);
pixelDeltaY = RoundDown(aEvent->mDeltaY * scrollAmountInCSSPixels.height);
break;
case WheelEvent_Binding::DOM_DELTA_PIXEL:
scrollDeltaX = aEvent->mLineOrPageDeltaX;
scrollDeltaY = aEvent->mLineOrPageDeltaY;
pixelDeltaX = RoundDown(aEvent->mDeltaX);
pixelDeltaY = RoundDown(aEvent->mDeltaY);
break;
default:
MOZ_CRASH("Invalid deltaMode value comes");
}
// Send the legacy events in following order:
// 1. Vertical scroll
// 2. Vertical pixel scroll (even if #1 isn't consumed)
// 3. Horizontal scroll (even if #1 and/or #2 are consumed)
// 4. Horizontal pixel scroll (even if #3 isn't consumed)
AutoWeakFrame targetFrame(aTargetFrame);
MOZ_ASSERT(*aStatus != nsEventStatus_eConsumeNoDefault &&
!aEvent->DefaultPrevented(),
"If you make legacy events dispatched for default prevented wheel "
"event, you need to initialize stateX and stateY");
EventState stateX, stateY;
if (scrollDeltaY) {
SendLineScrollEvent(aTargetFrame, aEvent, stateY, scrollDeltaY,
DELTA_DIRECTION_Y);
if (!targetFrame.IsAlive()) {
*aStatus = nsEventStatus_eConsumeNoDefault;
return;
}
}
if (pixelDeltaY) {
SendPixelScrollEvent(aTargetFrame, aEvent, stateY, pixelDeltaY,
DELTA_DIRECTION_Y);
if (!targetFrame.IsAlive()) {
*aStatus = nsEventStatus_eConsumeNoDefault;
return;
}
}
if (scrollDeltaX) {
SendLineScrollEvent(aTargetFrame, aEvent, stateX, scrollDeltaX,
DELTA_DIRECTION_X);
if (!targetFrame.IsAlive()) {
*aStatus = nsEventStatus_eConsumeNoDefault;
return;
}
}
if (pixelDeltaX) {
SendPixelScrollEvent(aTargetFrame, aEvent, stateX, pixelDeltaX,
DELTA_DIRECTION_X);
if (!targetFrame.IsAlive()) {
*aStatus = nsEventStatus_eConsumeNoDefault;
return;
}
}
if (stateY.mDefaultPrevented) {
*aStatus = nsEventStatus_eConsumeNoDefault;
aEvent->PreventDefault(!stateY.mDefaultPreventedByContent);
}
if (stateX.mDefaultPrevented) {
*aStatus = nsEventStatus_eConsumeNoDefault;
aEvent->PreventDefault(!stateX.mDefaultPreventedByContent);
}
}
void EventStateManager::SendLineScrollEvent(nsIFrame* aTargetFrame,
WidgetWheelEvent* aEvent,
EventState& aState, int32_t aDelta,
DeltaDirection aDeltaDirection) {
nsCOMPtr<nsIContent> targetContent = aTargetFrame->GetContent();
if (!targetContent) {
targetContent = GetFocusedElement();
if (!targetContent) {
return;
}
}
while (targetContent->IsText()) {
targetContent = targetContent->GetFlattenedTreeParent();
}
WidgetMouseScrollEvent event(aEvent->IsTrusted(),
eLegacyMouseLineOrPageScroll, aEvent->mWidget);
event.mFlags.mDefaultPrevented = aState.mDefaultPrevented;
event.mFlags.mDefaultPreventedByContent = aState.mDefaultPreventedByContent;
event.mRefPoint = aEvent->mRefPoint;
event.mTimeStamp = aEvent->mTimeStamp;
event.mModifiers = aEvent->mModifiers;
event.mButtons = aEvent->mButtons;
event.mIsHorizontal = (aDeltaDirection == DELTA_DIRECTION_X);
event.mDelta = aDelta;
event.mInputSource = aEvent->mInputSource;
RefPtr<nsPresContext> presContext = aTargetFrame->PresContext();
nsEventStatus status = nsEventStatus_eIgnore;
EventDispatcher::Dispatch(targetContent, presContext, &event, nullptr,
&status);
aState.mDefaultPrevented =
event.DefaultPrevented() || status == nsEventStatus_eConsumeNoDefault;
aState.mDefaultPreventedByContent = event.DefaultPreventedByContent();
}
void EventStateManager::SendPixelScrollEvent(nsIFrame* aTargetFrame,
WidgetWheelEvent* aEvent,
EventState& aState,
int32_t aPixelDelta,
DeltaDirection aDeltaDirection) {
nsCOMPtr<nsIContent> targetContent = aTargetFrame->GetContent();
if (!targetContent) {
targetContent = GetFocusedElement();
if (!targetContent) {
return;
}
}
while (targetContent->IsText()) {
targetContent = targetContent->GetFlattenedTreeParent();
}
WidgetMouseScrollEvent event(aEvent->IsTrusted(), eLegacyMousePixelScroll,
aEvent->mWidget);
event.mFlags.mDefaultPrevented = aState.mDefaultPrevented;
event.mFlags.mDefaultPreventedByContent = aState.mDefaultPreventedByContent;
event.mRefPoint = aEvent->mRefPoint;
event.mTimeStamp = aEvent->mTimeStamp;
event.mModifiers = aEvent->mModifiers;
event.mButtons = aEvent->mButtons;
event.mIsHorizontal = (aDeltaDirection == DELTA_DIRECTION_X);
event.mDelta = aPixelDelta;
event.mInputSource = aEvent->mInputSource;
RefPtr<nsPresContext> presContext = aTargetFrame->PresContext();
nsEventStatus status = nsEventStatus_eIgnore;
EventDispatcher::Dispatch(targetContent, presContext, &event, nullptr,
&status);
aState.mDefaultPrevented =
event.DefaultPrevented() || status == nsEventStatus_eConsumeNoDefault;
aState.mDefaultPreventedByContent = event.DefaultPreventedByContent();
}
ScrollContainerFrame*
EventStateManager::ComputeScrollTargetAndMayAdjustWheelEvent(
nsIFrame* aTargetFrame, WidgetWheelEvent* aEvent,
ComputeScrollTargetOptions aOptions) {
return ComputeScrollTargetAndMayAdjustWheelEvent(
aTargetFrame, aEvent->mDeltaX, aEvent->mDeltaY, aEvent, aOptions);
}
// Overload ComputeScrollTargetAndMayAdjustWheelEvent method to allow passing
// "test" dx and dy when looking for which scrollbarmediators to activate when
// two finger down on trackpad and before any actual motion
ScrollContainerFrame*
EventStateManager::ComputeScrollTargetAndMayAdjustWheelEvent(
nsIFrame* aTargetFrame, double aDirectionX, double aDirectionY,
WidgetWheelEvent* aEvent, ComputeScrollTargetOptions aOptions) {
bool isAutoDir = false;
bool honoursRoot = false;
if (MAY_BE_ADJUSTED_BY_AUTO_DIR & aOptions) {
// If the scroll is respected as auto-dir, aDirection* should always be
// equivalent to the event's delta vlaues(Currently, there are only one case
// where aDirection*s have different values from the widget wheel event's
// original delta values and the only case isn't auto-dir, see
// ScrollbarsForWheel::TemporarilyActivateAllPossibleScrollTargets).
MOZ_ASSERT(aDirectionX == aEvent->mDeltaX &&
aDirectionY == aEvent->mDeltaY);
WheelDeltaAdjustmentStrategy strategy =
GetWheelDeltaAdjustmentStrategy(*aEvent);
switch (strategy) {
case WheelDeltaAdjustmentStrategy::eAutoDir:
isAutoDir = true;
honoursRoot = false;
break;
case WheelDeltaAdjustmentStrategy::eAutoDirWithRootHonour:
isAutoDir = true;
honoursRoot = true;
break;
default:
break;
}
}
if (aOptions & PREFER_MOUSE_WHEEL_TRANSACTION) {
// If the user recently scrolled with the mousewheel, then they probably
// want to scroll the same view as before instead of the view under the
// cursor. WheelTransaction tracks the frame currently being
// scrolled with the mousewheel. We consider the transaction ended when the
// mouse moves more than "mousewheel.transaction.ignoremovedelay"
// milliseconds after the last scroll operation, or any time the mouse moves
// out of the frame, or when more than "mousewheel.transaction.timeout"
// milliseconds have passed after the last operation, even if the mouse
// hasn't moved.
nsIFrame* lastScrollFrame = WheelTransaction::GetScrollTargetFrame();
if (lastScrollFrame) {
ScrollContainerFrame* scrollContainerFrame =
lastScrollFrame->GetScrollTargetFrame();
if (scrollContainerFrame) {
if (isAutoDir) {
ESMAutoDirWheelDeltaAdjuster adjuster(*aEvent, *lastScrollFrame,
honoursRoot);
// Note that calling this function will not always cause the delta to
// be adjusted, it only adjusts the delta when it should, because
// Adjust() internally calls ShouldBeAdjusted() before making
// adjustment.
adjuster.Adjust();
}
return scrollContainerFrame;
}
}
}
// If the event doesn't cause scroll actually, we cannot find scroll target
// because we check if the event can cause scroll actually on each found
// scrollable frame.
if (!aDirectionX && !aDirectionY) {
return nullptr;
}
bool checkIfScrollableX;
bool checkIfScrollableY;
if (isAutoDir) {
// Always check the frame's scrollability in both the two directions for an
// auto-dir scroll. That is, for an auto-dir scroll,
// PREFER_ACTUAL_SCROLLABLE_TARGET_ALONG_X_AXIS and
// PREFER_ACTUAL_SCROLLABLE_TARGET_ALONG_Y_AXIS should be ignored.
checkIfScrollableX = true;
checkIfScrollableY = true;
} else {
checkIfScrollableX =
aDirectionX &&
(aOptions & PREFER_ACTUAL_SCROLLABLE_TARGET_ALONG_X_AXIS);
checkIfScrollableY =
aDirectionY &&
(aOptions & PREFER_ACTUAL_SCROLLABLE_TARGET_ALONG_Y_AXIS);
}
nsIFrame* scrollFrame = !(aOptions & START_FROM_PARENT)
? aTargetFrame
: GetParentFrameToScroll(aTargetFrame);
for (; scrollFrame; scrollFrame = GetParentFrameToScroll(scrollFrame)) {
// Check whether the frame wants to provide us with a scrollable view.
ScrollContainerFrame* scrollContainerFrame =
scrollFrame->GetScrollTargetFrame();
if (!scrollContainerFrame) {
nsMenuPopupFrame* menuPopupFrame = do_QueryFrame(scrollFrame);
if (menuPopupFrame) {
return nullptr;
}
continue;
}
if (!checkIfScrollableX && !checkIfScrollableY) {
return scrollContainerFrame;
}
// If the frame disregards the direction the user is trying to scroll, then
// it should just bubbles the scroll event up to its parental scroll frame
Maybe<layers::ScrollDirection> disregardedDirection =
WheelHandlingUtils::GetDisregardedWheelScrollDirection(scrollFrame);
if (disregardedDirection) {
switch (disregardedDirection.ref()) {
case layers::ScrollDirection::eHorizontal:
if (checkIfScrollableX) {
continue;
}
break;
case layers::ScrollDirection::eVertical:
if (checkIfScrollableY) {
continue;
}
break;
}
}
layers::ScrollDirections directions =
scrollContainerFrame
->GetAvailableScrollingDirectionsForUserInputEvents();
if ((!(directions.contains(layers::ScrollDirection::eVertical)) &&
!(directions.contains(layers::ScrollDirection::eHorizontal))) ||
(checkIfScrollableY && !checkIfScrollableX &&
!(directions.contains(layers::ScrollDirection::eVertical))) ||
(checkIfScrollableX && !checkIfScrollableY &&
!(directions.contains(layers::ScrollDirection::eHorizontal)))) {
continue;
}
// Computes whether the currently checked frame is scrollable by this wheel
// event.
bool canScroll = false;
if (isAutoDir) {
ESMAutoDirWheelDeltaAdjuster adjuster(*aEvent, *scrollFrame, honoursRoot);
if (adjuster.ShouldBeAdjusted()) {
adjuster.Adjust();
canScroll = true;
} else if (WheelHandlingUtils::CanScrollOn(scrollContainerFrame,
aDirectionX, aDirectionY)) {
canScroll = true;
}
} else if (WheelHandlingUtils::CanScrollOn(scrollContainerFrame,
aDirectionX, aDirectionY)) {
canScroll = true;
}
if (canScroll) {
return scrollContainerFrame;
}
// Where we are at is the block ending in a for loop.
// The current frame has been checked to be unscrollable by this wheel
// event, continue the loop to check its parent, if any.
}
nsIFrame* newFrame = nsLayoutUtils::GetCrossDocParentFrameInProcess(
aTargetFrame->PresShell()->GetRootFrame());
aOptions =
static_cast<ComputeScrollTargetOptions>(aOptions & ~START_FROM_PARENT);
if (!newFrame) {
return nullptr;
}
return ComputeScrollTargetAndMayAdjustWheelEvent(newFrame, aEvent, aOptions);
}
nsSize EventStateManager::GetScrollAmount(
nsPresContext* aPresContext, WidgetWheelEvent* aEvent,
ScrollContainerFrame* aScrollContainerFrame) {
MOZ_ASSERT(aPresContext);
MOZ_ASSERT(aEvent);
const bool isPage = aEvent->mDeltaMode == WheelEvent_Binding::DOM_DELTA_PAGE;
if (!aScrollContainerFrame) {
// If there is no scrollable frame, we should use root, see below.
aScrollContainerFrame =
aPresContext->PresShell()->GetRootScrollContainerFrame();
}
if (aScrollContainerFrame) {
return isPage ? aScrollContainerFrame->GetPageScrollAmount()
: aScrollContainerFrame->GetLineScrollAmount();
}
// If there is no scrollable frame and page scrolling, use viewport size.
if (isPage) {
return aPresContext->GetVisibleArea().Size();
}
// Otherwise use root frame's font metrics.
//
// FIXME(emilio): Should this use the root element's style frame? The root
// frame will always have the initial font. Then again it should never matter
// for content, we should always have a root scrollable frame in html
// documents.
nsIFrame* rootFrame = aPresContext->PresShell()->GetRootFrame();
if (!rootFrame) {
return nsSize(0, 0);
}
RefPtr<nsFontMetrics> fm =
nsLayoutUtils::GetInflatedFontMetricsForFrame(rootFrame);
NS_ENSURE_TRUE(fm, nsSize(0, 0));
return nsSize(fm->AveCharWidth(), fm->MaxHeight());
}
void EventStateManager::DoScrollText(
ScrollContainerFrame* aScrollContainerFrame, WidgetWheelEvent* aEvent) {
MOZ_ASSERT(aScrollContainerFrame);
MOZ_ASSERT(aEvent);
AutoWeakFrame scrollFrameWeak(aScrollContainerFrame);
AutoWeakFrame eventFrameWeak(mCurrentTarget);
if (!WheelTransaction::WillHandleDefaultAction(aEvent, scrollFrameWeak,
eventFrameWeak)) {
return;
}
// Default action's actual scroll amount should be computed from device
// pixels.
nsPresContext* pc = aScrollContainerFrame->PresContext();
nsSize scrollAmount = GetScrollAmount(pc, aEvent, aScrollContainerFrame);
nsIntSize scrollAmountInDevPixels(
pc->AppUnitsToDevPixels(scrollAmount.width),
pc->AppUnitsToDevPixels(scrollAmount.height));
nsIntPoint actualDevPixelScrollAmount =
DeltaAccumulator::GetInstance()->ComputeScrollAmountForDefaultAction(
aEvent, scrollAmountInDevPixels);
// Don't scroll around the axis whose overflow style is hidden.
ScrollStyles overflowStyle = aScrollContainerFrame->GetScrollStyles();
if (overflowStyle.mHorizontal == StyleOverflow::Hidden) {
actualDevPixelScrollAmount.x = 0;
}
if (overflowStyle.mVertical == StyleOverflow::Hidden) {
actualDevPixelScrollAmount.y = 0;
}
ScrollSnapFlags snapFlags = ScrollSnapFlags::Disabled;
mozilla::ScrollOrigin origin = mozilla::ScrollOrigin::NotSpecified;
switch (aEvent->mDeltaMode) {
case WheelEvent_Binding::DOM_DELTA_LINE:
origin = mozilla::ScrollOrigin::MouseWheel;
snapFlags = ScrollSnapFlags::IntendedDirection;
break;
case WheelEvent_Binding::DOM_DELTA_PAGE:
origin = mozilla::ScrollOrigin::Pages;
snapFlags = ScrollSnapFlags::IntendedDirection |
ScrollSnapFlags::IntendedEndPosition;
break;
case WheelEvent_Binding::DOM_DELTA_PIXEL:
origin = mozilla::ScrollOrigin::Pixels;
break;
default:
MOZ_CRASH("Invalid deltaMode value comes");
}
// We shouldn't scroll more one page at once except when over one page scroll
// is allowed for the event.
nsSize pageSize = aScrollContainerFrame->GetPageScrollAmount();
nsIntSize devPixelPageSize(pc->AppUnitsToDevPixels(pageSize.width),
pc->AppUnitsToDevPixels(pageSize.height));
if (!WheelPrefs::GetInstance()->IsOverOnePageScrollAllowedX(aEvent) &&
DeprecatedAbs(actualDevPixelScrollAmount.x.value) >
devPixelPageSize.width) {
actualDevPixelScrollAmount.x = (actualDevPixelScrollAmount.x >= 0)
? devPixelPageSize.width
: -devPixelPageSize.width;
}
if (!WheelPrefs::GetInstance()->IsOverOnePageScrollAllowedY(aEvent) &&
DeprecatedAbs(actualDevPixelScrollAmount.y.value) >
devPixelPageSize.height) {
actualDevPixelScrollAmount.y = (actualDevPixelScrollAmount.y >= 0)
? devPixelPageSize.height
: -devPixelPageSize.height;
}
bool isDeltaModePixel =
(aEvent->mDeltaMode == WheelEvent_Binding::DOM_DELTA_PIXEL);
ScrollMode mode;
switch (aEvent->mScrollType) {
case WidgetWheelEvent::SCROLL_DEFAULT:
if (isDeltaModePixel) {
mode = ScrollMode::Normal;
} else if (aEvent->mFlags.mHandledByAPZ) {
mode = ScrollMode::SmoothMsd;
} else {
mode = ScrollMode::Smooth;
}
break;
case WidgetWheelEvent::SCROLL_SYNCHRONOUSLY:
mode = ScrollMode::Instant;
break;
case WidgetWheelEvent::SCROLL_ASYNCHRONOUSLY:
mode = ScrollMode::Normal;
break;
case WidgetWheelEvent::SCROLL_SMOOTHLY:
mode = ScrollMode::Smooth;
break;
default:
MOZ_CRASH("Invalid mScrollType value comes");
}
ScrollContainerFrame::ScrollMomentum momentum =
aEvent->mIsMomentum ? ScrollContainerFrame::SYNTHESIZED_MOMENTUM_EVENT
: ScrollContainerFrame::NOT_MOMENTUM;
nsIntPoint overflow;
aScrollContainerFrame->ScrollBy(actualDevPixelScrollAmount,
ScrollUnit::DEVICE_PIXELS, mode, &overflow,
origin, momentum, snapFlags);
if (!scrollFrameWeak.IsAlive()) {
// If the scroll causes changing the layout, we can think that the event
// has been completely consumed by the content. Then, users probably don't
// want additional action.
aEvent->mOverflowDeltaX = aEvent->mOverflowDeltaY = 0;
} else if (isDeltaModePixel) {
aEvent->mOverflowDeltaX = overflow.x;
aEvent->mOverflowDeltaY = overflow.y;
} else {
aEvent->mOverflowDeltaX =
static_cast<double>(overflow.x) / scrollAmountInDevPixels.width;
aEvent->mOverflowDeltaY =
static_cast<double>(overflow.y) / scrollAmountInDevPixels.height;
}
// If CSS overflow properties caused not to scroll, the overflowDelta* values
// should be same as delta* values since they may be used as gesture event by
// widget. However, if there is another scrollable element in the ancestor
// along the axis, probably users don't want the operation to cause
// additional action such as moving history. In such case, overflowDelta
// values should stay zero.
if (scrollFrameWeak.IsAlive()) {
if (aEvent->mDeltaX && overflowStyle.mHorizontal == StyleOverflow::Hidden &&
!ComputeScrollTargetAndMayAdjustWheelEvent(
aScrollContainerFrame, aEvent,
COMPUTE_SCROLLABLE_ANCESTOR_ALONG_X_AXIS_WITH_AUTO_DIR)) {
aEvent->mOverflowDeltaX = aEvent->mDeltaX;
}
if (aEvent->mDeltaY && overflowStyle.mVertical == StyleOverflow::Hidden &&
!ComputeScrollTargetAndMayAdjustWheelEvent(
aScrollContainerFrame, aEvent,
COMPUTE_SCROLLABLE_ANCESTOR_ALONG_Y_AXIS_WITH_AUTO_DIR)) {
aEvent->mOverflowDeltaY = aEvent->mDeltaY;
}
}
NS_ASSERTION(
aEvent->mOverflowDeltaX == 0 ||
(aEvent->mOverflowDeltaX > 0) == (aEvent->mDeltaX > 0),
"The sign of mOverflowDeltaX is different from the scroll direction");
NS_ASSERTION(
aEvent->mOverflowDeltaY == 0 ||
(aEvent->mOverflowDeltaY > 0) == (aEvent->mDeltaY > 0),
"The sign of mOverflowDeltaY is different from the scroll direction");
WheelPrefs::GetInstance()->CancelApplyingUserPrefsFromOverflowDelta(aEvent);
}
void EventStateManager::DecideGestureEvent(WidgetGestureNotifyEvent* aEvent,
nsIFrame* targetFrame) {
NS_ASSERTION(aEvent->mMessage == eGestureNotify,
"DecideGestureEvent called with a non-gesture event");
/* Check the ancestor tree to decide if any frame is willing* to receive
* a MozPixelScroll event. If that's the case, the current touch gesture
* will be used as a pan gesture; otherwise it will be a regular
* mousedown/mousemove/click event.
*
* *willing: determine if it makes sense to pan the element using scroll
* events:
* - For web content: if there are any visible scrollbars on the touch point
* - For XUL: if it's an scrollable element that can currently scroll in some
* direction.
*
* Note: we'll have to one-off various cases to ensure a good usable behavior
*/
WidgetGestureNotifyEvent::PanDirection panDirection =
WidgetGestureNotifyEvent::ePanNone;
bool displayPanFeedback = false;
for (nsIFrame* current = targetFrame; current;
current = nsLayoutUtils::GetCrossDocParentFrame(current)) {
// e10s - mark remote content as pannable. This is a work around since
// we don't have access to remote frame scroll info here. Apz data may
// assist is solving this.
if (current && IsTopLevelRemoteTarget(current->GetContent())) {
panDirection = WidgetGestureNotifyEvent::ePanBoth;
// We don't know when we reach bounds, so just disable feedback for now.
displayPanFeedback = false;
break;
}
LayoutFrameType currentFrameType = current->Type();
// Scrollbars should always be draggable
if (currentFrameType == LayoutFrameType::Scrollbar) {
panDirection = WidgetGestureNotifyEvent::ePanNone;
break;
}
// Special check for trees
if (nsTreeBodyFrame* treeFrame = do_QueryFrame(current)) {
if (treeFrame->GetVerticalOverflow()) {
panDirection = WidgetGestureNotifyEvent::ePanVertical;
}
break;
}
if (ScrollContainerFrame* scrollContainerFrame = do_QueryFrame(current)) {
layers::ScrollDirections scrollbarVisibility =
scrollContainerFrame->GetScrollbarVisibility();
// Check if we have visible scrollbars
if (scrollbarVisibility.contains(layers::ScrollDirection::eVertical)) {
panDirection = WidgetGestureNotifyEvent::ePanVertical;
displayPanFeedback = true;
break;
}
if (scrollbarVisibility.contains(layers::ScrollDirection::eHorizontal)) {
panDirection = WidgetGestureNotifyEvent::ePanHorizontal;
displayPanFeedback = true;
}
}
} // ancestor chain
aEvent->mDisplayPanFeedback = displayPanFeedback;
aEvent->mPanDirection = panDirection;
}
#ifdef XP_MACOSX
static nsINode* GetCrossDocParentNode(nsINode* aChild) {
MOZ_ASSERT(aChild, "The child is null!");
MOZ_ASSERT(XRE_IsParentProcess());
nsINode* parent = aChild->GetParentNode();
if (parent && parent->IsContent() && aChild->IsContent()) {
parent = aChild->AsContent()->GetFlattenedTreeParent();
}
if (parent || !aChild->IsDocument()) {
return parent;
}
return aChild->AsDocument()->GetEmbedderElement();
}
static bool NodeAllowsClickThrough(nsINode* aNode) {
while (aNode) {
if (aNode->IsAnyOfXULElements(nsGkAtoms::browser, nsGkAtoms::tree)) {
return false;
}
if (aNode->IsAnyOfXULElements(nsGkAtoms::scrollbar, nsGkAtoms::resizer)) {
return true;
}
aNode = GetCrossDocParentNode(aNode);
}
return true;
}
#endif
void EventStateManager::PostHandleKeyboardEvent(
WidgetKeyboardEvent* aKeyboardEvent, nsIFrame* aTargetFrame,
nsEventStatus& aStatus) {
if (aStatus == nsEventStatus_eConsumeNoDefault) {
return;
}
RefPtr<nsPresContext> presContext = mPresContext;
if (!aKeyboardEvent->HasBeenPostedToRemoteProcess()) {
if (aKeyboardEvent->IsWaitingReplyFromRemoteProcess()) {
RefPtr<BrowserParent> remote =
aTargetFrame ? BrowserParent::GetFrom(aTargetFrame->GetContent())
: nullptr;
if (remote) {
// remote is null-checked above in order to let pre-existing event
// targeting code's chrome vs. content decision override in case of
// disagreement in order not to disrupt non-Fission e10s mode in case
// there are still bugs in the Fission-mode code. That is, if remote
// is nullptr, the pre-existing event targeting code has deemed this
// event to belong to chrome rather than content.
BrowserParent* preciseRemote = BrowserParent::GetFocused();
if (preciseRemote) {
remote = preciseRemote;
}
// else there was a race between layout and focus tracking
}
if (remote && !remote->IsReadyToHandleInputEvents()) {
// We need to dispatch the event to the browser element again if we were
// waiting for the key reply but the event wasn't sent to the content
// process due to the remote browser wasn't ready.
WidgetKeyboardEvent keyEvent(*aKeyboardEvent);
aKeyboardEvent->MarkAsHandledInRemoteProcess();
RefPtr<Element> ownerElement = remote->GetOwnerElement();
EventDispatcher::Dispatch(ownerElement, presContext, &keyEvent);
if (keyEvent.DefaultPrevented()) {
aKeyboardEvent->PreventDefault(!keyEvent.DefaultPreventedByContent());
aStatus = nsEventStatus_eConsumeNoDefault;
return;
}
}
}
// The widget expects a reply for every keyboard event. If the event wasn't
// dispatched to a content process (non-e10s or no content process
// running), we need to short-circuit here. Otherwise, we need to wait for
// the content process to handle the event.
if (aKeyboardEvent->mWidget) {
aKeyboardEvent->mWidget->PostHandleKeyEvent(aKeyboardEvent);
}
if (aKeyboardEvent->DefaultPrevented()) {
aStatus = nsEventStatus_eConsumeNoDefault;
return;
}
}
// XXX Currently, our automated tests don't support mKeyNameIndex.
// Therefore, we still need to handle this with keyCode.
switch (aKeyboardEvent->mKeyCode) {
case NS_VK_TAB:
case NS_VK_F6:
// This is to prevent keyboard scrolling while alt modifier in use.
if (!aKeyboardEvent->IsAlt()) {
aStatus = nsEventStatus_eConsumeNoDefault;
// Handling the tab event after it was sent to content is bad,
// because to the FocusManager the remote-browser looks like one
// element, so we would just move the focus to the next element
// in chrome, instead of handling it in content.
if (aKeyboardEvent->HasBeenPostedToRemoteProcess()) {
break;
}
EnsureDocument(presContext);
nsFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm && mDocument) {
// Shift focus forward or back depending on shift key
bool isDocMove = aKeyboardEvent->IsControl() ||
aKeyboardEvent->mKeyCode == NS_VK_F6;
uint32_t dir =
aKeyboardEvent->IsShift()
? (isDocMove ? static_cast<uint32_t>(
nsIFocusManager::MOVEFOCUS_BACKWARDDOC)
: static_cast<uint32_t>(
nsIFocusManager::MOVEFOCUS_BACKWARD))
: (isDocMove ? static_cast<uint32_t>(
nsIFocusManager::MOVEFOCUS_FORWARDDOC)
: static_cast<uint32_t>(
nsIFocusManager::MOVEFOCUS_FORWARD));
RefPtr<Element> result;
fm->MoveFocus(mDocument->GetWindow(), nullptr, dir,
nsIFocusManager::FLAG_BYKEY, getter_AddRefs(result));
}
}
return;
case 0:
// We handle keys with no specific keycode value below.
break;
default:
return;
}
switch (aKeyboardEvent->mKeyNameIndex) {
case KEY_NAME_INDEX_ZoomIn:
case KEY_NAME_INDEX_ZoomOut:
ChangeZoom(aKeyboardEvent->mKeyNameIndex == KEY_NAME_INDEX_ZoomIn);
aStatus = nsEventStatus_eConsumeNoDefault;
break;
default:
break;
}
}
static bool NeedsActiveContentChange(const WidgetMouseEvent* aMouseEvent) {
// If the mouse event is a synthesized mouse event due to a touch, do
// not set/clear the activation state. Element activation is handled by APZ.
return !aMouseEvent ||
aMouseEvent->mInputSource != MouseEvent_Binding::MOZ_SOURCE_TOUCH;
}
nsresult EventStateManager::PostHandleEvent(nsPresContext* aPresContext,
WidgetEvent* aEvent,
nsIFrame* aTargetFrame,
nsEventStatus* aStatus,
nsIContent* aOverrideClickTarget) {
AUTO_PROFILER_LABEL("EventStateManager::PostHandleEvent", DOM);
NS_ENSURE_ARG(aPresContext);
NS_ENSURE_ARG_POINTER(aStatus);
mCurrentTarget = aTargetFrame;
mCurrentTargetContent = nullptr;
HandleCrossProcessEvent(aEvent, aStatus);
// NOTE: the above call may have destroyed aTargetFrame, please use
// mCurrentTarget henceforth. This is to avoid using it accidentally:
aTargetFrame = nullptr;
// Most of the events we handle below require a frame.
// Add special cases here.
if (!mCurrentTarget && aEvent->mMessage != eMouseUp &&
aEvent->mMessage != eMouseDown && aEvent->mMessage != eDragEnter &&
aEvent->mMessage != eDragOver && aEvent->mMessage != ePointerUp &&
aEvent->mMessage != ePointerCancel) {
return NS_OK;
}
// Keep the prescontext alive, we might need it after event dispatch
RefPtr<nsPresContext> presContext = aPresContext;
nsresult ret = NS_OK;
switch (aEvent->mMessage) {
case eMouseDown: {
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
if (mouseEvent->mButton == MouseButton::ePrimary &&
!sNormalLMouseEventInProcess) {
// We got a mouseup event while a mousedown event was being processed.
// Make sure that the capturing content is cleared.
PresShell::ReleaseCapturingContent();
break;
}
// For remote content, capture the event in the parent process at the
// <xul:browser remote> element. This will ensure that subsequent
// mousemove/mouseup events will continue to be dispatched to this element
// and therefore forwarded to the child.
if (aEvent->HasBeenPostedToRemoteProcess() &&
!PresShell::GetCapturingContent()) {
if (nsIContent* content =
mCurrentTarget ? mCurrentTarget->GetContent() : nullptr) {
PresShell::SetCapturingContent(content, CaptureFlags::None, aEvent);
} else {
PresShell::ReleaseCapturingContent();
}
}
// If MouseEvent::PreventClickEvent() was called by chrome script,
// we need to forget the clicking content and click count for the
// following eMouseUp event.
if (mouseEvent->mClickEventPrevented) {
switch (mouseEvent->mButton) {
case MouseButton::ePrimary:
case MouseButton::eSecondary:
case MouseButton::eMiddle: {
LastMouseDownInfo& mouseDownInfo =
GetLastMouseDownInfo(mouseEvent->mButton);
mouseDownInfo.mLastMouseDownContent = nullptr;
mouseDownInfo.mClickCount = 0;
mouseDownInfo.mLastMouseDownInputControlType = Nothing();
break;
}
default:
break;
}
}
nsCOMPtr<nsIContent> activeContent;
// When content calls PreventDefault on pointerdown, we also call
// PreventDefault on the subsequent mouse events to suppress default
// behaviors. Normally, aStatus should be nsEventStatus_eConsumeNoDefault
// when the event is DefaultPrevented but it's reset to
// nsEventStatus_eIgnore in EventStateManager::PreHandleEvent. So we also
// check if the event is DefaultPrevented.
if (nsEventStatus_eConsumeNoDefault != *aStatus &&
!aEvent->DefaultPrevented()) {
nsCOMPtr<nsIContent> newFocus;
bool suppressBlur = false;
if (mCurrentTarget) {
newFocus = mCurrentTarget->GetContentForEvent(aEvent);
activeContent = mCurrentTarget->GetContent();
// In some cases, we do not want to even blur the current focused
// element. Those cases are:
// 1. -moz-user-focus CSS property is set to 'ignore';
// 2. XUL control element has the disabled property set to 'true'.
//
// We can't use nsIFrame::IsFocusable() because we want to blur when
// we click on a visibility: none element.
// We can't use nsIContent::IsFocusable() because we want to blur when
// we click on a non-focusable element like a <div>.
// We have to use |aEvent->mTarget| to not make sure we do not check
// an anonymous node of the targeted element.
suppressBlur =
mCurrentTarget->StyleUI()->UserFocus() == StyleUserFocus::Ignore;
if (!suppressBlur) {
if (Element* element =
Element::FromEventTargetOrNull(aEvent->mTarget)) {
if (nsCOMPtr<nsIDOMXULControlElement> xulControl =
element->AsXULControl()) {
bool disabled = false;
xulControl->GetDisabled(&disabled);
suppressBlur = disabled;
}
}
}
}
// When a root content which isn't editable but has an editable HTML
// <body> element is clicked, we should redirect the focus to the
// the <body> element. E.g., when an user click bottom of the editor
// where is outside of the <body> element, the <body> should be focused
// and the user can edit immediately after that.
//
// NOTE: The newFocus isn't editable that also means it's not in
// designMode. In designMode, all contents are not focusable.
if (newFocus && !newFocus->IsEditable()) {
Document* doc = newFocus->GetComposedDoc();
if (doc && newFocus == doc->GetRootElement()) {
nsIContent* bodyContent =
nsLayoutUtils::GetEditableRootContentByContentEditable(doc);
if (bodyContent && bodyContent->GetPrimaryFrame()) {
newFocus = bodyContent;
}
}
}
// When the mouse is pressed, the default action is to focus the
// target. Look for the nearest enclosing focusable frame.
//
// TODO: Probably this should be moved to Element::PostHandleEvent.
for (; newFocus; newFocus = newFocus->GetFlattenedTreeParent()) {
if (!newFocus->IsElement()) {
continue;
}
nsIFrame* frame = newFocus->GetPrimaryFrame();
if (!frame) {
continue;
}
// If the mousedown happened inside a popup, don't try to set focus on
// one of its containing elements
if (frame->IsMenuPopupFrame()) {
newFocus = nullptr;
break;
}
auto flags = IsFocusableFlags::WithMouse;
if (frame->IsFocusable(flags)) {
break;
}
if (ShadowRoot* root = newFocus->GetShadowRoot()) {
if (root->DelegatesFocus()) {
if (Element* firstFocusable = root->GetFocusDelegate(flags)) {
newFocus = firstFocusable;
break;
}
}
}
}
MOZ_ASSERT_IF(newFocus, newFocus->IsElement());
if (RefPtr<nsFocusManager> fm = nsFocusManager::GetFocusManager()) {
// if something was found to focus, focus it. Otherwise, if the
// element that was clicked doesn't have -moz-user-focus: ignore,
// clear the existing focus. For -moz-user-focus: ignore, the focus
// is just left as is.
// Another effect of mouse clicking, handled in Selection, is that
// it should update the caret position to where the mouse was
// clicked. Because the focus is cleared when clicking on a
// non-focusable node, the next press of the tab key will cause
// focus to be shifted from the caret position instead of the root.
if (newFocus) {
// use the mouse flag and the noscroll flag so that the content
// doesn't unexpectedly scroll when clicking an element that is
// only half visible
uint32_t flags =
nsIFocusManager::FLAG_BYMOUSE | nsIFocusManager::FLAG_NOSCROLL;
// If this was a touch-generated event, pass that information:
if (mouseEvent->mInputSource ==
MouseEvent_Binding::MOZ_SOURCE_TOUCH) {
flags |= nsIFocusManager::FLAG_BYTOUCH;
}
fm->SetFocus(MOZ_KnownLive(newFocus->AsElement()), flags);
} else if (!suppressBlur) {
// clear the focus within the frame and then set it as the
// focused frame
EnsureDocument(mPresContext);
if (mDocument) {
nsCOMPtr<nsPIDOMWindowOuter> outerWindow = mDocument->GetWindow();
#ifdef XP_MACOSX
if (!activeContent || !activeContent->IsXULElement())
#endif
fm->ClearFocus(outerWindow);
// Prevent switch frame if we're already not in the foreground tab
// and we're in a content process.
// TODO: If we were inactive frame in this tab, and now in
// background tab, we shouldn't make the tab foreground, but
// we should set focus to clicked document in the background
// tab. However, nsFocusManager does not have proper method
// for doing this. Therefore, we should skip setting focus
// to clicked document for now.
if (XRE_IsParentProcess() || IsInActiveTab(mDocument)) {
fm->SetFocusedWindow(outerWindow);
}
}
}
}
// The rest is left button-specific.
if (mouseEvent->mButton != MouseButton::ePrimary) {
break;
}
// The nearest enclosing element goes into the :active state. If we're
// not an element (so we're text or something) we need to obtain
// our parent element and put it into :active instead.
if (activeContent && !activeContent->IsElement()) {
if (nsIContent* par = activeContent->GetFlattenedTreeParent()) {
activeContent = par;
}
}
} else {
// if we're here, the event handler returned false, so stop
// any of our own processing of a drag. Workaround for bug 43258.
StopTrackingDragGesture(true);
}
// XXX Why do we always set this is active? Active window may be changed
// by a mousedown event listener.
if (NeedsActiveContentChange(mouseEvent)) {
SetActiveManager(this, activeContent);
}
} break;
case ePointerCancel:
case ePointerUp: {
WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent();
MOZ_ASSERT(pointerEvent);
// Implicitly releasing capture for given pointer. ePointerLostCapture
// should be send after ePointerUp or ePointerCancel.
PointerEventHandler::ImplicitlyReleasePointerCapture(pointerEvent);
PointerEventHandler::UpdateActivePointerState(pointerEvent);
if (
// After pointercancel, pointer becomes invalid so we can remove
// relevant helper from table.
pointerEvent->mMessage == ePointerCancel ||
// pointerup for non-hoverable pointer needs to dispatch pointerout
// and pointerleave events because the pointer is valid only while the
// pointer is "down".
!pointerEvent->InputSourceSupportsHover()) {
GenerateMouseEnterExit(pointerEvent);
mPointersEnterLeaveHelper.Remove(pointerEvent->pointerId);
}
break;
}
case eMouseUp: {
// We can unconditionally stop capturing because
// we should never be capturing when the mouse button is up
PresShell::ReleaseCapturingContent();
WidgetMouseEvent* mouseUpEvent = aEvent->AsMouseEvent();
if (NeedsActiveContentChange(mouseUpEvent)) {
ClearGlobalActiveContent(this);
}
if (mouseUpEvent && EventCausesClickEvents(*mouseUpEvent)) {
// Make sure to dispatch the click even if there is no frame for
// the current target element. This is required for Web compatibility.
RefPtr<EventStateManager> esm =
ESMFromContentOrThis(aOverrideClickTarget);
ret =
esm->PostHandleMouseUp(mouseUpEvent, aStatus, aOverrideClickTarget);
}
if (PresShell* presShell = presContext->GetPresShell()) {
RefPtr<nsFrameSelection> frameSelection = presShell->FrameSelection();
frameSelection->SetDragState(false);
}
} break;
case eWheelOperationEnd: {
MOZ_ASSERT(aEvent->IsTrusted());
ScrollbarsForWheel::MayInactivate();
WidgetWheelEvent* wheelEvent = aEvent->AsWheelEvent();
ScrollContainerFrame* scrollTarget =
ComputeScrollTargetAndMayAdjustWheelEvent(
mCurrentTarget, wheelEvent,
COMPUTE_DEFAULT_ACTION_TARGET_WITH_AUTO_DIR);
// If the wheel event was handled by APZ, APZ will perform the scroll
// snap.
if (scrollTarget && !WheelTransaction::HandledByApz()) {
scrollTarget->ScrollSnap();
}
} break;
case eWheel:
case eWheelOperationStart: {
MOZ_ASSERT(aEvent->IsTrusted());
if (*aStatus == nsEventStatus_eConsumeNoDefault) {
ScrollbarsForWheel::Inactivate();
break;
}
WidgetWheelEvent* wheelEvent = aEvent->AsWheelEvent();
MOZ_ASSERT(wheelEvent);
// When APZ is enabled, the actual scroll animation might be handled by
// the compositor.
WheelPrefs::Action action =
wheelEvent->mFlags.mHandledByAPZ
? WheelPrefs::ACTION_NONE
: WheelPrefs::GetInstance()->ComputeActionFor(wheelEvent);
WheelDeltaAdjustmentStrategy strategy =
GetWheelDeltaAdjustmentStrategy(*wheelEvent);
// Adjust the delta values of the wheel event if the current default
// action is to horizontalize scrolling. I.e., deltaY values are set to
// deltaX and deltaY and deltaZ values are set to 0.
// If horizontalized, the delta values will be restored and its overflow
// deltaX will become 0 when the WheelDeltaHorizontalizer instance is
// being destroyed.
WheelDeltaHorizontalizer horizontalizer(*wheelEvent);
if (WheelDeltaAdjustmentStrategy::eHorizontalize == strategy) {
horizontalizer.Horizontalize();
}
// Since ComputeScrollTargetAndMayAdjustWheelEvent() may adjust the delta
// if the event is auto-dir. So we use |ESMAutoDirWheelDeltaRestorer|
// here.
// An instance of |ESMAutoDirWheelDeltaRestorer| is used to monitor
// auto-dir adjustment which may happen during its lifetime. If the delta
// values is adjusted during its lifetime, the instance will restore the
// adjusted delta when it's being destrcuted.
ESMAutoDirWheelDeltaRestorer restorer(*wheelEvent);
ScrollContainerFrame* scrollTarget =
ComputeScrollTargetAndMayAdjustWheelEvent(
mCurrentTarget, wheelEvent,
COMPUTE_DEFAULT_ACTION_TARGET_WITH_AUTO_DIR);
switch (action) {
case WheelPrefs::ACTION_SCROLL:
case WheelPrefs::ACTION_HORIZONTALIZED_SCROLL: {
// For scrolling of default action, we should honor the mouse wheel
// transaction.
ScrollbarsForWheel::PrepareToScrollText(this, mCurrentTarget,
wheelEvent);
if (aEvent->mMessage != eWheel ||
(!wheelEvent->mDeltaX && !wheelEvent->mDeltaY)) {
break;
}
ScrollbarsForWheel::SetActiveScrollTarget(scrollTarget);
ScrollContainerFrame* rootScrollContainerFrame =
!mCurrentTarget
? nullptr
: mCurrentTarget->PresShell()->GetRootScrollContainerFrame();
if (!scrollTarget || scrollTarget == rootScrollContainerFrame) {
wheelEvent->mViewPortIsOverscrolled = true;
}
wheelEvent->mOverflowDeltaX = wheelEvent->mDeltaX;
wheelEvent->mOverflowDeltaY = wheelEvent->mDeltaY;
WheelPrefs::GetInstance()->CancelApplyingUserPrefsFromOverflowDelta(
wheelEvent);
if (scrollTarget) {
DoScrollText(scrollTarget, wheelEvent);
} else {
WheelTransaction::EndTransaction();
ScrollbarsForWheel::Inactivate();
}
break;
}
case WheelPrefs::ACTION_HISTORY: {
// If this event doesn't cause eLegacyMouseLineOrPageScroll event or
// the direction is oblique, don't perform history back/forward.
int32_t intDelta = wheelEvent->GetPreferredIntDelta();
if (!intDelta) {
break;
}
DoScrollHistory(intDelta);
break;
}
case WheelPrefs::ACTION_ZOOM: {
// If this event doesn't cause eLegacyMouseLineOrPageScroll event or
// the direction is oblique, don't perform zoom in/out.
int32_t intDelta = wheelEvent->GetPreferredIntDelta();
if (!intDelta) {
break;
}
DoScrollZoom(mCurrentTarget, intDelta);
break;
}
case WheelPrefs::ACTION_NONE:
default:
bool allDeltaOverflown = false;
if (StaticPrefs::dom_event_wheel_event_groups_enabled() &&
(wheelEvent->mDeltaX != 0.0 || wheelEvent->mDeltaY != 0.0)) {
if (scrollTarget) {
WheelTransaction::WillHandleDefaultAction(
wheelEvent, scrollTarget, mCurrentTarget);
} else {
WheelTransaction::EndTransaction();
}
}
if (wheelEvent->mFlags.mHandledByAPZ) {
if (wheelEvent->mCanTriggerSwipe) {
// For events that can trigger swipes, APZ needs to know whether
// scrolling is possible in the requested direction. It does this
// by looking at the scroll overflow values on mCanTriggerSwipe
// events after they have been processed.
allDeltaOverflown = !ComputeScrollTarget(
mCurrentTarget, wheelEvent, COMPUTE_DEFAULT_ACTION_TARGET);
}
} else {
// The event was processed neither by APZ nor by us, so all of the
// delta values must be overflown delta values.
allDeltaOverflown = true;
}
if (!allDeltaOverflown) {
break;
}
wheelEvent->mOverflowDeltaX = wheelEvent->mDeltaX;
wheelEvent->mOverflowDeltaY = wheelEvent->mDeltaY;
WheelPrefs::GetInstance()->CancelApplyingUserPrefsFromOverflowDelta(
wheelEvent);
wheelEvent->mViewPortIsOverscrolled = true;
break;
}
*aStatus = nsEventStatus_eConsumeNoDefault;
} break;
case eGestureNotify: {
if (nsEventStatus_eConsumeNoDefault != *aStatus) {
DecideGestureEvent(aEvent->AsGestureNotifyEvent(), mCurrentTarget);
}
} break;
case eDragEnter:
case eDragOver: {
NS_ASSERTION(aEvent->mClass == eDragEventClass, "Expected a drag event");
// Check if the drag is occurring inside a scrollable area. If so, scroll
// the area when the mouse is near the edges.
if (mCurrentTarget && aEvent->mMessage == eDragOver) {
nsIFrame* checkFrame = mCurrentTarget;
while (checkFrame) {
ScrollContainerFrame* scrollFrame = do_QueryFrame(checkFrame);
// Break out so only the innermost scrollframe is scrolled.
if (scrollFrame && scrollFrame->DragScroll(aEvent)) {
break;
}
checkFrame = checkFrame->GetParent();
}
}
nsCOMPtr<nsIDragSession> dragSession =
nsContentUtils::GetDragSession(mPresContext);
if (!dragSession) break;
// Reset the flag.
dragSession->SetOnlyChromeDrop(false);
if (mPresContext) {
EnsureDocument(mPresContext);
}
bool isChromeDoc = nsContentUtils::IsChromeDoc(mDocument);
// the initial dataTransfer is the one from the dragstart event that
// was set on the dragSession when the drag began.
RefPtr<DataTransfer> dataTransfer;
RefPtr<DataTransfer> initialDataTransfer = dragSession->GetDataTransfer();
WidgetDragEvent* dragEvent = aEvent->AsDragEvent();
// collect any changes to moz cursor settings stored in the event's
// data transfer.
UpdateDragDataTransfer(dragEvent);
// cancelling a dragenter or dragover event means that a drop should be
// allowed, so update the dropEffect and the canDrop state to indicate
// that a drag is allowed. If the event isn't cancelled, a drop won't be
// allowed. Essentially, to allow a drop somewhere, specify the effects
// using the effectAllowed and dropEffect properties in a dragenter or
// dragover event and cancel the event. To not allow a drop somewhere,
// don't cancel the event or set the effectAllowed or dropEffect to
// "none". This way, if the event is just ignored, no drop will be
// allowed.
uint32_t dropEffect = nsIDragService::DRAGDROP_ACTION_NONE;
uint32_t action = nsIDragService::DRAGDROP_ACTION_NONE;
if (nsEventStatus_eConsumeNoDefault == *aStatus) {
// If the event has initialized its mDataTransfer, use it.
// Or the event has not been initialized its mDataTransfer, but
// it's set before dispatch because of synthesized, but without
// testing session (e.g., emulating drag from another app), use it
// coming from outside.
// XXX Perhaps, for the latter case, we need new API because we don't
// have a chance to initialize allowed effects of the session.
if (dragEvent->mDataTransfer) {
// get the dataTransfer and the dropEffect that was set on it
dataTransfer = dragEvent->mDataTransfer;
dropEffect = dataTransfer->DropEffectInt();
} else {
// if dragEvent->mDataTransfer is null, it means that no attempt was
// made to access the dataTransfer during the event, yet the event
// was cancelled. Instead, use the initial data transfer available
// from the drag session. The drop effect would not have been
// initialized (which is done in DragEvent::GetDataTransfer),
// so set it from the drag action. We'll still want to filter it
// based on the effectAllowed below.
dataTransfer = initialDataTransfer;
dragSession->GetDragAction(&action);
// filter the drop effect based on the action. Use UNINITIALIZED as
// any effect is allowed.
dropEffect = nsContentUtils::FilterDropEffect(
action, nsIDragService::DRAGDROP_ACTION_UNINITIALIZED);
}
// At this point, if the dataTransfer is null, it means that the
// drag was originally started by directly calling the drag service.
// Just assume that all effects are allowed.
uint32_t effectAllowed = nsIDragService::DRAGDROP_ACTION_UNINITIALIZED;
if (dataTransfer) {
effectAllowed = dataTransfer->EffectAllowedInt();
}
// set the drag action based on the drop effect and effect allowed.
// The drop effect field on the drag transfer object specifies the
// desired current drop effect. However, it cannot be used if the
// effectAllowed state doesn't include that type of action. If the
// dropEffect is "none", then the action will be 'none' so a drop will
// not be allowed.
if (effectAllowed == nsIDragService::DRAGDROP_ACTION_UNINITIALIZED ||
dropEffect & effectAllowed)
action = dropEffect;
if (action == nsIDragService::DRAGDROP_ACTION_NONE)
dropEffect = nsIDragService::DRAGDROP_ACTION_NONE;
// inform the drag session that a drop is allowed on this node.
dragSession->SetDragAction(action);
dragSession->SetCanDrop(action != nsIDragService::DRAGDROP_ACTION_NONE);
// For now, do this only for dragover.
// XXXsmaug dragenter needs some more work.
if (aEvent->mMessage == eDragOver && !isChromeDoc) {
// Someone has called preventDefault(), check whether is was on
// content or chrome.
dragSession->SetOnlyChromeDrop(
!dragEvent->mDefaultPreventedOnContent);
}
} else if (aEvent->mMessage == eDragOver && !isChromeDoc) {
// No one called preventDefault(), so handle drop only in chrome.
dragSession->SetOnlyChromeDrop(true);
}
if (auto* bc = BrowserChild::GetFrom(presContext->GetDocShell())) {
bc->SendUpdateDropEffect(action, dropEffect);
}
if (aEvent->HasBeenPostedToRemoteProcess()) {
dragSession->SetCanDrop(true);
} else if (initialDataTransfer) {
// Now set the drop effect in the initial dataTransfer. This ensures
// that we can get the desired drop effect in the drop event. For events
// dispatched to content, the content process will take care of setting
// this.
initialDataTransfer->SetDropEffectInt(dropEffect);
}
} break;
case eDrop: {
if (aEvent->mFlags.mIsSynthesizedForTests) {
nsCOMPtr<nsIDragService> dragService =
do_GetService("@mozilla.org/widget/dragservice;1");
nsCOMPtr<nsIDragSession> dragSession =
nsContentUtils::GetDragSession(mPresContext);
if (dragSession && dragService &&
!dragService->GetNeverAllowSessionIsSynthesizedForTests()) {
MOZ_ASSERT(dragSession->IsSynthesizedForTests());
RefPtr<WindowContext> sourceWC;
DebugOnly<nsresult> rvIgnored =
dragSession->GetSourceWindowContext(getter_AddRefs(sourceWC));
NS_WARNING_ASSERTION(
NS_SUCCEEDED(rvIgnored),
"nsIDragSession::GetSourceDocument() failed, but ignored");
// If the drag source hasn't been initialized, i.e., dragstart was
// consumed by the test, the test needs to dispatch "dragend" event
// instead of the drag session. Therefore, it does not make sense
// to set drag end point in such case (you hit assersion if you do
// it).
if (sourceWC) {
const CSSIntPoint dropPointInScreen = RoundedToInt(
Event::GetScreenCoords(aPresContext, aEvent, aEvent->mRefPoint)
.extract());
dragSession->SetDragEndPointForTests(dropPointInScreen.x,
dropPointInScreen.y);
}
}
}
sLastDragOverFrame = nullptr;
ClearGlobalActiveContent(this);
break;
}
case eDragExit: {
// make sure to fire the enter and exit_synth events after the
// eDragExit event, otherwise we'll clean up too early
GenerateDragDropEnterExit(presContext, aEvent->AsDragEvent());
if (auto* bc = BrowserChild::GetFrom(presContext->GetDocShell())) {
// SendUpdateDropEffect to prevent nsIDragService from waiting for
// response of forwarded dragexit event.
bc->SendUpdateDropEffect(nsIDragService::DRAGDROP_ACTION_NONE,
nsIDragService::DRAGDROP_ACTION_NONE);
}
break;
}
case eKeyUp:
// If space key is released, we need to inactivate the element which was
// activated by preceding space key down.
// XXX Currently, we don't store the reason of activation. Therefore,
// this may cancel what is activated by a mousedown, but it must not
// cause actual problem in web apps in the wild since it must be
// rare case that users release space key during a mouse click/drag.
if (aEvent->AsKeyboardEvent()->ShouldWorkAsSpaceKey()) {
ClearGlobalActiveContent(this);
}
break;
case eKeyPress: {
WidgetKeyboardEvent* keyEvent = aEvent->AsKeyboardEvent();
PostHandleKeyboardEvent(keyEvent, mCurrentTarget, *aStatus);
} break;
case eMouseEnterIntoWidget:
if (mCurrentTarget) {
nsCOMPtr<nsIContent> targetContent =
mCurrentTarget->GetContentForEvent(aEvent);
SetContentState(targetContent, ElementState::HOVER);
}
break;
case eMouseExitFromWidget:
PointerEventHandler::UpdateActivePointerState(aEvent->AsMouseEvent());
break;
#ifdef XP_MACOSX
case eMouseActivate:
if (mCurrentTarget) {
nsCOMPtr<nsIContent> targetContent =
mCurrentTarget->GetContentForEvent(aEvent);
if (!NodeAllowsClickThrough(targetContent)) {
*aStatus = nsEventStatus_eConsumeNoDefault;
}
}
break;
#endif
default:
break;
}
// Reset target frame to null to avoid mistargeting after reentrant event
mCurrentTarget = nullptr;
mCurrentTargetContent = nullptr;
return ret;
}
BrowserParent* EventStateManager::GetCrossProcessTarget() {
return IMEStateManager::GetActiveBrowserParent();
}
bool EventStateManager::IsTargetCrossProcess(WidgetGUIEvent* aEvent) {
// Check to see if there is a focused, editable content in chrome,
// in that case, do not forward IME events to content
Element* focusedElement = GetFocusedElement();
if (focusedElement && focusedElement->IsEditable()) {
return false;
}
return IMEStateManager::GetActiveBrowserParent() != nullptr;
}
void EventStateManager::NotifyDestroyPresContext(nsPresContext* aPresContext) {
RefPtr<nsPresContext> presContext = aPresContext;
if (presContext) {
IMEStateManager::OnDestroyPresContext(*presContext);
}
// Bug 70855: Presentation is going away, possibly for a reframe.
// Reset the hover state so that if we're recreating the presentation,
// we won't have the old hover state still set in the new presentation,
// as if the new presentation is resized, a new element may be hovered.
ResetHoverState();
mMouseEnterLeaveHelper = nullptr;
mPointersEnterLeaveHelper.Clear();
PointerEventHandler::NotifyDestroyPresContext(presContext);
}
void EventStateManager::ResetHoverState() {
if (mHoverContent) {
SetContentState(nullptr, ElementState::HOVER);
}
}
void EventStateManager::SetPresContext(nsPresContext* aPresContext) {
mPresContext = aPresContext;
}
void EventStateManager::ClearFrameRefs(nsIFrame* aFrame) {
if (aFrame && aFrame == mCurrentTarget) {
mCurrentTargetContent = aFrame->GetContent();
}
}
struct CursorImage {
gfx::IntPoint mHotspot;
nsCOMPtr<imgIContainer> mContainer;
ImageResolution mResolution;
bool mEarlierCursorLoading = false;
};
// Given the event that we're processing, and the computed cursor and hotspot,
// determine whether the custom CSS cursor should be blocked (that is, not
// honored).
//
// We will not honor it all of the following are true:
//
// * the size of the custom cursor is bigger than layout.cursor.block.max-size.
// * the bounds of the cursor would end up outside of the viewport of the
// top-level content document.
//
// This is done in order to prevent hijacking the cursor, see bug 1445844 and
// co.
static bool ShouldBlockCustomCursor(nsPresContext* aPresContext,
WidgetEvent* aEvent,
const CursorImage& aCursor) {
int32_t width = 0;
int32_t height = 0;
aCursor.mContainer->GetWidth(&width);
aCursor.mContainer->GetHeight(&height);
aCursor.mResolution.ApplyTo(width, height);
int32_t maxSize = StaticPrefs::layout_cursor_block_max_size();
if (width <= maxSize && height <= maxSize) {
return false;
}
auto input = DOMIntersectionObserver::ComputeInput(*aPresContext->Document(),
nullptr, nullptr);
if (!input.mRootFrame) {
return false;
}
nsPoint point = nsLayoutUtils::GetEventCoordinatesRelativeTo(
aEvent, RelativeTo{input.mRootFrame});
// The cursor size won't be affected by our full zoom in the parent process,
// so undo that before checking the rect.
float zoom = aPresContext->GetFullZoom();
// Also adjust for accessibility cursor scaling factor.
zoom /= LookAndFeel::GetFloat(LookAndFeel::FloatID::CursorScale, 1.0f);
nsSize size(CSSPixel::ToAppUnits(width / zoom),
CSSPixel::ToAppUnits(height / zoom));
nsPoint hotspot(
CSSPixel::ToAppUnits(ViewAs<CSSPixel>(aCursor.mHotspot.x / zoom)),
CSSPixel::ToAppUnits(ViewAs<CSSPixel>(aCursor.mHotspot.y / zoom)));
const nsRect cursorRect(point - hotspot, size);
auto output = DOMIntersectionObserver::Intersect(input, cursorRect);
return !output.mIntersectionRect ||
!(*output.mIntersectionRect == cursorRect);
}
static gfx::IntPoint ComputeHotspot(imgIContainer* aContainer,
const Maybe<gfx::Point>& aHotspot) {
MOZ_ASSERT(aContainer);
// css3-ui says to use the CSS-specified hotspot if present,
// otherwise use the intrinsic hotspot, otherwise use the top left
// corner.
if (aHotspot) {
int32_t imgWidth, imgHeight;
aContainer->GetWidth(&imgWidth);
aContainer->GetHeight(&imgHeight);
auto hotspot = gfx::IntPoint::Round(*aHotspot);
return {std::max(std::min(hotspot.x.value, imgWidth - 1), 0),
std::max(std::min(hotspot.y.value, imgHeight - 1), 0)};
}
gfx::IntPoint hotspot;
aContainer->GetHotspotX(&hotspot.x.value);
aContainer->GetHotspotY(&hotspot.y.value);
return hotspot;
}
static CursorImage ComputeCustomCursor(nsPresContext* aPresContext,
WidgetEvent* aEvent,
const nsIFrame& aFrame,
const nsIFrame::Cursor& aCursor) {
if (aCursor.mAllowCustomCursor == nsIFrame::AllowCustomCursorImage::No) {
return {};
}
const ComputedStyle& style =
aCursor.mStyle ? *aCursor.mStyle : *aFrame.Style();
// If we are falling back because any cursor before us is loading, let the
// consumer know.
bool loading = false;
for (const auto& image : style.StyleUI()->Cursor().images.AsSpan()) {
MOZ_ASSERT(image.image.IsImageRequestType(),
"Cursor image should only parse url() types");
uint32_t status;
imgRequestProxy* req = image.image.GetImageRequest();
if (!req || NS_FAILED(req->GetImageStatus(&status))) {
continue;
}
if (!(status & imgIRequest::STATUS_LOAD_COMPLETE)) {
loading = true;
continue;
}
if (status & imgIRequest::STATUS_ERROR) {
continue;
}
nsCOMPtr<imgIContainer> container;
req->GetImage(getter_AddRefs(container));
if (!container) {
continue;
}
StyleImageOrientation orientation =
aFrame.StyleVisibility()->UsedImageOrientation(req);
container = nsLayoutUtils::OrientImage(container, orientation);
Maybe<gfx::Point> specifiedHotspot =
image.has_hotspot ? Some(gfx::Point{image.hotspot_x, image.hotspot_y})
: Nothing();
gfx::IntPoint hotspot = ComputeHotspot(container, specifiedHotspot);
CursorImage result{hotspot, std::move(container),
image.image.GetResolution(style), loading};
if (ShouldBlockCustomCursor(aPresContext, aEvent, result)) {
continue;
}
// This is the one we want!
return result;
}
return {{}, nullptr, {}, loading};
}
void EventStateManager::UpdateCursor(nsPresContext* aPresContext,
WidgetMouseEvent* aEvent,
nsIFrame* aTargetFrame,
nsEventStatus* aStatus) {
// XXX This is still not entirely correct, e.g. when mouse hover over the
// broder of a cross-origin iframe, we should show the cursor specified on the
// iframe (see bug 1943530).
if (nsSubDocumentFrame* f = do_QueryFrame(aTargetFrame)) {
if (auto* fl = f->FrameLoader();
fl && fl->IsRemoteFrame() && f->ContentReactsToPointerEvents()) {
// The sub-frame will update the cursor if needed.
return;
}
}
auto cursor = StyleCursorKind::Default;
nsCOMPtr<imgIContainer> container;
ImageResolution resolution;
Maybe<gfx::IntPoint> hotspot;
if (mHidingCursorWhileTyping && aEvent->IsReal()) {
// Any non-synthetic mouse event makes us show the cursor again.
mHidingCursorWhileTyping = false;
}
if (mHidingCursorWhileTyping) {
cursor = StyleCursorKind::None;
} else if (mLockCursor != kInvalidCursorKind) {
// If cursor is locked just use the locked one
cursor = mLockCursor;
} else if (aTargetFrame) {
// If not locked, look for correct cursor
nsPoint pt = nsLayoutUtils::GetEventCoordinatesRelativeTo(
aEvent, RelativeTo{aTargetFrame});
const nsIFrame::Cursor framecursor = aTargetFrame->GetCursor(pt);
const CursorImage customCursor =
ComputeCustomCursor(aPresContext, aEvent, *aTargetFrame, framecursor);
// If the current cursor is from the same frame, and it is now
// loading some new image for the cursor, we should wait for a
// while rather than taking its fallback cursor directly.
if (customCursor.mEarlierCursorLoading &&
gLastCursorSourceFrame == aTargetFrame &&
TimeStamp::NowLoRes() - gLastCursorUpdateTime <
TimeDuration::FromMilliseconds(kCursorLoadingTimeout)) {
return;
}
cursor = framecursor.mCursor;
container = std::move(customCursor.mContainer);
resolution = customCursor.mResolution;
hotspot = Some(customCursor.mHotspot);
}
if (aTargetFrame) {
if (cursor == StyleCursorKind::Pointer && IsSelectingLink(aTargetFrame)) {
cursor = aTargetFrame->GetWritingMode().IsVertical()
? StyleCursorKind::VerticalText
: StyleCursorKind::Text;
}
SetCursor(cursor, container, resolution, hotspot,
aTargetFrame->GetNearestWidget(), false);
gLastCursorSourceFrame = aTargetFrame;
gLastCursorUpdateTime = TimeStamp::NowLoRes();
}
if (mLockCursor != kInvalidCursorKind || StyleCursorKind::Auto != cursor) {
*aStatus = nsEventStatus_eConsumeDoDefault;
}
}
void EventStateManager::ClearCachedWidgetCursor(nsIFrame* aTargetFrame) {
if (!aTargetFrame) {
return;
}
nsIWidget* aWidget = aTargetFrame->GetNearestWidget();
if (!aWidget) {
return;
}
aWidget->ClearCachedCursor();
}
void EventStateManager::StartHidingCursorWhileTyping(nsIWidget* aWidget) {
if (mHidingCursorWhileTyping || sCursorSettingManager != this) {
return;
}
mHidingCursorWhileTyping = true;
SetCursor(StyleCursorKind::None, nullptr, {}, {}, aWidget, false);
}
nsresult EventStateManager::SetCursor(StyleCursorKind aCursor,
imgIContainer* aContainer,
const ImageResolution& aResolution,
const Maybe<gfx::IntPoint>& aHotspot,
nsIWidget* aWidget, bool aLockCursor) {
EnsureDocument(mPresContext);
NS_ENSURE_TRUE(mDocument, NS_ERROR_FAILURE);
sCursorSettingManager = this;
NS_ENSURE_TRUE(aWidget, NS_ERROR_FAILURE);
if (aLockCursor) {
if (StyleCursorKind::Auto != aCursor) {
mLockCursor = aCursor;
} else {
// If cursor style is set to auto we unlock the cursor again.
mLockCursor = kInvalidCursorKind;
}
}
nsCursor c;
switch (aCursor) {
case StyleCursorKind::Auto:
case StyleCursorKind::Default:
c = eCursor_standard;
break;
case StyleCursorKind::Pointer:
c = eCursor_hyperlink;
break;
case StyleCursorKind::Crosshair:
c = eCursor_crosshair;
break;
case StyleCursorKind::Move:
c = eCursor_move;
break;
case StyleCursorKind::Text:
c = eCursor_select;
break;
case StyleCursorKind::Wait:
c = eCursor_wait;
break;
case StyleCursorKind::Help:
c = eCursor_help;
break;
case StyleCursorKind::NResize:
c = eCursor_n_resize;
break;
case StyleCursorKind::SResize:
c = eCursor_s_resize;
break;
case StyleCursorKind::WResize:
c = eCursor_w_resize;
break;
case StyleCursorKind::EResize:
c = eCursor_e_resize;
break;
case StyleCursorKind::NwResize:
c = eCursor_nw_resize;
break;
case StyleCursorKind::SeResize:
c = eCursor_se_resize;
break;
case StyleCursorKind::NeResize:
c = eCursor_ne_resize;
break;
case StyleCursorKind::SwResize:
c = eCursor_sw_resize;
break;
case StyleCursorKind::Copy: // CSS3
c = eCursor_copy;
break;
case StyleCursorKind::Alias:
c = eCursor_alias;
break;
case StyleCursorKind::ContextMenu:
c = eCursor_context_menu;
break;
case StyleCursorKind::Cell:
c = eCursor_cell;
break;
case StyleCursorKind::Grab:
c = eCursor_grab;
break;
case StyleCursorKind::Grabbing:
c = eCursor_grabbing;
break;
case StyleCursorKind::Progress:
c = eCursor_spinning;
break;
case StyleCursorKind::ZoomIn:
c = eCursor_zoom_in;
break;
case StyleCursorKind::ZoomOut:
c = eCursor_zoom_out;
break;
case StyleCursorKind::NotAllowed:
c = eCursor_not_allowed;
break;
case StyleCursorKind::ColResize:
c = eCursor_col_resize;
break;
case StyleCursorKind::RowResize:
c = eCursor_row_resize;
break;
case StyleCursorKind::NoDrop:
c = eCursor_no_drop;
break;
case StyleCursorKind::VerticalText:
c = eCursor_vertical_text;
break;
case StyleCursorKind::AllScroll:
c = eCursor_all_scroll;
break;
case StyleCursorKind::NeswResize:
c = eCursor_nesw_resize;
break;
case StyleCursorKind::NwseResize:
c = eCursor_nwse_resize;
break;
case StyleCursorKind::NsResize:
c = eCursor_ns_resize;
break;
case StyleCursorKind::EwResize:
c = eCursor_ew_resize;
break;
case StyleCursorKind::None:
c = eCursor_none;
break;
default:
MOZ_ASSERT_UNREACHABLE("Unknown cursor kind");
c = eCursor_standard;
break;
}
uint32_t x = aHotspot ? aHotspot->x.value : 0;
uint32_t y = aHotspot ? aHotspot->y.value : 0;
aWidget->SetCursor(nsIWidget::Cursor{c, aContainer, x, y, aResolution});
return NS_OK;
}
bool EventStateManager::CursorSettingManagerHasLockedCursor() {
return sCursorSettingManager &&
sCursorSettingManager->mLockCursor != kInvalidCursorKind;
}
class MOZ_STACK_CLASS ESMEventCB : public EventDispatchingCallback {
public:
explicit ESMEventCB(nsIContent* aTarget) : mTarget(aTarget) {}
MOZ_CAN_RUN_SCRIPT
void HandleEvent(EventChainPostVisitor& aVisitor) override {
if (aVisitor.mPresContext) {
nsIFrame* frame = aVisitor.mPresContext->GetPrimaryFrameFor(mTarget);
if (frame) {
frame->HandleEvent(aVisitor.mPresContext, aVisitor.mEvent->AsGUIEvent(),
&aVisitor.mEventStatus);
}
}
}
nsCOMPtr<nsIContent> mTarget;
};
static UniquePtr<WidgetMouseEvent> CreateMouseOrPointerWidgetEvent(
WidgetMouseEvent* aMouseEvent, EventMessage aMessage,
EventTarget* aRelatedTarget) {
// This method does not support creating a mouse/pointer button change event
// because of no data about the changing state.
MOZ_ASSERT(aMessage != eMouseDown);
MOZ_ASSERT(aMessage != eMouseUp);
MOZ_ASSERT(aMessage != ePointerDown);
MOZ_ASSERT(aMessage != ePointerUp);
// This method is currently designed to create the following events.
MOZ_ASSERT(aMessage == eMouseOver || aMessage == eMouseEnter ||
aMessage == eMouseOut || aMessage == eMouseLeave ||
aMessage == ePointerOver || aMessage == ePointerEnter ||
aMessage == ePointerOut || aMessage == ePointerLeave ||
aMessage == eMouseEnterIntoWidget ||
aMessage == eMouseExitFromWidget);
WidgetPointerEvent* sourcePointer = aMouseEvent->AsPointerEvent();
UniquePtr<WidgetMouseEvent> newEvent;
if (sourcePointer) {
AUTO_PROFILER_LABEL("CreateMouseOrPointerWidgetEvent", OTHER);
WidgetPointerEvent* newPointerEvent = new WidgetPointerEvent(
aMouseEvent->IsTrusted(), aMessage, aMouseEvent->mWidget);
newPointerEvent->mIsPrimary = sourcePointer->mIsPrimary;
newPointerEvent->mWidth = sourcePointer->mWidth;
newPointerEvent->mHeight = sourcePointer->mHeight;
newPointerEvent->mInputSource = sourcePointer->mInputSource;
newEvent = WrapUnique(newPointerEvent);
} else {
newEvent = MakeUnique<WidgetMouseEvent>(aMouseEvent->IsTrusted(), aMessage,
aMouseEvent->mWidget,
WidgetMouseEvent::eReal);
}
// Inherit whether the event is synthesized by the test API or not.
// Then, when the event is synthesized by a test API and handled in a remote
// process, it won't be ignored. See PresShell::HandleEvent().
newEvent->mFlags.mIsSynthesizedForTests =
aMouseEvent->mFlags.mIsSynthesizedForTests;
newEvent->mRelatedTarget = aRelatedTarget;
newEvent->mRefPoint = aMouseEvent->mRefPoint;
newEvent->mModifiers = aMouseEvent->mModifiers;
// NOTE: If you need to change this if-expression, you need to update
// WidgetMouseEventBase::ComputeMouseButtonPressure() too.
if (!aMouseEvent->mFlags.mDispatchedAtLeastOnce &&
aMouseEvent->InputSourceSupportsHover()) {
// If we synthesize a pointer event or a mouse event from another event
// which changes a button state whose input soucre supports hover state and
// the source event has not been dispatched yet, we should set to the button
// state of the synthesizing event to previous one.
// Note that we don't need to do this if the input source does not support
// hover state because a WPT check the behavior (see below) and the other
// browsers pass the test even though this is inconsistent behavior.
newEvent->mButton =
sourcePointer ? MouseButton::eNotPressed : MouseButton::ePrimary;
if (aMouseEvent->IsPressingButton()) {
// If the source event has not been dispatched into the DOM yet, we
// need to remove the flag which is being pressed.
newEvent->mButtons = static_cast<decltype(WidgetMouseEvent::mButtons)>(
aMouseEvent->mButtons &
~MouseButtonsFlagToChange(
static_cast<MouseButton>(aMouseEvent->mButton)));
} else if (aMouseEvent->IsReleasingButton()) {
// If the source event has not been dispatched into the DOM yet, we
// need to add the flag which is being released.
newEvent->mButtons = static_cast<decltype(WidgetMouseEvent::mButtons)>(
aMouseEvent->mButtons |
MouseButtonsFlagToChange(
static_cast<MouseButton>(aMouseEvent->mButton)));
} else {
// The source event does not change the buttons state so that we can
// set mButtons value as-is.
newEvent->mButtons = aMouseEvent->mButtons;
}
// Adjust pressure if it does not matches with mButtons.
// FIXME: We may use wrong pressure value if the source event has not been
// dispatched into the DOM yet. However, fixing this requires to store the
// last pressure value somewhere (bug 1953669).
newEvent->mPressure = newEvent->ComputeMouseButtonPressure();
} else {
// If the event has already been dispatched into the tree, web apps has
// already handled the button state change, so the button state of the
// source event has already synced.
// If the input source does not have hover state, we don't need to modify
// the state because the other browsers behave so and tested by
// pointerevent_attributes_nohover_pointers.html even though this is
// different expectation from
// pointerevent_attributes_hoverable_pointers.html, but the other browsers
// pass both of them.
newEvent->mButton = aMouseEvent->mButton;
newEvent->mButtons = aMouseEvent->mButtons;
newEvent->mPressure = aMouseEvent->mPressure;
}
newEvent->mInputSource = aMouseEvent->mInputSource;
newEvent->pointerId = aMouseEvent->pointerId;
return newEvent;
}
already_AddRefed<nsIWidget>
EventStateManager::DispatchMouseOrPointerBoundaryEvent(
WidgetMouseEvent* aMouseEvent, EventMessage aMessage,
nsIContent* aTargetContent, nsIContent* aRelatedContent) {
MOZ_ASSERT(aMessage == eMouseEnter || aMessage == ePointerEnter ||
aMessage == eMouseLeave || aMessage == ePointerLeave ||
aMessage == eMouseOver || aMessage == ePointerOver ||
aMessage == eMouseOut || aMessage == ePointerOut);
// "[Once in the locked state...E]vents that require the concept
// of a mouse cursor must not be dispatched (for example: mouseover,
// mouseout...).
// XXXedgar should we also block pointer events?
if (PointerLockManager::IsLocked() &&
(aMessage == eMouseLeave || aMessage == eMouseEnter ||
aMessage == eMouseOver || aMessage == eMouseOut)) {
mCurrentTargetContent = nullptr;
nsCOMPtr<Element> pointerLockedElement =
PointerLockManager::GetLockedElement();
if (!pointerLockedElement) {
NS_WARNING("Should have pointer locked element, but didn't.");
return nullptr;
}
nsIFrame* const pointerLockedFrame =
mPresContext->GetPrimaryFrameFor(pointerLockedElement);
if (NS_WARN_IF(!pointerLockedFrame)) {
return nullptr;
}
return do_AddRef(pointerLockedFrame->GetNearestWidget());
}
mCurrentTargetContent = nullptr;
if (!aTargetContent) {
return nullptr;
}
// Store the widget before dispatching the event because some event listeners
// of the dispatching event may cause reframe the target or remove the target
// from the tree.
nsCOMPtr<nsIWidget> targetWidget;
if (nsIFrame* const targetFrame =
mPresContext->GetPrimaryFrameFor(aTargetContent)) {
targetWidget = targetFrame->GetNearestWidget();
}
nsCOMPtr<nsIContent> targetContent = aTargetContent;
nsCOMPtr<nsIContent> relatedContent = aRelatedContent;
UniquePtr<WidgetMouseEvent> dispatchEvent =
CreateMouseOrPointerWidgetEvent(aMouseEvent, aMessage, relatedContent);
AutoWeakFrame previousTarget = mCurrentTarget;
mCurrentTargetContent = targetContent;
nsEventStatus status = nsEventStatus_eIgnore;
ESMEventCB callback(targetContent);
RefPtr<nsPresContext> presContext = mPresContext;
EventDispatcher::Dispatch(targetContent, presContext, dispatchEvent.get(),
nullptr, &status, &callback);
if (mPresContext) {
// If we are entering/leaving remote content, dispatch a mouse enter/exit
// event to the remote frame.
if (IsTopLevelRemoteTarget(targetContent)) {
if (aMessage == eMouseOut) {
// For remote content, send a puppet widget mouse exit event.
UniquePtr<WidgetMouseEvent> remoteEvent =
CreateMouseOrPointerWidgetEvent(aMouseEvent, eMouseExitFromWidget,
relatedContent);
remoteEvent->mExitFrom = Some(WidgetMouseEvent::ePuppet);
// mCurrentTarget is set to the new target, so we must reset it to the
// old target and then dispatch a cross-process event. (mCurrentTarget
// will be set back below.) HandleCrossProcessEvent will query for the
// proper target via GetEventTarget which will return mCurrentTarget.
mCurrentTarget = mPresContext->GetPrimaryFrameFor(targetContent);
HandleCrossProcessEvent(remoteEvent.get(), &status);
} else if (aMessage == eMouseOver) {
UniquePtr<WidgetMouseEvent> remoteEvent =
CreateMouseOrPointerWidgetEvent(aMouseEvent, eMouseEnterIntoWidget,
relatedContent);
HandleCrossProcessEvent(remoteEvent.get(), &status);
}
}
}
mCurrentTargetContent = nullptr;
mCurrentTarget = previousTarget;
return targetWidget.forget();
}
static nsIContent* FindCommonAncestor(nsIContent* aNode1, nsIContent* aNode2) {
if (!aNode1 || !aNode2) {
return nullptr;
}
return nsContentUtils::GetCommonFlattenedTreeAncestor(aNode1, aNode2);
}
class EnterLeaveDispatcher {
public:
EnterLeaveDispatcher(EventStateManager* aESM, nsIContent* aTarget,
nsIContent* aRelatedTarget,
WidgetMouseEvent* aMouseEvent,
EventMessage aEventMessage)
: mESM(aESM), mMouseEvent(aMouseEvent), mEventMessage(aEventMessage) {
nsPIDOMWindowInner* win =
aTarget ? aTarget->OwnerDoc()->GetInnerWindow() : nullptr;
if (aMouseEvent->AsPointerEvent()
? win && win->HasPointerEnterLeaveEventListeners()
: win && win->HasMouseEnterLeaveEventListeners()) {
mRelatedTarget =
aRelatedTarget ? aRelatedTarget->FindFirstNonChromeOnlyAccessContent()
: nullptr;
nsINode* commonParent = FindCommonAncestor(aTarget, aRelatedTarget);
nsIContent* current = aTarget;
// Note, it is ok if commonParent is null!
while (current && current != commonParent) {
if (!current->ChromeOnlyAccess()) {
mTargets.AppendObject(current);
}
// mouseenter/leave is fired only on elements.
current = current->GetFlattenedTreeParent();
}
}
}
// TODO: Convert this to MOZ_CAN_RUN_SCRIPT (bug 1415230)
MOZ_CAN_RUN_SCRIPT_BOUNDARY void Dispatch() {
if (mEventMessage == eMouseEnter || mEventMessage == ePointerEnter) {
for (int32_t i = mTargets.Count() - 1; i >= 0; --i) {
nsCOMPtr<nsIWidget> widget = mESM->DispatchMouseOrPointerBoundaryEvent(
mMouseEvent, mEventMessage, MOZ_KnownLive(mTargets[i]),
mRelatedTarget);
}
} else {
for (int32_t i = 0; i < mTargets.Count(); ++i) {
nsCOMPtr<nsIWidget> widget = mESM->DispatchMouseOrPointerBoundaryEvent(
mMouseEvent, mEventMessage, MOZ_KnownLive(mTargets[i]),
mRelatedTarget);
}
}
}
// Nothing overwrites anything after constructor. Please remove MOZ_KnownLive
// and MOZ_KNOWN_LIVE if anything marked as such becomes mutable.
const RefPtr<EventStateManager> mESM;
nsCOMArray<nsIContent> mTargets;
MOZ_KNOWN_LIVE nsCOMPtr<nsIContent> mRelatedTarget;
WidgetMouseEvent* mMouseEvent;
EventMessage mEventMessage;
};
void EventStateManager::NotifyMouseOut(WidgetMouseEvent* aMouseEvent,
nsIContent* aMovingInto) {
const bool isPointer = aMouseEvent->mClass == ePointerEventClass;
LogModule* const logModule =
isPointer ? sPointerBoundaryLog : sMouseBoundaryLog;
RefPtr<OverOutElementsWrapper> wrapper = GetWrapperByEventID(aMouseEvent);
// If there is no deepest "leave" event target, that means the last "over"
// target has already been removed from the tree. Therefore, checking only
// the "leave" event target is enough.
if (!wrapper || !wrapper->GetDeepestLeaveEventTarget()) {
return;
}
// Before firing "out" and/or "leave" events, check for recursion
if (wrapper->IsDispatchingOutEventOnLastOverEventTarget()) {
return;
}
MOZ_LOG(logModule, LogLevel::Info,
("NotifyMouseOut: the source event is %s (IsReal()=%s)",
ToChar(aMouseEvent->mMessage),
aMouseEvent->IsReal() ? "true" : "false"));
// XXX If a content node is a container of remove content, it should be
// replaced with them and its children should not be visible. Therefore,
// if the deepest "enter" target is not the last "over" target, i.e., the
// last "over" target has been removed from the DOM tree, it means that the
// child/descendant was not replaced by remote content. So,
// wrapper->GetOutEventTaget() may be enough here.
if (RefPtr<nsFrameLoaderOwner> flo =
do_QueryObject(wrapper->GetDeepestLeaveEventTarget())) {
if (BrowsingContext* bc = flo->GetExtantBrowsingContext()) {
if (nsIDocShell* docshell = bc->GetDocShell()) {
if (RefPtr<nsPresContext> presContext = docshell->GetPresContext()) {
EventStateManager* kidESM = presContext->EventStateManager();
// Not moving into any element in this subdocument
MOZ_LOG(logModule, LogLevel::Info,
("Notifying child EventStateManager (%p) of \"out\" "
"event...",
kidESM));
kidESM->NotifyMouseOut(aMouseEvent, nullptr);
}
}
}
}
// That could have caused DOM events which could wreak havoc. Reverify
// things and be careful.
if (!wrapper->GetDeepestLeaveEventTarget()) {
return;
}
wrapper->WillDispatchOutAndOrLeaveEvent();
// Don't touch hover state if aMovingInto is non-null. Caller will update
// hover state itself, and we have optimizations for hover switching between
// two nearby elements both deep in the DOM tree that would be defeated by
// switching the hover state to null here.
if (!aMovingInto && !isPointer) {
// Unset :hover
SetContentState(nullptr, ElementState::HOVER);
}
EnterLeaveDispatcher leaveDispatcher(
this, wrapper->GetDeepestLeaveEventTarget(), aMovingInto, aMouseEvent,
isPointer ? ePointerLeave : eMouseLeave);
// "out" events hould be fired only when the deepest "leave" event target
// is the last "over" event target.
if (nsCOMPtr<nsIContent> outEventTarget = wrapper->GetOutEventTarget()) {
MOZ_LOG(logModule, LogLevel::Info,
("Dispatching %s event to %s (%p)",
isPointer ? "ePointerOut" : "eMouseOut",
outEventTarget ? ToString(*outEventTarget).c_str() : "nullptr",
outEventTarget.get()));
nsCOMPtr<nsIWidget> widget = DispatchMouseOrPointerBoundaryEvent(
aMouseEvent, isPointer ? ePointerOut : eMouseOut, outEventTarget,
aMovingInto);
}
MOZ_LOG(logModule, LogLevel::Info,
("Dispatching %s event to %s (%p) and its ancestors",
isPointer ? "ePointerLeave" : "eMouseLeave",
wrapper->GetDeepestLeaveEventTarget()
? ToString(*wrapper->GetDeepestLeaveEventTarget()).c_str()
: "nullptr",
wrapper->GetDeepestLeaveEventTarget()));
leaveDispatcher.Dispatch();
MOZ_LOG(logModule, LogLevel::Info,
("Dispatched \"out\" and/or \"leave\" events"));
wrapper->DidDispatchOutAndOrLeaveEvent();
}
void EventStateManager::RecomputeMouseEnterStateForRemoteFrame(
Element& aElement) {
if (!mMouseEnterLeaveHelper ||
mMouseEnterLeaveHelper->GetDeepestLeaveEventTarget() != &aElement) {
return;
}
if (BrowserParent* remote = BrowserParent::GetFrom(&aElement)) {
remote->MouseEnterIntoWidget();
}
}
void EventStateManager::NotifyMouseOver(WidgetMouseEvent* aMouseEvent,
nsIContent* aContent) {
NS_ASSERTION(aContent, "Mouse must be over something");
const bool isPointer = aMouseEvent->mClass == ePointerEventClass;
LogModule* const logModule =
isPointer ? sPointerBoundaryLog : sMouseBoundaryLog;
RefPtr<OverOutElementsWrapper> wrapper = GetWrapperByEventID(aMouseEvent);
// If we have next "out" event target and it's the new "over" target, we don't
// need to dispatch "out" nor "enter" event.
if (!wrapper || aContent == wrapper->GetOutEventTarget()) {
return;
}
// Before firing "over" and "enter" events, check for recursion
if (wrapper->IsDispatchingOverEventOn(aContent)) {
return;
}
MOZ_LOG(logModule, LogLevel::Info,
("NotifyMouseOver: the source event is %s (IsReal()=%s)",
ToChar(aMouseEvent->mMessage),
aMouseEvent->IsReal() ? "true" : "false"));
// Check to see if we're a subdocument and if so update the parent
// document's ESM state to indicate that the mouse is over the
// content associated with our subdocument.
EnsureDocument(mPresContext);
if (Document* parentDoc = mDocument->GetInProcessParentDocument()) {
if (nsCOMPtr<nsIContent> docContent = mDocument->GetEmbedderElement()) {
if (PresShell* parentPresShell = parentDoc->GetPresShell()) {
RefPtr<EventStateManager> parentESM =
parentPresShell->GetPresContext()->EventStateManager();
MOZ_LOG(logModule, LogLevel::Info,
("Notifying parent EventStateManager (%p) of \"over\" "
"event...",
parentESM.get()));
parentESM->NotifyMouseOver(aMouseEvent, docContent);
}
}
}
// Firing the DOM event in the parent document could cause all kinds
// of havoc. Reverify and take care.
if (aContent == wrapper->GetOutEventTarget()) {
return;
}
// Remember the deepest leave event target as the related content for the
// DispatchMouseOrPointerBoundaryEvent() call below, since NotifyMouseOut()
// resets it, bug 298477.
nsCOMPtr<nsIContent> deepestLeaveEventTarget =
wrapper->GetDeepestLeaveEventTarget();
EnterLeaveDispatcher enterDispatcher(this, aContent, deepestLeaveEventTarget,
aMouseEvent,
isPointer ? ePointerEnter : eMouseEnter);
if (!isPointer) {
SetContentState(aContent, ElementState::HOVER);
}
NotifyMouseOut(aMouseEvent, aContent);
wrapper->WillDispatchOverAndEnterEvent(aContent);
// Fire mouseover
// XXX If aContent has already been removed from the DOM tree, what should we
// do? At least, dispatching `mouseover` on it is odd.
MOZ_LOG(logModule, LogLevel::Info,
("Dispatching %s event to %s (%p)",
isPointer ? "ePointerOver" : "eMouseOver",
aContent ? ToString(*aContent).c_str() : "nullptr", aContent));
nsCOMPtr<nsIWidget> targetWidget = DispatchMouseOrPointerBoundaryEvent(
aMouseEvent, isPointer ? ePointerOver : eMouseOver, aContent,
deepestLeaveEventTarget);
MOZ_LOG(logModule, LogLevel::Info,
("Dispatching %s event to %s (%p) and its ancestors",
isPointer ? "ePointerEnter" : "eMouseEnter",
aContent ? ToString(*aContent).c_str() : "nullptr", aContent));
enterDispatcher.Dispatch();
MOZ_LOG(logModule, LogLevel::Info,
("Dispatched \"over\" and \"enter\" events (the original \"over\" "
"event target was in the document %p, and now in %p)",
aContent->GetComposedDoc(), mDocument.get()));
wrapper->DidDispatchOverAndEnterEvent(
aContent->GetComposedDoc() == mDocument ? aContent : nullptr,
targetWidget);
}
// Returns the center point of the window's client area. This is
// in widget coordinates, i.e. relative to the widget's top-left
// corner, not in screen coordinates, the same units that UIEvent::
// refpoint is in. It may not be the exact center of the window if
// the platform requires rounding the coordinate.
static LayoutDeviceIntPoint GetWindowClientRectCenter(nsIWidget* aWidget) {
NS_ENSURE_TRUE(aWidget, LayoutDeviceIntPoint(0, 0));
LayoutDeviceIntRect rect = aWidget->GetClientBounds();
LayoutDeviceIntPoint point(rect.width / 2, rect.height / 2);
int32_t round = aWidget->RoundsWidgetCoordinatesTo();
point.x = point.x / round * round;
point.y = point.y / round * round;
return point;
}
void EventStateManager::GeneratePointerEnterExit(EventMessage aMessage,
WidgetMouseEvent* aEvent) {
WidgetPointerEvent pointerEvent(*aEvent);
pointerEvent.mMessage = aMessage;
GenerateMouseEnterExit(&pointerEvent);
}
/* static */
void EventStateManager::UpdateLastRefPointOfMouseEvent(
WidgetMouseEvent* aMouseEvent) {
if (aMouseEvent->mMessage != eMouseMove &&
aMouseEvent->mMessage != ePointerMove) {
return;
}
// Mouse movement is reported on the MouseEvent.movement{X,Y} fields.
// Movement is calculated in UIEvent::GetMovementPoint() as:
// previous_mousemove_mRefPoint - current_mousemove_mRefPoint.
if (PointerLockManager::IsLocked() && aMouseEvent->mWidget) {
// The pointer is locked. If the pointer is not located at the center of
// the window, dispatch a synthetic mousemove to return the pointer there.
// Doing this between "real" pointer moves gives the impression that the
// (locked) pointer can continue moving and won't stop at the screen
// boundary. We cancel the synthetic event so that we don't end up
// dispatching the centering move event to content.
aMouseEvent->mLastRefPoint =
GetWindowClientRectCenter(aMouseEvent->mWidget);
} else if (sLastRefPoint == kInvalidRefPoint) {
// We don't have a valid previous mousemove mRefPoint. This is either
// the first move we've encountered, or the mouse has just re-entered
// the application window. We should report (0,0) movement for this
// case, so make the current and previous mRefPoints the same.
aMouseEvent->mLastRefPoint = aMouseEvent->mRefPoint;
} else {
aMouseEvent->mLastRefPoint = sLastRefPoint;
}
}
/* static */
void EventStateManager::ResetPointerToWindowCenterWhilePointerLocked(
WidgetMouseEvent* aMouseEvent) {
MOZ_ASSERT(PointerLockManager::IsLocked());
if ((aMouseEvent->mMessage != eMouseMove &&
aMouseEvent->mMessage != ePointerMove) ||
!aMouseEvent->mWidget) {
return;
}
// We generate pointermove from mousemove event, so only synthesize native
// mouse move and update sSynthCenteringPoint by mousemove event.
bool updateSynthCenteringPoint = aMouseEvent->mMessage == eMouseMove;
// The pointer is locked. If the pointer is not located at the center of
// the window, dispatch a synthetic mousemove to return the pointer there.
// Doing this between "real" pointer moves gives the impression that the
// (locked) pointer can continue moving and won't stop at the screen
// boundary. We cancel the synthetic event so that we don't end up
// dispatching the centering move event to content.
LayoutDeviceIntPoint center = GetWindowClientRectCenter(aMouseEvent->mWidget);
if (aMouseEvent->mRefPoint != center && updateSynthCenteringPoint) {
// Mouse move doesn't finish at the center of the window. Dispatch a
// synthetic native mouse event to move the pointer back to the center
// of the window, to faciliate more movement. But first, record that
// we've dispatched a synthetic mouse movement, so we can cancel it
// in the other branch here.
sSynthCenteringPoint = center;
// XXX Once we fix XXX comments in SetPointerLock about this API, we could
// restrict that this API works only in the automation mode or in the
// pointer locked situation.
aMouseEvent->mWidget->SynthesizeNativeMouseMove(
center + aMouseEvent->mWidget->WidgetToScreenOffset(), nullptr);
} else if (aMouseEvent->mRefPoint == sSynthCenteringPoint) {
// This is the "synthetic native" event we dispatched to re-center the
// pointer. Cancel it so we don't expose the centering move to content.
aMouseEvent->StopPropagation();
// Clear sSynthCenteringPoint so we don't cancel other events
// targeted at the center.
if (updateSynthCenteringPoint) {
sSynthCenteringPoint = kInvalidRefPoint;
}
}
}
/* static */
void EventStateManager::UpdateLastPointerPosition(
WidgetMouseEvent* aMouseEvent) {
if (aMouseEvent->mMessage != eMouseMove) {
return;
}
sLastRefPoint = aMouseEvent->mRefPoint;
}
void EventStateManager::GenerateMouseEnterExit(WidgetMouseEvent* aMouseEvent) {
EnsureDocument(mPresContext);
if (!mDocument) return;
// Hold onto old target content through the event and reset after.
nsCOMPtr<nsIContent> targetBeforeEvent = mCurrentTargetContent;
switch (aMouseEvent->mMessage) {
case eMouseMove:
case ePointerMove:
case ePointerDown:
case ePointerGotCapture: {
// Get the target content target (mousemove target == mouseover target)
nsCOMPtr<nsIContent> targetElement = GetEventTargetContent(aMouseEvent);
if (!targetElement) {
// We're always over the document root, even if we're only
// over dead space in a page (whose frame is not associated with
// any content) or in print preview dead space
targetElement = mDocument->GetRootElement();
}
if (targetElement) {
NotifyMouseOver(aMouseEvent, targetElement);
}
break;
}
case ePointerUp: {
if (aMouseEvent->mFlags.mDispatchedAtLeastOnce) {
// If we've already dispatched the pointerup event caused by
// non-hoverable input device like touch, we need to synthesize
// pointerout and pointerleave events because the poiner is valid only
// while it's "down".
if (!aMouseEvent->InputSourceSupportsHover()) {
NotifyMouseOut(aMouseEvent, nullptr);
}
break;
}
// If we're going to dispatch the pointerup event and the element under
// the pointer is changed from the previous pointer event dispatching, we
// need to dispatch pointer boundary events. If the pointing device is
// hoverable, we always need to do it. Otherwise, an element captures the
// pointer by default. If so, we don't need the boundary events, but if
// the capture has already been released, e.g., by the capturing element
// is removed, we need to dispatch the pointer boundary event the same
// way as with hoverable pointer.
if (aMouseEvent->InputSourceSupportsHover() ||
!PointerEventHandler::GetPointerCapturingElement(
aMouseEvent->pointerId)) {
nsCOMPtr<nsIContent> targetElement = GetEventTargetContent(aMouseEvent);
if (!targetElement) {
targetElement = mDocument->GetRootElement();
}
if (targetElement) {
NotifyMouseOver(aMouseEvent, targetElement);
}
break;
}
break;
}
case ePointerLeave:
case ePointerCancel:
case eMouseExitFromWidget: {
// This is actually the window mouse exit or pointer leave event. We're
// not moving into any new element.
RefPtr<OverOutElementsWrapper> helper = GetWrapperByEventID(aMouseEvent);
if (helper) {
nsCOMPtr<nsIWidget> lastOverWidget = helper->GetLastOverWidget();
if (lastOverWidget &&
nsContentUtils::GetTopLevelWidget(aMouseEvent->mWidget) !=
nsContentUtils::GetTopLevelWidget(lastOverWidget)) {
// the Mouse/PointerOut event widget doesn't have same top widget with
// the last over event target, it's a spurious event for the frame for
// the target.
break;
}
}
// Reset sLastRefPoint, so that we'll know not to report any
// movement the next time we re-enter the window.
sLastRefPoint = kInvalidRefPoint;
NotifyMouseOut(aMouseEvent, nullptr);
break;
}
default:
break;
}
// reset mCurretTargetContent to what it was
mCurrentTargetContent = targetBeforeEvent;
}
OverOutElementsWrapper* EventStateManager::GetWrapperByEventID(
WidgetMouseEvent* aMouseEvent) {
MOZ_ASSERT(aMouseEvent);
WidgetPointerEvent* pointer = aMouseEvent->AsPointerEvent();
if (!pointer) {
if (!mMouseEnterLeaveHelper) {
mMouseEnterLeaveHelper = new OverOutElementsWrapper(
OverOutElementsWrapper::BoundaryEventType::Mouse);
}
return mMouseEnterLeaveHelper;
}
return mPointersEnterLeaveHelper.GetOrInsertNew(
pointer->pointerId, OverOutElementsWrapper::BoundaryEventType::Pointer);
}
/* static */
void EventStateManager::SetPointerLock(nsIWidget* aWidget,
nsPresContext* aPresContext) {
// Reset mouse wheel transaction
WheelTransaction::EndTransaction();
// Deal with DnD events
nsCOMPtr<nsIDragService> dragService =
do_GetService("@mozilla.org/widget/dragservice;1");
if (PointerLockManager::IsLocked()) {
MOZ_ASSERT(aWidget, "Locking pointer requires a widget");
MOZ_ASSERT(aPresContext, "Locking pointer requires a presContext");
// Release all pointer capture when a pointer lock is successfully applied
// on an element.
PointerEventHandler::ReleaseAllPointerCapture();
// Store the last known ref point so we can reposition the pointer after
// unlock.
sPreLockScreenPoint = LayoutDeviceIntPoint::Round(
sLastScreenPoint * aPresContext->CSSToDevPixelScale());
// Fire a synthetic mouse move to ensure event state is updated. We first
// set the mouse to the center of the window, so that the mouse event
// doesn't report any movement.
// XXX Cannot we do synthesize the native mousemove in the parent process
// with calling LockNativePointer below? Then, we could make this API
// work only in the automation mode.
sLastRefPoint = GetWindowClientRectCenter(aWidget);
aWidget->SynthesizeNativeMouseMove(
sLastRefPoint + aWidget->WidgetToScreenOffset(), nullptr);
// Suppress DnD
if (dragService) {
dragService->Suppress();
}
// Activate native pointer lock on platforms where it is required (Wayland)
aWidget->LockNativePointer();
} else {
if (aWidget) {
// Deactivate native pointer lock on platforms where it is required
aWidget->UnlockNativePointer();
}
// Reset SynthCenteringPoint to invalid so that next time we start
// locking pointer, it has its initial value.
sSynthCenteringPoint = kInvalidRefPoint;
if (aWidget) {
// Unlocking, so return pointer to the original position by firing a
// synthetic mouse event. We first reset sLastRefPoint to its
// pre-pointerlock position, so that the synthetic mouse event reports
// no movement.
sLastRefPoint = sPreLockScreenPoint - aWidget->WidgetToScreenOffset();
// XXX Cannot we do synthesize the native mousemove in the parent process
// with calling `UnlockNativePointer` above? Then, we could make this
// API work only in the automation mode.
aWidget->SynthesizeNativeMouseMove(sPreLockScreenPoint, nullptr);
}
// Unsuppress DnD
if (dragService) {
dragService->Unsuppress();
}
}
}
void EventStateManager::GenerateDragDropEnterExit(nsPresContext* aPresContext,
WidgetDragEvent* aDragEvent) {
// Hold onto old target content through the event and reset after.
nsCOMPtr<nsIContent> targetBeforeEvent = mCurrentTargetContent;
switch (aDragEvent->mMessage) {
case eDragOver: {
// when dragging from one frame to another, events are fired in the
// order: dragexit, dragenter, dragleave
if (sLastDragOverFrame != mCurrentTarget) {
// We'll need the content, too, to check if it changed separately from
// the frames.
nsCOMPtr<nsIContent> lastContent;
nsCOMPtr<nsIContent> targetContent =
mCurrentTarget->GetContentForEvent(aDragEvent);
if (targetContent && targetContent->IsText()) {
targetContent = targetContent->GetFlattenedTreeParent();
}
if (sLastDragOverFrame) {
// The frame has changed but the content may not have. Check before
// dispatching to content
lastContent = sLastDragOverFrame->GetContentForEvent(aDragEvent);
if (lastContent && lastContent->IsText()) {
lastContent = lastContent->GetFlattenedTreeParent();
}
RefPtr<nsPresContext> presContext = sLastDragOverFrame->PresContext();
FireDragEnterOrExit(presContext, aDragEvent, eDragExit, targetContent,
lastContent, sLastDragOverFrame);
nsIContent* target = sLastDragOverFrame
? sLastDragOverFrame.GetFrame()->GetContent()
: nullptr;
// XXXedgar, look like we need to consider fission OOP iframe, too.
if (IsTopLevelRemoteTarget(target)) {
// Dragging something and moving from web content to chrome only
// fires dragexit and dragleave to xul:browser. We have to forward
// dragexit to sLastDragOverFrame when its content is a remote
// target. We don't forward dragleave since it's generated from
// dragexit.
WidgetDragEvent remoteEvent(aDragEvent->IsTrusted(), eDragExit,
aDragEvent->mWidget);
remoteEvent.AssignDragEventData(*aDragEvent, true);
remoteEvent.mFlags.mIsSynthesizedForTests =
aDragEvent->mFlags.mIsSynthesizedForTests;
nsEventStatus remoteStatus = nsEventStatus_eIgnore;
HandleCrossProcessEvent(&remoteEvent, &remoteStatus);
}
}
AutoWeakFrame currentTraget = mCurrentTarget;
FireDragEnterOrExit(aPresContext, aDragEvent, eDragEnter, lastContent,
targetContent, currentTraget);
if (sLastDragOverFrame) {
RefPtr<nsPresContext> presContext = sLastDragOverFrame->PresContext();
FireDragEnterOrExit(presContext, aDragEvent, eDragLeave,
targetContent, lastContent, sLastDragOverFrame);
}
sLastDragOverFrame = mCurrentTarget;
}
} break;
case eDragExit: {
// This is actually the window mouse exit event.
if (sLastDragOverFrame) {
nsCOMPtr<nsIContent> lastContent =
sLastDragOverFrame->GetContentForEvent(aDragEvent);
RefPtr<nsPresContext> lastDragOverFramePresContext =
sLastDragOverFrame->PresContext();
FireDragEnterOrExit(lastDragOverFramePresContext, aDragEvent, eDragExit,
nullptr, lastContent, sLastDragOverFrame);
FireDragEnterOrExit(lastDragOverFramePresContext, aDragEvent,
eDragLeave, nullptr, lastContent,
sLastDragOverFrame);
sLastDragOverFrame = nullptr;
}
} break;
default:
break;
}
// reset mCurretTargetContent to what it was
mCurrentTargetContent = targetBeforeEvent;
// Now flush all pending notifications, for better responsiveness.
FlushLayout(aPresContext);
}
void EventStateManager::FireDragEnterOrExit(nsPresContext* aPresContext,
WidgetDragEvent* aDragEvent,
EventMessage aMessage,
nsIContent* aRelatedTarget,
nsIContent* aTargetContent,
AutoWeakFrame& aTargetFrame) {
MOZ_ASSERT(aMessage == eDragLeave || aMessage == eDragExit ||
aMessage == eDragEnter);
nsEventStatus status = nsEventStatus_eIgnore;
WidgetDragEvent event(aDragEvent->IsTrusted(), aMessage, aDragEvent->mWidget);
event.AssignDragEventData(*aDragEvent, false);
event.mFlags.mIsSynthesizedForTests =
aDragEvent->mFlags.mIsSynthesizedForTests;
event.mRelatedTarget = aRelatedTarget;
if (aMessage == eDragExit && !StaticPrefs::dom_event_dragexit_enabled()) {
event.mFlags.mOnlyChromeDispatch = true;
}
mCurrentTargetContent = aTargetContent;
if (aTargetContent != aRelatedTarget) {
// XXX This event should still go somewhere!!
if (aTargetContent) {
EventDispatcher::Dispatch(aTargetContent, aPresContext, &event, nullptr,
&status);
}
// adjust the drag hover if the dragenter event was cancelled or this is a
// drag exit
if (status == nsEventStatus_eConsumeNoDefault || aMessage == eDragExit) {
SetContentState((aMessage == eDragEnter) ? aTargetContent : nullptr,
ElementState::DRAGOVER);
}
// collect any changes to moz cursor settings stored in the event's
// data transfer.
UpdateDragDataTransfer(&event);
}
// Finally dispatch the event to the frame
if (aTargetFrame) {
aTargetFrame->HandleEvent(aPresContext, &event, &status);
}
}
void EventStateManager::UpdateDragDataTransfer(WidgetDragEvent* dragEvent) {
NS_ASSERTION(dragEvent, "drag event is null in UpdateDragDataTransfer!");
if (!dragEvent->mDataTransfer) {
return;
}
nsCOMPtr<nsIDragSession> dragSession =
nsContentUtils::GetDragSession(mPresContext);
if (dragSession) {
// the initial dataTransfer is the one from the dragstart event that
// was set on the dragSession when the drag began.
RefPtr<DataTransfer> initialDataTransfer = dragSession->GetDataTransfer();
if (initialDataTransfer) {
// retrieve the current moz cursor setting and save it.
nsAutoString mozCursor;
dragEvent->mDataTransfer->GetMozCursor(mozCursor);
initialDataTransfer->SetMozCursor(mozCursor);
}
}
}
nsresult EventStateManager::SetClickCount(WidgetMouseEvent* aEvent,
nsEventStatus* aStatus,
nsIContent* aOverrideClickTarget) {
nsCOMPtr<nsIContent> mouseContent = aOverrideClickTarget;
if (!mouseContent && mCurrentTarget) {
mouseContent = mCurrentTarget->GetContentForEvent(aEvent);
}
if (mouseContent && mouseContent->IsText()) {
nsINode* parent = mouseContent->GetFlattenedTreeParentNode();
if (parent && parent->IsContent()) {
mouseContent = parent->AsContent();
}
}
LastMouseDownInfo& mouseDownInfo = GetLastMouseDownInfo(aEvent->mButton);
if (aEvent->mMessage == eMouseDown) {
mouseDownInfo.mLastMouseDownContent =
!aEvent->mClickEventPrevented ? mouseContent : nullptr;
if (mouseDownInfo.mLastMouseDownContent) {
if (HTMLInputElement* input = HTMLInputElement::FromNodeOrNull(
mouseDownInfo.mLastMouseDownContent)) {
mouseDownInfo.mLastMouseDownInputControlType =
Some(input->ControlType());
} else if (mouseDownInfo.mLastMouseDownContent
->IsInNativeAnonymousSubtree()) {
if (HTMLInputElement* input = HTMLInputElement::FromNodeOrNull(
mouseDownInfo.mLastMouseDownContent
->GetFlattenedTreeParent())) {
mouseDownInfo.mLastMouseDownInputControlType =
Some(input->ControlType());
}
}
}
} else {
aEvent->mClickTarget =
!aEvent->mClickEventPrevented
? GetCommonAncestorForMouseUp(
mouseContent, mouseDownInfo.mLastMouseDownContent,
mouseDownInfo.mLastMouseDownInputControlType)
: nullptr;
if (aEvent->mClickTarget) {
aEvent->mClickCount = mouseDownInfo.mClickCount;
mouseDownInfo.mClickCount = 0;
} else {
aEvent->mClickCount = 0;
}
mouseDownInfo.mLastMouseDownContent = nullptr;
mouseDownInfo.mLastMouseDownInputControlType = Nothing();
}
return NS_OK;
}
// static
bool EventStateManager::EventCausesClickEvents(
const WidgetMouseEvent& aMouseEvent) {
if (NS_WARN_IF(aMouseEvent.mMessage != eMouseUp)) {
return false;
}
// If the mouseup event is synthesized event, we don't need to dispatch
// click events.
if (!aMouseEvent.IsReal()) {
return false;
}
// If mouse is still over same element, clickcount will be > 1.
// If it has moved it will be zero, so no click.
if (!aMouseEvent.mClickCount || !aMouseEvent.mClickTarget) {
return false;
}
// If click event was explicitly prevented, we shouldn't dispatch it.
if (aMouseEvent.mClickEventPrevented) {
return false;
}
// Check that the window isn't disabled before firing a click
// (see bug 366544).
return !(aMouseEvent.mWidget && !aMouseEvent.mWidget->IsEnabled());
}
nsresult EventStateManager::InitAndDispatchClickEvent(
WidgetMouseEvent* aMouseUpEvent, nsEventStatus* aStatus,
EventMessage aMessage, PresShell* aPresShell, nsIContent* aMouseUpContent,
AutoWeakFrame aCurrentTarget, bool aNoContentDispatch,
nsIContent* aOverrideClickTarget) {
MOZ_ASSERT(aMouseUpEvent);
MOZ_ASSERT(EventCausesClickEvents(*aMouseUpEvent));
MOZ_ASSERT(aMouseUpContent || aCurrentTarget || aOverrideClickTarget);
Maybe<WidgetPointerEvent> pointerEvent;
Maybe<WidgetMouseEvent> mouseEvent;
if (IsPointerEventMessage(aMessage)) {
pointerEvent.emplace(aMouseUpEvent->IsTrusted(), aMessage,
aMouseUpEvent->mWidget);
} else {
mouseEvent.emplace(aMouseUpEvent->IsTrusted(), aMessage,
aMouseUpEvent->mWidget, WidgetMouseEvent::eReal);
}
WidgetMouseEvent& mouseOrPointerEvent =
pointerEvent.isSome() ? pointerEvent.ref() : mouseEvent.ref();
mouseOrPointerEvent.mRefPoint = aMouseUpEvent->mRefPoint;
mouseOrPointerEvent.mClickCount = aMouseUpEvent->mClickCount;
mouseOrPointerEvent.mModifiers = aMouseUpEvent->mModifiers;
mouseOrPointerEvent.mButtons = aMouseUpEvent->mButtons;
mouseOrPointerEvent.mTimeStamp = aMouseUpEvent->mTimeStamp;
mouseOrPointerEvent.mFlags.mOnlyChromeDispatch = aNoContentDispatch;
mouseOrPointerEvent.mFlags.mNoContentDispatch = aNoContentDispatch;
mouseOrPointerEvent.mButton = aMouseUpEvent->mButton;
mouseOrPointerEvent.pointerId = aMouseUpEvent->pointerId;
mouseOrPointerEvent.mInputSource = aMouseUpEvent->mInputSource;
nsIContent* target = aMouseUpContent;
nsIFrame* targetFrame = aCurrentTarget;
if (aOverrideClickTarget) {
target = aOverrideClickTarget;
targetFrame = aOverrideClickTarget->GetPrimaryFrame();
}
if (!target->IsInComposedDoc()) {
return NS_OK;
}
// Use local event status for each click event dispatching since it'll be
// cleared by EventStateManager::PreHandleEvent(). Therefore, dispatching
// an event means that previous event status will be ignored.
nsEventStatus status = nsEventStatus_eIgnore;
nsresult rv = aPresShell->HandleEventWithTarget(
&mouseOrPointerEvent, targetFrame, MOZ_KnownLive(target), &status);
// Copy mMultipleActionsPrevented flag from a click event to the mouseup
// event only when it's set to true. It may be set to true if an editor has
// already handled it. This is important to avoid two or more default
// actions handled here.
aMouseUpEvent->mFlags.mMultipleActionsPrevented |=
mouseOrPointerEvent.mFlags.mMultipleActionsPrevented;
// If current status is nsEventStatus_eConsumeNoDefault, we don't need to
// overwrite it.
if (*aStatus == nsEventStatus_eConsumeNoDefault) {
return rv;
}
// If new status is nsEventStatus_eConsumeNoDefault or
// nsEventStatus_eConsumeDoDefault, use it.
if (status == nsEventStatus_eConsumeNoDefault ||
status == nsEventStatus_eConsumeDoDefault) {
*aStatus = status;
return rv;
}
// Otherwise, keep the original status.
return rv;
}
nsresult EventStateManager::PostHandleMouseUp(
WidgetMouseEvent* aMouseUpEvent, nsEventStatus* aStatus,
nsIContent* aOverrideClickTarget) {
MOZ_ASSERT(aMouseUpEvent);
MOZ_ASSERT(EventCausesClickEvents(*aMouseUpEvent));
MOZ_ASSERT(aStatus);
RefPtr<PresShell> presShell = mPresContext->GetPresShell();
if (!presShell) {
return NS_OK;
}
nsCOMPtr<nsIContent> clickTarget =
nsIContent::FromEventTargetOrNull(aMouseUpEvent->mClickTarget);
NS_ENSURE_STATE(clickTarget);
// Fire click events if the event target is still available.
// Note that do not include the eMouseUp event's status since we ignore it
// for compatibility with the other browsers.
nsEventStatus status = nsEventStatus_eIgnore;
nsresult rv = DispatchClickEvents(presShell, aMouseUpEvent, &status,
clickTarget, aOverrideClickTarget);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// Do not do anything if preceding click events are consumed.
// Note that Chromium dispatches "paste" event and actually pates clipboard
// text into focused editor even if the preceding click events are consumed.
// However, this is different from our traditional behavior and does not
// conform to DOM events. If we need to keep compatibility with Chromium,
// we should change it later.
if (status == nsEventStatus_eConsumeNoDefault) {
*aStatus = nsEventStatus_eConsumeNoDefault;
return NS_OK;
}
// Handle middle click paste if it's enabled and the mouse button is middle.
if (aMouseUpEvent->mButton != MouseButton::eMiddle ||
!WidgetMouseEvent::IsMiddleClickPasteEnabled()) {
return NS_OK;
}
DebugOnly<nsresult> rvIgnored =
HandleMiddleClickPaste(presShell, aMouseUpEvent, &status, nullptr);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rvIgnored),
"Failed to paste for a middle click");
// If new status is nsEventStatus_eConsumeNoDefault or
// nsEventStatus_eConsumeDoDefault, use it.
if (*aStatus != nsEventStatus_eConsumeNoDefault &&
(status == nsEventStatus_eConsumeNoDefault ||
status == nsEventStatus_eConsumeDoDefault)) {
*aStatus = status;
}
// Don't return error even if middle mouse paste fails since we haven't
// handled it here.
<