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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
/* a presentation of a document, part 2 */
#include "mozilla/PresShell.h"
#include "Units.h"
#include "mozilla/dom/FontFaceSet.h"
#include "mozilla/dom/ElementBinding.h"
#include "mozilla/dom/LargestContentfulPaint.h"
#include "mozilla/dom/PerformanceMainThread.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/AutoRestore.h"
#include "mozilla/ContentIterator.h"
#include "mozilla/DisplayPortUtils.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/GeckoMVMContext.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/IntegerRange.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/BrowserChild.h"
#include "mozilla/Likely.h"
#include "mozilla/Logging.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/PerfStats.h"
#include "mozilla/PointerLockManager.h"
#include "mozilla/PresShellInlines.h"
#include "mozilla/RangeUtils.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/Sprintf.h"
#include "mozilla/StaticAnalysisFunctions.h"
#include "mozilla/StaticPrefs_apz.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/StaticPrefs_font.h"
#include "mozilla/StaticPrefs_image.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/StaticPrefs_toolkit.h"
#include "mozilla/Try.h"
#include "mozilla/TextEvents.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/TouchEvents.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Unused.h"
#include "mozilla/ViewportUtils.h"
#include "mozilla/gfx/Types.h"
#include <algorithm>
#ifdef XP_WIN
# include "winuser.h"
#endif
#include "gfxContext.h"
#include "gfxUserFontSet.h"
#include "nsContentList.h"
#include "nsPresContext.h"
#include "nsIContent.h"
#include "mozilla/dom/BrowserBridgeChild.h"
#include "mozilla/dom/BrowsingContext.h"
#include "mozilla/dom/CanonicalBrowsingContext.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/PointerEventHandler.h"
#include "mozilla/dom/PopupBlocker.h"
#include "mozilla/dom/DOMIntersectionObserver.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/DocumentInlines.h"
#include "mozilla/dom/UserActivation.h"
#include "nsAnimationManager.h"
#include "nsNameSpaceManager.h" // for Pref-related rule management (bugs 22963,20760,31816)
#include "nsFlexContainerFrame.h"
#include "nsIFrame.h"
#include "nsViewManager.h"
#include "nsView.h"
#include "nsCRTGlue.h"
#include "prinrval.h"
#include "nsTArray.h"
#include "nsCOMArray.h"
#include "nsContainerFrame.h"
#include "mozilla/dom/Selection.h"
#include "nsGkAtoms.h"
#include "nsRange.h"
#include "nsWindowSizes.h"
#include "nsCOMPtr.h"
#include "nsReadableUtils.h"
#include "nsPageSequenceFrame.h"
#include "nsCaret.h"
#include "mozilla/AccessibleCaretEventHub.h"
#include "nsFrameManager.h"
#include "nsXPCOM.h"
#include "nsILayoutHistoryState.h"
#include "nsILineIterator.h" // for ScrollContentIntoView
#include "PLDHashTable.h"
#include "mozilla/dom/Touch.h"
#include "mozilla/dom/TouchEvent.h"
#include "mozilla/dom/PointerEventBinding.h"
#include "mozilla/dom/ShadowIncludingTreeIterator.h"
#include "nsIObserverService.h"
#include "nsDocShell.h" // for reflow observation
#include "nsIBaseWindow.h"
#include "nsError.h"
#include "nsLayoutUtils.h"
#include "nsViewportInfo.h"
#include "nsCSSRendering.h"
// for |#ifdef DEBUG| code
#include "prenv.h"
#include "nsDisplayList.h"
#include "nsRegion.h"
#include "nsAutoLayoutPhase.h"
#include "AutoProfilerStyleMarker.h"
#ifdef MOZ_REFLOW_PERF
# include "nsFontMetrics.h"
#endif
#include "MobileViewportManager.h"
#include "OverflowChangedTracker.h"
#include "PositionedEventTargeting.h"
#include "nsIReflowCallback.h"
#include "nsPIDOMWindow.h"
#include "nsFocusManager.h"
#include "nsNetUtil.h"
#include "nsThreadUtils.h"
#include "nsStyleSheetService.h"
#include "gfxUtils.h"
#include "mozilla/SMILAnimationController.h"
#include "mozilla/dom/SVGAnimationElement.h"
#include "mozilla/SVGObserverUtils.h"
#include "mozilla/SVGFragmentIdentifier.h"
#include "nsFrameSelection.h"
#include "mozilla/dom/Performance.h"
#include "nsRefreshDriver.h"
#include "nsDOMNavigationTiming.h"
// Drag & Drop, Clipboard
#include "nsIDocShellTreeItem.h"
#include "nsIURI.h"
#include "nsIScrollableFrame.h"
#include "nsITimer.h"
#ifdef ACCESSIBILITY
# include "mozilla/a11y/DocAccessible.h"
# ifdef DEBUG
# include "mozilla/a11y/Logging.h"
# endif
#endif
// For style data reconstruction
#include "nsStyleChangeList.h"
#include "nsCSSFrameConstructor.h"
#include "nsTreeBodyFrame.h"
#include "XULTreeElement.h"
#include "nsMenuPopupFrame.h"
#include "nsTreeColumns.h"
#include "nsIDOMXULMultSelectCntrlEl.h"
#include "nsIDOMXULSelectCntrlItemEl.h"
#include "nsIDOMXULMenuListElement.h"
#include "nsXULElement.h"
#include "mozilla/layers/CompositorBridgeChild.h"
#include "gfxPlatform.h"
#include "mozilla/css/ImageLoader.h"
#include "mozilla/dom/DocumentTimeline.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/Preferences.h"
#include "mozilla/Telemetry.h"
#include "nsCanvasFrame.h"
#include "nsImageFrame.h"
#include "nsIScreen.h"
#include "nsIScreenManager.h"
#include "nsPlaceholderFrame.h"
#include "nsTransitionManager.h"
#include "ChildIterator.h"
#include "mozilla/RestyleManager.h"
#include "nsIDragSession.h"
#include "nsIFrameInlines.h"
#include "mozilla/gfx/2D.h"
#include "nsNetUtil.h"
#include "nsSubDocumentFrame.h"
#include "nsQueryObject.h"
#include "mozilla/GlobalStyleSheetCache.h"
#include "mozilla/layers/InputAPZContext.h"
#include "mozilla/layers/FocusTarget.h"
#include "mozilla/layers/ScrollingInteractionContext.h"
#include "mozilla/layers/WebRenderLayerManager.h"
#include "mozilla/layers/WebRenderUserData.h"
#include "mozilla/layout/ScrollAnchorContainer.h"
#include "mozilla/layers/APZPublicUtils.h"
#include "mozilla/ProfilerLabels.h"
#include "mozilla/ProfilerMarkers.h"
#include "mozilla/ScrollTimelineAnimationTracker.h"
#include "mozilla/ScrollTypes.h"
#include "mozilla/ServoBindings.h"
#include "mozilla/ServoStyleSet.h"
#include "mozilla/StyleSheet.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/InputTaskManager.h"
#include "mozilla/dom/ImageTracker.h"
#include "nsIDocShellTreeOwner.h"
#include "nsClassHashtable.h"
#include "nsGlobalWindowOuter.h"
#include "nsHashKeys.h"
#include "ScrollSnap.h"
#include "VisualViewport.h"
#include "ZoomConstraintsClient.h"
// define the scalfactor of drag and drop images
// relative to the max screen height/width
#define RELATIVE_SCALEFACTOR 0.0925f
using namespace mozilla;
using namespace mozilla::css;
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::layers;
using namespace mozilla::gfx;
using namespace mozilla::layout;
using PaintFrameFlags = nsLayoutUtils::PaintFrameFlags;
typedef ScrollableLayerGuid::ViewID ViewID;
PresShell::CapturingContentInfo PresShell::sCapturingContentInfo;
// RangePaintInfo is used to paint ranges to offscreen buffers
struct RangePaintInfo {
RefPtr<nsRange> mRange;
nsDisplayListBuilder mBuilder;
nsDisplayList mList;
// offset of builder's reference frame to the root frame
nsPoint mRootOffset;
// Resolution at which the items are normally painted. So if we're painting
// these items in a range separately from the "full display list", we may want
// to paint them at this resolution.
float mResolution = 1.0;
RangePaintInfo(nsRange* aRange, nsIFrame* aFrame)
: mRange(aRange),
mBuilder(aFrame, nsDisplayListBuilderMode::Painting, false),
mList(&mBuilder) {
MOZ_COUNT_CTOR(RangePaintInfo);
mBuilder.BeginFrame();
}
~RangePaintInfo() {
mList.DeleteAll(&mBuilder);
mBuilder.EndFrame();
MOZ_COUNT_DTOR(RangePaintInfo);
}
};
#undef NOISY
// ----------------------------------------------------------------------
#ifdef DEBUG
// Set the environment variable GECKO_VERIFY_REFLOW_FLAGS to one or
// more of the following flags (comma separated) for handy debug
// output.
static VerifyReflowFlags gVerifyReflowFlags;
struct VerifyReflowFlagData {
const char* name;
VerifyReflowFlags bit;
};
static const VerifyReflowFlagData gFlags[] = {
// clang-format off
{ "verify", VerifyReflowFlags::On },
{ "reflow", VerifyReflowFlags::Noisy },
{ "all", VerifyReflowFlags::All },
{ "list-commands", VerifyReflowFlags::DumpCommands },
{ "noisy-commands", VerifyReflowFlags::NoisyCommands },
{ "really-noisy-commands", VerifyReflowFlags::ReallyNoisyCommands },
{ "resize", VerifyReflowFlags::DuringResizeReflow },
// clang-format on
};
# define NUM_VERIFY_REFLOW_FLAGS (sizeof(gFlags) / sizeof(gFlags[0]))
static void ShowVerifyReflowFlags() {
printf("Here are the available GECKO_VERIFY_REFLOW_FLAGS:\n");
const VerifyReflowFlagData* flag = gFlags;
const VerifyReflowFlagData* limit = gFlags + NUM_VERIFY_REFLOW_FLAGS;
while (flag < limit) {
printf(" %s\n", flag->name);
++flag;
}
printf("Note: GECKO_VERIFY_REFLOW_FLAGS is a comma separated list of flag\n");
printf("names (no whitespace)\n");
}
#endif
//========================================================================
//========================================================================
//========================================================================
#ifdef MOZ_REFLOW_PERF
class ReflowCountMgr;
static const char kGrandTotalsStr[] = "Grand Totals";
// Counting Class
class ReflowCounter {
public:
explicit ReflowCounter(ReflowCountMgr* aMgr = nullptr);
~ReflowCounter();
void ClearTotals();
void DisplayTotals(const char* aStr);
void DisplayDiffTotals(const char* aStr);
void DisplayHTMLTotals(const char* aStr);
void Add() { mTotal++; }
void Add(uint32_t aTotal) { mTotal += aTotal; }
void CalcDiffInTotals();
void SetTotalsCache();
void SetMgr(ReflowCountMgr* aMgr) { mMgr = aMgr; }
uint32_t GetTotal() { return mTotal; }
protected:
void DisplayTotals(uint32_t aTotal, const char* aTitle);
void DisplayHTMLTotals(uint32_t aTotal, const char* aTitle);
uint32_t mTotal;
uint32_t mCacheTotal;
ReflowCountMgr* mMgr; // weak reference (don't delete)
};
// Counting Class
class IndiReflowCounter {
public:
explicit IndiReflowCounter(ReflowCountMgr* aMgr = nullptr)
: mFrame(nullptr),
mCount(0),
mMgr(aMgr),
mCounter(aMgr),
mHasBeenOutput(false) {}
virtual ~IndiReflowCounter() = default;
nsAutoString mName;
nsIFrame* mFrame; // weak reference (don't delete)
int32_t mCount;
ReflowCountMgr* mMgr; // weak reference (don't delete)
ReflowCounter mCounter;
bool mHasBeenOutput;
};
//--------------------
// Manager Class
//--------------------
class ReflowCountMgr {
public:
ReflowCountMgr();
virtual ~ReflowCountMgr();
void ClearTotals();
void ClearGrandTotals();
void DisplayTotals(const char* aStr);
void DisplayHTMLTotals(const char* aStr);
void DisplayDiffsInTotals();
void Add(const char* aName, nsIFrame* aFrame);
ReflowCounter* LookUp(const char* aName);
void PaintCount(const char* aName, gfxContext* aRenderingContext,
nsPresContext* aPresContext, nsIFrame* aFrame,
const nsPoint& aOffset, uint32_t aColor);
FILE* GetOutFile() { return mFD; }
void SetPresContext(nsPresContext* aPresContext) {
mPresContext = aPresContext; // weak reference
}
void SetPresShell(PresShell* aPresShell) {
mPresShell = aPresShell; // weak reference
}
void SetDumpFrameCounts(bool aVal) { mDumpFrameCounts = aVal; }
void SetDumpFrameByFrameCounts(bool aVal) { mDumpFrameByFrameCounts = aVal; }
void SetPaintFrameCounts(bool aVal) { mPaintFrameByFrameCounts = aVal; }
bool IsPaintingFrameCounts() { return mPaintFrameByFrameCounts; }
protected:
void DisplayTotals(uint32_t aTotal, uint32_t* aDupArray, char* aTitle);
void DisplayHTMLTotals(uint32_t aTotal, uint32_t* aDupArray, char* aTitle);
void DoGrandTotals();
void DoIndiTotalsTree();
// HTML Output Methods
void DoGrandHTMLTotals();
nsClassHashtable<nsCharPtrHashKey, ReflowCounter> mCounts;
nsClassHashtable<nsCharPtrHashKey, IndiReflowCounter> mIndiFrameCounts;
FILE* mFD;
bool mDumpFrameCounts;
bool mDumpFrameByFrameCounts;
bool mPaintFrameByFrameCounts;
bool mCycledOnce;
// Root Frame for Individual Tracking
nsPresContext* mPresContext;
PresShell* mPresShell;
// ReflowCountMgr gReflowCountMgr;
};
#endif
//========================================================================
// comment out to hide caret
#define SHOW_CARET
// The upper bound on the amount of time to spend reflowing, in
// microseconds. When this bound is exceeded and reflow commands are
// still queued up, a reflow event is posted. The idea is for reflow
// to not hog the processor beyond the time specifed in
// gMaxRCProcessingTime. This data member is initialized from the
// layout.reflow.timeslice pref.
#define NS_MAX_REFLOW_TIME 1000000
static int32_t gMaxRCProcessingTime = -1;
struct nsCallbackEventRequest {
nsIReflowCallback* callback;
nsCallbackEventRequest* next;
};
// ----------------------------------------------------------------------------
//
// NOTE(emilio): It'd be nice for this to assert that our document isn't in the
// bfcache, but font pref changes don't care about that, and maybe / probably
// shouldn't.
#ifdef DEBUG
# define ASSERT_REFLOW_SCHEDULED_STATE() \
{ \
if (ObservingLayoutFlushes()) { \
MOZ_ASSERT( \
mDocument->GetBFCacheEntry() || \
mPresContext->RefreshDriver()->IsLayoutFlushObserver(this), \
"Unexpected state"); \
} else { \
MOZ_ASSERT( \
!mPresContext->RefreshDriver()->IsLayoutFlushObserver(this), \
"Unexpected state"); \
} \
}
#else
# define ASSERT_REFLOW_SCHEDULED_STATE() /* nothing */
#endif
class nsAutoCauseReflowNotifier {
public:
MOZ_CAN_RUN_SCRIPT explicit nsAutoCauseReflowNotifier(PresShell* aPresShell)
: mPresShell(aPresShell) {
mPresShell->WillCauseReflow();
}
MOZ_CAN_RUN_SCRIPT ~nsAutoCauseReflowNotifier() {
// This check should not be needed. Currently the only place that seem
if (!mPresShell->mHaveShutDown) {
RefPtr<PresShell> presShell(mPresShell);
presShell->DidCauseReflow();
} else {
nsContentUtils::RemoveScriptBlocker();
}
}
PresShell* mPresShell;
};
class MOZ_STACK_CLASS nsPresShellEventCB : public EventDispatchingCallback {
public:
explicit nsPresShellEventCB(PresShell* aPresShell) : mPresShell(aPresShell) {}
MOZ_CAN_RUN_SCRIPT
virtual void HandleEvent(EventChainPostVisitor& aVisitor) override {
if (aVisitor.mPresContext && aVisitor.mEvent->mClass != eBasicEventClass) {
if (aVisitor.mEvent->mMessage == eMouseDown ||
aVisitor.mEvent->mMessage == eMouseUp) {
// Mouse-up and mouse-down events call nsIFrame::HandlePress/Release
// which call GetContentOffsetsFromPoint which requires up-to-date
// layout. Bring layout up-to-date now so that GetCurrentEventFrame()
// below will return a real frame and we don't have to worry about
// destroying it by flushing later.
MOZ_KnownLive(mPresShell)->FlushPendingNotifications(FlushType::Layout);
} else if (aVisitor.mEvent->mMessage == eWheel &&
aVisitor.mEventStatus != nsEventStatus_eConsumeNoDefault) {
nsIFrame* frame = mPresShell->GetCurrentEventFrame();
if (frame) {
// chrome (including addons) should be able to know if content
// handles both D3E "wheel" event and legacy mouse scroll events.
// We should dispatch legacy mouse events before dispatching the
// "wheel" event into system group.
RefPtr<EventStateManager> esm =
aVisitor.mPresContext->EventStateManager();
esm->DispatchLegacyMouseScrollEvents(
frame, aVisitor.mEvent->AsWheelEvent(), &aVisitor.mEventStatus);
}
}
nsIFrame* frame = mPresShell->GetCurrentEventFrame();
if (!frame && (aVisitor.mEvent->mMessage == eMouseUp ||
aVisitor.mEvent->mMessage == eTouchEnd)) {
// Redirect BUTTON_UP and TOUCH_END events to the root frame to ensure
// that capturing is released.
frame = mPresShell->GetRootFrame();
}
if (frame) {
frame->HandleEvent(aVisitor.mPresContext, aVisitor.mEvent->AsGUIEvent(),
&aVisitor.mEventStatus);
}
}
}
RefPtr<PresShell> mPresShell;
};
class nsBeforeFirstPaintDispatcher : public Runnable {
public:
explicit nsBeforeFirstPaintDispatcher(Document* aDocument)
: mozilla::Runnable("nsBeforeFirstPaintDispatcher"),
mDocument(aDocument) {}
// Fires the "before-first-paint" event so that interested parties (right now,
// the mobile browser) are aware of it.
NS_IMETHOD Run() override {
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->NotifyObservers(ToSupports(mDocument),
"before-first-paint", nullptr);
}
return NS_OK;
}
private:
RefPtr<Document> mDocument;
};
// This is a helper class to track whether the targeted frame is destroyed after
// dispatching pointer events. In that case, we need the original targeted
// content so that we can dispatch the mouse events to it.
class MOZ_STACK_CLASS AutoPointerEventTargetUpdater final {
public:
AutoPointerEventTargetUpdater(PresShell* aShell, WidgetEvent* aEvent,
nsIFrame* aFrame, nsIContent** aTargetContent) {
MOZ_ASSERT(aEvent);
if (!aTargetContent || aEvent->mClass != ePointerEventClass) {
// Make the destructor happy.
mTargetContent = nullptr;
return;
}
MOZ_ASSERT(aShell);
MOZ_ASSERT(aFrame);
MOZ_ASSERT(!aFrame->GetContent() ||
aShell->GetDocument() == aFrame->GetContent()->OwnerDoc());
mShell = aShell;
mWeakFrame = aFrame;
mTargetContent = aTargetContent;
aShell->mPointerEventTarget = aFrame->GetContent();
}
~AutoPointerEventTargetUpdater() {
if (!mTargetContent || !mShell || mWeakFrame.IsAlive()) {
return;
}
mShell->mPointerEventTarget.swap(*mTargetContent);
}
private:
RefPtr<PresShell> mShell;
AutoWeakFrame mWeakFrame;
nsIContent** mTargetContent;
};
bool PresShell::sDisableNonTestMouseEvents = false;
int16_t PresShell::sMouseButtons = MouseButtonsFlag::eNoButtons;
LazyLogModule PresShell::gLog("PresShell");
TimeStamp PresShell::EventHandler::sLastInputCreated;
TimeStamp PresShell::EventHandler::sLastInputProcessed;
StaticRefPtr<Element> PresShell::EventHandler::sLastKeyDownEventTargetElement;
bool PresShell::sProcessInteractable = false;
static bool gVerifyReflowEnabled;
bool PresShell::GetVerifyReflowEnable() {
#ifdef DEBUG
static bool firstTime = true;
if (firstTime) {
firstTime = false;
char* flags = PR_GetEnv("GECKO_VERIFY_REFLOW_FLAGS");
if (flags) {
bool error = false;
for (;;) {
char* comma = strchr(flags, ',');
if (comma) *comma = '\0';
bool found = false;
const VerifyReflowFlagData* flag = gFlags;
const VerifyReflowFlagData* limit = gFlags + NUM_VERIFY_REFLOW_FLAGS;
while (flag < limit) {
if (nsCRT::strcasecmp(flag->name, flags) == 0) {
gVerifyReflowFlags |= flag->bit;
found = true;
break;
}
++flag;
}
if (!found) error = true;
if (!comma) break;
*comma = ',';
flags = comma + 1;
}
if (error) ShowVerifyReflowFlags();
}
if (VerifyReflowFlags::On & gVerifyReflowFlags) {
gVerifyReflowEnabled = true;
printf("Note: verifyreflow is enabled");
if (VerifyReflowFlags::Noisy & gVerifyReflowFlags) {
printf(" (noisy)");
}
if (VerifyReflowFlags::All & gVerifyReflowFlags) {
printf(" (all)");
}
if (VerifyReflowFlags::DumpCommands & gVerifyReflowFlags) {
printf(" (show reflow commands)");
}
if (VerifyReflowFlags::NoisyCommands & gVerifyReflowFlags) {
printf(" (noisy reflow commands)");
if (VerifyReflowFlags::ReallyNoisyCommands & gVerifyReflowFlags) {
printf(" (REALLY noisy reflow commands)");
}
}
printf("\n");
}
}
#endif
return gVerifyReflowEnabled;
}
void PresShell::SetVerifyReflowEnable(bool aEnabled) {
gVerifyReflowEnabled = aEnabled;
}
void PresShell::AddAutoWeakFrame(AutoWeakFrame* aWeakFrame) {
if (aWeakFrame->GetFrame()) {
aWeakFrame->GetFrame()->AddStateBits(NS_FRAME_EXTERNAL_REFERENCE);
}
aWeakFrame->SetPreviousWeakFrame(mAutoWeakFrames);
mAutoWeakFrames = aWeakFrame;
}
void PresShell::AddWeakFrame(WeakFrame* aWeakFrame) {
if (aWeakFrame->GetFrame()) {
aWeakFrame->GetFrame()->AddStateBits(NS_FRAME_EXTERNAL_REFERENCE);
}
MOZ_ASSERT(!mWeakFrames.Contains(aWeakFrame));
mWeakFrames.Insert(aWeakFrame);
}
void PresShell::RemoveAutoWeakFrame(AutoWeakFrame* aWeakFrame) {
if (mAutoWeakFrames == aWeakFrame) {
mAutoWeakFrames = aWeakFrame->GetPreviousWeakFrame();
return;
}
AutoWeakFrame* nextWeak = mAutoWeakFrames;
while (nextWeak && nextWeak->GetPreviousWeakFrame() != aWeakFrame) {
nextWeak = nextWeak->GetPreviousWeakFrame();
}
if (nextWeak) {
nextWeak->SetPreviousWeakFrame(aWeakFrame->GetPreviousWeakFrame());
}
}
void PresShell::RemoveWeakFrame(WeakFrame* aWeakFrame) {
MOZ_ASSERT(mWeakFrames.Contains(aWeakFrame));
mWeakFrames.Remove(aWeakFrame);
}
already_AddRefed<nsFrameSelection> PresShell::FrameSelection() {
RefPtr<nsFrameSelection> ret = mSelection;
return ret.forget();
}
//----------------------------------------------------------------------
static uint32_t sNextPresShellId = 0;
/* static */
bool PresShell::AccessibleCaretEnabled(nsIDocShell* aDocShell) {
// If the pref forces it on, then enable it.
if (StaticPrefs::layout_accessiblecaret_enabled()) {
return true;
}
// If the touch pref is on, and touch events are enabled (this depends
// on the specific device running), then enable it.
if (StaticPrefs::layout_accessiblecaret_enabled_on_touch() &&
dom::TouchEvent::PrefEnabled(aDocShell)) {
return true;
}
// Otherwise, disabled.
return false;
}
PresShell::PresShell(Document* aDocument)
: mDocument(aDocument),
mViewManager(nullptr),
mFrameManager(nullptr),
mAutoWeakFrames(nullptr),
#ifdef ACCESSIBILITY
mDocAccessible(nullptr),
#endif // ACCESSIBILITY
mCurrentEventFrame(nullptr),
mMouseLocation(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE),
mLastResolutionChangeOrigin(ResolutionChangeOrigin::Apz),
mPaintCount(0),
mAPZFocusSequenceNumber(0),
mActiveSuppressDisplayport(0),
mPresShellId(++sNextPresShellId),
mFontSizeInflationEmPerLine(0),
mFontSizeInflationMinTwips(0),
mFontSizeInflationLineThreshold(0),
mSelectionFlags(nsISelectionDisplay::DISPLAY_TEXT |
nsISelectionDisplay::DISPLAY_IMAGES),
mChangeNestCount(0),
mRenderingStateFlags(RenderingStateFlags::None),
mInFlush(false),
mCaretEnabled(false),
mNeedLayoutFlush(true),
mNeedStyleFlush(true),
mNeedThrottledAnimationFlush(true),
mVisualViewportSizeSet(false),
mDidInitialize(false),
mIsDestroying(false),
mIsReflowing(false),
mIsObservingDocument(false),
mForbiddenToFlush(false),
mIsDocumentGone(false),
mHaveShutDown(false),
mPaintingSuppressed(false),
mLastRootReflowHadUnconstrainedBSize(false),
mShouldUnsuppressPainting(false),
mIgnoreFrameDestruction(false),
mIsActive(true),
mFrozen(false),
mIsFirstPaint(true),
mObservesMutationsForPrint(false),
mWasLastReflowInterrupted(false),
mObservingStyleFlushes(false),
mObservingLayoutFlushes(false),
mResizeEventPending(false),
mFontSizeInflationForceEnabled(false),
mFontSizeInflationDisabledInMasterProcess(false),
mFontSizeInflationEnabled(false),
mIsNeverPainting(false),
mResolutionUpdated(false),
mResolutionUpdatedByApz(false),
mUnderHiddenEmbedderElement(false),
mDocumentLoading(false),
mNoDelayedMouseEvents(false),
mNoDelayedKeyEvents(false),
mApproximateFrameVisibilityVisited(false),
mIsLastChromeOnlyEscapeKeyConsumed(false),
mHasReceivedPaintMessage(false),
mIsLastKeyDownCanceled(false),
mHasHandledUserInput(false),
mForceDispatchKeyPressEventsForNonPrintableKeys(false),
mForceUseLegacyKeyCodeAndCharCodeValues(false),
mInitializedWithKeyPressEventDispatchingBlacklist(false),
mMouseLocationWasSetBySynthesizedMouseEventForTests(false),
mHasTriedFastUnsuppress(false),
mProcessingReflowCommands(false),
mPendingDidDoReflow(false) {
MOZ_LOG(gLog, LogLevel::Debug, ("PresShell::PresShell this=%p", this));
MOZ_ASSERT(aDocument);
#ifdef MOZ_REFLOW_PERF
mReflowCountMgr = MakeUnique<ReflowCountMgr>();
mReflowCountMgr->SetPresContext(mPresContext);
mReflowCountMgr->SetPresShell(this);
#endif
mLastOSWake = mLoadBegin = TimeStamp::Now();
}
NS_INTERFACE_TABLE_HEAD(PresShell)
NS_INTERFACE_TABLE_BEGIN
// In most cases, PresShell should be treated as concrete class, but need to
// QI for weak reference. Therefore, the case needed by do_QueryReferent()
// should be tested first.
NS_INTERFACE_TABLE_ENTRY(PresShell, PresShell)
NS_INTERFACE_TABLE_ENTRY(PresShell, nsIDocumentObserver)
NS_INTERFACE_TABLE_ENTRY(PresShell, nsISelectionController)
NS_INTERFACE_TABLE_ENTRY(PresShell, nsISelectionDisplay)
NS_INTERFACE_TABLE_ENTRY(PresShell, nsIObserver)
NS_INTERFACE_TABLE_ENTRY(PresShell, nsISupportsWeakReference)
NS_INTERFACE_TABLE_ENTRY(PresShell, nsIMutationObserver)
NS_INTERFACE_TABLE_ENTRY_AMBIGUOUS(PresShell, nsISupports, nsIObserver)
NS_INTERFACE_TABLE_END
NS_INTERFACE_TABLE_TO_MAP_SEGUE
NS_INTERFACE_MAP_END
NS_IMPL_ADDREF(PresShell)
NS_IMPL_RELEASE(PresShell)
PresShell::~PresShell() {
MOZ_RELEASE_ASSERT(!mForbiddenToFlush,
"Flag should only be set temporarily, while doing things "
"that shouldn't cause destruction");
MOZ_LOG(gLog, LogLevel::Debug, ("PresShell::~PresShell this=%p", this));
if (!mHaveShutDown) {
MOZ_ASSERT_UNREACHABLE("Someone did not call PresShell::Destroy()");
Destroy();
}
NS_ASSERTION(mCurrentEventContentStack.Count() == 0,
"Huh, event content left on the stack in pres shell dtor!");
NS_ASSERTION(mFirstCallbackEventRequest == nullptr &&
mLastCallbackEventRequest == nullptr,
"post-reflow queues not empty. This means we're leaking");
MOZ_ASSERT(!mAllocatedPointers || mAllocatedPointers->IsEmpty(),
"Some pres arena objects were not freed");
mFrameManager = nullptr;
mFrameConstructor = nullptr;
mCurrentEventContent = nullptr;
}
/**
* Initialize the presentation shell. Create view manager and style
* manager.
* Note this can't be merged into our constructor because caret initialization
* calls AddRef() on us.
*/
void PresShell::Init(nsPresContext* aPresContext, nsViewManager* aViewManager) {
MOZ_ASSERT(mDocument);
MOZ_ASSERT(aPresContext);
MOZ_ASSERT(aViewManager);
MOZ_ASSERT(!mViewManager, "already initialized");
mViewManager = aViewManager;
// mDocument is now set. It might have a display document whose "need layout/
// style" flush flags are not set, but ours will be set. To keep these
// consistent, call the flag setting functions to propagate those flags up
// to the display document.
SetNeedLayoutFlush();
SetNeedStyleFlush();
// Create our frame constructor.
mFrameConstructor = MakeUnique<nsCSSFrameConstructor>(mDocument, this);
mFrameManager = mFrameConstructor.get();
// The document viewer owns both view manager and pres shell.
mViewManager->SetPresShell(this);
// Bind the context to the presentation shell.
// FYI: We cannot initialize mPresContext in the constructor because we
// cannot call AttachPresShell() in it and once we initialize
// mPresContext, other objects may refer refresh driver or restyle
// manager via mPresContext and that causes hitting MOZ_ASSERT in some
// places. Therefore, we should initialize mPresContext here with
// const_cast hack since we want to guarantee that mPresContext lives
// as long as the PresShell.
const_cast<RefPtr<nsPresContext>&>(mPresContext) = aPresContext;
mPresContext->AttachPresShell(this);
mPresContext->InitFontCache();
// being eagerly registered as a style flush observer. This shouldn't be
// needed otherwise.
EnsureStyleFlush();
const bool accessibleCaretEnabled =
AccessibleCaretEnabled(mDocument->GetDocShell());
if (accessibleCaretEnabled) {
// Need to happen before nsFrameSelection has been set up.
mAccessibleCaretEventHub = new AccessibleCaretEventHub(this);
mAccessibleCaretEventHub->Init();
}
mSelection = new nsFrameSelection(this, nullptr, accessibleCaretEnabled);
// Important: this has to happen after the selection has been set up
#ifdef SHOW_CARET
// make the caret
mCaret = new nsCaret();
mCaret->Init(this);
mOriginalCaret = mCaret;
// SetCaretEnabled(true); // make it show in browser windows
#endif
// set up selection to be displayed in document
// Don't enable selection for print media
nsPresContext::nsPresContextType type = mPresContext->Type();
if (type != nsPresContext::eContext_PrintPreview &&
type != nsPresContext::eContext_Print) {
SetDisplaySelection(nsISelectionController::SELECTION_DISABLED);
}
if (gMaxRCProcessingTime == -1) {
gMaxRCProcessingTime =
Preferences::GetInt("layout.reflow.timeslice", NS_MAX_REFLOW_TIME);
}
if (nsStyleSheetService* ss = nsStyleSheetService::GetInstance()) {
ss->RegisterPresShell(this);
}
{
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
os->AddObserver(this, "memory-pressure", false);
os->AddObserver(this, NS_WIDGET_WAKE_OBSERVER_TOPIC, false);
if (XRE_IsParentProcess() && !sProcessInteractable) {
os->AddObserver(this, "sessionstore-one-or-no-tab-restored", false);
}
os->AddObserver(this, "font-info-updated", false);
os->AddObserver(this, "internal-look-and-feel-changed", false);
}
}
#ifdef MOZ_REFLOW_PERF
if (mReflowCountMgr) {
bool paintFrameCounts =
Preferences::GetBool("layout.reflow.showframecounts");
bool dumpFrameCounts =
Preferences::GetBool("layout.reflow.dumpframecounts");
bool dumpFrameByFrameCounts =
Preferences::GetBool("layout.reflow.dumpframebyframecounts");
mReflowCountMgr->SetDumpFrameCounts(dumpFrameCounts);
mReflowCountMgr->SetDumpFrameByFrameCounts(dumpFrameByFrameCounts);
mReflowCountMgr->SetPaintFrameCounts(paintFrameCounts);
}
#endif
if (mDocument->HasAnimationController()) {
SMILAnimationController* animCtrl = mDocument->GetAnimationController();
animCtrl->NotifyRefreshDriverCreated(GetPresContext()->RefreshDriver());
}
for (DocumentTimeline* timeline : mDocument->Timelines()) {
timeline->NotifyRefreshDriverCreated(GetPresContext()->RefreshDriver());
}
// Get our activeness from the docShell.
ActivenessMaybeChanged();
// Setup our font inflation preferences.
mFontSizeInflationEmPerLine = StaticPrefs::font_size_inflation_emPerLine();
mFontSizeInflationMinTwips = StaticPrefs::font_size_inflation_minTwips();
mFontSizeInflationLineThreshold =
StaticPrefs::font_size_inflation_lineThreshold();
mFontSizeInflationForceEnabled =
StaticPrefs::font_size_inflation_forceEnabled();
mFontSizeInflationDisabledInMasterProcess =
StaticPrefs::font_size_inflation_disabledInMasterProcess();
// We'll compute the font size inflation state in Initialize(), when we know
// the document type.
mTouchManager.Init(this, mDocument);
if (mPresContext->IsRootContentDocumentCrossProcess()) {
mZoomConstraintsClient = new ZoomConstraintsClient();
mZoomConstraintsClient->Init(this, mDocument);
// We call this to create mMobileViewportManager, if it is needed.
MaybeRecreateMobileViewportManager(false);
}
if (nsCOMPtr<nsIDocShell> docShell = mPresContext->GetDocShell()) {
if (BrowsingContext* bc = docShell->GetBrowsingContext()) {
mUnderHiddenEmbedderElement = bc->IsUnderHiddenEmbedderElement();
}
}
}
enum TextPerfLogType { eLog_reflow, eLog_loaddone, eLog_totals };
static void LogTextPerfStats(gfxTextPerfMetrics* aTextPerf,
PresShell* aPresShell,
const gfxTextPerfMetrics::TextCounts& aCounts,
float aTime, TextPerfLogType aLogType,
const char* aURL) {
LogModule* tpLog = gfxPlatform::GetLog(eGfxLog_textperf);
// ignore XUL contexts unless at debug level
mozilla::LogLevel logLevel = LogLevel::Warning;
if (aCounts.numContentTextRuns == 0) {
logLevel = LogLevel::Debug;
}
if (!MOZ_LOG_TEST(tpLog, logLevel)) {
return;
}
char prefix[256];
switch (aLogType) {
case eLog_reflow:
SprintfLiteral(prefix, "(textperf-reflow) %p time-ms: %7.0f", aPresShell,
aTime);
break;
case eLog_loaddone:
SprintfLiteral(prefix, "(textperf-loaddone) %p time-ms: %7.0f",
aPresShell, aTime);
break;
default:
MOZ_ASSERT(aLogType == eLog_totals, "unknown textperf log type");
SprintfLiteral(prefix, "(textperf-totals) %p", aPresShell);
}
double hitRatio = 0.0;
uint32_t lookups = aCounts.wordCacheHit + aCounts.wordCacheMiss;
if (lookups) {
hitRatio = double(aCounts.wordCacheHit) / double(lookups);
}
if (aLogType == eLog_loaddone) {
MOZ_LOG(
tpLog, logLevel,
("%s reflow: %d chars: %d "
"[%s] "
"content-textruns: %d chrome-textruns: %d "
"max-textrun-len: %d "
"word-cache-lookups: %d word-cache-hit-ratio: %4.3f "
"word-cache-space: %d word-cache-long: %d "
"pref-fallbacks: %d system-fallbacks: %d "
"textruns-const: %d textruns-destr: %d "
"generic-lookups: %d "
"cumulative-textruns-destr: %d\n",
prefix, aTextPerf->reflowCount, aCounts.numChars, (aURL ? aURL : ""),
aCounts.numContentTextRuns, aCounts.numChromeTextRuns,
aCounts.maxTextRunLen, lookups, hitRatio, aCounts.wordCacheSpaceRules,
aCounts.wordCacheLong, aCounts.fallbackPrefs, aCounts.fallbackSystem,
aCounts.textrunConst, aCounts.textrunDestr, aCounts.genericLookups,
aTextPerf->cumulative.textrunDestr));
} else {
MOZ_LOG(
tpLog, logLevel,
("%s reflow: %d chars: %d "
"content-textruns: %d chrome-textruns: %d "
"max-textrun-len: %d "
"word-cache-lookups: %d word-cache-hit-ratio: %4.3f "
"word-cache-space: %d word-cache-long: %d "
"pref-fallbacks: %d system-fallbacks: %d "
"textruns-const: %d textruns-destr: %d "
"generic-lookups: %d "
"cumulative-textruns-destr: %d\n",
prefix, aTextPerf->reflowCount, aCounts.numChars,
aCounts.numContentTextRuns, aCounts.numChromeTextRuns,
aCounts.maxTextRunLen, lookups, hitRatio, aCounts.wordCacheSpaceRules,
aCounts.wordCacheLong, aCounts.fallbackPrefs, aCounts.fallbackSystem,
aCounts.textrunConst, aCounts.textrunDestr, aCounts.genericLookups,
aTextPerf->cumulative.textrunDestr));
}
}
bool PresShell::InRDMPane() {
if (Document* doc = GetDocument()) {
if (BrowsingContext* bc = doc->GetBrowsingContext()) {
return bc->InRDMPane();
}
}
return false;
}
#if defined(MOZ_WIDGET_ANDROID)
void PresShell::MaybeNotifyShowDynamicToolbar() {
const DynamicToolbarState dynToolbarState = GetDynamicToolbarState();
if ((dynToolbarState == DynamicToolbarState::Collapsed ||
dynToolbarState == DynamicToolbarState::InTransition)) {
MOZ_ASSERT(mPresContext &&
mPresContext->IsRootContentDocumentCrossProcess());
if (BrowserChild* browserChild = BrowserChild::GetFrom(this)) {
browserChild->SendShowDynamicToolbar();
}
}
}
#endif // defined(MOZ_WIDGET_ANDROID)
void PresShell::Destroy() {
// Do not add code before this line please!
if (mHaveShutDown) {
return;
}
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"destroy called on presshell while scripts not blocked");
[[maybe_unused]] nsIURI* uri = mDocument->GetDocumentURI();
AUTO_PROFILER_LABEL_DYNAMIC_NSCSTRING_RELEVANT_FOR_JS(
"Layout tree destruction", LAYOUT_Destroy,
uri ? uri->GetSpecOrDefault() : "N/A"_ns);
// Try to determine if the page is the user had a meaningful opportunity to
// zoom this page. This is not 100% accurate but should be "good enough" for
// telemetry purposes.
auto isUserZoomablePage = [&]() -> bool {
if (mIsFirstPaint) {
// Page was never painted, so it wasn't zoomable by the user. We get a
// handful of these "transient" presShells.
return false;
}
if (!mPresContext->IsRootContentDocumentCrossProcess()) {
// Not a root content document, so APZ doesn't support zooming it.
return false;
}
if (InRDMPane()) {
// Responsive design mode is a special case that we want to ignore here.
return false;
}
if (mDocument && mDocument->IsInitialDocument()) {
// Ignore initial about:blank page loads
return false;
}
if (XRE_IsContentProcess() &&
IsExtensionRemoteType(ContentChild::GetSingleton()->GetRemoteType())) {
// Also omit presShells from the extension process because they sometimes
// can't be zoomed by the user.
return false;
}
// Otherwise assume the page is user-zoomable.
return true;
};
if (isUserZoomablePage()) {
Telemetry::Accumulate(Telemetry::APZ_ZOOM_ACTIVITY,
IsResolutionUpdatedByApz());
}
// dump out cumulative text perf metrics
gfxTextPerfMetrics* tp;
if (mPresContext && (tp = mPresContext->GetTextPerfMetrics())) {
tp->Accumulate();
if (tp->cumulative.numChars > 0) {
LogTextPerfStats(tp, this, tp->cumulative, 0.0, eLog_totals, nullptr);
}
}
if (mPresContext) {
if (gfxUserFontSet* fs = mPresContext->GetUserFontSet()) {
uint32_t fontCount;
uint64_t fontSize;
fs->GetLoadStatistics(fontCount, fontSize);
Telemetry::Accumulate(Telemetry::WEBFONT_PER_PAGE, fontCount);
Telemetry::Accumulate(Telemetry::WEBFONT_SIZE_PER_PAGE,
uint32_t(fontSize / 1024));
} else {
Telemetry::Accumulate(Telemetry::WEBFONT_PER_PAGE, 0);
Telemetry::Accumulate(Telemetry::WEBFONT_SIZE_PER_PAGE, 0);
}
}
#ifdef MOZ_REFLOW_PERF
DumpReflows();
mReflowCountMgr = nullptr;
#endif
if (mZoomConstraintsClient) {
mZoomConstraintsClient->Destroy();
mZoomConstraintsClient = nullptr;
}
if (mMobileViewportManager) {
mMobileViewportManager->Destroy();
mMobileViewportManager = nullptr;
mMVMContext = nullptr;
}
#ifdef ACCESSIBILITY
if (mDocAccessible) {
# ifdef DEBUG
if (a11y::logging::IsEnabled(a11y::logging::eDocDestroy))
a11y::logging::DocDestroy("presshell destroyed", mDocument);
# endif
mDocAccessible->Shutdown();
mDocAccessible = nullptr;
}
#endif // ACCESSIBILITY
MaybeReleaseCapturingContent();
EventHandler::OnPresShellDestroy(mDocument);
if (mContentToScrollTo) {
mContentToScrollTo->RemoveProperty(nsGkAtoms::scrolling);
mContentToScrollTo = nullptr;
}
if (mPresContext) {
// We need to notify the destroying the nsPresContext to ESM for
// suppressing to use from ESM.
mPresContext->EventStateManager()->NotifyDestroyPresContext(mPresContext);
}
if (nsStyleSheetService* ss = nsStyleSheetService::GetInstance()) {
ss->UnregisterPresShell(this);
}
{
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
os->RemoveObserver(this, "memory-pressure");
os->RemoveObserver(this, NS_WIDGET_WAKE_OBSERVER_TOPIC);
if (XRE_IsParentProcess()) {
os->RemoveObserver(this, "sessionstore-one-or-no-tab-restored");
}
os->RemoveObserver(this, "font-info-updated");
os->RemoveObserver(this, "internal-look-and-feel-changed");
}
}
// If our paint suppression timer is still active, kill it.
CancelPaintSuppressionTimer();
// Same for our reflow continuation timer
if (mReflowContinueTimer) {
mReflowContinueTimer->Cancel();
mReflowContinueTimer = nullptr;
}
mSynthMouseMoveEvent.Revoke();
mUpdateApproximateFrameVisibilityEvent.Revoke();
ClearApproximatelyVisibleFramesList(Some(OnNonvisible::DiscardImages));
if (mCaret) {
mCaret->Terminate();
mCaret = nullptr;
}
mFocusedFrameSelection = nullptr;
if (mSelection) {
RefPtr<nsFrameSelection> frameSelection = mSelection;
frameSelection->DisconnectFromPresShell();
}
mIsDestroying = true;
// We can't release all the event content in
// mCurrentEventContentStack here since there might be code on the
// stack that will release the event content too. Double release
// bad!
// The frames will be torn down, so remove them from the current
// event frame stack (since they'd be dangling references if we'd
// leave them in) and null out the mCurrentEventFrame pointer as
// well.
mCurrentEventFrame = nullptr;
int32_t i, count = mCurrentEventFrameStack.Length();
for (i = 0; i < count; i++) {
mCurrentEventFrameStack[i] = nullptr;
}
mFramesToDirty.Clear();
mPendingScrollAnchorSelection.Clear();
mPendingScrollAnchorAdjustment.Clear();
mPendingScrollResnap.Clear();
if (mViewManager) {
// Clear the view manager's weak pointer back to |this| in case it
// was leaked.
mViewManager->SetPresShell(nullptr);
mViewManager = nullptr;
}
nsRefreshDriver* rd = GetPresContext()->RefreshDriver();
// This shell must be removed from the document before the frame
// hierarchy is torn down to avoid finding deleted frames through
// this presshell while the frames are being torn down
if (mDocument) {
NS_ASSERTION(mDocument->GetPresShell() == this, "Wrong shell?");
mDocument->ClearServoRestyleRoot();
mDocument->DeletePresShell();
if (mDocument->HasAnimationController()) {
mDocument->GetAnimationController()->NotifyRefreshDriverDestroying(rd);
}
for (DocumentTimeline* timeline : mDocument->Timelines()) {
timeline->NotifyRefreshDriverDestroying(rd);
}
}
if (mPresContext) {
rd->CancelPendingAnimationEvents(mPresContext->AnimationEventDispatcher());
}
// Revoke any pending events. We need to do this and cancel pending reflows
// before we destroy the frame manager, since apparently frame destruction
// sometimes spins the event queue when plug-ins are involved(!).
// XXXmats is this still needed now that plugins are gone?
StopObservingRefreshDriver();
if (rd->GetPresContext() == GetPresContext()) {
rd->RevokeViewManagerFlush();
rd->ClearHasScheduleFlush();
}
CancelAllPendingReflows();
CancelPostedReflowCallbacks();
// Destroy the frame manager. This will destroy the frame hierarchy
mFrameConstructor->WillDestroyFrameTree();
NS_WARNING_ASSERTION(!mAutoWeakFrames && mWeakFrames.IsEmpty(),
"Weak frames alive after destroying FrameManager");
while (mAutoWeakFrames) {
mAutoWeakFrames->Clear(this);
}
const nsTArray<WeakFrame*> weakFrames = ToArray(mWeakFrames);
for (WeakFrame* weakFrame : weakFrames) {
weakFrame->Clear(this);
}
// Terminate AccessibleCaretEventHub after tearing down the frame tree so that
// we don't need to remove caret element's frame in
// AccessibleCaret::RemoveCaretElement().
if (mAccessibleCaretEventHub) {
mAccessibleCaretEventHub->Terminate();
mAccessibleCaretEventHub = nullptr;
}
if (mPresContext) {
// We hold a reference to the pres context, and it holds a weak link back
// to us. To avoid the pres context having a dangling reference, set its
// pres shell to nullptr
mPresContext->DetachPresShell();
}
mHaveShutDown = true;
mTouchManager.Destroy();
}
void PresShell::StopObservingRefreshDriver() {
nsRefreshDriver* rd = mPresContext->RefreshDriver();
if (mResizeEventPending) {
rd->RemoveResizeEventFlushObserver(this);
}
if (mObservingLayoutFlushes) {
rd->RemoveLayoutFlushObserver(this);
}
if (mObservingStyleFlushes) {
rd->RemoveStyleFlushObserver(this);
}
}
void PresShell::StartObservingRefreshDriver() {
nsRefreshDriver* rd = mPresContext->RefreshDriver();
if (mResizeEventPending) {
rd->AddResizeEventFlushObserver(this);
}
if (mObservingLayoutFlushes) {
rd->AddLayoutFlushObserver(this);
}
if (mObservingStyleFlushes) {
rd->AddStyleFlushObserver(this);
}
}
nsRefreshDriver* PresShell::GetRefreshDriver() const {
return mPresContext ? mPresContext->RefreshDriver() : nullptr;
}
void PresShell::SetAuthorStyleDisabled(bool aStyleDisabled) {
if (aStyleDisabled != StyleSet()->GetAuthorStyleDisabled()) {
StyleSet()->SetAuthorStyleDisabled(aStyleDisabled);
mDocument->ApplicableStylesChanged();
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->NotifyObservers(
ToSupports(mDocument), "author-style-disabled-changed", nullptr);
}
}
}
bool PresShell::GetAuthorStyleDisabled() const {
return StyleSet()->GetAuthorStyleDisabled();
}
void PresShell::AddUserSheet(StyleSheet* aSheet) {
// Make sure this does what nsDocumentViewer::CreateStyleSet does wrt
// ordering. We want this new sheet to come after all the existing stylesheet
// service sheets (which are at the start), but before other user sheets; see
// nsIStyleSheetService.idl for the ordering.
nsStyleSheetService* sheetService = nsStyleSheetService::GetInstance();
nsTArray<RefPtr<StyleSheet>>& userSheets = *sheetService->UserStyleSheets();
// Search for the place to insert the new user sheet. Since all of the
// stylesheet service provided user sheets should be at the start of the style
// set's list, and aSheet should be at the end of userSheets. Given that, we
// can find the right place to insert the new sheet based on the length of
// userSheets.
MOZ_ASSERT(aSheet);
MOZ_ASSERT(userSheets.LastElement() == aSheet);
size_t index = userSheets.Length() - 1;
// Assert that all of userSheets (except for the last, new element) matches up
// with what's in the style set.
for (size_t i = 0; i < index; ++i) {
MOZ_ASSERT(StyleSet()->SheetAt(StyleOrigin::User, i) == userSheets[i]);
}
if (index == static_cast<size_t>(StyleSet()->SheetCount(StyleOrigin::User))) {
StyleSet()->AppendStyleSheet(*aSheet);
} else {
StyleSheet* ref = StyleSet()->SheetAt(StyleOrigin::User, index);
StyleSet()->InsertStyleSheetBefore(*aSheet, *ref);
}
mDocument->ApplicableStylesChanged();
}
void PresShell::AddAgentSheet(StyleSheet* aSheet) {
// Make sure this does what nsDocumentViewer::CreateStyleSet does
// wrt ordering.
StyleSet()->AppendStyleSheet(*aSheet);
mDocument->ApplicableStylesChanged();
}
void PresShell::AddAuthorSheet(StyleSheet* aSheet) {
// Document specific "additional" Author sheets should be stronger than the
// ones added with the StyleSheetService.
StyleSheet* firstAuthorSheet = mDocument->GetFirstAdditionalAuthorSheet();
if (firstAuthorSheet) {
StyleSet()->InsertStyleSheetBefore(*aSheet, *firstAuthorSheet);
} else {
StyleSet()->AppendStyleSheet(*aSheet);
}
mDocument->ApplicableStylesChanged();
}
bool PresShell::FixUpFocus() {
if (NS_WARN_IF(!mDocument)) {
return false;
}
nsIContent* currentFocus = mDocument->GetUnretargetedFocusedContent(
Document::IncludeChromeOnly::Yes);
if (!currentFocus) {
return false;
}
nsIFrame* f = currentFocus->GetPrimaryFrame();
if (f && f->IsFocusable()) {
return false;
}
if (currentFocus == mDocument->GetBody() ||
currentFocus == mDocument->GetRootElement()) {
return false;
}
RefPtr fm = nsFocusManager::GetFocusManager();
nsCOMPtr<nsPIDOMWindowOuter> window = mDocument->GetWindow();
if (NS_WARN_IF(!window)) {
return false;
}
fm->ClearFocus(window);
return true;
}
void PresShell::SelectionWillTakeFocus() {
if (mSelection) {
FrameSelectionWillTakeFocus(*mSelection);
}
}
void PresShell::SelectionWillLoseFocus() {
// Do nothing, the main selection is the default focused selection.
}
// Selection repainting code relies on selection offsets being properly
// notifying.
static void RepaintNormalSelectionWhenSafe(nsFrameSelection& aFrameSelection) {
if (nsContentUtils::IsSafeToRunScript()) {
aFrameSelection.RepaintSelection(SelectionType::eNormal);
return;
}
// Note that importantly we don't defer changing the DisplaySelection. That'd
// be potentially racy with other code that may change it.
nsContentUtils::AddScriptRunner(NS_NewRunnableFunction(
"RepaintNormalSelectionWhenSafe",
[sel = RefPtr<nsFrameSelection>(&aFrameSelection)] {
sel->RepaintSelection(SelectionType::eNormal);
}));
}
void PresShell::FrameSelectionWillLoseFocus(nsFrameSelection& aFrameSelection) {
if (mFocusedFrameSelection != &aFrameSelection) {
return;
}
// Do nothing, the main selection is the default focused selection.
if (&aFrameSelection == mSelection) {
return;
}
RefPtr<nsFrameSelection> old = std::move(mFocusedFrameSelection);
MOZ_ASSERT(!mFocusedFrameSelection);
if (old->GetDisplaySelection() != nsISelectionController::SELECTION_HIDDEN) {
old->SetDisplaySelection(nsISelectionController::SELECTION_HIDDEN);
RepaintNormalSelectionWhenSafe(*old);
}
if (mSelection) {
FrameSelectionWillTakeFocus(*mSelection);
}
}
void PresShell::FrameSelectionWillTakeFocus(nsFrameSelection& aFrameSelection) {
if (mFocusedFrameSelection == &aFrameSelection) {
#ifdef XP_MACOSX
// FIXME: Mac needs to update the global selection cache, even if the
// document's focused selection doesn't change, and this is currently done
// from RepaintSelection. Maybe we should move part of the global selection
// handling here, or something of that sort, unclear.
RepaintNormalSelectionWhenSafe(aFrameSelection);
#endif
return;
}
RefPtr<nsFrameSelection> old = std::move(mFocusedFrameSelection);
mFocusedFrameSelection = &aFrameSelection;
if (old &&
old->GetDisplaySelection() != nsISelectionController::SELECTION_HIDDEN) {
old->SetDisplaySelection(nsISelectionController::SELECTION_HIDDEN);
RepaintNormalSelectionWhenSafe(*old);
}
if (aFrameSelection.GetDisplaySelection() !=
nsISelectionController::SELECTION_ON) {
aFrameSelection.SetDisplaySelection(nsISelectionController::SELECTION_ON);
RepaintNormalSelectionWhenSafe(aFrameSelection);
}
}