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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
#include "HTMLSelectEventListener.h"
#include "nsListControlFrame.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/MouseEvent.h"
#include "mozilla/Casting.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/TextEvents.h"
#include "mozilla/PresShell.h"
#include "mozilla/dom/HTMLSelectElement.h"
#include "mozilla/dom/HTMLOptionElement.h"
#include "mozilla/StaticPrefs_ui.h"
#include "mozilla/ClearOnShutdown.h"
using namespace mozilla;
using namespace mozilla::dom;
static bool IsOptionInteractivelySelectable(HTMLSelectElement& aSelect,
HTMLOptionElement& aOption,
bool aIsCombobox) {
if (aSelect.IsOptionDisabled(&aOption)) {
return false;
}
if (!aIsCombobox) {
return aOption.GetPrimaryFrame();
}
// In dropdown mode no options have frames, but we can check whether they
// are rendered / not in a display: none subtree.
if (!aOption.HasServoData() || Servo_Element_IsDisplayNone(&aOption)) {
return false;
}
// TODO(emilio): This is a bit silly and doesn't match the options that we
// show / don't show in the dropdown, but matches the frame construction we
// do for multiple selects. For backwards compat also don't allow selecting
// options in a display: contents subtree interactively.
// test_select_key_navigation_bug1498769.html tests for this and should
// probably be changed (and this loop removed) or alternatively
// SelectChild.sys.mjs should be changed to match it.
for (Element* el = &aOption; el && el != &aSelect;
el = el->GetParentElement()) {
if (Servo_Element_IsDisplayContents(el)) {
return false;
}
}
return true;
}
namespace mozilla {
static StaticAutoPtr<nsString> sIncrementalString;
static TimeStamp gLastKeyTime;
static uintptr_t sLastKeyListener = 0;
static constexpr int32_t kNothingSelected = -1;
static nsString& GetIncrementalString() {
MOZ_ASSERT(sLastKeyListener != 0);
if (!sIncrementalString) {
sIncrementalString = new nsString();
ClearOnShutdown(&sIncrementalString);
}
return *sIncrementalString;
}
class MOZ_RAII AutoIncrementalSearchHandler {
public:
explicit AutoIncrementalSearchHandler(HTMLSelectEventListener& aListener) {
if (sLastKeyListener != uintptr_t(&aListener)) {
sLastKeyListener = uintptr_t(&aListener);
GetIncrementalString().Truncate();
// To make it easier to handle time comparisons in the other methods,
// initialize gLastKeyTime to a value in the past.
gLastKeyTime = TimeStamp::Now() -
TimeDuration::FromMilliseconds(
StaticPrefs::ui_menu_incremental_search_timeout() * 2);
}
}
~AutoIncrementalSearchHandler() {
if (!mResettingCancelled) {
GetIncrementalString().Truncate();
}
}
void CancelResetting() { mResettingCancelled = true; }
private:
bool mResettingCancelled = false;
};
NS_IMPL_ISUPPORTS(HTMLSelectEventListener, nsIMutationObserver,
nsIDOMEventListener)
HTMLSelectEventListener::~HTMLSelectEventListener() {
if (sLastKeyListener == uintptr_t(this)) {
sLastKeyListener = 0;
}
}
nsListControlFrame* HTMLSelectEventListener::GetListControlFrame() const {
if (mIsCombobox) {
MOZ_ASSERT(!mElement->GetPrimaryFrame() ||
!mElement->GetPrimaryFrame()->IsListControlFrame());
return nullptr;
}
return do_QueryFrame(mElement->GetPrimaryFrame());
}
int32_t HTMLSelectEventListener::GetEndSelectionIndex() const {
if (auto* lf = GetListControlFrame()) {
return lf->GetEndSelectionIndex();
}
// Combobox selects only have one selected index, so the end and start is the
// same.
return mElement->SelectedIndex();
}
bool HTMLSelectEventListener::IsOptionInteractivelySelectable(
uint32_t aIndex) const {
HTMLOptionElement* option = mElement->Item(aIndex);
return option &&
::IsOptionInteractivelySelectable(*mElement, *option, mIsCombobox);
}
//---------------------------------------------------------------------
// Ok, the entire idea of this routine is to move to the next item that
// is suppose to be selected. If the item is disabled then we search in
// the same direction looking for the next item to select. If we run off
// the end of the list then we start at the end of the list and search
// backwards until we get back to the original item or an enabled option
//
// aStartIndex - the index to start searching from
// aNewIndex - will get set to the new index if it finds one
// aNumOptions - the total number of options in the list
// aDoAdjustInc - the initial index increment / decrement
// aDoAdjustIncNext - the subsequent index increment/decrement used to search
// for the next enabled option
//
// the aDoAdjustInc could be a "1" for a single item or
// any number greater representing a page of items
//
void HTMLSelectEventListener::AdjustIndexForDisabledOpt(
int32_t aStartIndex, int32_t& aNewIndex, int32_t aNumOptions,
int32_t aDoAdjustInc, int32_t aDoAdjustIncNext) {
// Cannot select anything if there is nothing to select
if (aNumOptions == 0) {
aNewIndex = kNothingSelected;
return;
}
// means we reached the end of the list and now we are searching backwards
bool doingReverse = false;
// lowest index in the search range
int32_t bottom = 0;
// highest index in the search range
int32_t top = aNumOptions;
// Start off keyboard options at selectedIndex if nothing else is defaulted to
//
// XXX Perhaps this should happen for mouse too, to start off shift click
// automatically in multiple ... to do this, we'd need to override
// OnOptionSelected and set mStartSelectedIndex if nothing is selected. Not
// sure of the effects, though, so I'm not doing it just yet.
int32_t startIndex = aStartIndex;
if (startIndex < bottom) {
startIndex = mElement->SelectedIndex();
}
int32_t newIndex = startIndex + aDoAdjustInc;
// make sure we start off in the range
if (newIndex < bottom) {
newIndex = 0;
} else if (newIndex >= top) {
newIndex = aNumOptions - 1;
}
while (true) {
// if the newIndex is selectable, we are golden, bail out
if (IsOptionInteractivelySelectable(newIndex)) {
break;
}
// it WAS disabled, so sart looking ahead for the next enabled option
newIndex += aDoAdjustIncNext;
// well, if we reach end reverse the search
if (newIndex < bottom) {
if (doingReverse) {
return; // if we are in reverse mode and reach the end bail out
}
// reset the newIndex to the end of the list we hit
// reverse the incrementer
// set the other end of the list to our original starting index
newIndex = bottom;
aDoAdjustIncNext = 1;
doingReverse = true;
top = startIndex;
} else if (newIndex >= top) {
if (doingReverse) {
return; // if we are in reverse mode and reach the end bail out
}
// reset the newIndex to the end of the list we hit
// reverse the incrementer
// set the other end of the list to our original starting index
newIndex = top - 1;
aDoAdjustIncNext = -1;
doingReverse = true;
bottom = startIndex;
}
}
// Looks like we found one
aNewIndex = newIndex;
}
NS_IMETHODIMP
HTMLSelectEventListener::HandleEvent(dom::Event* aEvent) {
nsAutoString eventType;
aEvent->GetType(eventType);
if (eventType.EqualsLiteral("keydown")) {
return KeyDown(aEvent);
}
if (eventType.EqualsLiteral("keypress")) {
return KeyPress(aEvent);
}
if (eventType.EqualsLiteral("mousedown")) {
if (aEvent->DefaultPrevented()) {
return NS_OK;
}
return MouseDown(aEvent);
}
if (eventType.EqualsLiteral("mouseup")) {
// Don't try to honor defaultPrevented here - it's not web compatible.
return MouseUp(aEvent);
}
if (eventType.EqualsLiteral("mousemove")) {
// I don't think we want to honor defaultPrevented on mousemove
// in general, and it would only prevent highlighting here.
return MouseMove(aEvent);
}
MOZ_ASSERT_UNREACHABLE("Unexpected eventType");
return NS_OK;
}
void HTMLSelectEventListener::Attach() {
mElement->AddSystemEventListener(u"keydown"_ns, this, false, false);
mElement->AddSystemEventListener(u"keypress"_ns, this, false, false);
mElement->AddSystemEventListener(u"mousedown"_ns, this, false, false);
mElement->AddSystemEventListener(u"mouseup"_ns, this, false, false);
mElement->AddSystemEventListener(u"mousemove"_ns, this, false, false);
if (mIsCombobox) {
mElement->AddMutationObserver(this);
}
}
void HTMLSelectEventListener::Detach() {
mElement->RemoveSystemEventListener(u"keydown"_ns, this, false);
mElement->RemoveSystemEventListener(u"keypress"_ns, this, false);
mElement->RemoveSystemEventListener(u"mousedown"_ns, this, false);
mElement->RemoveSystemEventListener(u"mouseup"_ns, this, false);
mElement->RemoveSystemEventListener(u"mousemove"_ns, this, false);
if (mIsCombobox) {
mElement->RemoveMutationObserver(this);
if (mElement->OpenInParentProcess()) {
nsContentUtils::AddScriptRunner(NS_NewRunnableFunction(
"HTMLSelectEventListener::Detach", [element = mElement] {
// Don't hide the dropdown if the element has another frame already,
//
// FIXME(emilio): The flush is needed to deal with reframes started
// from DOM node removal. But perhaps we can be a bit smarter here.
if (!element->IsCombobox() ||
!element->GetPrimaryFrame(FlushType::Frames)) {
nsContentUtils::DispatchChromeEvent(
element->OwnerDoc(), element, u"mozhidedropdown"_ns,
CanBubble::eYes, Cancelable::eNo);
}
}));
}
}
}
const uint32_t kMaxDropdownRows = 20; // matches the setting for 4.x browsers
int32_t HTMLSelectEventListener::ItemsPerPage() const {
uint32_t size = [&] {
if (mIsCombobox) {
return kMaxDropdownRows;
}
if (auto* lf = GetListControlFrame()) {
return lf->GetNumDisplayRows();
}
return mElement->Size();
}();
if (size <= 1) {
return 1;
}
if (MOZ_UNLIKELY(size > INT32_MAX)) {
return INT32_MAX - 1;
}
return AssertedCast<int32_t>(size - 1u);
}
void HTMLSelectEventListener::OptionValueMightHaveChanged(
nsIContent* aMutatingNode) {
#ifdef ACCESSIBILITY
if (nsAccessibilityService* acc = GetAccService()) {
acc->ComboboxOptionMaybeChanged(mElement->OwnerDoc()->GetPresShell(),
aMutatingNode);
}
#endif
}
void HTMLSelectEventListener::AttributeChanged(dom::Element* aElement,
int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue) {
if (aElement->IsHTMLElement(nsGkAtoms::option) &&
aNameSpaceID == kNameSpaceID_None && aAttribute == nsGkAtoms::label) {
// A11y has its own mutation listener for this so no need to do
// OptionValueMightHaveChanged().
ComboboxMightHaveChanged();
}
}
void HTMLSelectEventListener::CharacterDataChanged(
nsIContent* aContent, const CharacterDataChangeInfo&) {
if (nsContentUtils::IsInSameAnonymousTree(mElement, aContent)) {
OptionValueMightHaveChanged(aContent);
ComboboxMightHaveChanged();
}
}
void HTMLSelectEventListener::ContentRemoved(nsIContent* aChild,
nsIContent* aPreviousSibling) {
if (nsContentUtils::IsInSameAnonymousTree(mElement, aChild)) {
OptionValueMightHaveChanged(aChild);
ComboboxMightHaveChanged();
}
}
void HTMLSelectEventListener::ContentAppended(nsIContent* aFirstNewContent) {
if (nsContentUtils::IsInSameAnonymousTree(mElement, aFirstNewContent)) {
OptionValueMightHaveChanged(aFirstNewContent);
ComboboxMightHaveChanged();
}
}
void HTMLSelectEventListener::ContentInserted(nsIContent* aChild) {
if (nsContentUtils::IsInSameAnonymousTree(mElement, aChild)) {
OptionValueMightHaveChanged(aChild);
ComboboxMightHaveChanged();
}
}
void HTMLSelectEventListener::ComboboxMightHaveChanged() {
if (nsIFrame* f = mElement->GetPrimaryFrame()) {
PresShell* ps = f->PresShell();
// nsComoboxControlFrame::Reflow updates the selected text. AddOption /
// RemoveOption / etc takes care of keeping the displayed index up to date.
ps->FrameNeedsReflow(f, IntrinsicDirty::FrameAncestorsAndDescendants,
NS_FRAME_IS_DIRTY);
#ifdef ACCESSIBILITY
if (nsAccessibilityService* acc = GetAccService()) {
acc->ScheduleAccessibilitySubtreeUpdate(ps, mElement);
}
#endif
}
}
void HTMLSelectEventListener::FireOnInputAndOnChange() {
RefPtr<HTMLSelectElement> element = mElement;
element->UserFinishedInteracting(/* aChanged = */ true);
}
static void FireDropDownEvent(HTMLSelectElement* aElement, bool aShow,
bool aIsSourceTouchEvent) {
const auto eventName = [&] {
if (aShow) {
return aIsSourceTouchEvent ? u"mozshowdropdown-sourcetouch"_ns
: u"mozshowdropdown"_ns;
}
return u"mozhidedropdown"_ns;
}();
nsContentUtils::DispatchChromeEvent(aElement->OwnerDoc(), aElement, eventName,
CanBubble::eYes, Cancelable::eNo);
}
nsresult HTMLSelectEventListener::MouseDown(dom::Event* aMouseEvent) {
NS_ASSERTION(aMouseEvent != nullptr, "aMouseEvent is null.");
MouseEvent* mouseEvent = aMouseEvent->AsMouseEvent();
NS_ENSURE_TRUE(mouseEvent, NS_ERROR_FAILURE);
if (mElement->State().HasState(ElementState::DISABLED)) {
return NS_OK;
}
// only allow selection with the left button
// if a right button click is on the combobox itself
// or on the select when in listbox mode, then let the click through
const bool isLeftButton = mouseEvent->Button() == 0;
if (!isLeftButton) {
return NS_OK;
}
if (mIsCombobox) {
uint16_t inputSource = mouseEvent->InputSource();
if (mElement->OpenInParentProcess()) {
nsCOMPtr<nsIContent> target = do_QueryInterface(aMouseEvent->GetTarget());
if (target && target->IsHTMLElement(nsGkAtoms::option)) {
return NS_OK;
}
}
const bool isSourceTouchEvent =
inputSource == MouseEvent_Binding::MOZ_SOURCE_TOUCH;
FireDropDownEvent(mElement, !mElement->OpenInParentProcess(),
isSourceTouchEvent);
return NS_OK;
}
if (nsListControlFrame* list = GetListControlFrame()) {
mButtonDown = true;
return list->HandleLeftButtonMouseDown(aMouseEvent);
}
return NS_OK;
}
nsresult HTMLSelectEventListener::MouseUp(dom::Event* aMouseEvent) {
NS_ASSERTION(aMouseEvent != nullptr, "aMouseEvent is null.");
MouseEvent* mouseEvent = aMouseEvent->AsMouseEvent();
NS_ENSURE_TRUE(mouseEvent, NS_ERROR_FAILURE);
mButtonDown = false;
if (mElement->State().HasState(ElementState::DISABLED)) {
return NS_OK;
}
if (nsListControlFrame* lf = GetListControlFrame()) {
lf->CaptureMouseEvents(false);
}
// only allow selection with the left button
// if a right button click is on the combobox itself
// or on the select when in listbox mode, then let the click through
const bool isLeftButton = mouseEvent->Button() == 0;
if (!isLeftButton) {
return NS_OK;
}
if (nsListControlFrame* lf = GetListControlFrame()) {
return lf->HandleLeftButtonMouseUp(aMouseEvent);
}
return NS_OK;
}
nsresult HTMLSelectEventListener::MouseMove(dom::Event* aMouseEvent) {
NS_ASSERTION(aMouseEvent != nullptr, "aMouseEvent is null.");
MouseEvent* mouseEvent = aMouseEvent->AsMouseEvent();
NS_ENSURE_TRUE(mouseEvent, NS_ERROR_FAILURE);
if (!mButtonDown) {
return NS_OK;
}
if (nsListControlFrame* lf = GetListControlFrame()) {
return lf->DragMove(aMouseEvent);
}
return NS_OK;
}
nsresult HTMLSelectEventListener::KeyPress(dom::Event* aKeyEvent) {
MOZ_ASSERT(aKeyEvent, "aKeyEvent is null.");
if (mElement->State().HasState(ElementState::DISABLED)) {
return NS_OK;
}
AutoIncrementalSearchHandler incrementalHandler(*this);
const WidgetKeyboardEvent* keyEvent =
aKeyEvent->WidgetEventPtr()->AsKeyboardEvent();
MOZ_ASSERT(keyEvent,
"DOM event must have WidgetKeyboardEvent for its internal event");
// Select option with this as the first character
// XXX Not I18N compliant
// Don't do incremental search if the key event has already consumed.
if (keyEvent->DefaultPrevented()) {
return NS_OK;
}
if (keyEvent->IsAlt()) {
return NS_OK;
}
// With some keyboard layout, space key causes non-ASCII space.
// So, the check in keydown event handler isn't enough, we need to check it
// again with keypress event.
if (keyEvent->mCharCode != ' ') {
mControlSelectMode = false;
}
const bool isControlOrMeta =
keyEvent->IsControl()
#if !defined(XP_WIN) && !defined(MOZ_WIDGET_GTK)
// Ignore Windows Logo key press in Win/Linux because it's not a usual
// modifier for applications. Here wants to check "Accel" like modifier.
|| keyEvent->IsMeta()
#endif
;
if (isControlOrMeta && keyEvent->mCharCode != ' ') {
return NS_OK;
}
// NOTE: If mKeyCode of keypress event is not 0, mCharCode is always 0.
// Therefore, all non-printable keys are not handled after this block.
if (!keyEvent->mCharCode) {
// Backspace key will delete the last char in the string. Otherwise,
// non-printable keypress should reset incremental search.
if (keyEvent->mKeyCode == NS_VK_BACK) {
incrementalHandler.CancelResetting();
if (!GetIncrementalString().IsEmpty()) {
GetIncrementalString().Truncate(GetIncrementalString().Length() - 1);
}
aKeyEvent->PreventDefault();
} else {
// XXX When a select element has focus, even if the key causes nothing,
// it might be better to call preventDefault() here because nobody
// should expect one of other elements including chrome handles the
// key event.
}
return NS_OK;
}
incrementalHandler.CancelResetting();
// We ate the key if we got this far.
aKeyEvent->PreventDefault();
// XXX Why don't we check/modify timestamp first?
// Incremental Search: if time elapsed is below
// ui.menu.incremental_search.timeout, append this keystroke to the search
// string we will use to find options and start searching at the current
// keystroke. Otherwise, Truncate the string if it's been a long time
// since our last keypress.
if ((keyEvent->mTimeStamp - gLastKeyTime).ToMilliseconds() >
StaticPrefs::ui_menu_incremental_search_timeout()) {
// If this is ' ' and we are at the beginning of the string, treat it as
if (keyEvent->mCharCode == ' ') {
// Actually process the new index and let the selection code
// do the scrolling for us
PostHandleKeyEvent(GetEndSelectionIndex(), keyEvent->mCharCode,
keyEvent->IsShift(), isControlOrMeta);
return NS_OK;
}
GetIncrementalString().Truncate();
}
gLastKeyTime = keyEvent->mTimeStamp;
// Append this keystroke to the search string.
char16_t uniChar = ToLowerCase(static_cast<char16_t>(keyEvent->mCharCode));
GetIncrementalString().Append(uniChar);
// match the first one
nsAutoString incrementalString(GetIncrementalString());
uint32_t charIndex = 1, stringLength = incrementalString.Length();
while (charIndex < stringLength &&
incrementalString[charIndex] == incrementalString[charIndex - 1]) {
charIndex++;
}
if (charIndex == stringLength) {
incrementalString.Truncate(1);
stringLength = 1;
}
// Determine where we're going to start reading the string
// If we have multiple characters to look for, we start looking *at* the
// current option. If we have only one character to look for, we start
// looking *after* the current option.
// Exception: if there is no option selected to start at, we always start
// *at* 0.
int32_t startIndex = mElement->SelectedIndex();
if (startIndex == kNothingSelected) {
startIndex = 0;
} else if (stringLength == 1) {
startIndex++;
}
// now make sure there are options or we are wasting our time
RefPtr<dom::HTMLOptionsCollection> options = mElement->Options();
uint32_t numOptions = options->Length();
for (uint32_t i = 0; i < numOptions; ++i) {
uint32_t index = (i + startIndex) % numOptions;
RefPtr<dom::HTMLOptionElement> optionElement = options->ItemAsOption(index);
if (!optionElement || !::IsOptionInteractivelySelectable(
*mElement, *optionElement, mIsCombobox)) {
continue;
}
nsAutoString text;
optionElement->GetRenderedLabel(text);
if (!StringBeginsWith(
nsContentUtils::TrimWhitespace<
nsContentUtils::IsHTMLWhitespaceOrNBSP>(text, false),
incrementalString, nsCaseInsensitiveStringComparator)) {
continue;
}
if (mIsCombobox) {
if (optionElement->Selected()) {
return NS_OK;
}
optionElement->SetSelected(true);
FireOnInputAndOnChange();
return NS_OK;
}
if (nsListControlFrame* lf = GetListControlFrame()) {
bool wasChanged =
lf->PerformSelection(index, keyEvent->IsShift(), isControlOrMeta);
if (!wasChanged) {
return NS_OK;
}
FireOnInputAndOnChange();
}
break;
}
return NS_OK;
}
nsresult HTMLSelectEventListener::KeyDown(dom::Event* aKeyEvent) {
MOZ_ASSERT(aKeyEvent, "aKeyEvent is null.");
if (mElement->State().HasState(ElementState::DISABLED)) {
return NS_OK;
}
AutoIncrementalSearchHandler incrementalHandler(*this);
if (aKeyEvent->DefaultPrevented()) {
return NS_OK;
}
const WidgetKeyboardEvent* keyEvent =
aKeyEvent->WidgetEventPtr()->AsKeyboardEvent();
MOZ_ASSERT(keyEvent,
"DOM event must have WidgetKeyboardEvent for its internal event");
bool dropDownMenuOnUpDown;
bool dropDownMenuOnSpace;
#ifdef XP_MACOSX
dropDownMenuOnUpDown = mIsCombobox && !mElement->OpenInParentProcess();
dropDownMenuOnSpace = mIsCombobox && !keyEvent->IsAlt() &&
!keyEvent->IsControl() && !keyEvent->IsMeta();
#else
dropDownMenuOnUpDown = mIsCombobox && keyEvent->IsAlt();
dropDownMenuOnSpace = mIsCombobox && !mElement->OpenInParentProcess();
#endif
bool withinIncrementalSearchTime =
(keyEvent->mTimeStamp - gLastKeyTime).ToMilliseconds() <=
StaticPrefs::ui_menu_incremental_search_timeout();
if ((dropDownMenuOnUpDown &&
(keyEvent->mKeyCode == NS_VK_UP || keyEvent->mKeyCode == NS_VK_DOWN)) ||
(dropDownMenuOnSpace && keyEvent->mKeyCode == NS_VK_SPACE &&
!withinIncrementalSearchTime)) {
FireDropDownEvent(mElement, !mElement->OpenInParentProcess(), false);
aKeyEvent->PreventDefault();
return NS_OK;
}
if (keyEvent->IsAlt()) {
return NS_OK;
}
// We should not change the selection if the popup is "opened in the parent
// process" (even when we're in single-process mode).
const bool shouldSelect = !mIsCombobox || !mElement->OpenInParentProcess();
// now make sure there are options or we are wasting our time
RefPtr<dom::HTMLOptionsCollection> options = mElement->Options();
uint32_t numOptions = options->Length();
// this is the new index to set
int32_t newIndex = kNothingSelected;
bool isControlOrMeta =
keyEvent->IsControl()
#if !defined(XP_WIN) && !defined(MOZ_WIDGET_GTK)
// Ignore Windows Logo key press in Win/Linux because it's not a usual
// modifier for applications. Here wants to check "Accel" like modifier.
|| keyEvent->IsMeta()
#endif
;
// Don't try to handle multiple-select pgUp/pgDown in single-select lists.
if (isControlOrMeta && !mElement->Multiple() &&
(keyEvent->mKeyCode == NS_VK_PAGE_UP ||
keyEvent->mKeyCode == NS_VK_PAGE_DOWN)) {
return NS_OK;
}
if (isControlOrMeta &&
(keyEvent->mKeyCode == NS_VK_UP || keyEvent->mKeyCode == NS_VK_LEFT ||
keyEvent->mKeyCode == NS_VK_DOWN || keyEvent->mKeyCode == NS_VK_RIGHT ||
keyEvent->mKeyCode == NS_VK_HOME || keyEvent->mKeyCode == NS_VK_END)) {
// Don't go into multiple-select mode unless this list can handle it.
isControlOrMeta = mControlSelectMode = mElement->Multiple();
} else if (keyEvent->mKeyCode != NS_VK_SPACE) {
mControlSelectMode = false;
}
switch (keyEvent->mKeyCode) {
case NS_VK_UP:
case NS_VK_LEFT:
if (shouldSelect) {
AdjustIndexForDisabledOpt(GetEndSelectionIndex(), newIndex,
int32_t(numOptions), -1, -1);
}
break;
case NS_VK_DOWN:
case NS_VK_RIGHT:
if (shouldSelect) {
AdjustIndexForDisabledOpt(GetEndSelectionIndex(), newIndex,
int32_t(numOptions), 1, 1);
}
break;
case NS_VK_RETURN:
// If this is single select listbox, Enter key doesn't cause anything.
if (!mElement->Multiple()) {
return NS_OK;
}
newIndex = GetEndSelectionIndex();
break;
case NS_VK_PAGE_UP: {
if (shouldSelect) {
AdjustIndexForDisabledOpt(GetEndSelectionIndex(), newIndex,
int32_t(numOptions), -ItemsPerPage(), -1);
}
break;
}
case NS_VK_PAGE_DOWN: {
if (shouldSelect) {
AdjustIndexForDisabledOpt(GetEndSelectionIndex(), newIndex,
int32_t(numOptions), ItemsPerPage(), 1);
}
break;
}
case NS_VK_HOME:
if (shouldSelect) {
AdjustIndexForDisabledOpt(0, newIndex, int32_t(numOptions), 0, 1);
}
break;
case NS_VK_END:
if (shouldSelect) {
AdjustIndexForDisabledOpt(int32_t(numOptions) - 1, newIndex,
int32_t(numOptions), 0, -1);
}
break;
default: // printable key will be handled by keypress event.
incrementalHandler.CancelResetting();
return NS_OK;
}
aKeyEvent->PreventDefault();
// Actually process the new index and let the selection code
// do the scrolling for us
PostHandleKeyEvent(newIndex, 0, keyEvent->IsShift(), isControlOrMeta);
return NS_OK;
}
HTMLOptionElement* HTMLSelectEventListener::GetCurrentOption() const {
// The mEndSelectionIndex is what is currently being selected. Use
// the selected index if this is kNothingSelected.
int32_t endIndex = GetEndSelectionIndex();
int32_t focusedIndex =
endIndex == kNothingSelected ? mElement->SelectedIndex() : endIndex;
if (focusedIndex != kNothingSelected) {
return mElement->Item(AssertedCast<uint32_t>(focusedIndex));
}
// There is no selected option. Return the first non-disabled option, if any.
return GetNonDisabledOptionFrom(0);
}
HTMLOptionElement* HTMLSelectEventListener::GetNonDisabledOptionFrom(
int32_t aFromIndex, int32_t* aFoundIndex) const {
const uint32_t length = mElement->Length();
for (uint32_t i = std::max(aFromIndex, 0); i < length; ++i) {
if (IsOptionInteractivelySelectable(i)) {
if (aFoundIndex) {
*aFoundIndex = i;
}
return mElement->Item(i);
}
}
return nullptr;
}
void HTMLSelectEventListener::PostHandleKeyEvent(int32_t aNewIndex,
uint32_t aCharCode,
bool aIsShift,
bool aIsControlOrMeta) {
if (aNewIndex == kNothingSelected) {
int32_t endIndex = GetEndSelectionIndex();
int32_t focusedIndex =
endIndex == kNothingSelected ? mElement->SelectedIndex() : endIndex;
if (focusedIndex != kNothingSelected) {
return;
}
// No options are selected. In this case the focus ring is on the first
// non-disabled option (if any), so we should behave as if that's the option
// the user acted on.
if (!GetNonDisabledOptionFrom(0, &aNewIndex)) {
return;
}
}
if (mIsCombobox) {
RefPtr<HTMLOptionElement> newOption = mElement->Item(aNewIndex);
MOZ_ASSERT(newOption);
if (newOption->Selected()) {
return;
}
newOption->SetSelected(true);
FireOnInputAndOnChange();
return;
}
if (nsListControlFrame* lf = GetListControlFrame()) {
lf->UpdateSelectionAfterKeyEvent(aNewIndex, aCharCode, aIsShift,
aIsControlOrMeta, mControlSelectMode);
}
}
} // namespace mozilla