gecko-dev/widget/TextEventDispatcher.cpp

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25 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "mozilla/Preferences.h"
#include "mozilla/TextEvents.h"
#include "mozilla/TextEventDispatcher.h"
#include "nsIDocShell.h"
#include "nsIFrame.h"
#include "nsIPresShell.h"
#include "nsIWidget.h"
#include "nsPIDOMWindow.h"
#include "nsView.h"
namespace mozilla {
namespace widget {
/******************************************************************************
* TextEventDispatcher
*****************************************************************************/
bool TextEventDispatcher::sDispatchKeyEventsDuringComposition = false;
TextEventDispatcher::TextEventDispatcher(nsIWidget* aWidget)
: mWidget(aWidget)
, mDispatchingEvent(0)
, mInputTransactionType(eNoInputTransaction)
, mIsComposing(false)
{
MOZ_RELEASE_ASSERT(mWidget, "aWidget must not be nullptr");
static bool sInitialized = false;
if (!sInitialized) {
Preferences::AddBoolVarCache(
&sDispatchKeyEventsDuringComposition,
"dom.keyboardevent.dispatch_during_composition",
false);
sInitialized = true;
}
}
nsresult
TextEventDispatcher::BeginInputTransaction(
TextEventDispatcherListener* aListener)
{
return BeginInputTransactionInternal(aListener,
eSameProcessSyncInputTransaction);
}
nsresult
TextEventDispatcher::BeginTestInputTransaction(
TextEventDispatcherListener* aListener,
bool aIsAPZAware)
{
return BeginInputTransactionInternal(aListener,
aIsAPZAware ? eAsyncTestInputTransaction :
eSameProcessSyncTestInputTransaction);
}
nsresult
TextEventDispatcher::BeginNativeInputTransaction()
{
if (NS_WARN_IF(!mWidget)) {
return NS_ERROR_FAILURE;
}
RefPtr<TextEventDispatcherListener> listener =
mWidget->GetNativeTextEventDispatcherListener();
if (NS_WARN_IF(!listener)) {
return NS_ERROR_FAILURE;
}
return BeginInputTransactionInternal(listener, eNativeInputTransaction);
}
nsresult
TextEventDispatcher::BeginInputTransactionInternal(
TextEventDispatcherListener* aListener,
InputTransactionType aType)
{
if (NS_WARN_IF(!aListener)) {
return NS_ERROR_INVALID_ARG;
}
nsCOMPtr<TextEventDispatcherListener> listener = do_QueryReferent(mListener);
if (listener) {
if (listener == aListener && mInputTransactionType == aType) {
return NS_OK;
}
// If this has composition or is dispatching an event, any other listener
// can steal ownership. Especially, if the latter case is allowed,
// nobody cannot begin input transaction with this if a modal dialog is
// opened during dispatching an event.
if (IsComposing() || IsDispatchingEvent()) {
return NS_ERROR_ALREADY_INITIALIZED;
}
}
mListener = do_GetWeakReference(aListener);
mInputTransactionType = aType;
if (listener && listener != aListener) {
listener->OnRemovedFrom(this);
}
return NS_OK;
}
void
TextEventDispatcher::EndInputTransaction(TextEventDispatcherListener* aListener)
{
if (NS_WARN_IF(IsComposing()) || NS_WARN_IF(IsDispatchingEvent())) {
return;
}
mInputTransactionType = eNoInputTransaction;
nsCOMPtr<TextEventDispatcherListener> listener = do_QueryReferent(mListener);
if (NS_WARN_IF(!listener)) {
return;
}
if (NS_WARN_IF(listener != aListener)) {
return;
}
mListener = nullptr;
listener->OnRemovedFrom(this);
}
void
TextEventDispatcher::OnDestroyWidget()
{
mWidget = nullptr;
mPendingComposition.Clear();
nsCOMPtr<TextEventDispatcherListener> listener = do_QueryReferent(mListener);
mListener = nullptr;
mInputTransactionType = eNoInputTransaction;
if (listener) {
listener->OnRemovedFrom(this);
}
}
nsresult
TextEventDispatcher::GetState() const
{
nsCOMPtr<TextEventDispatcherListener> listener = do_QueryReferent(mListener);
if (!listener) {
return NS_ERROR_NOT_INITIALIZED;
}
if (!mWidget || mWidget->Destroyed()) {
return NS_ERROR_NOT_AVAILABLE;
}
return NS_OK;
}
void
TextEventDispatcher::InitEvent(WidgetGUIEvent& aEvent) const
{
aEvent.mTime = PR_IntervalNow();
aEvent.mRefPoint = LayoutDeviceIntPoint(0, 0);
aEvent.mFlags.mIsSynthesizedForTests = IsForTests();
if (aEvent.mClass != eCompositionEventClass) {
return;
}
void* pseudoIMEContext = GetPseudoIMEContext();
if (pseudoIMEContext) {
aEvent.AsCompositionEvent()->mNativeIMEContext.
InitWithRawNativeIMEContext(pseudoIMEContext);
}
#ifdef DEBUG
else {
MOZ_ASSERT(!XRE_IsContentProcess(),
"Why did the content process start native event transaction?");
MOZ_ASSERT(aEvent.AsCompositionEvent()->mNativeIMEContext.IsValid(),
"Native IME context shouldn't be invalid");
}
#endif // #ifdef DEBUG
}
nsresult
TextEventDispatcher::DispatchEvent(nsIWidget* aWidget,
WidgetGUIEvent& aEvent,
nsEventStatus& aStatus)
{
MOZ_ASSERT(!aEvent.AsInputEvent(), "Use DispatchInputEvent()");
RefPtr<TextEventDispatcher> kungFuDeathGrip(this);
nsCOMPtr<nsIWidget> widget(aWidget);
mDispatchingEvent++;
nsresult rv = widget->DispatchEvent(&aEvent, aStatus);
mDispatchingEvent--;
return rv;
}
nsresult
TextEventDispatcher::DispatchInputEvent(nsIWidget* aWidget,
WidgetInputEvent& aEvent,
nsEventStatus& aStatus)
{
RefPtr<TextEventDispatcher> kungFuDeathGrip(this);
nsCOMPtr<nsIWidget> widget(aWidget);
mDispatchingEvent++;
// If the event is dispatched via nsIWidget::DispatchInputEvent(), it
// sends the event to the parent process first since APZ needs to handle it
// first. However, some callers (e.g., keyboard apps on B2G and tests
// expecting synchronous dispatch) don't want this to do that.
nsresult rv = NS_OK;
if (ShouldSendInputEventToAPZ()) {
aStatus = widget->DispatchInputEvent(&aEvent);
} else {
rv = widget->DispatchEvent(&aEvent, aStatus);
}
mDispatchingEvent--;
return rv;
}
nsresult
TextEventDispatcher::StartComposition(nsEventStatus& aStatus,
const WidgetEventTime* aEventTime)
{
aStatus = nsEventStatus_eIgnore;
nsresult rv = GetState();
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (NS_WARN_IF(mIsComposing)) {
return NS_ERROR_FAILURE;
}
mIsComposing = true;
WidgetCompositionEvent compositionStartEvent(true, eCompositionStart,
mWidget);
InitEvent(compositionStartEvent);
if (aEventTime) {
compositionStartEvent.AssignEventTime(*aEventTime);
}
rv = DispatchEvent(mWidget, compositionStartEvent, aStatus);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
nsresult
TextEventDispatcher::StartCompositionAutomaticallyIfNecessary(
nsEventStatus& aStatus,
const WidgetEventTime* aEventTime)
{
if (IsComposing()) {
return NS_OK;
}
nsresult rv = StartComposition(aStatus, aEventTime);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// If started composition has already been committed, we shouldn't dispatch
// the compositionchange event.
if (!IsComposing()) {
aStatus = nsEventStatus_eConsumeNoDefault;
return NS_OK;
}
// Note that the widget might be destroyed during a call of
// StartComposition(). In such case, we shouldn't keep dispatching next
// event.
rv = GetState();
if (NS_FAILED(rv)) {
MOZ_ASSERT(rv != NS_ERROR_NOT_INITIALIZED,
"aDispatcher must still be initialized in this case");
aStatus = nsEventStatus_eConsumeNoDefault;
return NS_OK; // Don't throw exception in this case
}
aStatus = nsEventStatus_eIgnore;
return NS_OK;
}
nsresult
TextEventDispatcher::CommitComposition(nsEventStatus& aStatus,
const nsAString* aCommitString,
const WidgetEventTime* aEventTime)
{
aStatus = nsEventStatus_eIgnore;
nsresult rv = GetState();
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// When there is no composition, caller shouldn't try to commit composition
// with non-existing composition string nor commit composition with empty
// string.
if (NS_WARN_IF(!IsComposing() &&
(!aCommitString || aCommitString->IsEmpty()))) {
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIWidget> widget(mWidget);
rv = StartCompositionAutomaticallyIfNecessary(aStatus, aEventTime);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (aStatus == nsEventStatus_eConsumeNoDefault) {
return NS_OK;
}
// End current composition and make this free for other IMEs.
mIsComposing = false;
EventMessage message = aCommitString ? eCompositionCommit :
eCompositionCommitAsIs;
WidgetCompositionEvent compositionCommitEvent(true, message, widget);
InitEvent(compositionCommitEvent);
if (aEventTime) {
compositionCommitEvent.AssignEventTime(*aEventTime);
}
if (message == eCompositionCommit) {
compositionCommitEvent.mData = *aCommitString;
// Don't send CRLF, replace it with LF here.
compositionCommitEvent.mData.ReplaceSubstring(NS_LITERAL_STRING("\r\n"),
NS_LITERAL_STRING("\n"));
}
rv = DispatchEvent(widget, compositionCommitEvent, aStatus);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
nsresult
TextEventDispatcher::NotifyIME(const IMENotification& aIMENotification)
{
nsresult rv = NS_ERROR_NOT_IMPLEMENTED;
// First, send the notification to current input transaction's listener.
nsCOMPtr<TextEventDispatcherListener> listener = do_QueryReferent(mListener);
if (listener) {
rv = listener->NotifyIME(this, aIMENotification);
}
if (mInputTransactionType == eNativeInputTransaction || !mWidget) {
return rv;
}
// If current input transaction isn't for native event handler, we should
// send the notification to the native text event dispatcher listener
// since native event handler may need to do something from
// TextEventDispatcherListener::NotifyIME() even before there is no
// input transaction yet. For example, native IME handler may need to
// create new context at receiving NOTIFY_IME_OF_FOCUS. In this case,
// mListener may not be initialized since input transaction should be
// initialized immediately before dispatching every WidgetKeyboardEvent
// and WidgetCompositionEvent (dispatching events always occurs after
// focus move).
nsCOMPtr<TextEventDispatcherListener> nativeListener =
mWidget->GetNativeTextEventDispatcherListener();
if (!nativeListener) {
return rv;
}
switch (aIMENotification.mMessage) {
case REQUEST_TO_COMMIT_COMPOSITION:
case REQUEST_TO_CANCEL_COMPOSITION:
// It's not necessary to notify native IME of requests.
return rv;
default: {
// Even if current input transaction's listener returns NS_OK or
// something, we need to notify native IME of notifications because
// when user typing after TIP does something, the changed information
// is necessary for them.
nsresult rv2 =
nativeListener->NotifyIME(this, aIMENotification);
// But return the result from current listener except when the
// notification isn't handled.
return rv == NS_ERROR_NOT_IMPLEMENTED ? rv2 : rv;
}
}
}
bool
TextEventDispatcher::DispatchKeyboardEvent(
EventMessage aMessage,
const WidgetKeyboardEvent& aKeyboardEvent,
nsEventStatus& aStatus,
void* aData)
{
return DispatchKeyboardEventInternal(aMessage, aKeyboardEvent, aStatus,
aData);
}
bool
TextEventDispatcher::DispatchKeyboardEventInternal(
EventMessage aMessage,
const WidgetKeyboardEvent& aKeyboardEvent,
nsEventStatus& aStatus,
void* aData,
uint32_t aIndexOfKeypress)
{
// Note that this method is also used for dispatching key events on a plugin
// because key events on a plugin should be dispatched same as normal key
// events. Then, only some handlers which need to intercept key events
// before the focused plugin (e.g., reserved shortcut key handlers) can
// consume the events.
MOZ_ASSERT(WidgetKeyboardEvent::IsKeyDownOrKeyDownOnPlugin(aMessage) ||
WidgetKeyboardEvent::IsKeyUpOrKeyUpOnPlugin(aMessage) ||
aMessage == eKeyPress, "Invalid aMessage value");
nsresult rv = GetState();
if (NS_WARN_IF(NS_FAILED(rv))) {
return false;
}
// If the key shouldn't cause keypress events, don't this patch them.
if (aMessage == eKeyPress && !aKeyboardEvent.ShouldCauseKeypressEvents()) {
return false;
}
// Basically, key events shouldn't be dispatched during composition.
// Note that plugin process has different IME context. Therefore, we don't
// need to check our composition state when the key event is fired on a
// plugin.
if (IsComposing() && !WidgetKeyboardEvent::IsKeyEventOnPlugin(aMessage)) {
// However, if we need to behave like other browsers, we need the keydown
// and keyup events. Note that this behavior is also allowed by D3E spec.
// FYI: keypress events must not be fired during composition.
if (!sDispatchKeyEventsDuringComposition || aMessage == eKeyPress) {
return false;
}
// XXX If there was mOnlyContentDispatch for this case, it might be useful
// because our chrome doesn't assume that key events are fired during
// composition.
}
WidgetKeyboardEvent keyEvent(true, aMessage, mWidget);
InitEvent(keyEvent);
keyEvent.AssignKeyEventData(aKeyboardEvent, false);
if (aStatus == nsEventStatus_eConsumeNoDefault) {
// If the key event should be dispatched as consumed event, marking it here.
// This is useful to prevent double action. E.g., when the key was already
// handled by system, our chrome shouldn't handle it.
keyEvent.PreventDefaultBeforeDispatch();
}
// Corrects each member for the specific key event type.
if (keyEvent.mKeyNameIndex != KEY_NAME_INDEX_USE_STRING) {
MOZ_ASSERT(!aIndexOfKeypress,
"aIndexOfKeypress must be 0 for non-printable key");
// If the keyboard event isn't caused by printable key, its charCode should
// be 0.
keyEvent.SetCharCode(0);
} else {
if (WidgetKeyboardEvent::IsKeyDownOrKeyDownOnPlugin(aMessage) ||
WidgetKeyboardEvent::IsKeyUpOrKeyUpOnPlugin(aMessage)) {
MOZ_RELEASE_ASSERT(!aIndexOfKeypress,
"aIndexOfKeypress must be 0 for either eKeyDown or eKeyUp");
} else {
MOZ_RELEASE_ASSERT(
!aIndexOfKeypress || aIndexOfKeypress < keyEvent.mKeyValue.Length(),
"aIndexOfKeypress must be 0 - mKeyValue.Length() - 1");
}
wchar_t ch =
keyEvent.mKeyValue.IsEmpty() ? 0 : keyEvent.mKeyValue[aIndexOfKeypress];
keyEvent.SetCharCode(static_cast<uint32_t>(ch));
if (aMessage == eKeyPress) {
// keyCode of eKeyPress events of printable keys should be always 0.
keyEvent.mKeyCode = 0;
// eKeyPress events are dispatched for every character.
// So, each key value of eKeyPress events should be a character.
if (ch) {
keyEvent.mKeyValue.Assign(ch);
} else {
keyEvent.mKeyValue.Truncate();
}
}
}
if (WidgetKeyboardEvent::IsKeyUpOrKeyUpOnPlugin(aMessage)) {
// mIsRepeat of keyup event must be false.
keyEvent.mIsRepeat = false;
}
// mIsComposing should be initialized later.
keyEvent.mIsComposing = false;
if (mInputTransactionType == eNativeInputTransaction) {
// Copy mNativeKeyEvent here because for safety for other users of
// AssignKeyEventData(), it doesn't copy this.
keyEvent.mNativeKeyEvent = aKeyboardEvent.mNativeKeyEvent;
} else {
// If it's not a keyboard event for native key event, we should ensure that
// mNativeKeyEvent and mPluginEvent are null/empty.
keyEvent.mNativeKeyEvent = nullptr;
keyEvent.mPluginEvent.Clear();
}
// TODO: Manage mUniqueId here.
// Request the alternative char codes for the key event.
// eKeyDown also needs alternative char codes because nsXBLWindowKeyHandler
// needs to check if a following keypress event is reserved by chrome for
// stopping propagation of its preceding keydown event.
keyEvent.mAlternativeCharCodes.Clear();
if ((WidgetKeyboardEvent::IsKeyDownOrKeyDownOnPlugin(aMessage) ||
aMessage == eKeyPress) &&
(keyEvent.IsControl() || keyEvent.IsAlt() ||
keyEvent.IsMeta() || keyEvent.IsOS())) {
nsCOMPtr<TextEventDispatcherListener> listener =
do_QueryReferent(mListener);
if (listener) {
DebugOnly<WidgetKeyboardEvent> original(keyEvent);
listener->WillDispatchKeyboardEvent(this, keyEvent, aIndexOfKeypress,
aData);
MOZ_ASSERT(keyEvent.mMessage ==
static_cast<WidgetKeyboardEvent&>(original).mMessage);
MOZ_ASSERT(keyEvent.mKeyCode ==
static_cast<WidgetKeyboardEvent&>(original).mKeyCode);
MOZ_ASSERT(keyEvent.mLocation ==
static_cast<WidgetKeyboardEvent&>(original).mLocation);
MOZ_ASSERT(keyEvent.mIsRepeat ==
static_cast<WidgetKeyboardEvent&>(original).mIsRepeat);
MOZ_ASSERT(keyEvent.mIsComposing ==
static_cast<WidgetKeyboardEvent&>(original).mIsComposing);
MOZ_ASSERT(keyEvent.mKeyNameIndex ==
static_cast<WidgetKeyboardEvent&>(original).mKeyNameIndex);
MOZ_ASSERT(keyEvent.mCodeNameIndex ==
static_cast<WidgetKeyboardEvent&>(original).mCodeNameIndex);
MOZ_ASSERT(keyEvent.mKeyValue ==
static_cast<WidgetKeyboardEvent&>(original).mKeyValue);
MOZ_ASSERT(keyEvent.mCodeValue ==
static_cast<WidgetKeyboardEvent&>(original).mCodeValue);
}
}
DispatchInputEvent(mWidget, keyEvent, aStatus);
return true;
}
bool
TextEventDispatcher::MaybeDispatchKeypressEvents(
const WidgetKeyboardEvent& aKeyboardEvent,
nsEventStatus& aStatus,
void* aData)
{
// If the key event was consumed, keypress event shouldn't be fired.
if (aStatus == nsEventStatus_eConsumeNoDefault) {
return false;
}
// If the key shouldn't cause keypress events, don't fire them.
if (!aKeyboardEvent.ShouldCauseKeypressEvents()) {
return false;
}
// If the key isn't a printable key or just inputting one character or
// no character, we should dispatch only one keypress. Otherwise, i.e.,
// if the key is a printable key and inputs multiple characters, keypress
// event should be dispatched the count of inputting characters times.
size_t keypressCount =
aKeyboardEvent.mKeyNameIndex != KEY_NAME_INDEX_USE_STRING ?
1 : std::max(static_cast<nsAString::size_type>(1),
aKeyboardEvent.mKeyValue.Length());
bool isDispatched = false;
bool consumed = false;
for (size_t i = 0; i < keypressCount; i++) {
aStatus = nsEventStatus_eIgnore;
if (!DispatchKeyboardEventInternal(eKeyPress, aKeyboardEvent,
aStatus, aData, i)) {
// The widget must have been gone.
break;
}
isDispatched = true;
if (!consumed) {
consumed = (aStatus == nsEventStatus_eConsumeNoDefault);
}
}
// If one of the keypress event was consumed, return ConsumeNoDefault.
if (consumed) {
aStatus = nsEventStatus_eConsumeNoDefault;
}
return isDispatched;
}
/******************************************************************************
* TextEventDispatcher::PendingComposition
*****************************************************************************/
TextEventDispatcher::PendingComposition::PendingComposition()
{
Clear();
}
void
TextEventDispatcher::PendingComposition::Clear()
{
mString.Truncate();
mClauses = nullptr;
mCaret.mRangeType = 0;
}
void
TextEventDispatcher::PendingComposition::EnsureClauseArray()
{
if (mClauses) {
return;
}
mClauses = new TextRangeArray();
}
nsresult
TextEventDispatcher::PendingComposition::SetString(const nsAString& aString)
{
mString = aString;
return NS_OK;
}
nsresult
TextEventDispatcher::PendingComposition::AppendClause(uint32_t aLength,
uint32_t aAttribute)
{
if (NS_WARN_IF(!aLength)) {
return NS_ERROR_INVALID_ARG;
}
switch (aAttribute) {
case NS_TEXTRANGE_RAWINPUT:
case NS_TEXTRANGE_SELECTEDRAWTEXT:
case NS_TEXTRANGE_CONVERTEDTEXT:
case NS_TEXTRANGE_SELECTEDCONVERTEDTEXT: {
EnsureClauseArray();
TextRange textRange;
textRange.mStartOffset =
mClauses->IsEmpty() ? 0 : mClauses->LastElement().mEndOffset;
textRange.mEndOffset = textRange.mStartOffset + aLength;
textRange.mRangeType = aAttribute;
mClauses->AppendElement(textRange);
return NS_OK;
}
default:
return NS_ERROR_INVALID_ARG;
}
}
nsresult
TextEventDispatcher::PendingComposition::SetCaret(uint32_t aOffset,
uint32_t aLength)
{
mCaret.mStartOffset = aOffset;
mCaret.mEndOffset = mCaret.mStartOffset + aLength;
mCaret.mRangeType = NS_TEXTRANGE_CARETPOSITION;
return NS_OK;
}
nsresult
TextEventDispatcher::PendingComposition::Set(const nsAString& aString,
const TextRangeArray* aRanges)
{
Clear();
nsAutoString str(aString);
// Don't expose CRLF to web contents, instead, use LF.
str.ReplaceSubstring(NS_LITERAL_STRING("\r\n"), NS_LITERAL_STRING("\n"));
nsresult rv = SetString(str);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (!aRanges || aRanges->IsEmpty()) {
// Create dummy range if aString isn't empty.
if (!aString.IsEmpty()) {
rv = AppendClause(str.Length(), NS_TEXTRANGE_RAWINPUT);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
}
return NS_OK;
}
// Adjust offsets in the ranges for XP linefeed character (only \n).
// XXX Following code is the safest approach. However, it wastes performance.
// For ensuring the clauses do not overlap each other, we should redesign
// TextRange later.
for (uint32_t i = 0; i < aRanges->Length(); ++i) {
TextRange range = aRanges->ElementAt(i);
TextRange nativeRange = range;
if (nativeRange.mStartOffset > 0) {
nsAutoString preText(Substring(aString, 0, nativeRange.mStartOffset));
preText.ReplaceSubstring(NS_LITERAL_STRING("\r\n"),
NS_LITERAL_STRING("\n"));
range.mStartOffset = preText.Length();
}
if (nativeRange.Length() == 0) {
range.mEndOffset = range.mStartOffset;
} else {
nsAutoString clause(
Substring(aString, nativeRange.mStartOffset, nativeRange.Length()));
clause.ReplaceSubstring(NS_LITERAL_STRING("\r\n"),
NS_LITERAL_STRING("\n"));
range.mEndOffset = range.mStartOffset + clause.Length();
}
if (range.mRangeType == NS_TEXTRANGE_CARETPOSITION) {
mCaret = range;
} else {
EnsureClauseArray();
mClauses->AppendElement(range);
}
}
return NS_OK;
}
nsresult
TextEventDispatcher::PendingComposition::Flush(
TextEventDispatcher* aDispatcher,
nsEventStatus& aStatus,
const WidgetEventTime* aEventTime)
{
aStatus = nsEventStatus_eIgnore;
nsresult rv = aDispatcher->GetState();
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (mClauses && !mClauses->IsEmpty() &&
mClauses->LastElement().mEndOffset != mString.Length()) {
NS_WARNING("Sum of length of the all clauses must be same as the string "
"length");
Clear();
return NS_ERROR_ILLEGAL_VALUE;
}
if (mCaret.mRangeType == NS_TEXTRANGE_CARETPOSITION) {
if (mCaret.mEndOffset > mString.Length()) {
NS_WARNING("Caret position is out of the composition string");
Clear();
return NS_ERROR_ILLEGAL_VALUE;
}
EnsureClauseArray();
mClauses->AppendElement(mCaret);
}
RefPtr<TextEventDispatcher> kungFuDeathGrip(aDispatcher);
nsCOMPtr<nsIWidget> widget(aDispatcher->mWidget);
WidgetCompositionEvent compChangeEvent(true, eCompositionChange, widget);
aDispatcher->InitEvent(compChangeEvent);
if (aEventTime) {
compChangeEvent.AssignEventTime(*aEventTime);
}
compChangeEvent.mData = mString;
if (mClauses) {
MOZ_ASSERT(!mClauses->IsEmpty(),
"mClauses must be non-empty array when it's not nullptr");
compChangeEvent.mRanges = mClauses;
}
// While this method dispatches a composition event, some other event handler
// cause more clauses to be added. So, we should clear pending composition
// before dispatching the event.
Clear();
rv = aDispatcher->StartCompositionAutomaticallyIfNecessary(aStatus,
aEventTime);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (aStatus == nsEventStatus_eConsumeNoDefault) {
return NS_OK;
}
rv = aDispatcher->DispatchEvent(widget, compChangeEvent, aStatus);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
return NS_OK;
}
} // namespace widget
} // namespace mozilla