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gecko-dev/dom/events/TextComposition.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "ContentEventHandler.h"
#include "IMEContentObserver.h"
#include "IMEStateManager.h"
#include "nsContentUtils.h"
#include "nsIContent.h"
#include "nsIMutationObserver.h"
#include "nsPresContext.h"
#include "mozilla/AutoRestore.h"
#include "mozilla/EditorBase.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/IntegerRange.h"
#include "mozilla/MiscEvents.h"
#include "mozilla/PresShell.h"
#include "mozilla/RangeBoundary.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/StaticPrefs_intl.h"
#include "mozilla/TextComposition.h"
#include "mozilla/TextEvents.h"
#include "mozilla/Unused.h"
#include "mozilla/dom/BrowserParent.h"
#ifdef XP_MACOSX
// Some defiens will be conflict with OSX SDK
# define TextRange _TextRange
# define TextRangeArray _TextRangeArray
# define Comment _Comment
#endif
#ifdef XP_MACOSX
# undef TextRange
# undef TextRangeArray
# undef Comment
#endif
using namespace mozilla::widget;
namespace mozilla {
#define IDEOGRAPHIC_SPACE (u"\x3000"_ns)
/******************************************************************************
* TextComposition
******************************************************************************/
bool TextComposition::sHandlingSelectionEvent = false;
TextComposition::TextComposition(nsPresContext* aPresContext, nsINode* aNode,
BrowserParent* aBrowserParent,
WidgetCompositionEvent* aCompositionEvent)
: mPresContext(aPresContext),
mNode(aNode),
mBrowserParent(aBrowserParent),
mNativeContext(aCompositionEvent->mNativeIMEContext),
mCompositionStartOffset(0),
mTargetClauseOffsetInComposition(0),
mCompositionStartOffsetInTextNode(UINT32_MAX),
mCompositionLengthInTextNode(UINT32_MAX),
mIsSynthesizedForTests(aCompositionEvent->mFlags.mIsSynthesizedForTests),
mIsComposing(false),
mIsEditorHandlingEvent(false),
mIsRequestingCommit(false),
mIsRequestingCancel(false),
mRequestedToCommitOrCancel(false),
mHasDispatchedDOMTextEvent(false),
mHasReceivedCommitEvent(false),
mWasNativeCompositionEndEventDiscarded(false),
mAllowControlCharacters(
StaticPrefs::dom_compositionevent_allow_control_characters()),
mWasCompositionStringEmpty(true) {
MOZ_ASSERT(aCompositionEvent->mNativeIMEContext.IsValid());
}
void TextComposition::Destroy() {
mPresContext = nullptr;
mNode = nullptr;
mBrowserParent = nullptr;
mContainerTextNode = nullptr;
mCompositionStartOffsetInTextNode = UINT32_MAX;
mCompositionLengthInTextNode = UINT32_MAX;
// TODO: If the editor is still alive and this is held by it, we should tell
// this being destroyed for cleaning up the stuff.
}
void TextComposition::OnCharacterDataChanged(
Text& aText, const CharacterDataChangeInfo& aInfo) {
if (mContainerTextNode != &aText ||
mCompositionStartOffsetInTextNode == UINT32_MAX ||
mCompositionLengthInTextNode == UINT32_MAX) {
return;
}
// Ignore changes after composition string.
if (aInfo.mChangeStart >=
mCompositionStartOffsetInTextNode + mCompositionLengthInTextNode) {
return;
}
// If the change ends before the composition string, we need only to adjust
// the start offset.
if (aInfo.mChangeEnd <= mCompositionStartOffsetInTextNode) {
MOZ_ASSERT(aInfo.LengthOfRemovedText() <=
mCompositionStartOffsetInTextNode);
mCompositionStartOffsetInTextNode -= aInfo.LengthOfRemovedText();
mCompositionStartOffsetInTextNode += aInfo.mReplaceLength;
return;
}
// If this is caused by a splitting text node, the composition string
// may be split out to the new right node. In the case,
// CompositionTransaction::DoTransaction handles it with warking the
// following text nodes. Therefore, we should NOT shrink the composing
// range for avoind breaking the fix of bug 1310912. Although the handling
// looks buggy so that we need to move the handling into here later.
if (aInfo.mDetails &&
aInfo.mDetails->mType == CharacterDataChangeInfo::Details::eSplit) {
return;
}
// If the change removes/replaces the last character of the composition
// string, we should shrink the composition range before the change start.
// Then, the replace string will be never updated by coming composition
// updates.
if (aInfo.mChangeEnd >=
mCompositionStartOffsetInTextNode + mCompositionLengthInTextNode) {
// If deleting the first character of the composition string, collapse IME
// selection temporarily. Updating composition string will insert new
// composition string there.
if (aInfo.mChangeStart <= mCompositionStartOffsetInTextNode) {
mCompositionStartOffsetInTextNode = aInfo.mChangeStart;
mCompositionLengthInTextNode = 0u;
return;
}
// If some characters in the composition still stay, composition range
// should be shrunken.
MOZ_ASSERT(aInfo.mChangeStart > mCompositionStartOffsetInTextNode);
mCompositionLengthInTextNode =
aInfo.mChangeStart - mCompositionStartOffsetInTextNode;
return;
}
// If removed range starts in the composition string, we need only adjust
// the length to make composition range contain the replace string.
if (aInfo.mChangeStart >= mCompositionStartOffsetInTextNode) {
MOZ_ASSERT(aInfo.LengthOfRemovedText() <= mCompositionLengthInTextNode);
mCompositionLengthInTextNode -= aInfo.LengthOfRemovedText();
mCompositionLengthInTextNode += aInfo.mReplaceLength;
return;
}
// If preceding characers of the composition string is also removed, new
// composition start will be there and new composition ends at current
// position.
const uint32_t removedLengthInCompositionString =
aInfo.mChangeEnd - mCompositionStartOffsetInTextNode;
mCompositionStartOffsetInTextNode = aInfo.mChangeStart;
mCompositionLengthInTextNode -= removedLengthInCompositionString;
mCompositionLengthInTextNode += aInfo.mReplaceLength;
}
bool TextComposition::IsValidStateForComposition(nsIWidget* aWidget) const {
return !Destroyed() && aWidget && !aWidget->Destroyed() &&
mPresContext->GetPresShell() &&
!mPresContext->PresShell()->IsDestroying();
}
bool TextComposition::MaybeDispatchCompositionUpdate(
const WidgetCompositionEvent* aCompositionEvent) {
MOZ_RELEASE_ASSERT(!mBrowserParent);
if (!IsValidStateForComposition(aCompositionEvent->mWidget)) {
return false;
}
// Note that we don't need to dispatch eCompositionUpdate event even if
// mHasDispatchedDOMTextEvent is false and eCompositionCommit event is
// dispatched with empty string immediately after eCompositionStart
// because composition string has never been changed from empty string to
// non-empty string in such composition even if selected string was not
// empty string (mLastData isn't set to selected text when this receives
// eCompositionStart).
if (mLastData == aCompositionEvent->mData) {
return true;
}
CloneAndDispatchAs(aCompositionEvent, eCompositionUpdate);
return IsValidStateForComposition(aCompositionEvent->mWidget);
}
BaseEventFlags TextComposition::CloneAndDispatchAs(
const WidgetCompositionEvent* aCompositionEvent, EventMessage aMessage,
nsEventStatus* aStatus, EventDispatchingCallback* aCallBack) {
MOZ_RELEASE_ASSERT(!mBrowserParent);
MOZ_ASSERT(IsValidStateForComposition(aCompositionEvent->mWidget),
"Should be called only when it's safe to dispatch an event");
WidgetCompositionEvent compositionEvent(aCompositionEvent->IsTrusted(),
aMessage, aCompositionEvent->mWidget);
compositionEvent.mTime = aCompositionEvent->mTime;
compositionEvent.mTimeStamp = aCompositionEvent->mTimeStamp;
compositionEvent.mData = aCompositionEvent->mData;
compositionEvent.mNativeIMEContext = aCompositionEvent->mNativeIMEContext;
compositionEvent.mOriginalMessage = aCompositionEvent->mMessage;
compositionEvent.mFlags.mIsSynthesizedForTests =
aCompositionEvent->mFlags.mIsSynthesizedForTests;
nsEventStatus dummyStatus = nsEventStatus_eConsumeNoDefault;
nsEventStatus* status = aStatus ? aStatus : &dummyStatus;
if (aMessage == eCompositionUpdate) {
mLastData = compositionEvent.mData;
mLastRanges = aCompositionEvent->mRanges;
}
DispatchEvent(&compositionEvent, status, aCallBack, aCompositionEvent);
return compositionEvent.mFlags;
}
void TextComposition::DispatchEvent(
WidgetCompositionEvent* aDispatchEvent, nsEventStatus* aStatus,
EventDispatchingCallback* aCallBack,
const WidgetCompositionEvent* aOriginalEvent) {
if (aDispatchEvent->mMessage == eCompositionChange) {
aDispatchEvent->mFlags.mOnlySystemGroupDispatchInContent = true;
}
RefPtr<nsINode> node = mNode;
RefPtr<nsPresContext> presContext = mPresContext;
EventDispatcher::Dispatch(node, presContext, aDispatchEvent, nullptr, aStatus,
aCallBack);
OnCompositionEventDispatched(aDispatchEvent);
}
void TextComposition::OnCompositionEventDiscarded(
WidgetCompositionEvent* aCompositionEvent) {
// Note that this method is never called for synthesized events for emulating
// commit or cancel composition.
MOZ_ASSERT(aCompositionEvent->IsTrusted(),
"Shouldn't be called with untrusted event");
if (mBrowserParent) {
// The composition event should be discarded in the child process too.
Unused << mBrowserParent->SendCompositionEvent(*aCompositionEvent);
}
// XXX If composition events are discarded, should we dispatch them with
// runnable event? However, even if we do so, it might make native IME
// confused due to async modification. Especially when native IME is
// TSF.
if (!aCompositionEvent->CausesDOMCompositionEndEvent()) {
return;
}
mWasNativeCompositionEndEventDiscarded = true;
}
static inline bool IsControlChar(uint32_t aCharCode) {
return aCharCode < ' ' || aCharCode == 0x7F;
}
static size_t FindFirstControlCharacter(const nsAString& aStr) {
const char16_t* sourceBegin = aStr.BeginReading();
const char16_t* sourceEnd = aStr.EndReading();
for (const char16_t* source = sourceBegin; source < sourceEnd; ++source) {
if (*source != '\t' && IsControlChar(*source)) {
return source - sourceBegin;
}
}
return -1;
}
static void RemoveControlCharactersFrom(nsAString& aStr,
TextRangeArray* aRanges) {
size_t firstControlCharOffset = FindFirstControlCharacter(aStr);
if (firstControlCharOffset == (size_t)-1) {
return;
}
nsAutoString copy(aStr);
const char16_t* sourceBegin = copy.BeginReading();
const char16_t* sourceEnd = copy.EndReading();
char16_t* dest = aStr.BeginWriting();
if (NS_WARN_IF(!dest)) {
return;
}
char16_t* curDest = dest + firstControlCharOffset;
size_t i = firstControlCharOffset;
for (const char16_t* source = sourceBegin + firstControlCharOffset;
source < sourceEnd; ++source) {
if (*source == '\t' || *source == '\n' || !IsControlChar(*source)) {
*curDest = *source;
++curDest;
++i;
} else if (aRanges) {
aRanges->RemoveCharacter(i);
}
}
aStr.SetLength(curDest - dest);
}
nsString TextComposition::CommitStringIfCommittedAsIs() const {
nsString result(mLastData);
if (!mAllowControlCharacters) {
RemoveControlCharactersFrom(result, nullptr);
}
if (StaticPrefs::intl_ime_remove_placeholder_character_at_commit() &&
mLastData == IDEOGRAPHIC_SPACE) {
return EmptyString();
}
return result;
}
void TextComposition::DispatchCompositionEvent(
WidgetCompositionEvent* aCompositionEvent, nsEventStatus* aStatus,
EventDispatchingCallback* aCallBack, bool aIsSynthesized) {
mWasCompositionStringEmpty = mString.IsEmpty();
if (aCompositionEvent->IsFollowedByCompositionEnd()) {
mHasReceivedCommitEvent = true;
}
// If this instance has requested to commit or cancel composition but
// is not synthesizing commit event, that means that the IME commits or
// cancels the composition asynchronously. Typically, iBus behaves so.
// Then, synthesized events which were dispatched immediately after
// the request has already committed our editor's composition string and
// told it to web apps. Therefore, we should ignore the delayed events.
if (mRequestedToCommitOrCancel && !aIsSynthesized) {
*aStatus = nsEventStatus_eConsumeNoDefault;
return;
}
// If the content is a container of BrowserParent, composition should be in
// the remote process.
if (mBrowserParent) {
Unused << mBrowserParent->SendCompositionEvent(*aCompositionEvent);
aCompositionEvent->StopPropagation();
if (aCompositionEvent->CausesDOMTextEvent()) {
mLastData = aCompositionEvent->mData;
mLastRanges = aCompositionEvent->mRanges;
// Although, the composition event hasn't been actually handled yet,
// emulate an editor to be handling the composition event.
EditorWillHandleCompositionChangeEvent(aCompositionEvent);
EditorDidHandleCompositionChangeEvent();
}
return;
}
if (!mAllowControlCharacters) {
RemoveControlCharactersFrom(aCompositionEvent->mData,
aCompositionEvent->mRanges);
}
if (aCompositionEvent->mMessage == eCompositionCommitAsIs) {
NS_ASSERTION(!aCompositionEvent->mRanges,
"mRanges of eCompositionCommitAsIs should be null");
aCompositionEvent->mRanges = nullptr;
NS_ASSERTION(aCompositionEvent->mData.IsEmpty(),
"mData of eCompositionCommitAsIs should be empty string");
if (StaticPrefs::intl_ime_remove_placeholder_character_at_commit() &&
mLastData == IDEOGRAPHIC_SPACE) {
// If the last data is an ideographic space (FullWidth space), it might be
// a placeholder character of some Chinese IME. So, committing with
// this data might not be expected by users. Let's use empty string.
aCompositionEvent->mData.Truncate();
} else {
aCompositionEvent->mData = mLastData;
}
} else if (aCompositionEvent->mMessage == eCompositionCommit) {
NS_ASSERTION(!aCompositionEvent->mRanges,
"mRanges of eCompositionCommit should be null");
aCompositionEvent->mRanges = nullptr;
}
if (!IsValidStateForComposition(aCompositionEvent->mWidget)) {
*aStatus = nsEventStatus_eConsumeNoDefault;
return;
}
// IME may commit composition with empty string for a commit request or
// with non-empty string for a cancel request. We should prevent such
// unexpected result. E.g., web apps may be confused if they implement
// autocomplete which attempts to commit composition forcibly when the user
// selects one of suggestions but composition string is cleared by IME.
// Note that most Chinese IMEs don't expose actual composition string to us.
// They typically tell us an IDEOGRAPHIC SPACE or empty string as composition
// string. Therefore, we should hack it only when:
// 1. committing string is empty string at requesting commit but the last
// data isn't IDEOGRAPHIC SPACE.
// 2. non-empty string is committed at requesting cancel.
if (!aIsSynthesized && (mIsRequestingCommit || mIsRequestingCancel)) {
nsString* committingData = nullptr;
switch (aCompositionEvent->mMessage) {
case eCompositionEnd:
case eCompositionChange:
case eCompositionCommitAsIs:
case eCompositionCommit:
committingData = &aCompositionEvent->mData;
break;
default:
NS_WARNING(
"Unexpected event comes during committing or "
"canceling composition");
break;
}
if (committingData) {
if (mIsRequestingCommit && committingData->IsEmpty() &&
mLastData != IDEOGRAPHIC_SPACE) {
committingData->Assign(mLastData);
} else if (mIsRequestingCancel && !committingData->IsEmpty()) {
committingData->Truncate();
}
}
}
bool dispatchEvent = true;
bool dispatchDOMTextEvent = aCompositionEvent->CausesDOMTextEvent();
// When mIsComposing is false but the committing string is different from
// the last data (E.g., previous eCompositionChange event made the
// composition string empty or didn't have clause information), we don't
// need to dispatch redundant DOM text event. (But note that we need to
// dispatch eCompositionChange event if we have not dispatched
// eCompositionChange event yet and commit string replaces selected string
// with empty string since selected string hasn't been replaced with empty
// string yet.)
if (dispatchDOMTextEvent &&
aCompositionEvent->mMessage != eCompositionChange && !mIsComposing &&
mHasDispatchedDOMTextEvent && mLastData == aCompositionEvent->mData) {
dispatchEvent = dispatchDOMTextEvent = false;
}
// widget may dispatch redundant eCompositionChange event
// which modifies neither composition string, clauses nor caret
// position. In such case, we shouldn't dispatch DOM events.
if (dispatchDOMTextEvent &&
aCompositionEvent->mMessage == eCompositionChange &&
mLastData == aCompositionEvent->mData && mRanges &&
aCompositionEvent->mRanges &&
mRanges->Equals(*aCompositionEvent->mRanges)) {
dispatchEvent = dispatchDOMTextEvent = false;
}
if (dispatchDOMTextEvent) {
if (!MaybeDispatchCompositionUpdate(aCompositionEvent)) {
return;
}
}
if (dispatchEvent) {
// If the composition event should cause a DOM text event, we should
// overwrite the event message as eCompositionChange because due to
// the limitation of mapping between event messages and DOM event types,
// we cannot map multiple event messages to a DOM event type.
if (dispatchDOMTextEvent &&
aCompositionEvent->mMessage != eCompositionChange) {
mHasDispatchedDOMTextEvent = true;
aCompositionEvent->mFlags = CloneAndDispatchAs(
aCompositionEvent, eCompositionChange, aStatus, aCallBack);
} else {
if (aCompositionEvent->mMessage == eCompositionChange) {
mHasDispatchedDOMTextEvent = true;
}
DispatchEvent(aCompositionEvent, aStatus, aCallBack);
}
} else {
*aStatus = nsEventStatus_eConsumeNoDefault;
}
if (!IsValidStateForComposition(aCompositionEvent->mWidget)) {
return;
}
// Emulate editor behavior of compositionchange event (DOM text event) handler
// if no editor handles composition events.
if (dispatchDOMTextEvent && !HasEditor()) {
EditorWillHandleCompositionChangeEvent(aCompositionEvent);
EditorDidHandleCompositionChangeEvent();
}
if (aCompositionEvent->CausesDOMCompositionEndEvent()) {
// Dispatch a compositionend event if it's necessary.
if (aCompositionEvent->mMessage != eCompositionEnd) {
CloneAndDispatchAs(aCompositionEvent, eCompositionEnd);
}
MOZ_ASSERT(!mIsComposing, "Why is the editor still composing?");
MOZ_ASSERT(!HasEditor(), "Why does the editor still keep to hold this?");
}
MaybeNotifyIMEOfCompositionEventHandled(aCompositionEvent);
}
// static
void TextComposition::HandleSelectionEvent(
nsPresContext* aPresContext, BrowserParent* aBrowserParent,
WidgetSelectionEvent* aSelectionEvent) {
// If the content is a container of BrowserParent, composition should be in
// the remote process.
if (aBrowserParent) {
Unused << aBrowserParent->SendSelectionEvent(*aSelectionEvent);
aSelectionEvent->StopPropagation();
return;
}
ContentEventHandler handler(aPresContext);
AutoRestore<bool> saveHandlingSelectionEvent(sHandlingSelectionEvent);
sHandlingSelectionEvent = true;
// XXX During setting selection, a selection listener may change selection
// again. In such case, sHandlingSelectionEvent doesn't indicate if
// the selection change is caused by a selection event. However, it
// must be non-realistic scenario.
handler.OnSelectionEvent(aSelectionEvent);
}
uint32_t TextComposition::GetSelectionStartOffset() {
nsCOMPtr<nsIWidget> widget = mPresContext->GetRootWidget();
WidgetQueryContentEvent querySelectedTextEvent(true, eQuerySelectedText,
widget);
// Due to a bug of widget, mRanges may not be nullptr even though composition
// string is empty. So, we need to check it here for avoiding to return
// odd start offset.
if (!mLastData.IsEmpty() && mRanges && mRanges->HasClauses()) {
querySelectedTextEvent.InitForQuerySelectedText(
ToSelectionType(mRanges->GetFirstClause()->mRangeType));
} else {
NS_WARNING_ASSERTION(
!mLastData.IsEmpty() || !mRanges || !mRanges->HasClauses(),
"Shouldn't have empty clause info when composition string is empty");
querySelectedTextEvent.InitForQuerySelectedText(SelectionType::eNormal);
}
// The editor which has this composition is observed by active
// IMEContentObserver, we can use the cache of it.
RefPtr<IMEContentObserver> contentObserver =
IMEStateManager::GetActiveContentObserver();
bool doQuerySelection = true;
if (contentObserver) {
if (contentObserver->IsManaging(*this)) {
doQuerySelection = false;
contentObserver->HandleQueryContentEvent(&querySelectedTextEvent);
}
// If another editor already has focus, we cannot retrieve selection
// in the editor which has this composition...
else if (NS_WARN_IF(contentObserver->GetPresContext() == mPresContext)) {
return 0; // XXX Is this okay?
}
}
// Otherwise, using slow path (i.e., compute every time with
// ContentEventHandler)
if (doQuerySelection) {
ContentEventHandler handler(mPresContext);
handler.HandleQueryContentEvent(&querySelectedTextEvent);
}
if (NS_WARN_IF(querySelectedTextEvent.DidNotFindSelection())) {
return 0; // XXX Is this okay?
}
return querySelectedTextEvent.mReply->AnchorOffset();
}
void TextComposition::OnCompositionEventDispatched(
const WidgetCompositionEvent* aCompositionEvent) {
MOZ_RELEASE_ASSERT(!mBrowserParent);
if (!IsValidStateForComposition(aCompositionEvent->mWidget)) {
return;
}
// Every composition event may cause changing composition start offset,
// especially when there is no composition string. Therefore, we need to
// update mCompositionStartOffset with the latest offset.
MOZ_ASSERT(aCompositionEvent->mMessage != eCompositionStart ||
mWasCompositionStringEmpty,
"mWasCompositionStringEmpty should be true if the dispatched "
"event is eCompositionStart");
if (mWasCompositionStringEmpty &&
!aCompositionEvent->CausesDOMCompositionEndEvent()) {
// If there was no composition string, current selection start may be the
// offset for inserting composition string.
// Update composition start offset with current selection start.
mCompositionStartOffset = GetSelectionStartOffset();
mTargetClauseOffsetInComposition = 0;
}
if (aCompositionEvent->CausesDOMTextEvent()) {
mTargetClauseOffsetInComposition = aCompositionEvent->TargetClauseOffset();
}
}
void TextComposition::OnStartOffsetUpdatedInChild(uint32_t aStartOffset) {
mCompositionStartOffset = aStartOffset;
}
void TextComposition::MaybeNotifyIMEOfCompositionEventHandled(
const WidgetCompositionEvent* aCompositionEvent) {
if (aCompositionEvent->mMessage != eCompositionStart &&
!aCompositionEvent->CausesDOMTextEvent()) {
return;
}
RefPtr<IMEContentObserver> contentObserver =
IMEStateManager::GetActiveContentObserver();
// When IMEContentObserver is managing the editor which has this composition,
// composition event handled notification should be sent after the observer
// notifies all pending notifications. Therefore, we should use it.
// XXX If IMEContentObserver suddenly loses focus after here and notifying
// widget of pending notifications, we won't notify widget of composition
// event handled. Although, this is a bug but it should be okay since
// destroying IMEContentObserver notifies IME of blur. So, native IME
// handler can treat it as this notification too.
if (contentObserver && contentObserver->IsManaging(*this)) {
contentObserver->MaybeNotifyCompositionEventHandled();
return;
}
// Otherwise, e.g., this composition is in non-active window, we should
// notify widget directly.
NotifyIME(NOTIFY_IME_OF_COMPOSITION_EVENT_HANDLED);
}
void TextComposition::DispatchCompositionEventRunnable(
EventMessage aEventMessage, const nsAString& aData,
bool aIsSynthesizingCommit) {
nsContentUtils::AddScriptRunner(new CompositionEventDispatcher(
this, mNode, aEventMessage, aData, aIsSynthesizingCommit));
}
nsresult TextComposition::RequestToCommit(nsIWidget* aWidget, bool aDiscard) {
// If this composition is already requested to be committed or canceled,
// or has already finished in IME, we don't need to request it again because
// request from this instance shouldn't cause committing nor canceling current
// composition in IME, and even if the first request failed, new request
// won't success, probably. And we shouldn't synthesize events for
// committing or canceling composition twice or more times.
if (!CanRequsetIMEToCommitOrCancelComposition()) {
return NS_OK;
}
RefPtr<TextComposition> kungFuDeathGrip(this);
const nsAutoString lastData(mLastData);
if (IMEStateManager::CanSendNotificationToWidget()) {
AutoRestore<bool> saveRequestingCancel(mIsRequestingCancel);
AutoRestore<bool> saveRequestingCommit(mIsRequestingCommit);
if (aDiscard) {
mIsRequestingCancel = true;
mIsRequestingCommit = false;
} else {
mIsRequestingCancel = false;
mIsRequestingCommit = true;
}
// FYI: CompositionEvents caused by a call of NotifyIME() may be
// discarded by PresShell if it's not safe to dispatch the event.
nsresult rv = aWidget->NotifyIME(
IMENotification(aDiscard ? REQUEST_TO_CANCEL_COMPOSITION
: REQUEST_TO_COMMIT_COMPOSITION));
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
}
mRequestedToCommitOrCancel = true;
// If the request is performed synchronously, this must be already destroyed.
if (Destroyed()) {
return NS_OK;
}
// Otherwise, synthesize the commit in content.
nsAutoString data(aDiscard ? EmptyString() : lastData);
if (data == mLastData) {
DispatchCompositionEventRunnable(eCompositionCommitAsIs, u""_ns, true);
} else {
DispatchCompositionEventRunnable(eCompositionCommit, data, true);
}
return NS_OK;
}
nsresult TextComposition::NotifyIME(IMEMessage aMessage) {
NS_ENSURE_TRUE(mPresContext, NS_ERROR_NOT_AVAILABLE);
return IMEStateManager::NotifyIME(aMessage, mPresContext, mBrowserParent);
}
void TextComposition::EditorWillHandleCompositionChangeEvent(
const WidgetCompositionEvent* aCompositionChangeEvent) {
mIsComposing = aCompositionChangeEvent->IsComposing();
mRanges = aCompositionChangeEvent->mRanges;
mIsEditorHandlingEvent = true;
MOZ_ASSERT(
mLastData == aCompositionChangeEvent->mData,
"The text of a compositionchange event must be same as previous data "
"attribute value of the latest compositionupdate event");
}
void TextComposition::OnEditorDestroyed() {
MOZ_RELEASE_ASSERT(!mBrowserParent);
MOZ_ASSERT(!mIsEditorHandlingEvent,
"The editor should have stopped listening events");
nsCOMPtr<nsIWidget> widget = GetWidget();
if (NS_WARN_IF(!widget)) {
// XXX If this could happen, how do we notify IME of destroying the editor?
return;
}
// Try to cancel the composition.
RequestToCommit(widget, true);
}
void TextComposition::EditorDidHandleCompositionChangeEvent() {
mString = mLastData;
mIsEditorHandlingEvent = false;
}
void TextComposition::StartHandlingComposition(EditorBase* aEditorBase) {
MOZ_RELEASE_ASSERT(!mBrowserParent);
MOZ_ASSERT(!HasEditor(), "There is a handling editor already");
mEditorBaseWeak = do_GetWeakReference(static_cast<nsIEditor*>(aEditorBase));
}
void TextComposition::EndHandlingComposition(EditorBase* aEditorBase) {
MOZ_RELEASE_ASSERT(!mBrowserParent);
#ifdef DEBUG
RefPtr<EditorBase> editorBase = GetEditorBase();
MOZ_ASSERT(!editorBase || editorBase == aEditorBase,
"Another editor handled the composition?");
#endif // #ifdef DEBUG
mEditorBaseWeak = nullptr;
}
already_AddRefed<EditorBase> TextComposition::GetEditorBase() const {
nsCOMPtr<nsIEditor> editor = do_QueryReferent(mEditorBaseWeak);
RefPtr<EditorBase> editorBase = static_cast<EditorBase*>(editor.get());
return editorBase.forget();
}
bool TextComposition::HasEditor() const {
return mEditorBaseWeak && mEditorBaseWeak->IsAlive();
}
RawRangeBoundary TextComposition::FirstIMESelectionStartRef() const {
RefPtr<EditorBase> editorBase = GetEditorBase();
if (!editorBase) {
return RawRangeBoundary();
}
nsISelectionController* selectionController =
editorBase->GetSelectionController();
if (NS_WARN_IF(!selectionController)) {
return RawRangeBoundary();
}
const nsRange* firstRange = nullptr;
static const SelectionType kIMESelectionTypes[] = {
SelectionType::eIMERawClause, SelectionType::eIMESelectedRawClause,
SelectionType::eIMEConvertedClause, SelectionType::eIMESelectedClause};
for (auto selectionType : kIMESelectionTypes) {
dom::Selection* selection =
selectionController->GetSelection(ToRawSelectionType(selectionType));
if (!selection) {
continue;
}
const uint32_t rangeCount = selection->RangeCount();
for (const uint32_t i : IntegerRange(rangeCount)) {
MOZ_ASSERT(selection->RangeCount() == rangeCount);
const nsRange* range = selection->GetRangeAt(i);
MOZ_ASSERT(range);
if (MOZ_UNLIKELY(NS_WARN_IF(!range)) ||
MOZ_UNLIKELY(NS_WARN_IF(!range->GetStartContainer()))) {
continue;
}
if (!firstRange) {
firstRange = range;
continue;
}
// In most cases, all composition string should be in same text node.
if (firstRange->GetStartContainer() == range->GetStartContainer()) {
if (firstRange->StartOffset() > range->StartOffset()) {
firstRange = range;
}
continue;
}
// However, if web apps have inserted different nodes in composition
// string, composition string may span 2 or more nodes.
if (firstRange->GetStartContainer()->GetNextSibling() ==
range->GetStartContainer()) {
// Fast path for some known applications like Google Keep.
firstRange = range;
continue;
}
// Unfortunately, really slow path.
// The ranges should always have a common ancestor, hence, be comparable.
if (*nsContentUtils::ComparePoints(range->StartRef(),
firstRange->StartRef()) == -1) {
firstRange = range;
}
}
}
return firstRange ? firstRange->StartRef().AsRaw() : RawRangeBoundary();
}
RawRangeBoundary TextComposition::LastIMESelectionEndRef() const {
RefPtr<EditorBase> editorBase = GetEditorBase();
if (!editorBase) {
return RawRangeBoundary();
}
nsISelectionController* selectionController =
editorBase->GetSelectionController();
if (NS_WARN_IF(!selectionController)) {
return RawRangeBoundary();
}
const nsRange* lastRange = nullptr;
static const SelectionType kIMESelectionTypes[] = {
SelectionType::eIMERawClause, SelectionType::eIMESelectedRawClause,
SelectionType::eIMEConvertedClause, SelectionType::eIMESelectedClause};
for (auto selectionType : kIMESelectionTypes) {
dom::Selection* selection =
selectionController->GetSelection(ToRawSelectionType(selectionType));
if (!selection) {
continue;
}
const uint32_t rangeCount = selection->RangeCount();
for (const uint32_t i : IntegerRange(rangeCount)) {
MOZ_ASSERT(selection->RangeCount() == rangeCount);
const nsRange* range = selection->GetRangeAt(i);
MOZ_ASSERT(range);
if (MOZ_UNLIKELY(NS_WARN_IF(!range)) ||
MOZ_UNLIKELY(NS_WARN_IF(!range->GetEndContainer()))) {
continue;
}
if (!lastRange) {
lastRange = range;
continue;
}
// In most cases, all composition string should be in same text node.
if (lastRange->GetEndContainer() == range->GetEndContainer()) {
if (lastRange->EndOffset() < range->EndOffset()) {
lastRange = range;
}
continue;
}
// However, if web apps have inserted different nodes in composition
// string, composition string may span 2 or more nodes.
if (lastRange->GetEndContainer() ==
range->GetEndContainer()->GetNextSibling()) {
// Fast path for some known applications like Google Keep.
lastRange = range;
continue;
}
// Unfortunately, really slow path.
// The ranges should always have a common ancestor, hence, be comparable.
if (*nsContentUtils::ComparePoints(lastRange->EndRef(),
range->EndRef()) == -1) {
lastRange = range;
}
}
}
return lastRange ? lastRange->EndRef().AsRaw() : RawRangeBoundary();
}
/******************************************************************************
* TextComposition::CompositionEventDispatcher
******************************************************************************/
TextComposition::CompositionEventDispatcher::CompositionEventDispatcher(
TextComposition* aComposition, nsINode* aEventTarget,
EventMessage aEventMessage, const nsAString& aData,
bool aIsSynthesizedEvent)
: Runnable("TextComposition::CompositionEventDispatcher"),
mTextComposition(aComposition),
mEventTarget(aEventTarget),
mData(aData),
mEventMessage(aEventMessage),
mIsSynthesizedEvent(aIsSynthesizedEvent) {}
NS_IMETHODIMP
TextComposition::CompositionEventDispatcher::Run() {
// The widget can be different from the widget which has dispatched
// composition events because GetWidget() returns a widget which is proper
// for calling NotifyIME(). However, this must no be problem since both
// widget should share native IME context. Therefore, even if an event
// handler uses the widget for requesting IME to commit or cancel, it works.
nsCOMPtr<nsIWidget> widget(mTextComposition->GetWidget());
if (!mTextComposition->IsValidStateForComposition(widget)) {
return NS_OK; // cannot dispatch any events anymore
}
RefPtr<nsPresContext> presContext = mTextComposition->mPresContext;
nsCOMPtr<nsINode> eventTarget = mEventTarget;
RefPtr<BrowserParent> browserParent = mTextComposition->mBrowserParent;
nsEventStatus status = nsEventStatus_eIgnore;
switch (mEventMessage) {
case eCompositionStart: {
WidgetCompositionEvent compStart(true, eCompositionStart, widget);
compStart.mNativeIMEContext = mTextComposition->mNativeContext;
WidgetQueryContentEvent querySelectedTextEvent(true, eQuerySelectedText,
widget);
ContentEventHandler handler(presContext);
handler.OnQuerySelectedText(&querySelectedTextEvent);
NS_ASSERTION(querySelectedTextEvent.Succeeded(),
"Failed to get selected text");
if (querySelectedTextEvent.FoundSelection()) {
compStart.mData = querySelectedTextEvent.mReply->DataRef();
}
compStart.mFlags.mIsSynthesizedForTests =
mTextComposition->IsSynthesizedForTests();
IMEStateManager::DispatchCompositionEvent(
eventTarget, presContext, browserParent, &compStart, &status, nullptr,
mIsSynthesizedEvent);
break;
}
case eCompositionChange:
case eCompositionCommitAsIs:
case eCompositionCommit: {
WidgetCompositionEvent compEvent(true, mEventMessage, widget);
compEvent.mNativeIMEContext = mTextComposition->mNativeContext;
if (mEventMessage != eCompositionCommitAsIs) {
compEvent.mData = mData;
}
compEvent.mFlags.mIsSynthesizedForTests =
mTextComposition->IsSynthesizedForTests();
IMEStateManager::DispatchCompositionEvent(
eventTarget, presContext, browserParent, &compEvent, &status, nullptr,
mIsSynthesizedEvent);
break;
}
default:
MOZ_CRASH("Unsupported event");
}
return NS_OK;
}
/******************************************************************************
* TextCompositionArray
******************************************************************************/
TextCompositionArray::index_type TextCompositionArray::IndexOf(
const NativeIMEContext& aNativeIMEContext) {
if (!aNativeIMEContext.IsValid()) {
return NoIndex;
}
for (index_type i = Length(); i > 0; --i) {
if (ElementAt(i - 1)->GetNativeIMEContext() == aNativeIMEContext) {
return i - 1;
}
}
return NoIndex;
}
TextCompositionArray::index_type TextCompositionArray::IndexOf(
nsIWidget* aWidget) {
return IndexOf(aWidget->GetNativeIMEContext());
}
TextCompositionArray::index_type TextCompositionArray::IndexOf(
nsPresContext* aPresContext) {
for (index_type i = Length(); i > 0; --i) {
if (ElementAt(i - 1)->GetPresContext() == aPresContext) {
return i - 1;
}
}
return NoIndex;
}
TextCompositionArray::index_type TextCompositionArray::IndexOf(
nsPresContext* aPresContext, nsINode* aNode) {
index_type index = IndexOf(aPresContext);
if (index == NoIndex) {
return NoIndex;
}
nsINode* node = ElementAt(index)->GetEventTargetNode();
return node == aNode ? index : NoIndex;
}
TextComposition* TextCompositionArray::GetCompositionFor(nsIWidget* aWidget) {
index_type i = IndexOf(aWidget);
if (i == NoIndex) {
return nullptr;
}
return ElementAt(i);
}
TextComposition* TextCompositionArray::GetCompositionFor(
const WidgetCompositionEvent* aCompositionEvent) {
index_type i = IndexOf(aCompositionEvent->mNativeIMEContext);
if (i == NoIndex) {
return nullptr;
}
return ElementAt(i);
}
TextComposition* TextCompositionArray::GetCompositionFor(
nsPresContext* aPresContext) {
index_type i = IndexOf(aPresContext);
if (i == NoIndex) {
return nullptr;
}
return ElementAt(i);
}
TextComposition* TextCompositionArray::GetCompositionFor(
nsPresContext* aPresContext, nsINode* aNode) {
index_type i = IndexOf(aPresContext, aNode);
if (i == NoIndex) {
return nullptr;
}
return ElementAt(i);
}
TextComposition* TextCompositionArray::GetCompositionInContent(
nsPresContext* aPresContext, nsIContent* aContent) {
// There should be only one composition per content object.
for (index_type i = Length(); i > 0; --i) {
nsINode* node = ElementAt(i - 1)->GetEventTargetNode();
if (node && node->IsInclusiveDescendantOf(aContent)) {
return ElementAt(i - 1);
}
}
return nullptr;
}
} // namespace mozilla
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