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-rw-r--r--dom/events/TextComposition.cpp1068
1 files changed, 1068 insertions, 0 deletions
diff --git a/dom/events/TextComposition.cpp b/dom/events/TextComposition.cpp
new file mode 100644
index 0000000000..8761a8bbba
--- /dev/null
+++ b/dom/events/TextComposition.cpp
@@ -0,0 +1,1068 @@
+/* -*- 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)
+
+static uint32_t GetOrCreateCompositionId(WidgetCompositionEvent* aEvent) {
+ // If we're in the parent process, return new composition ID.
+ if (XRE_IsParentProcess()) {
+ static uint32_t sNextCompositionId = 1u;
+ if (MOZ_UNLIKELY(sNextCompositionId == UINT32_MAX)) {
+ sNextCompositionId = 1u;
+ }
+ // FYI: When we send the event to a remote process, TextComposition will
+ // set aEvent->mCompositionId to this value. Therefore, we don't need to
+ // set it here.
+ return sNextCompositionId++;
+ }
+ // If aEvent comes from the parent process, the event has composition ID
+ // considered by the parent process. Then, we should use it.
+ // Otherwise, aEvent is synthesized in this process, it won't cross the
+ // process boundary between this process and the parent process. Therefore,
+ // we don't need to set meaningful composition ID for the text composition.
+ return aEvent->mCompositionId;
+}
+
+/******************************************************************************
+ * TextComposition
+ ******************************************************************************/
+
+bool TextComposition::sHandlingSelectionEvent = false;
+
+TextComposition::TextComposition(nsPresContext* aPresContext, nsINode* aNode,
+ BrowserParent* aBrowserParent,
+ WidgetCompositionEvent* aCompositionEvent)
+ : mPresContext(aPresContext),
+ mNode(aNode),
+ mBrowserParent(aBrowserParent),
+ mNativeContext(aCompositionEvent->mNativeIMEContext),
+ mCompositionId(GetOrCreateCompositionId(aCompositionEvent)),
+ 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.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) {
+ Unused << mBrowserParent->SendCompositionEvent(*aCompositionEvent,
+ mCompositionId);
+ }
+
+ // 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,
+ mCompositionId);
+ 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;
+ }
+
+ AutoRestore<bool> saveHandlingSelectionEvent(sHandlingSelectionEvent);
+ sHandlingSelectionEvent = true;
+
+ if (RefPtr<IMEContentObserver> contentObserver =
+ IMEStateManager::GetActiveContentObserver()) {
+ contentObserver->MaybeHandleSelectionEvent(aPresContext, aSelectionEvent);
+ return;
+ }
+
+ ContentEventHandler handler(aPresContext);
+ // 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->IsObserving(*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->IsObserving(*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) {
+ MOZ_ASSERT(this == IMEStateManager::GetTextCompositionFor(aWidget));
+ // 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* aTextComposition, nsINode* aEventTarget,
+ EventMessage aEventMessage, const nsAString& aData,
+ bool aIsSynthesizedEvent)
+ : Runnable("TextComposition::CompositionEventDispatcher"),
+ mTextComposition(aTextComposition),
+ 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