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gecko-dev/dom/events/IMEContentObserver.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 "mozilla/Logging.h"
#include "ContentEventHandler.h"
#include "IMEContentObserver.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/AutoRestore.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/TextComposition.h"
#include "mozilla/TextEvents.h"
#include "mozilla/dom/Element.h"
#include "nsContentUtils.h"
#include "nsGkAtoms.h"
#include "nsIAtom.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsIDOMDocument.h"
#include "nsIDOMRange.h"
#include "nsIEditorIMESupport.h"
#include "nsIFrame.h"
#include "nsINode.h"
#include "nsIPresShell.h"
#include "nsISelectionController.h"
#include "nsISelectionPrivate.h"
#include "nsISupports.h"
#include "nsIWidget.h"
#include "nsPresContext.h"
#include "nsWeakReference.h"
#include "WritingModes.h"
namespace mozilla {
using namespace widget;
LazyLogModule sIMECOLog("IMEContentObserver");
static const char*
ToChar(bool aBool)
{
return aBool ? "true" : "false";
}
class WritingModeToString final : public nsAutoCString
{
public:
explicit WritingModeToString(const WritingMode& aWritingMode)
{
if (!aWritingMode.IsVertical()) {
AssignLiteral("Horizontal");
return;
}
if (aWritingMode.IsVerticalLR()) {
AssignLiteral("Vertical (LR)");
return;
}
AssignLiteral("Vertical (RL)");
}
virtual ~WritingModeToString() {}
};
class SelectionChangeDataToString final : public nsAutoCString
{
public:
explicit SelectionChangeDataToString(
const IMENotification::SelectionChangeDataBase& aData)
{
if (!aData.IsValid()) {
AppendLiteral("{ IsValid()=false }");
return;
}
AppendPrintf("{ mOffset=%u, ", aData.mOffset);
if (aData.mString->Length() > 20) {
AppendPrintf("mString.Length()=%u, ", aData.mString->Length());
} else {
AppendPrintf("mString=\"%s\" (Length()=%u), ",
NS_ConvertUTF16toUTF8(*aData.mString).get(),
aData.mString->Length());
}
AppendPrintf("GetWritingMode()=%s, mReversed=%s, mCausedByComposition=%s, "
"mCausedBySelectionEvent=%s }",
WritingModeToString(aData.GetWritingMode()).get(),
ToChar(aData.mReversed),
ToChar(aData.mCausedByComposition),
ToChar(aData.mCausedBySelectionEvent));
}
virtual ~SelectionChangeDataToString() {}
};
class TextChangeDataToString final : public nsAutoCString
{
public:
explicit TextChangeDataToString(
const IMENotification::TextChangeDataBase& aData)
{
if (!aData.IsValid()) {
AppendLiteral("{ IsValid()=false }");
return;
}
AppendPrintf("{ mStartOffset=%u, mRemovedEndOffset=%u, mAddedEndOffset=%u, "
"mCausedOnlyByComposition=%s, "
"mIncludingChangesDuringComposition=%s, "
"mIncludingChangesWithoutComposition=%s }",
aData.mStartOffset, aData.mRemovedEndOffset,
aData.mAddedEndOffset,
ToChar(aData.mCausedOnlyByComposition),
ToChar(aData.mIncludingChangesDuringComposition),
ToChar(aData.mIncludingChangesWithoutComposition));
}
virtual ~TextChangeDataToString() {}
};
/******************************************************************************
* mozilla::IMEContentObserver
******************************************************************************/
NS_IMPL_CYCLE_COLLECTION_CLASS(IMEContentObserver)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(IMEContentObserver)
nsAutoScriptBlocker scriptBlocker;
tmp->NotifyIMEOfBlur();
tmp->UnregisterObservers();
NS_IMPL_CYCLE_COLLECTION_UNLINK(mSelection)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mRootContent)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mEditableNode)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocShell)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mEditor)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mEndOfAddedTextCache.mContainerNode)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mStartOfRemovingTextRangeCache.mContainerNode)
tmp->mUpdatePreference.mWantUpdates = nsIMEUpdatePreference::NOTIFY_NOTHING;
tmp->mESM = nullptr;
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(IMEContentObserver)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mWidget)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFocusedWidget)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSelection)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRootContent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEditableNode)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocShell)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEditor)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEndOfAddedTextCache.mContainerNode)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(
mStartOfRemovingTextRangeCache.mContainerNode)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(IMEContentObserver)
NS_INTERFACE_MAP_ENTRY(nsISelectionListener)
NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
NS_INTERFACE_MAP_ENTRY(nsIReflowObserver)
NS_INTERFACE_MAP_ENTRY(nsIScrollObserver)
NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_ENTRY(nsIEditorObserver)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsISelectionListener)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(IMEContentObserver)
NS_IMPL_CYCLE_COLLECTING_RELEASE(IMEContentObserver)
IMEContentObserver::IMEContentObserver()
: mESM(nullptr)
, mSuppressNotifications(0)
, mPreCharacterDataChangeLength(-1)
, mSendingNotification(NOTIFY_IME_OF_NOTHING)
, mIsObserving(false)
, mIMEHasFocus(false)
, mNeedsToNotifyIMEOfFocusSet(false)
, mNeedsToNotifyIMEOfTextChange(false)
, mNeedsToNotifyIMEOfSelectionChange(false)
, mNeedsToNotifyIMEOfPositionChange(false)
, mNeedsToNotifyIMEOfCompositionEventHandled(false)
, mIsHandlingQueryContentEvent(false)
{
#ifdef DEBUG
mTextChangeData.Test();
#endif
}
void
IMEContentObserver::Init(nsIWidget* aWidget,
nsPresContext* aPresContext,
nsIContent* aContent,
nsIEditor* aEditor)
{
State state = GetState();
if (NS_WARN_IF(state == eState_Observing)) {
return; // Nothing to do.
}
bool firstInitialization = state != eState_StoppedObserving;
if (!firstInitialization) {
// If this is now trying to initialize with new contents, all observers
// should be registered again for simpler implementation.
UnregisterObservers();
// Clear members which may not be initialized again.
Clear();
}
mESM = aPresContext->EventStateManager();
mESM->OnStartToObserveContent(this);
mWidget = aWidget;
if (aWidget->GetInputContext().mIMEState.mEnabled == IMEState::PLUGIN) {
if (!InitWithPlugin(aPresContext, aContent)) {
Clear();
return;
}
} else {
if (!InitWithEditor(aPresContext, aContent, aEditor)) {
Clear();
return;
}
}
if (firstInitialization) {
// Now, try to send NOTIFY_IME_OF_FOCUS to IME via the widget.
MaybeNotifyIMEOfFocusSet();
// When this is called first time, IME has not received NOTIFY_IME_OF_FOCUS
// yet since NOTIFY_IME_OF_FOCUS will be sent to widget asynchronously.
// So, we need to do nothing here. After NOTIFY_IME_OF_FOCUS has been
// sent, OnIMEReceivedFocus() will be called and content, selection and/or
// position changes will be observed
return;
}
// When this is called after editor reframing (i.e., the root editable node
// is also recreated), IME has usually received NOTIFY_IME_OF_FOCUS. In this
// case, we need to restart to observe content, selection and/or position
// changes in new root editable node.
ObserveEditableNode();
if (!NeedsToNotifyIMEOfSomething()) {
return;
}
// Some change events may wait to notify IME because this was being
// initialized. It is the time to flush them.
FlushMergeableNotifications();
}
void
IMEContentObserver::OnIMEReceivedFocus()
{
// While Init() notifies IME of focus, pending layout may be flushed
// because the notification may cause querying content. Then, recursive
// call of Init() with the latest content may occur. In such case, we
// shouldn't keep first initialization which notified IME of focus.
if (GetState() != eState_Initializing) {
return;
}
// NOTIFY_IME_OF_FOCUS might cause recreating IMEContentObserver
// instance via IMEStateManager::UpdateIMEState(). So, this
// instance might already have been destroyed, check it.
if (!mRootContent) {
return;
}
// Start to observe which is needed by IME when IME actually has focus.
ObserveEditableNode();
if (!NeedsToNotifyIMEOfSomething()) {
return;
}
// Some change events may wait to notify IME because this was being
// initialized. It is the time to flush them.
FlushMergeableNotifications();
}
bool
IMEContentObserver::InitWithEditor(nsPresContext* aPresContext,
nsIContent* aContent,
nsIEditor* aEditor)
{
MOZ_ASSERT(aEditor);
mEditableNode =
IMEStateManager::GetRootEditableNode(aPresContext, aContent);
if (NS_WARN_IF(!mEditableNode)) {
return false;
}
mEditor = aEditor;
if (NS_WARN_IF(!mEditor)) {
return false;
}
nsIPresShell* presShell = aPresContext->PresShell();
// get selection and root content
nsCOMPtr<nsISelectionController> selCon;
if (mEditableNode->IsNodeOfType(nsINode::eCONTENT)) {
nsIFrame* frame =
static_cast<nsIContent*>(mEditableNode.get())->GetPrimaryFrame();
if (NS_WARN_IF(!frame)) {
return false;
}
frame->GetSelectionController(aPresContext,
getter_AddRefs(selCon));
} else {
// mEditableNode is a document
selCon = do_QueryInterface(presShell);
}
if (NS_WARN_IF(!selCon)) {
return false;
}
selCon->GetSelection(nsISelectionController::SELECTION_NORMAL,
getter_AddRefs(mSelection));
if (NS_WARN_IF(!mSelection)) {
return false;
}
nsCOMPtr<nsIDOMRange> selDomRange;
if (NS_SUCCEEDED(mSelection->GetRangeAt(0, getter_AddRefs(selDomRange)))) {
nsRange* selRange = static_cast<nsRange*>(selDomRange.get());
if (NS_WARN_IF(!selRange) || NS_WARN_IF(!selRange->GetStartParent())) {
return false;
}
mRootContent = selRange->GetStartParent()->
GetSelectionRootContent(presShell);
} else {
mRootContent = mEditableNode->GetSelectionRootContent(presShell);
}
if (!mRootContent && mEditableNode->IsNodeOfType(nsINode::eDOCUMENT)) {
// The document node is editable, but there are no contents, this document
// is not editable.
return false;
}
if (NS_WARN_IF(!mRootContent)) {
return false;
}
mDocShell = aPresContext->GetDocShell();
if (NS_WARN_IF(!mDocShell)) {
return false;
}
MOZ_ASSERT(!WasInitializedWithPlugin());
return true;
}
bool
IMEContentObserver::InitWithPlugin(nsPresContext* aPresContext,
nsIContent* aContent)
{
if (NS_WARN_IF(!aContent) ||
NS_WARN_IF(aContent->GetDesiredIMEState().mEnabled != IMEState::PLUGIN)) {
return false;
}
nsIFrame* frame = aContent->GetPrimaryFrame();
if (NS_WARN_IF(!frame)) {
return false;
}
nsCOMPtr<nsISelectionController> selCon;
frame->GetSelectionController(aPresContext, getter_AddRefs(selCon));
if (NS_WARN_IF(!selCon)) {
return false;
}
selCon->GetSelection(nsISelectionController::SELECTION_NORMAL,
getter_AddRefs(mSelection));
if (NS_WARN_IF(!mSelection)) {
return false;
}
mEditor = nullptr;
mEditableNode = aContent;
mRootContent = aContent;
mDocShell = aPresContext->GetDocShell();
if (NS_WARN_IF(!mDocShell)) {
return false;
}
MOZ_ASSERT(WasInitializedWithPlugin());
return true;
}
bool
IMEContentObserver::WasInitializedWithPlugin() const
{
return mDocShell && !mEditor;
}
void
IMEContentObserver::Clear()
{
mEditor = nullptr;
mSelection = nullptr;
mEditableNode = nullptr;
mRootContent = nullptr;
mDocShell = nullptr;
}
void
IMEContentObserver::ObserveEditableNode()
{
MOZ_RELEASE_ASSERT(mSelection);
MOZ_RELEASE_ASSERT(mRootContent);
MOZ_RELEASE_ASSERT(GetState() != eState_Observing);
// If this is called before sending NOTIFY_IME_OF_FOCUS (it's possible when
// the editor is reframed before sending NOTIFY_IME_OF_FOCUS asynchronously),
// the update preference of mWidget may be different from after the widget
// receives NOTIFY_IME_OF_FOCUS. So, this should be called again by
// OnIMEReceivedFocus() which is called after sending NOTIFY_IME_OF_FOCUS.
if (!mIMEHasFocus) {
MOZ_ASSERT(!mWidget || mNeedsToNotifyIMEOfFocusSet ||
mSendingNotification == NOTIFY_IME_OF_FOCUS,
"Wow, OnIMEReceivedFocus() won't be called?");
return;
}
mIsObserving = true;
if (mEditor) {
mEditor->AddEditorObserver(this);
}
mUpdatePreference = mWidget->GetIMEUpdatePreference();
if (!WasInitializedWithPlugin()) {
// Add selection change listener only when this starts to observe
// non-plugin content since we cannot detect selection changes in
// plugins.
nsCOMPtr<nsISelectionPrivate> selPrivate(do_QueryInterface(mSelection));
NS_ENSURE_TRUE_VOID(selPrivate);
nsresult rv = selPrivate->AddSelectionListener(this);
NS_ENSURE_SUCCESS_VOID(rv);
}
if (mUpdatePreference.WantTextChange()) {
// add text change observer
mRootContent->AddMutationObserver(this);
}
if (mUpdatePreference.WantPositionChanged() && mDocShell) {
// Add scroll position listener and reflow observer to detect position and
// size changes
mDocShell->AddWeakScrollObserver(this);
mDocShell->AddWeakReflowObserver(this);
}
}
void
IMEContentObserver::NotifyIMEOfBlur()
{
// Prevent any notifications to be sent IME.
nsCOMPtr<nsIWidget> widget;
mWidget.swap(widget);
// If we hasn't been set focus, we shouldn't send blur notification to IME.
if (!mIMEHasFocus) {
return;
}
// mWidget must have been non-nullptr if IME has focus.
MOZ_RELEASE_ASSERT(widget);
RefPtr<IMEContentObserver> kungFuDeathGrip(this);
MOZ_LOG(sIMECOLog, LogLevel::Info,
("0x%p IMEContentObserver::NotifyIMEOfBlur(), "
"sending NOTIFY_IME_OF_BLUR", this));
// For now, we need to send blur notification in any condition because
// we don't have any simple ways to send blur notification asynchronously.
// After this call, Destroy() or Unlink() will stop observing the content
// and forget everything. Therefore, if it's not safe to send notification
// when script blocker is unlocked, we cannot send blur notification after
// that and before next focus notification.
// Anyway, as far as we know, IME doesn't try to query content when it loses
// focus. So, this may not cause any problem.
mIMEHasFocus = false;
IMEStateManager::NotifyIME(IMENotification(NOTIFY_IME_OF_BLUR), widget);
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::NotifyIMEOfBlur(), "
"sent NOTIFY_IME_OF_BLUR", this));
}
void
IMEContentObserver::UnregisterObservers()
{
if (!mIsObserving) {
return;
}
mIsObserving = false;
if (mEditor) {
mEditor->RemoveEditorObserver(this);
}
if (mSelection) {
nsCOMPtr<nsISelectionPrivate> selPrivate(do_QueryInterface(mSelection));
if (selPrivate) {
selPrivate->RemoveSelectionListener(this);
}
mSelectionData.Clear();
mFocusedWidget = nullptr;
}
if (mUpdatePreference.WantTextChange() && mRootContent) {
mRootContent->RemoveMutationObserver(this);
}
if (mUpdatePreference.WantPositionChanged() && mDocShell) {
mDocShell->RemoveWeakScrollObserver(this);
mDocShell->RemoveWeakReflowObserver(this);
}
}
nsPresContext*
IMEContentObserver::GetPresContext() const
{
return mESM ? mESM->GetPresContext() : nullptr;
}
void
IMEContentObserver::Destroy()
{
// WARNING: When you change this method, you have to check Unlink() too.
NotifyIMEOfBlur();
UnregisterObservers();
Clear();
mWidget = nullptr;
mUpdatePreference.mWantUpdates = nsIMEUpdatePreference::NOTIFY_NOTHING;
if (mESM) {
mESM->OnStopObservingContent(this);
mESM = nullptr;
}
}
void
IMEContentObserver::DisconnectFromEventStateManager()
{
mESM = nullptr;
}
bool
IMEContentObserver::MaybeReinitialize(nsIWidget* aWidget,
nsPresContext* aPresContext,
nsIContent* aContent,
nsIEditor* aEditor)
{
if (!IsObservingContent(aPresContext, aContent)) {
return false;
}
if (GetState() == eState_StoppedObserving) {
Init(aWidget, aPresContext, aContent, aEditor);
}
return IsManaging(aPresContext, aContent);
}
bool
IMEContentObserver::IsManaging(nsPresContext* aPresContext,
nsIContent* aContent) const
{
return GetState() == eState_Observing &&
IsObservingContent(aPresContext, aContent);
}
bool
IMEContentObserver::IsManaging(const TextComposition* aComposition) const
{
if (GetState() != eState_Observing) {
return false;
}
nsPresContext* presContext = aComposition->GetPresContext();
if (NS_WARN_IF(!presContext)) {
return false;
}
if (presContext != GetPresContext()) {
return false; // observing different document
}
nsINode* targetNode = aComposition->GetEventTargetNode();
nsIContent* targetContent =
targetNode && targetNode->IsContent() ? targetNode->AsContent() : nullptr;
return IsObservingContent(presContext, targetContent);
}
IMEContentObserver::State
IMEContentObserver::GetState() const
{
if (!mSelection || !mRootContent || !mEditableNode) {
return eState_NotObserving; // failed to initialize or finalized.
}
if (!mRootContent->IsInComposedDoc()) {
// the focused editor has already been reframed.
return eState_StoppedObserving;
}
return mIsObserving ? eState_Observing : eState_Initializing;
}
bool
IMEContentObserver::IsObservingContent(nsPresContext* aPresContext,
nsIContent* aContent) const
{
return IsInitializedWithPlugin() ?
mRootContent == aContent && mRootContent != nullptr :
mEditableNode == IMEStateManager::GetRootEditableNode(aPresContext,
aContent);
}
bool
IMEContentObserver::IsEditorHandlingEventForComposition() const
{
if (!mWidget) {
return false;
}
RefPtr<TextComposition> composition =
IMEStateManager::GetTextCompositionFor(mWidget);
if (!composition) {
return false;
}
return composition->IsEditorHandlingEvent();
}
bool
IMEContentObserver::IsEditorComposing() const
{
// Note that don't use TextComposition here. The important thing is,
// whether the editor already started to handle composition because
// web contents can change selection, text content and/or something from
// compositionstart event listener which is run before EditorBase handles it.
nsCOMPtr<nsIEditorIMESupport> editorIMESupport = do_QueryInterface(mEditor);
if (NS_WARN_IF(!editorIMESupport)) {
return false;
}
bool isComposing = false;
nsresult rv = editorIMESupport->GetComposing(&isComposing);
if (NS_WARN_IF(NS_FAILED(rv))) {
return false;
}
return isComposing;
}
nsresult
IMEContentObserver::GetSelectionAndRoot(nsISelection** aSelection,
nsIContent** aRootContent) const
{
if (!mEditableNode || !mSelection) {
return NS_ERROR_NOT_AVAILABLE;
}
NS_ASSERTION(mSelection && mRootContent, "uninitialized content observer");
NS_ADDREF(*aSelection = mSelection);
NS_ADDREF(*aRootContent = mRootContent);
return NS_OK;
}
nsresult
IMEContentObserver::NotifySelectionChanged(nsIDOMDocument* aDOMDocument,
nsISelection* aSelection,
int16_t aReason)
{
int32_t count = 0;
nsresult rv = aSelection->GetRangeCount(&count);
NS_ENSURE_SUCCESS(rv, rv);
if (count > 0 && mWidget) {
bool causedByComposition = IsEditorHandlingEventForComposition();
bool causedBySelectionEvent = TextComposition::IsHandlingSelectionEvent();
bool duringComposition = IsEditorComposing();
MaybeNotifyIMEOfSelectionChange(causedByComposition,
causedBySelectionEvent,
duringComposition);
}
return NS_OK;
}
void
IMEContentObserver::ScrollPositionChanged()
{
MaybeNotifyIMEOfPositionChange();
}
NS_IMETHODIMP
IMEContentObserver::Reflow(DOMHighResTimeStamp aStart,
DOMHighResTimeStamp aEnd)
{
MaybeNotifyIMEOfPositionChange();
return NS_OK;
}
NS_IMETHODIMP
IMEContentObserver::ReflowInterruptible(DOMHighResTimeStamp aStart,
DOMHighResTimeStamp aEnd)
{
MaybeNotifyIMEOfPositionChange();
return NS_OK;
}
nsresult
IMEContentObserver::HandleQueryContentEvent(WidgetQueryContentEvent* aEvent)
{
// If the instance has normal selection cache and the query event queries
// normal selection's range, it should use the cached selection which was
// sent to the widget. However, if this instance has already received new
// selection change notification but hasn't updated the cache yet (i.e.,
// not sending selection change notification to IME, don't use the cached
// value. Note that don't update selection cache here since if you update
// selection cache here, IMENotificationSender won't notify IME of selection
// change because it looks like that the selection isn't actually changed.
bool isSelectionCacheAvailable =
aEvent->mUseNativeLineBreak && mSelectionData.IsValid() &&
!mNeedsToNotifyIMEOfSelectionChange;
if (isSelectionCacheAvailable &&
aEvent->mMessage == eQuerySelectedText &&
aEvent->mInput.mSelectionType == SelectionType::eNormal) {
aEvent->mReply.mContentsRoot = mRootContent;
aEvent->mReply.mHasSelection = !mSelectionData.IsCollapsed();
aEvent->mReply.mOffset = mSelectionData.mOffset;
aEvent->mReply.mString = mSelectionData.String();
aEvent->mReply.mWritingMode = mSelectionData.GetWritingMode();
aEvent->mReply.mReversed = mSelectionData.mReversed;
aEvent->mSucceeded = true;
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::HandleQueryContentEvent(aEvent={ "
"mMessage=%s })", this, ToChar(aEvent->mMessage)));
return NS_OK;
}
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::HandleQueryContentEvent(aEvent={ "
"mMessage=%s })", this, ToChar(aEvent->mMessage)));
// If we can make the event's input offset absolute with TextComposition or
// mSelection, we should set it here for reducing the cost of computing
// selection start offset. If ContentEventHandler receives a
// WidgetQueryContentEvent whose input offset is relative to insertion point,
// it computes current selection start offset (this may be expensive) and
// make the offset absolute value itself.
// Note that calling MakeOffsetAbsolute() makes the event a query event with
// absolute offset. So, ContentEventHandler doesn't pay any additional cost
// after calling MakeOffsetAbsolute() here.
if (aEvent->mInput.mRelativeToInsertionPoint &&
aEvent->mInput.IsValidEventMessage(aEvent->mMessage)) {
RefPtr<TextComposition> composition =
IMEStateManager::GetTextCompositionFor(aEvent->mWidget);
if (composition) {
uint32_t compositionStart = composition->NativeOffsetOfStartComposition();
if (NS_WARN_IF(!aEvent->mInput.MakeOffsetAbsolute(compositionStart))) {
return NS_ERROR_FAILURE;
}
} else if (isSelectionCacheAvailable) {
uint32_t selectionStart = mSelectionData.mOffset;
if (NS_WARN_IF(!aEvent->mInput.MakeOffsetAbsolute(selectionStart))) {
return NS_ERROR_FAILURE;
}
}
}
AutoRestore<bool> handling(mIsHandlingQueryContentEvent);
mIsHandlingQueryContentEvent = true;
ContentEventHandler handler(GetPresContext());
nsresult rv = handler.HandleQueryContentEvent(aEvent);
if (!IsInitializedWithPlugin() &&
NS_WARN_IF(aEvent->mReply.mContentsRoot != mRootContent)) {
// Focus has changed unexpectedly, so make the query fail.
aEvent->mSucceeded = false;
}
return rv;
}
bool
IMEContentObserver::OnMouseButtonEvent(nsPresContext* aPresContext,
WidgetMouseEvent* aMouseEvent)
{
if (!mUpdatePreference.WantMouseButtonEventOnChar()) {
return false;
}
if (!aMouseEvent->IsTrusted() ||
aMouseEvent->DefaultPrevented() ||
!aMouseEvent->mWidget) {
return false;
}
// Now, we need to notify only mouse down and mouse up event.
switch (aMouseEvent->mMessage) {
case eMouseUp:
case eMouseDown:
break;
default:
return false;
}
if (NS_WARN_IF(!mWidget) || NS_WARN_IF(mWidget->Destroyed())) {
return false;
}
RefPtr<IMEContentObserver> kungFuDeathGrip(this);
WidgetQueryContentEvent charAtPt(true, eQueryCharacterAtPoint,
aMouseEvent->mWidget);
charAtPt.mRefPoint = aMouseEvent->mRefPoint;
ContentEventHandler handler(aPresContext);
handler.OnQueryCharacterAtPoint(&charAtPt);
if (NS_WARN_IF(!charAtPt.mSucceeded) ||
charAtPt.mReply.mOffset == WidgetQueryContentEvent::NOT_FOUND) {
return false;
}
// The widget might be destroyed during querying the content since it
// causes flushing layout.
if (!mWidget || NS_WARN_IF(mWidget->Destroyed())) {
return false;
}
// The result character rect is relative to the top level widget.
// We should notify it with offset in the widget.
nsIWidget* topLevelWidget = mWidget->GetTopLevelWidget();
if (topLevelWidget && topLevelWidget != mWidget) {
charAtPt.mReply.mRect.MoveBy(
topLevelWidget->WidgetToScreenOffset() -
mWidget->WidgetToScreenOffset());
}
// The refPt is relative to its widget.
// We should notify it with offset in the widget.
if (aMouseEvent->mWidget != mWidget) {
charAtPt.mRefPoint += aMouseEvent->mWidget->WidgetToScreenOffset() -
mWidget->WidgetToScreenOffset();
}
IMENotification notification(NOTIFY_IME_OF_MOUSE_BUTTON_EVENT);
notification.mMouseButtonEventData.mEventMessage = aMouseEvent->mMessage;
notification.mMouseButtonEventData.mOffset = charAtPt.mReply.mOffset;
notification.mMouseButtonEventData.mCursorPos.Set(
charAtPt.mRefPoint.ToUnknownPoint());
notification.mMouseButtonEventData.mCharRect.Set(
charAtPt.mReply.mRect.ToUnknownRect());
notification.mMouseButtonEventData.mButton = aMouseEvent->button;
notification.mMouseButtonEventData.mButtons = aMouseEvent->buttons;
notification.mMouseButtonEventData.mModifiers = aMouseEvent->mModifiers;
nsresult rv = IMEStateManager::NotifyIME(notification, mWidget);
if (NS_WARN_IF(NS_FAILED(rv))) {
return false;
}
bool consumed = (rv == NS_SUCCESS_EVENT_CONSUMED);
if (consumed) {
aMouseEvent->PreventDefault();
}
return consumed;
}
void
IMEContentObserver::CharacterDataWillChange(nsIDocument* aDocument,
nsIContent* aContent,
CharacterDataChangeInfo* aInfo)
{
NS_ASSERTION(aContent->IsNodeOfType(nsINode::eTEXT),
"character data changed for non-text node");
MOZ_ASSERT(mPreCharacterDataChangeLength < 0,
"CharacterDataChanged() should've reset "
"mPreCharacterDataChangeLength");
mEndOfAddedTextCache.Clear();
mStartOfRemovingTextRangeCache.Clear();
mPreCharacterDataChangeLength =
ContentEventHandler::GetNativeTextLength(aContent, aInfo->mChangeStart,
aInfo->mChangeEnd);
MOZ_ASSERT(mPreCharacterDataChangeLength >=
aInfo->mChangeEnd - aInfo->mChangeStart,
"The computed length must be same as or larger than XP length");
}
void
IMEContentObserver::CharacterDataChanged(nsIDocument* aDocument,
nsIContent* aContent,
CharacterDataChangeInfo* aInfo)
{
NS_ASSERTION(aContent->IsNodeOfType(nsINode::eTEXT),
"character data changed for non-text node");
mEndOfAddedTextCache.Clear();
mStartOfRemovingTextRangeCache.Clear();
int64_t removedLength = mPreCharacterDataChangeLength;
mPreCharacterDataChangeLength = -1;
MOZ_ASSERT(removedLength >= 0,
"mPreCharacterDataChangeLength should've been set by "
"CharacterDataWillChange()");
uint32_t offset = 0;
// get offsets of change and fire notification
nsresult rv =
ContentEventHandler::GetFlatTextLengthInRange(
NodePosition(mRootContent, 0),
NodePosition(aContent, aInfo->mChangeStart),
mRootContent, &offset, LINE_BREAK_TYPE_NATIVE);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
uint32_t newLength =
ContentEventHandler::GetNativeTextLength(aContent, aInfo->mChangeStart,
aInfo->mChangeStart +
aInfo->mReplaceLength);
uint32_t oldEnd = offset + static_cast<uint32_t>(removedLength);
uint32_t newEnd = offset + newLength;
TextChangeData data(offset, oldEnd, newEnd,
IsEditorHandlingEventForComposition(),
IsEditorComposing());
MaybeNotifyIMEOfTextChange(data);
}
void
IMEContentObserver::NotifyContentAdded(nsINode* aContainer,
int32_t aStartIndex,
int32_t aEndIndex)
{
mStartOfRemovingTextRangeCache.Clear();
uint32_t offset = 0;
nsresult rv = NS_OK;
if (!mEndOfAddedTextCache.Match(aContainer, aStartIndex)) {
mEndOfAddedTextCache.Clear();
rv = ContentEventHandler::GetFlatTextLengthInRange(
NodePosition(mRootContent, 0),
NodePositionBefore(aContainer, aStartIndex),
mRootContent, &offset, LINE_BREAK_TYPE_NATIVE);
if (NS_WARN_IF(NS_FAILED((rv)))) {
return;
}
} else {
offset = mEndOfAddedTextCache.mFlatTextLength;
}
// get offset at the end of the last added node
uint32_t addingLength = 0;
rv = ContentEventHandler::GetFlatTextLengthInRange(
NodePositionBefore(aContainer, aStartIndex),
NodePosition(aContainer, aEndIndex),
mRootContent, &addingLength,
LINE_BREAK_TYPE_NATIVE);
if (NS_WARN_IF(NS_FAILED((rv)))) {
mEndOfAddedTextCache.Clear();
return;
}
// If multiple lines are being inserted in an HTML editor, next call of
// NotifyContentAdded() is for adding next node. Therefore, caching the text
// length can skip to compute the text length before the adding node and
// before of it.
mEndOfAddedTextCache.Cache(aContainer, aEndIndex, offset + addingLength);
if (!addingLength) {
return;
}
TextChangeData data(offset, offset, offset + addingLength,
IsEditorHandlingEventForComposition(),
IsEditorComposing());
MaybeNotifyIMEOfTextChange(data);
}
void
IMEContentObserver::ContentAppended(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer)
{
NotifyContentAdded(aContainer, aNewIndexInContainer,
aContainer->GetChildCount());
}
void
IMEContentObserver::ContentInserted(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer)
{
NotifyContentAdded(NODE_FROM(aContainer, aDocument),
aIndexInContainer, aIndexInContainer + 1);
}
void
IMEContentObserver::ContentRemoved(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling)
{
mEndOfAddedTextCache.Clear();
nsINode* containerNode = NODE_FROM(aContainer, aDocument);
uint32_t offset = 0;
nsresult rv = NS_OK;
if (!mStartOfRemovingTextRangeCache.Match(containerNode, aIndexInContainer)) {
// At removing a child node of aContainer, we need the line break caused
// by open tag of aContainer. Be careful when aIndexInContainer is 0.
rv = ContentEventHandler::GetFlatTextLengthInRange(
NodePosition(mRootContent, 0),
NodePosition(containerNode, aIndexInContainer),
mRootContent, &offset, LINE_BREAK_TYPE_NATIVE);
if (NS_WARN_IF(NS_FAILED(rv))) {
mStartOfRemovingTextRangeCache.Clear();
return;
}
mStartOfRemovingTextRangeCache.Cache(containerNode, aIndexInContainer,
offset);
} else {
offset = mStartOfRemovingTextRangeCache.mFlatTextLength;
}
// get offset at the end of the deleted node
uint32_t textLength = 0;
if (aChild->IsNodeOfType(nsINode::eTEXT)) {
textLength = ContentEventHandler::GetNativeTextLength(aChild);
} else {
uint32_t nodeLength = static_cast<int32_t>(aChild->GetChildCount());
rv = ContentEventHandler::GetFlatTextLengthInRange(
NodePositionBefore(aChild, 0),
NodePosition(aChild, nodeLength),
mRootContent, &textLength,
LINE_BREAK_TYPE_NATIVE, true);
if (NS_WARN_IF(NS_FAILED(rv))) {
mStartOfRemovingTextRangeCache.Clear();
return;
}
}
if (!textLength) {
return;
}
TextChangeData data(offset, offset + textLength, offset,
IsEditorHandlingEventForComposition(),
IsEditorComposing());
MaybeNotifyIMEOfTextChange(data);
}
void
IMEContentObserver::AttributeWillChange(nsIDocument* aDocument,
dom::Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aNewValue)
{
mPreAttrChangeLength =
ContentEventHandler::GetNativeTextLengthBefore(aElement, mRootContent);
}
void
IMEContentObserver::AttributeChanged(nsIDocument* aDocument,
dom::Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue)
{
mEndOfAddedTextCache.Clear();
mStartOfRemovingTextRangeCache.Clear();
uint32_t postAttrChangeLength =
ContentEventHandler::GetNativeTextLengthBefore(aElement, mRootContent);
if (postAttrChangeLength == mPreAttrChangeLength) {
return;
}
uint32_t start;
nsresult rv =
ContentEventHandler::GetFlatTextLengthInRange(
NodePosition(mRootContent, 0),
NodePositionBefore(aElement, 0),
mRootContent, &start, LINE_BREAK_TYPE_NATIVE);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
TextChangeData data(start, start + mPreAttrChangeLength,
start + postAttrChangeLength,
IsEditorHandlingEventForComposition(),
IsEditorComposing());
MaybeNotifyIMEOfTextChange(data);
}
void
IMEContentObserver::SuppressNotifyingIME()
{
mSuppressNotifications++;
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::SuppressNotifyingIME(), "
"mSuppressNotifications=%u", this, mSuppressNotifications));
}
void
IMEContentObserver::UnsuppressNotifyingIME()
{
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::UnsuppressNotifyingIME(), "
"mSuppressNotifications=%u", this, mSuppressNotifications));
if (!mSuppressNotifications || --mSuppressNotifications) {
return;
}
FlushMergeableNotifications();
}
NS_IMETHODIMP
IMEContentObserver::EditAction()
{
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::EditAction()", this));
mEndOfAddedTextCache.Clear();
mStartOfRemovingTextRangeCache.Clear();
FlushMergeableNotifications();
return NS_OK;
}
NS_IMETHODIMP
IMEContentObserver::BeforeEditAction()
{
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::BeforeEditAction()", this));
mEndOfAddedTextCache.Clear();
mStartOfRemovingTextRangeCache.Clear();
return NS_OK;
}
NS_IMETHODIMP
IMEContentObserver::CancelEditAction()
{
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::CancelEditAction()", this));
mEndOfAddedTextCache.Clear();
mStartOfRemovingTextRangeCache.Clear();
FlushMergeableNotifications();
return NS_OK;
}
void
IMEContentObserver::PostFocusSetNotification()
{
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::PostFocusSetNotification()", this));
mNeedsToNotifyIMEOfFocusSet = true;
}
void
IMEContentObserver::PostTextChangeNotification()
{
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::PostTextChangeNotification("
"mTextChangeData=%s)",
this, TextChangeDataToString(mTextChangeData).get()));
MOZ_ASSERT(mTextChangeData.IsValid(),
"mTextChangeData must have text change data");
mNeedsToNotifyIMEOfTextChange = true;
}
void
IMEContentObserver::PostSelectionChangeNotification()
{
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::PostSelectionChangeNotification(), "
"mSelectionData={ mCausedByComposition=%s, mCausedBySelectionEvent=%s }",
this, ToChar(mSelectionData.mCausedByComposition),
ToChar(mSelectionData.mCausedBySelectionEvent)));
mNeedsToNotifyIMEOfSelectionChange = true;
}
void
IMEContentObserver::MaybeNotifyIMEOfFocusSet()
{
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::MaybeNotifyIMEOfFocusSet()", this));
PostFocusSetNotification();
FlushMergeableNotifications();
}
void
IMEContentObserver::MaybeNotifyIMEOfTextChange(
const TextChangeDataBase& aTextChangeData)
{
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::MaybeNotifyIMEOfTextChange("
"aTextChangeData=%s)",
this, TextChangeDataToString(aTextChangeData).get()));
mTextChangeData += aTextChangeData;
PostTextChangeNotification();
FlushMergeableNotifications();
}
void
IMEContentObserver::MaybeNotifyIMEOfSelectionChange(
bool aCausedByComposition,
bool aCausedBySelectionEvent,
bool aOccurredDuringComposition)
{
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::MaybeNotifyIMEOfSelectionChange("
"aCausedByComposition=%s, aCausedBySelectionEvent=%s, "
"aOccurredDuringComposition)",
this, ToChar(aCausedByComposition), ToChar(aCausedBySelectionEvent)));
mSelectionData.AssignReason(aCausedByComposition,
aCausedBySelectionEvent,
aOccurredDuringComposition);
PostSelectionChangeNotification();
FlushMergeableNotifications();
}
void
IMEContentObserver::MaybeNotifyIMEOfPositionChange()
{
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::MaybeNotifyIMEOfPositionChange()", this));
// If reflow is caused by ContentEventHandler during PositionChangeEvent
// sending NOTIFY_IME_OF_POSITION_CHANGE, we don't need to notify IME of it
// again since ContentEventHandler returns the result including this reflow's
// result.
if (mIsHandlingQueryContentEvent &&
mSendingNotification == NOTIFY_IME_OF_POSITION_CHANGE) {
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::MaybeNotifyIMEOfPositionChange(), "
"ignored since caused by ContentEventHandler during sending "
"NOTIY_IME_OF_POSITION_CHANGE", this));
return;
}
PostPositionChangeNotification();
FlushMergeableNotifications();
}
void
IMEContentObserver::MaybeNotifyCompositionEventHandled()
{
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::MaybeNotifyCompositionEventHandled()",
this));
PostCompositionEventHandledNotification();
FlushMergeableNotifications();
}
bool
IMEContentObserver::UpdateSelectionCache()
{
MOZ_ASSERT(IsSafeToNotifyIME());
if (WasInitializedWithPlugin()) {
return false;
}
mSelectionData.ClearSelectionData();
// XXX Cannot we cache some information for reducing the cost to compute
// selection offset and writing mode?
WidgetQueryContentEvent selection(true, eQuerySelectedText, mWidget);
ContentEventHandler handler(GetPresContext());
handler.OnQuerySelectedText(&selection);
if (NS_WARN_IF(!selection.mSucceeded) ||
NS_WARN_IF(selection.mReply.mContentsRoot != mRootContent)) {
return false;
}
mFocusedWidget = selection.mReply.mFocusedWidget;
mSelectionData.mOffset = selection.mReply.mOffset;
*mSelectionData.mString = selection.mReply.mString;
mSelectionData.SetWritingMode(selection.GetWritingMode());
mSelectionData.mReversed = selection.mReply.mReversed;
// WARNING: Don't modify the reason of selection change here.
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::UpdateSelectionCache(), "
"mSelectionData=%s",
this, SelectionChangeDataToString(mSelectionData).get()));
return mSelectionData.IsValid();
}
void
IMEContentObserver::PostPositionChangeNotification()
{
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::PostPositionChangeNotification()", this));
mNeedsToNotifyIMEOfPositionChange = true;
}
void
IMEContentObserver::PostCompositionEventHandledNotification()
{
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::"
"PostCompositionEventHandledNotification()", this));
mNeedsToNotifyIMEOfCompositionEventHandled = true;
}
bool
IMEContentObserver::IsReflowLocked() const
{
nsPresContext* presContext = GetPresContext();
if (NS_WARN_IF(!presContext)) {
return false;
}
nsIPresShell* presShell = presContext->GetPresShell();
if (NS_WARN_IF(!presShell)) {
return false;
}
// During reflow, we shouldn't notify IME because IME may query content
// synchronously. Then, it causes ContentEventHandler will try to flush
// pending notifications during reflow.
return presShell->IsReflowLocked();
}
bool
IMEContentObserver::IsSafeToNotifyIME() const
{
// If this is already detached from the widget, this doesn't need to notify
// anything.
if (!mWidget) {
return false;
}
// Don't notify IME of anything if it's not good time to do it.
if (mSuppressNotifications) {
return false;
}
if (!mESM || NS_WARN_IF(!GetPresContext())) {
return false;
}
// If it's in reflow, we should wait to finish the reflow.
// FYI: This should be called again from Reflow() or ReflowInterruptible().
if (IsReflowLocked()) {
return false;
}
// If we're in handling an edit action, this method will be called later.
bool isInEditAction = false;
if (mEditor && NS_SUCCEEDED(mEditor->GetIsInEditAction(&isInEditAction)) &&
isInEditAction) {
return false;
}
return true;
}
void
IMEContentObserver::FlushMergeableNotifications()
{
if (!IsSafeToNotifyIME()) {
// So, if this is already called, this should do nothing.
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::FlushMergeableNotifications(), "
"FAILED, due to unsafe to notify IME", this));
return;
}
// Notifying something may cause nested call of this method. For example,
// when somebody notified one of the notifications may dispatch query content
// event. Then, it causes flushing layout which may cause another layout
// change notification.
if (mQueuedSender) {
// So, if this is already called, this should do nothing.
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::FlushMergeableNotifications(), "
"FAILED, due to already flushing pending notifications", this));
return;
}
if (!NeedsToNotifyIMEOfSomething()) {
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::FlushMergeableNotifications(), "
"FAILED, due to no pending notifications", this));
return;
}
// NOTE: Reset each pending flag because sending notification may cause
// another change.
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::FlushMergeableNotifications(), "
"creating IMENotificationSender...", this));
// If contents in selection range is modified, the selection range still
// has removed node from the tree. In such case, nsContentIterator won't
// work well. Therefore, we shouldn't use AddScriptRunnder() here since
// it may kick runnable event immediately after DOM tree is changed but
// the selection range isn't modified yet.
mQueuedSender = new IMENotificationSender(this);
NS_DispatchToCurrentThread(mQueuedSender);
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::FlushMergeableNotifications(), "
"finished", this));
}
void
IMEContentObserver::TryToFlushPendingNotifications()
{
if (!mQueuedSender || mSendingNotification != NOTIFY_IME_OF_NOTHING) {
return;
}
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::TryToFlushPendingNotifications(), "
"performing queued IMENotificationSender forcibly", this));
RefPtr<IMENotificationSender> queuedSender = mQueuedSender;
queuedSender->Run();
}
/******************************************************************************
* mozilla::IMEContentObserver::AChangeEvent
******************************************************************************/
bool
IMEContentObserver::AChangeEvent::CanNotifyIME(
ChangeEventType aChangeEventType) const
{
if (NS_WARN_IF(!mIMEContentObserver)) {
return false;
}
if (aChangeEventType == eChangeEventType_CompositionEventHandled) {
return mIMEContentObserver->mWidget != nullptr;
}
State state = mIMEContentObserver->GetState();
// If it's not initialized, we should do nothing.
if (state == eState_NotObserving) {
return false;
}
// If setting focus, just check the state.
if (aChangeEventType == eChangeEventType_Focus) {
return !NS_WARN_IF(mIMEContentObserver->mIMEHasFocus);
}
// If we've not notified IME of focus yet, we shouldn't notify anything.
if (!mIMEContentObserver->mIMEHasFocus) {
return false;
}
// If IME has focus, IMEContentObserver must hold the widget.
MOZ_ASSERT(mIMEContentObserver->mWidget);
return true;
}
bool
IMEContentObserver::AChangeEvent::IsSafeToNotifyIME(
ChangeEventType aChangeEventType) const
{
if (NS_WARN_IF(!nsContentUtils::IsSafeToRunScript())) {
return false;
}
// While we're sending a notification, we shouldn't send another notification
// recursively.
if (mIMEContentObserver->mSendingNotification != NOTIFY_IME_OF_NOTHING) {
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::AChangeEvent::IsSafeToNotifyIME(), "
"putting off sending notification due to detecting recursive call, "
"mIMEContentObserver={ mSendingNotification=%s }",
this, ToChar(mIMEContentObserver->mSendingNotification)));
return false;
}
State state = mIMEContentObserver->GetState();
if (aChangeEventType == eChangeEventType_Focus) {
if (NS_WARN_IF(state != eState_Initializing && state != eState_Observing)) {
return false;
}
} else if (aChangeEventType == eChangeEventType_CompositionEventHandled) {
// It doesn't need to check the observing status.
} else if (state != eState_Observing) {
return false;
}
return mIMEContentObserver->IsSafeToNotifyIME();
}
/******************************************************************************
* mozilla::IMEContentObserver::IMENotificationSender
******************************************************************************/
NS_IMETHODIMP
IMEContentObserver::IMENotificationSender::Run()
{
if (NS_WARN_IF(mIsRunning)) {
MOZ_LOG(sIMECOLog, LogLevel::Error,
("0x%p IMEContentObserver::IMENotificationSender::Run(), FAILED, "
"called recursively", this));
return NS_OK;
}
AutoRestore<bool> running(mIsRunning);
mIsRunning = true;
// This instance was already performed forcibly.
if (mIMEContentObserver->mQueuedSender != this) {
return NS_OK;
}
// NOTE: Reset each pending flag because sending notification may cause
// another change.
if (mIMEContentObserver->mNeedsToNotifyIMEOfFocusSet) {
mIMEContentObserver->mNeedsToNotifyIMEOfFocusSet = false;
SendFocusSet();
mIMEContentObserver->mQueuedSender = nullptr;
// If it's not safe to notify IME of focus, SendFocusSet() sets
// mNeedsToNotifyIMEOfFocusSet true again. For guaranteeing to send the
// focus notification later, we should put a new sender into the queue but
// this case must be rare. Note that if mIMEContentObserver is already
// destroyed, mNeedsToNotifyIMEOfFocusSet is never set true again.
if (mIMEContentObserver->mNeedsToNotifyIMEOfFocusSet) {
MOZ_ASSERT(!mIMEContentObserver->mIMEHasFocus);
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::Run(), "
"posting IMENotificationSender to current thread", this));
mIMEContentObserver->mQueuedSender =
new IMENotificationSender(mIMEContentObserver);
NS_DispatchToCurrentThread(mIMEContentObserver->mQueuedSender);
return NS_OK;
}
// This is the first notification to IME. So, we don't need to notify
// anymore since IME starts to query content after it gets focus.
mIMEContentObserver->ClearPendingNotifications();
return NS_OK;
}
if (mIMEContentObserver->mNeedsToNotifyIMEOfTextChange) {
mIMEContentObserver->mNeedsToNotifyIMEOfTextChange = false;
SendTextChange();
}
// If a text change notification causes another text change again, we should
// notify IME of that before sending a selection change notification.
if (!mIMEContentObserver->mNeedsToNotifyIMEOfTextChange) {
// Be aware, PuppetWidget depends on the order of this. A selection change
// notification should not be sent before a text change notification because
// PuppetWidget shouldn't query new text content every selection change.
if (mIMEContentObserver->mNeedsToNotifyIMEOfSelectionChange) {
mIMEContentObserver->mNeedsToNotifyIMEOfSelectionChange = false;
SendSelectionChange();
}
}
// If a text change notification causes another text change again or a
// selection change notification causes either a text change or another
// selection change, we should notify IME of those before sending a position
// change notification.
if (!mIMEContentObserver->mNeedsToNotifyIMEOfTextChange &&
!mIMEContentObserver->mNeedsToNotifyIMEOfSelectionChange) {
if (mIMEContentObserver->mNeedsToNotifyIMEOfPositionChange) {
mIMEContentObserver->mNeedsToNotifyIMEOfPositionChange = false;
SendPositionChange();
}
}
// Composition event handled notification should be sent after all the
// other notifications because this notifies widget of finishing all pending
// events are handled completely.
if (!mIMEContentObserver->mNeedsToNotifyIMEOfTextChange &&
!mIMEContentObserver->mNeedsToNotifyIMEOfSelectionChange &&
!mIMEContentObserver->mNeedsToNotifyIMEOfPositionChange) {
if (mIMEContentObserver->mNeedsToNotifyIMEOfCompositionEventHandled) {
mIMEContentObserver->mNeedsToNotifyIMEOfCompositionEventHandled = false;
SendCompositionEventHandled();
}
}
mIMEContentObserver->mQueuedSender = nullptr;
// If notifications caused some new change, we should notify them now.
if (mIMEContentObserver->NeedsToNotifyIMEOfSomething()) {
if (mIMEContentObserver->GetState() == eState_StoppedObserving) {
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::Run(), "
"waiting IMENotificationSender to be reinitialized", this));
} else {
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::Run(), "
"posting IMENotificationSender to current thread", this));
mIMEContentObserver->mQueuedSender =
new IMENotificationSender(mIMEContentObserver);
NS_DispatchToCurrentThread(mIMEContentObserver->mQueuedSender);
}
}
return NS_OK;
}
void
IMEContentObserver::IMENotificationSender::SendFocusSet()
{
if (!CanNotifyIME(eChangeEventType_Focus)) {
// If IMEContentObserver has already gone, we don't need to notify IME of
// focus.
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendFocusSet(), FAILED, due to impossible to notify IME of focus",
this));
mIMEContentObserver->ClearPendingNotifications();
return;
}
if (!IsSafeToNotifyIME(eChangeEventType_Focus)) {
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendFocusSet(), retrying to send NOTIFY_IME_OF_FOCUS...", this));
mIMEContentObserver->PostFocusSetNotification();
return;
}
mIMEContentObserver->mIMEHasFocus = true;
// Initialize selection cache with the first selection data.
mIMEContentObserver->UpdateSelectionCache();
MOZ_LOG(sIMECOLog, LogLevel::Info,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendFocusSet(), sending NOTIFY_IME_OF_FOCUS...", this));
MOZ_RELEASE_ASSERT(mIMEContentObserver->mSendingNotification ==
NOTIFY_IME_OF_NOTHING);
mIMEContentObserver->mSendingNotification = NOTIFY_IME_OF_FOCUS;
IMEStateManager::NotifyIME(IMENotification(NOTIFY_IME_OF_FOCUS),
mIMEContentObserver->mWidget);
mIMEContentObserver->mSendingNotification = NOTIFY_IME_OF_NOTHING;
// nsIMEUpdatePreference referred by ObserveEditableNode() may be different
// before or after widget receives NOTIFY_IME_OF_FOCUS. Therefore, we need
// to guarantee to call ObserveEditableNode() after sending
// NOTIFY_IME_OF_FOCUS.
mIMEContentObserver->OnIMEReceivedFocus();
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendFocusSet(), sent NOTIFY_IME_OF_FOCUS", this));
}
void
IMEContentObserver::IMENotificationSender::SendSelectionChange()
{
if (!CanNotifyIME(eChangeEventType_Selection)) {
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendSelectionChange(), FAILED, due to impossible to notify IME of "
"selection change", this));
return;
}
if (!IsSafeToNotifyIME(eChangeEventType_Selection)) {
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendSelectionChange(), retrying to send "
"NOTIFY_IME_OF_SELECTION_CHANGE...", this));
mIMEContentObserver->PostSelectionChangeNotification();
return;
}
SelectionChangeData lastSelChangeData = mIMEContentObserver->mSelectionData;
if (NS_WARN_IF(!mIMEContentObserver->UpdateSelectionCache())) {
MOZ_LOG(sIMECOLog, LogLevel::Error,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendSelectionChange(), FAILED, due to UpdateSelectionCache() failure",
this));
return;
}
// The state may be changed since querying content causes flushing layout.
if (!CanNotifyIME(eChangeEventType_Selection)) {
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendSelectionChange(), FAILED, due to flushing layout having changed "
"something", this));
return;
}
// If the selection isn't changed actually, we shouldn't notify IME of
// selection change.
SelectionChangeData& newSelChangeData = mIMEContentObserver->mSelectionData;
if (lastSelChangeData.IsValid() &&
lastSelChangeData.mOffset == newSelChangeData.mOffset &&
lastSelChangeData.String() == newSelChangeData.String() &&
lastSelChangeData.GetWritingMode() == newSelChangeData.GetWritingMode() &&
lastSelChangeData.mReversed == newSelChangeData.mReversed) {
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendSelectionChange(), not notifying IME of "
"NOTIFY_IME_OF_SELECTION_CHANGE due to not changed actually", this));
return;
}
MOZ_LOG(sIMECOLog, LogLevel::Info,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendSelectionChange(), sending NOTIFY_IME_OF_SELECTION_CHANGE... "
"newSelChangeData=%s",
this, SelectionChangeDataToString(newSelChangeData).get()));
IMENotification notification(NOTIFY_IME_OF_SELECTION_CHANGE);
notification.SetData(mIMEContentObserver->mSelectionData);
MOZ_RELEASE_ASSERT(mIMEContentObserver->mSendingNotification ==
NOTIFY_IME_OF_NOTHING);
mIMEContentObserver->mSendingNotification = NOTIFY_IME_OF_SELECTION_CHANGE;
IMEStateManager::NotifyIME(notification, mIMEContentObserver->mWidget);
mIMEContentObserver->mSendingNotification = NOTIFY_IME_OF_NOTHING;
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendSelectionChange(), sent NOTIFY_IME_OF_SELECTION_CHANGE", this));
}
void
IMEContentObserver::IMENotificationSender::SendTextChange()
{
if (!CanNotifyIME(eChangeEventType_Text)) {
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendTextChange(), FAILED, due to impossible to notify IME of text "
"change", this));
return;
}
if (!IsSafeToNotifyIME(eChangeEventType_Text)) {
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendTextChange(), retrying to send NOTIFY_IME_OF_TEXT_CHANGE...",
this));
mIMEContentObserver->PostTextChangeNotification();
return;
}
MOZ_LOG(sIMECOLog, LogLevel::Info,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendTextChange(), sending NOTIFY_IME_OF_TEXT_CHANGE... "
"mIMEContentObserver={ mTextChangeData=%s }",
this, TextChangeDataToString(mIMEContentObserver->mTextChangeData).get()));
IMENotification notification(NOTIFY_IME_OF_TEXT_CHANGE);
notification.SetData(mIMEContentObserver->mTextChangeData);
mIMEContentObserver->mTextChangeData.Clear();
MOZ_RELEASE_ASSERT(mIMEContentObserver->mSendingNotification ==
NOTIFY_IME_OF_NOTHING);
mIMEContentObserver->mSendingNotification = NOTIFY_IME_OF_TEXT_CHANGE;
IMEStateManager::NotifyIME(notification, mIMEContentObserver->mWidget);
mIMEContentObserver->mSendingNotification = NOTIFY_IME_OF_NOTHING;
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendTextChange(), sent NOTIFY_IME_OF_TEXT_CHANGE", this));
}
void
IMEContentObserver::IMENotificationSender::SendPositionChange()
{
if (!CanNotifyIME(eChangeEventType_Position)) {
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendPositionChange(), FAILED, due to impossible to notify IME of "
"position change", this));
return;
}
if (!IsSafeToNotifyIME(eChangeEventType_Position)) {
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendPositionChange(), retrying to send "
"NOTIFY_IME_OF_POSITION_CHANGE...", this));
mIMEContentObserver->PostPositionChangeNotification();
return;
}
MOZ_LOG(sIMECOLog, LogLevel::Info,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendPositionChange(), sending NOTIFY_IME_OF_POSITION_CHANGE...", this));
MOZ_RELEASE_ASSERT(mIMEContentObserver->mSendingNotification ==
NOTIFY_IME_OF_NOTHING);
mIMEContentObserver->mSendingNotification = NOTIFY_IME_OF_POSITION_CHANGE;
IMEStateManager::NotifyIME(IMENotification(NOTIFY_IME_OF_POSITION_CHANGE),
mIMEContentObserver->mWidget);
mIMEContentObserver->mSendingNotification = NOTIFY_IME_OF_NOTHING;
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendPositionChange(), sent NOTIFY_IME_OF_POSITION_CHANGE", this));
}
void
IMEContentObserver::IMENotificationSender::SendCompositionEventHandled()
{
if (!CanNotifyIME(eChangeEventType_CompositionEventHandled)) {
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendCompositionEventHandled(), FAILED, due to impossible to notify "
"IME of composition event handled", this));
return;
}
if (!IsSafeToNotifyIME(eChangeEventType_CompositionEventHandled)) {
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendCompositionEventHandled(), retrying to send "
"NOTIFY_IME_OF_POSITION_CHANGE...", this));
mIMEContentObserver->PostCompositionEventHandledNotification();
return;
}
MOZ_LOG(sIMECOLog, LogLevel::Info,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendCompositionEventHandled(), sending "
"NOTIFY_IME_OF_COMPOSITION_EVENT_HANDLED...", this));
MOZ_RELEASE_ASSERT(mIMEContentObserver->mSendingNotification ==
NOTIFY_IME_OF_NOTHING);
mIMEContentObserver->mSendingNotification =
NOTIFY_IME_OF_COMPOSITION_EVENT_HANDLED;
IMEStateManager::NotifyIME(
IMENotification(NOTIFY_IME_OF_COMPOSITION_EVENT_HANDLED),
mIMEContentObserver->mWidget);
mIMEContentObserver->mSendingNotification = NOTIFY_IME_OF_NOTHING;
MOZ_LOG(sIMECOLog, LogLevel::Debug,
("0x%p IMEContentObserver::IMENotificationSender::"
"SendCompositionEventHandled(), sent "
"NOTIFY_IME_OF_COMPOSITION_EVENT_HANDLED", this));
}
} // namespace mozilla
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