gecko-dev/dom/events/IMEContentObserver.cpp

536 строки
16 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 sw=2 et 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 "mozilla/AsyncEventDispatcher.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/TextComposition.h"
#include "mozilla/dom/Element.h"
#include "nsAutoPtr.h"
#include "nsContentUtils.h"
#include "nsGkAtoms.h"
#include "nsIAtom.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsIDOMDocument.h"
#include "nsIDOMRange.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 "nsThreadUtils.h"
#include "nsWeakReference.h"
namespace mozilla {
using namespace widget;
NS_IMPL_ISUPPORTS5(IMEContentObserver,
nsIMutationObserver,
nsISelectionListener,
nsIReflowObserver,
nsIScrollObserver,
nsISupportsWeakReference)
IMEContentObserver::IMEContentObserver()
{
}
void
IMEContentObserver::Init(nsIWidget* aWidget,
nsPresContext* aPresContext,
nsIContent* aContent)
{
mWidget = aWidget;
mEditableNode = IMEStateManager::GetRootEditableNode(aPresContext, aContent);
if (!mEditableNode) {
return;
}
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();
NS_ENSURE_TRUE_VOID(frame);
frame->GetSelectionController(aPresContext,
getter_AddRefs(selCon));
} else {
// mEditableNode is a document
selCon = do_QueryInterface(presShell);
}
NS_ENSURE_TRUE_VOID(selCon);
selCon->GetSelection(nsISelectionController::SELECTION_NORMAL,
getter_AddRefs(mSelection));
NS_ENSURE_TRUE_VOID(mSelection);
nsCOMPtr<nsIDOMRange> selDomRange;
if (NS_SUCCEEDED(mSelection->GetRangeAt(0, getter_AddRefs(selDomRange)))) {
nsRange* selRange = static_cast<nsRange*>(selDomRange.get());
NS_ENSURE_TRUE_VOID(selRange && selRange->GetStartParent());
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;
}
NS_ENSURE_TRUE_VOID(mRootContent);
if (IMEStateManager::IsTestingIME()) {
nsIDocument* doc = aPresContext->Document();
(new AsyncEventDispatcher(doc, NS_LITERAL_STRING("MozIMEFocusIn"),
false, false))->RunDOMEventWhenSafe();
}
aWidget->NotifyIME(IMENotification(NOTIFY_IME_OF_FOCUS));
// 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;
}
mDocShell = aPresContext->GetDocShell();
ObserveEditableNode();
}
void
IMEContentObserver::ObserveEditableNode()
{
MOZ_ASSERT(mSelection);
MOZ_ASSERT(mRootContent);
mUpdatePreference = mWidget->GetIMEUpdatePreference();
if (mUpdatePreference.WantSelectionChange()) {
// add selection change listener
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::Destroy()
{
// If CreateTextStateManager failed, mRootContent will be null,
// and we should not call NotifyIME(IMENotification(NOTIFY_IME_OF_BLUR))
if (mRootContent) {
if (IMEStateManager::IsTestingIME() && mEditableNode) {
nsIDocument* doc = mEditableNode->OwnerDoc();
(new AsyncEventDispatcher(doc, NS_LITERAL_STRING("MozIMEFocusOut"),
false, false))->RunDOMEventWhenSafe();
}
mWidget->NotifyIME(IMENotification(NOTIFY_IME_OF_BLUR));
}
// Even if there are some pending notification, it'll never notify the widget.
mWidget = nullptr;
if (mUpdatePreference.WantSelectionChange() && mSelection) {
nsCOMPtr<nsISelectionPrivate> selPrivate(do_QueryInterface(mSelection));
if (selPrivate) {
selPrivate->RemoveSelectionListener(this);
}
}
mSelection = nullptr;
if (mUpdatePreference.WantTextChange() && mRootContent) {
mRootContent->RemoveMutationObserver(this);
}
if (mUpdatePreference.WantPositionChanged() && mDocShell) {
mDocShell->RemoveWeakScrollObserver(this);
mDocShell->RemoveWeakReflowObserver(this);
}
mRootContent = nullptr;
mEditableNode = nullptr;
mDocShell = nullptr;
mUpdatePreference.mWantUpdates = nsIMEUpdatePreference::NOTIFY_NOTHING;
}
bool
IMEContentObserver::IsManaging(nsPresContext* aPresContext,
nsIContent* aContent)
{
if (!mSelection || !mRootContent || !mEditableNode) {
return false; // failed to initialize.
}
if (!mRootContent->IsInDoc()) {
return false; // the focused editor has already been reframed.
}
return mEditableNode == IMEStateManager::GetRootEditableNode(aPresContext,
aContent);
}
bool
IMEContentObserver::IsEditorHandlingEventForComposition() const
{
if (!mWidget) {
return false;
}
nsRefPtr<TextComposition> composition =
IMEStateManager::GetTextCompositionFor(mWidget);
if (!composition) {
return false;
}
return composition->IsEditorHandlingEvent();
}
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;
}
// Helper class, used for selection change notification
class SelectionChangeEvent : public nsRunnable
{
public:
SelectionChangeEvent(IMEContentObserver* aDispatcher,
bool aCausedByComposition)
: mDispatcher(aDispatcher)
, mCausedByComposition(aCausedByComposition)
{
MOZ_ASSERT(mDispatcher);
}
NS_IMETHOD Run()
{
if (mDispatcher->GetWidget()) {
IMENotification notification(NOTIFY_IME_OF_SELECTION_CHANGE);
notification.mSelectionChangeData.mCausedByComposition =
mCausedByComposition;
mDispatcher->GetWidget()->NotifyIME(notification);
}
return NS_OK;
}
private:
nsRefPtr<IMEContentObserver> mDispatcher;
bool mCausedByComposition;
};
nsresult
IMEContentObserver::NotifySelectionChanged(nsIDOMDocument* aDOMDocument,
nsISelection* aSelection,
int16_t aReason)
{
bool causedByComposition = IsEditorHandlingEventForComposition();
if (causedByComposition &&
!mUpdatePreference.WantChangesCausedByComposition()) {
return NS_OK;
}
int32_t count = 0;
nsresult rv = aSelection->GetRangeCount(&count);
NS_ENSURE_SUCCESS(rv, rv);
if (count > 0 && mWidget) {
nsContentUtils::AddScriptRunner(
new SelectionChangeEvent(this, causedByComposition));
}
return NS_OK;
}
// Helper class, used for position change notification
class PositionChangeEvent MOZ_FINAL : public nsRunnable
{
public:
PositionChangeEvent(IMEContentObserver* aDispatcher)
: mDispatcher(aDispatcher)
{
MOZ_ASSERT(mDispatcher);
}
NS_IMETHOD Run()
{
if (mDispatcher->GetWidget()) {
mDispatcher->GetWidget()->NotifyIME(
IMENotification(NOTIFY_IME_OF_POSITION_CHANGE));
}
return NS_OK;
}
private:
nsRefPtr<IMEContentObserver> mDispatcher;
};
void
IMEContentObserver::ScrollPositionChanged()
{
if (mWidget) {
nsContentUtils::AddScriptRunner(new PositionChangeEvent(this));
}
}
NS_IMETHODIMP
IMEContentObserver::Reflow(DOMHighResTimeStamp aStart,
DOMHighResTimeStamp aEnd)
{
if (mWidget) {
nsContentUtils::AddScriptRunner(new PositionChangeEvent(this));
}
return NS_OK;
}
NS_IMETHODIMP
IMEContentObserver::ReflowInterruptible(DOMHighResTimeStamp aStart,
DOMHighResTimeStamp aEnd)
{
if (mWidget) {
nsContentUtils::AddScriptRunner(new PositionChangeEvent(this));
}
return NS_OK;
}
// Helper class, used for text change notification
class TextChangeEvent : public nsRunnable
{
public:
TextChangeEvent(IMEContentObserver* aDispatcher,
uint32_t aStart, uint32_t aOldEnd, uint32_t aNewEnd,
bool aCausedByComposition)
: mDispatcher(aDispatcher)
, mStart(aStart)
, mOldEnd(aOldEnd)
, mNewEnd(aNewEnd)
, mCausedByComposition(aCausedByComposition)
{
MOZ_ASSERT(mDispatcher);
}
NS_IMETHOD Run()
{
if (mDispatcher->GetWidget()) {
IMENotification notification(NOTIFY_IME_OF_TEXT_CHANGE);
notification.mTextChangeData.mStartOffset = mStart;
notification.mTextChangeData.mOldEndOffset = mOldEnd;
notification.mTextChangeData.mNewEndOffset = mNewEnd;
notification.mTextChangeData.mCausedByComposition = mCausedByComposition;
mDispatcher->GetWidget()->NotifyIME(notification);
}
return NS_OK;
}
private:
nsRefPtr<IMEContentObserver> mDispatcher;
uint32_t mStart, mOldEnd, mNewEnd;
bool mCausedByComposition;
};
void
IMEContentObserver::CharacterDataChanged(nsIDocument* aDocument,
nsIContent* aContent,
CharacterDataChangeInfo* aInfo)
{
NS_ASSERTION(aContent->IsNodeOfType(nsINode::eTEXT),
"character data changed for non-text node");
bool causedByComposition = IsEditorHandlingEventForComposition();
if (causedByComposition &&
!mUpdatePreference.WantChangesCausedByComposition()) {
return;
}
uint32_t offset = 0;
// get offsets of change and fire notification
nsresult rv =
ContentEventHandler::GetFlatTextOffsetOfRange(mRootContent, aContent,
aInfo->mChangeStart,
&offset);
NS_ENSURE_SUCCESS_VOID(rv);
uint32_t oldEnd = offset + aInfo->mChangeEnd - aInfo->mChangeStart;
uint32_t newEnd = offset + aInfo->mReplaceLength;
nsContentUtils::AddScriptRunner(
new TextChangeEvent(this, offset, oldEnd, newEnd, causedByComposition));
}
void
IMEContentObserver::NotifyContentAdded(nsINode* aContainer,
int32_t aStartIndex,
int32_t aEndIndex)
{
bool causedByComposition = IsEditorHandlingEventForComposition();
if (causedByComposition &&
!mUpdatePreference.WantChangesCausedByComposition()) {
return;
}
uint32_t offset = 0;
nsresult rv =
ContentEventHandler::GetFlatTextOffsetOfRange(mRootContent, aContainer,
aStartIndex, &offset);
NS_ENSURE_SUCCESS_VOID(rv);
// get offset at the end of the last added node
nsIContent* childAtStart = aContainer->GetChildAt(aStartIndex);
uint32_t addingLength = 0;
rv = ContentEventHandler::GetFlatTextOffsetOfRange(childAtStart, aContainer,
aEndIndex, &addingLength);
NS_ENSURE_SUCCESS_VOID(rv);
if (!addingLength) {
return;
}
nsContentUtils::AddScriptRunner(
new TextChangeEvent(this, offset, offset, offset + addingLength,
causedByComposition));
}
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)
{
bool causedByComposition = IsEditorHandlingEventForComposition();
if (causedByComposition &&
!mUpdatePreference.WantChangesCausedByComposition()) {
return;
}
uint32_t offset = 0;
nsresult rv =
ContentEventHandler::GetFlatTextOffsetOfRange(mRootContent,
NODE_FROM(aContainer,
aDocument),
aIndexInContainer, &offset);
NS_ENSURE_SUCCESS_VOID(rv);
// get offset at the end of the deleted node
int32_t nodeLength =
aChild->IsNodeOfType(nsINode::eTEXT) ?
static_cast<int32_t>(aChild->TextLength()) :
std::max(static_cast<int32_t>(aChild->GetChildCount()), 1);
MOZ_ASSERT(nodeLength >= 0, "The node length is out of range");
uint32_t textLength = 0;
rv = ContentEventHandler::GetFlatTextOffsetOfRange(aChild, aChild,
nodeLength, &textLength);
NS_ENSURE_SUCCESS_VOID(rv);
if (!textLength) {
return;
}
nsContentUtils::AddScriptRunner(
new TextChangeEvent(this, offset, offset + textLength, offset,
causedByComposition));
}
static nsIContent*
GetContentBR(dom::Element* aElement)
{
if (!aElement->IsNodeOfType(nsINode::eCONTENT)) {
return nullptr;
}
nsIContent* content = static_cast<nsIContent*>(aElement);
return content->IsHTML(nsGkAtoms::br) ? content : nullptr;
}
void
IMEContentObserver::AttributeWillChange(nsIDocument* aDocument,
dom::Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
nsIContent *content = GetContentBR(aElement);
mPreAttrChangeLength = content ?
ContentEventHandler::GetNativeTextLength(content) : 0;
}
void
IMEContentObserver::AttributeChanged(nsIDocument* aDocument,
dom::Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
bool causedByComposition = IsEditorHandlingEventForComposition();
if (causedByComposition &&
!mUpdatePreference.WantChangesCausedByComposition()) {
return;
}
nsIContent *content = GetContentBR(aElement);
if (!content) {
return;
}
uint32_t postAttrChangeLength =
ContentEventHandler::GetNativeTextLength(content);
if (postAttrChangeLength == mPreAttrChangeLength) {
return;
}
uint32_t start;
nsresult rv =
ContentEventHandler::GetFlatTextOffsetOfRange(mRootContent, content,
0, &start);
NS_ENSURE_SUCCESS_VOID(rv);
nsContentUtils::AddScriptRunner(
new TextChangeEvent(this, start, start + mPreAttrChangeLength,
start + postAttrChangeLength, causedByComposition));
}
} // namespace mozilla