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gecko/dom/events/nsIMEStateManager.cpp

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/* -*- 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 "nsIMEStateManager.h"
#include "HTMLInputElement.h"
#include "nsCOMPtr.h"
#include "nsIPresShell.h"
#include "nsISupports.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsPresContext.h"
#include "nsIDOMMouseEvent.h"
#include "nsContentUtils.h"
#include "nsINode.h"
#include "nsIFrame.h"
#include "nsRange.h"
#include "nsIDOMRange.h"
#include "nsISelection.h"
#include "nsISelectionPrivate.h"
#include "nsISelectionListener.h"
#include "nsISelectionController.h"
#include "nsIMutationObserver.h"
#include "nsContentEventHandler.h"
#include "nsIObserverService.h"
#include "mozilla/Services.h"
#include "nsIFormControl.h"
#include "nsIForm.h"
#include "mozilla/dom/HTMLFormElement.h"
#include "mozilla/Attributes.h"
#include "mozilla/TextEvents.h"
#include "TextComposition.h"
#include "mozilla/Preferences.h"
#include "nsAsyncDOMEvent.h"
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::widget;
// nsTextStateManager notifies widget of any text and selection changes
// in the currently focused editor
// sTextStateObserver points to the currently active nsTextStateManager
// sTextStateObserver is null if there is no focused editor
class nsTextStateManager MOZ_FINAL : public nsISelectionListener,
public nsStubMutationObserver
{
public:
nsTextStateManager()
{
}
NS_DECL_ISUPPORTS
NS_DECL_NSISELECTIONLISTENER
NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTEWILLCHANGE
NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
void Init(nsIWidget* aWidget,
nsPresContext* aPresContext,
nsIContent* aContent);
void Destroy(void);
bool IsManaging(nsPresContext* aPresContext, nsIContent* aContent);
bool IsEditorHandlingEventForComposition() const;
bool KeepAliveDuringDeactive() const
{
return mUpdatePreference.WantDuringDeactive();
}
nsCOMPtr<nsIWidget> mWidget;
nsCOMPtr<nsISelection> mSel;
nsCOMPtr<nsIContent> mRootContent;
nsCOMPtr<nsINode> mEditableNode;
private:
void NotifyContentAdded(nsINode* aContainer, int32_t aStart, int32_t aEnd);
void ObserveEditableNode();
nsIMEUpdatePreference mUpdatePreference;
uint32_t mPreAttrChangeLength;
};
/******************************************************************/
/* nsIMEStateManager */
/******************************************************************/
nsIContent* nsIMEStateManager::sContent = nullptr;
nsPresContext* nsIMEStateManager::sPresContext = nullptr;
bool nsIMEStateManager::sInstalledMenuKeyboardListener = false;
bool nsIMEStateManager::sIsTestingIME = false;
nsTextStateManager* nsIMEStateManager::sTextStateObserver = nullptr;
TextCompositionArray* nsIMEStateManager::sTextCompositions = nullptr;
void
nsIMEStateManager::Shutdown()
{
MOZ_ASSERT(!sTextCompositions || !sTextCompositions->Length());
delete sTextCompositions;
sTextCompositions = nullptr;
}
nsresult
nsIMEStateManager::OnDestroyPresContext(nsPresContext* aPresContext)
{
NS_ENSURE_ARG_POINTER(aPresContext);
// First, if there is a composition in the aPresContext, clean up it.
if (sTextCompositions) {
TextCompositionArray::index_type i =
sTextCompositions->IndexOf(aPresContext);
if (i != TextCompositionArray::NoIndex) {
// there should be only one composition per presContext object.
sTextCompositions->ElementAt(i)->Destroy();
sTextCompositions->RemoveElementAt(i);
MOZ_ASSERT(sTextCompositions->IndexOf(aPresContext) ==
TextCompositionArray::NoIndex);
}
}
if (aPresContext != sPresContext)
return NS_OK;
DestroyTextStateManager();
nsCOMPtr<nsIWidget> widget = sPresContext->GetRootWidget();
if (widget) {
IMEState newState = GetNewIMEState(sPresContext, nullptr);
InputContextAction action(InputContextAction::CAUSE_UNKNOWN,
InputContextAction::LOST_FOCUS);
SetIMEState(newState, nullptr, widget, action);
}
NS_IF_RELEASE(sContent);
sPresContext = nullptr;
return NS_OK;
}
nsresult
nsIMEStateManager::OnRemoveContent(nsPresContext* aPresContext,
nsIContent* aContent)
{
NS_ENSURE_ARG_POINTER(aPresContext);
// First, if there is a composition in the aContent, clean up it.
if (sTextCompositions) {
nsRefPtr<TextComposition> compositionInContent =
sTextCompositions->GetCompositionInContent(aPresContext, aContent);
if (compositionInContent) {
// Try resetting the native IME state. Be aware, typically, this method
// is called during the content being removed. Then, the native
// composition events which are caused by following APIs are ignored due
// to unsafe to run script (in PresShell::HandleEvent()).
nsCOMPtr<nsIWidget> widget = aPresContext->GetRootWidget();
if (widget) {
nsresult rv =
compositionInContent->NotifyIME(REQUEST_TO_CANCEL_COMPOSITION);
if (NS_FAILED(rv)) {
compositionInContent->NotifyIME(REQUEST_TO_COMMIT_COMPOSITION);
}
// By calling the APIs, the composition may have been finished normally.
compositionInContent =
sTextCompositions->GetCompositionFor(
compositionInContent->GetPresContext(),
compositionInContent->GetEventTargetNode());
}
}
// If the compositionInContent is still available, we should finish the
// composition just on the content forcibly.
if (compositionInContent) {
compositionInContent->SynthesizeCommit(true);
}
}
if (!sPresContext || !sContent ||
!nsContentUtils::ContentIsDescendantOf(sContent, aContent)) {
return NS_OK;
}
DestroyTextStateManager();
// Current IME transaction should commit
nsCOMPtr<nsIWidget> widget = sPresContext->GetRootWidget();
if (widget) {
IMEState newState = GetNewIMEState(sPresContext, nullptr);
InputContextAction action(InputContextAction::CAUSE_UNKNOWN,
InputContextAction::LOST_FOCUS);
SetIMEState(newState, nullptr, widget, action);
}
NS_IF_RELEASE(sContent);
sPresContext = nullptr;
return NS_OK;
}
nsresult
nsIMEStateManager::OnChangeFocus(nsPresContext* aPresContext,
nsIContent* aContent,
InputContextAction::Cause aCause)
{
InputContextAction action(aCause);
return OnChangeFocusInternal(aPresContext, aContent, action);
}
nsresult
nsIMEStateManager::OnChangeFocusInternal(nsPresContext* aPresContext,
nsIContent* aContent,
InputContextAction aAction)
{
bool focusActuallyChanging =
(sContent != aContent || sPresContext != aPresContext);
nsCOMPtr<nsIWidget> oldWidget =
sPresContext ? sPresContext->GetRootWidget() : nullptr;
if (oldWidget && focusActuallyChanging) {
// If we're deactivating, we shouldn't commit composition forcibly because
// the user may want to continue the composition.
if (aPresContext) {
NotifyIME(REQUEST_TO_COMMIT_COMPOSITION, oldWidget);
}
}
if (sTextStateObserver &&
(aPresContext || !sTextStateObserver->KeepAliveDuringDeactive()) &&
!sTextStateObserver->IsManaging(aPresContext, aContent)) {
DestroyTextStateManager();
}
if (!aPresContext) {
return NS_OK;
}
nsCOMPtr<nsIWidget> widget =
(sPresContext == aPresContext) ? oldWidget.get() :
aPresContext->GetRootWidget();
if (!widget) {
return NS_OK;
}
IMEState newState = GetNewIMEState(aPresContext, aContent);
if (!focusActuallyChanging) {
// actual focus isn't changing, but if IME enabled state is changing,
// we should do it.
InputContext context = widget->GetInputContext();
if (context.mIMEState.mEnabled == newState.mEnabled) {
// the enabled state isn't changing.
return NS_OK;
}
aAction.mFocusChange = InputContextAction::FOCUS_NOT_CHANGED;
// Even if focus isn't changing actually, we should commit current
// composition here since the IME state is changing.
if (sPresContext && oldWidget && !focusActuallyChanging) {
NotifyIME(REQUEST_TO_COMMIT_COMPOSITION, oldWidget);
}
} else if (aAction.mFocusChange == InputContextAction::FOCUS_NOT_CHANGED) {
// If aContent isn't null or aContent is null but editable, somebody gets
// focus.
bool gotFocus = aContent || (newState.mEnabled == IMEState::ENABLED);
aAction.mFocusChange =
gotFocus ? InputContextAction::GOT_FOCUS : InputContextAction::LOST_FOCUS;
}
// Update IME state for new focus widget
SetIMEState(newState, aContent, widget, aAction);
sPresContext = aPresContext;
if (sContent != aContent) {
NS_IF_RELEASE(sContent);
NS_IF_ADDREF(sContent = aContent);
}
// Don't call CreateTextStateManager() here, it should be called from
// focus event handler of editor.
return NS_OK;
}
void
nsIMEStateManager::OnInstalledMenuKeyboardListener(bool aInstalling)
{
sInstalledMenuKeyboardListener = aInstalling;
InputContextAction action(InputContextAction::CAUSE_UNKNOWN,
aInstalling ? InputContextAction::MENU_GOT_PSEUDO_FOCUS :
InputContextAction::MENU_LOST_PSEUDO_FOCUS);
OnChangeFocusInternal(sPresContext, sContent, action);
}
void
nsIMEStateManager::OnClickInEditor(nsPresContext* aPresContext,
nsIContent* aContent,
nsIDOMMouseEvent* aMouseEvent)
{
if (sPresContext != aPresContext || sContent != aContent) {
return;
}
nsCOMPtr<nsIWidget> widget = aPresContext->GetRootWidget();
NS_ENSURE_TRUE_VOID(widget);
bool isTrusted;
nsresult rv = aMouseEvent->GetIsTrusted(&isTrusted);
NS_ENSURE_SUCCESS_VOID(rv);
if (!isTrusted) {
return; // ignore untrusted event.
}
int16_t button;
rv = aMouseEvent->GetButton(&button);
NS_ENSURE_SUCCESS_VOID(rv);
if (button != 0) {
return; // not a left click event.
}
int32_t clickCount;
rv = aMouseEvent->GetDetail(&clickCount);
NS_ENSURE_SUCCESS_VOID(rv);
if (clickCount != 1) {
return; // should notify only first click event.
}
InputContextAction action(InputContextAction::CAUSE_MOUSE,
InputContextAction::FOCUS_NOT_CHANGED);
IMEState newState = GetNewIMEState(aPresContext, aContent);
SetIMEState(newState, aContent, widget, action);
}
void
nsIMEStateManager::OnFocusInEditor(nsPresContext* aPresContext,
nsIContent* aContent)
{
if (sPresContext != aPresContext || sContent != aContent) {
return;
}
// If the nsTextStateManager instance isn't managing the editor actually,
// we need to recreate the instance.
if (sTextStateObserver) {
if (sTextStateObserver->IsManaging(aPresContext, aContent)) {
return;
}
DestroyTextStateManager();
}
CreateTextStateManager();
}
void
nsIMEStateManager::UpdateIMEState(const IMEState &aNewIMEState,
nsIContent* aContent)
{
if (!sPresContext) {
NS_WARNING("ISM doesn't know which editor has focus");
return;
}
nsCOMPtr<nsIWidget> widget = sPresContext->GetRootWidget();
if (!widget) {
NS_WARNING("focused widget is not found");
return;
}
// If the nsTextStateManager instance isn't managing the editor's current
// editable root content, the editor frame might be reframed. We should
// recreate the instance at that time.
bool createTextStateManager =
(!sTextStateObserver ||
!sTextStateObserver->IsManaging(sPresContext, aContent));
bool updateIMEState =
(widget->GetInputContext().mIMEState.mEnabled != aNewIMEState.mEnabled);
if (updateIMEState) {
// commit current composition before modifying IME state.
NotifyIME(REQUEST_TO_COMMIT_COMPOSITION, widget);
}
if (createTextStateManager) {
DestroyTextStateManager();
}
if (updateIMEState) {
InputContextAction action(InputContextAction::CAUSE_UNKNOWN,
InputContextAction::FOCUS_NOT_CHANGED);
SetIMEState(aNewIMEState, aContent, widget, action);
}
if (createTextStateManager) {
CreateTextStateManager();
}
}
IMEState
nsIMEStateManager::GetNewIMEState(nsPresContext* aPresContext,
nsIContent* aContent)
{
// On Printing or Print Preview, we don't need IME.
if (aPresContext->Type() == nsPresContext::eContext_PrintPreview ||
aPresContext->Type() == nsPresContext::eContext_Print) {
return IMEState(IMEState::DISABLED);
}
if (sInstalledMenuKeyboardListener) {
return IMEState(IMEState::DISABLED);
}
if (!aContent) {
// Even if there are no focused content, the focused document might be
// editable, such case is design mode.
nsIDocument* doc = aPresContext->Document();
if (doc && doc->HasFlag(NODE_IS_EDITABLE)) {
return IMEState(IMEState::ENABLED);
}
return IMEState(IMEState::DISABLED);
}
return aContent->GetDesiredIMEState();
}
// Helper class, used for IME enabled state change notification
class IMEEnabledStateChangedEvent : public nsRunnable {
public:
IMEEnabledStateChangedEvent(uint32_t aState)
: mState(aState)
{
}
NS_IMETHOD Run() {
nsCOMPtr<nsIObserverService> observerService = mozilla::services::GetObserverService();
if (observerService) {
nsAutoString state;
state.AppendInt(mState);
observerService->NotifyObservers(nullptr, "ime-enabled-state-changed", state.get());
}
return NS_OK;
}
private:
uint32_t mState;
};
void
nsIMEStateManager::SetIMEState(const IMEState &aState,
nsIContent* aContent,
nsIWidget* aWidget,
InputContextAction aAction)
{
NS_ENSURE_TRUE_VOID(aWidget);
InputContext oldContext = aWidget->GetInputContext();
InputContext context;
context.mIMEState = aState;
if (aContent && aContent->GetNameSpaceID() == kNameSpaceID_XHTML &&
(aContent->Tag() == nsGkAtoms::input ||
aContent->Tag() == nsGkAtoms::textarea)) {
if (aContent->Tag() != nsGkAtoms::textarea) {
// <input type=number> has an anonymous <input type=text> descendant
// that gets focus whenever anyone tries to focus the number control. We
// need to check if aContent is one of those anonymous text controls and,
// if so, use the number control instead:
nsIContent* content = aContent;
HTMLInputElement* inputElement =
HTMLInputElement::FromContentOrNull(aContent);
if (inputElement) {
HTMLInputElement* ownerNumberControl =
inputElement->GetOwnerNumberControl();
if (ownerNumberControl) {
content = ownerNumberControl; // an <input type=number>
}
}
content->GetAttr(kNameSpaceID_None, nsGkAtoms::type,
context.mHTMLInputType);
} else {
context.mHTMLInputType.Assign(nsGkAtoms::textarea->GetUTF16String());
}
if (Preferences::GetBool("dom.forms.inputmode", false)) {
aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::inputmode,
context.mHTMLInputInputmode);
}
aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::moz_action_hint,
context.mActionHint);
// if we don't have an action hint and return won't submit the form use "next"
if (context.mActionHint.IsEmpty() && aContent->Tag() == nsGkAtoms::input) {
bool willSubmit = false;
nsCOMPtr<nsIFormControl> control(do_QueryInterface(aContent));
mozilla::dom::Element* formElement = control->GetFormElement();
nsCOMPtr<nsIForm> form;
if (control) {
// is this a form and does it have a default submit element?
if ((form = do_QueryInterface(formElement)) && form->GetDefaultSubmitElement()) {
willSubmit = true;
// is this an html form and does it only have a single text input element?
} else if (formElement && formElement->Tag() == nsGkAtoms::form && formElement->IsHTML() &&
!static_cast<dom::HTMLFormElement*>(formElement)->ImplicitSubmissionIsDisabled()) {
willSubmit = true;
}
}
context.mActionHint.Assign(willSubmit ? control->GetType() == NS_FORM_INPUT_SEARCH
? NS_LITERAL_STRING("search")
: NS_LITERAL_STRING("go")
: formElement
? NS_LITERAL_STRING("next")
: EmptyString());
}
}
// XXX I think that we should use nsContentUtils::IsCallerChrome() instead
// of the process type.
if (aAction.mCause == InputContextAction::CAUSE_UNKNOWN &&
XRE_GetProcessType() != GeckoProcessType_Content) {
aAction.mCause = InputContextAction::CAUSE_UNKNOWN_CHROME;
}
aWidget->SetInputContext(context, aAction);
if (oldContext.mIMEState.mEnabled != context.mIMEState.mEnabled) {
nsContentUtils::AddScriptRunner(
new IMEEnabledStateChangedEvent(context.mIMEState.mEnabled));
}
}
void
nsIMEStateManager::EnsureTextCompositionArray()
{
if (sTextCompositions) {
return;
}
sTextCompositions = new TextCompositionArray();
}
void
nsIMEStateManager::DispatchCompositionEvent(nsINode* aEventTargetNode,
nsPresContext* aPresContext,
WidgetEvent* aEvent,
nsEventStatus* aStatus,
nsDispatchingCallback* aCallBack)
{
MOZ_ASSERT(aEvent->eventStructType == NS_COMPOSITION_EVENT ||
aEvent->eventStructType == NS_TEXT_EVENT);
if (!aEvent->mFlags.mIsTrusted || aEvent->mFlags.mPropagationStopped) {
return;
}
EnsureTextCompositionArray();
WidgetGUIEvent* GUIEvent = aEvent->AsGUIEvent();
nsRefPtr<TextComposition> composition =
sTextCompositions->GetCompositionFor(GUIEvent->widget);
if (!composition) {
MOZ_ASSERT(GUIEvent->message == NS_COMPOSITION_START);
composition = new TextComposition(aPresContext, aEventTargetNode, GUIEvent);
sTextCompositions->AppendElement(composition);
}
#ifdef DEBUG
else {
MOZ_ASSERT(GUIEvent->message != NS_COMPOSITION_START);
}
#endif // #ifdef DEBUG
// Dispatch the event on composing target.
composition->DispatchEvent(GUIEvent, aStatus, aCallBack);
// WARNING: the |composition| might have been destroyed already.
// Remove the ended composition from the array.
if (aEvent->message == NS_COMPOSITION_END) {
TextCompositionArray::index_type i =
sTextCompositions->IndexOf(GUIEvent->widget);
if (i != TextCompositionArray::NoIndex) {
sTextCompositions->ElementAt(i)->Destroy();
sTextCompositions->RemoveElementAt(i);
}
}
}
// static
nsresult
nsIMEStateManager::NotifyIME(IMEMessage aMessage,
nsIWidget* aWidget)
{
NS_ENSURE_TRUE(aWidget, NS_ERROR_INVALID_ARG);
nsRefPtr<TextComposition> composition;
if (sTextCompositions) {
composition = sTextCompositions->GetCompositionFor(aWidget);
}
if (!composition || !composition->IsSynthesizedForTests()) {
switch (aMessage) {
case NOTIFY_IME_OF_CURSOR_POS_CHANGED:
return aWidget->NotifyIME(IMENotification(aMessage));
case REQUEST_TO_COMMIT_COMPOSITION:
case REQUEST_TO_CANCEL_COMPOSITION:
case NOTIFY_IME_OF_COMPOSITION_UPDATE:
return composition ?
aWidget->NotifyIME(IMENotification(aMessage)) : NS_OK;
default:
MOZ_CRASH("Unsupported notification");
}
MOZ_CRASH(
"Failed to handle the notification for non-synthesized composition");
}
// If the composition is synthesized events for automated tests, we should
// dispatch composition events for emulating the native composition behavior.
// NOTE: The dispatched events are discarded if it's not safe to run script.
switch (aMessage) {
case REQUEST_TO_COMMIT_COMPOSITION: {
nsCOMPtr<nsIWidget> widget(aWidget);
nsEventStatus status = nsEventStatus_eIgnore;
if (!composition->LastData().IsEmpty()) {
WidgetTextEvent textEvent(true, NS_TEXT_TEXT, widget);
textEvent.theText = composition->LastData();
textEvent.mFlags.mIsSynthesizedForTests = true;
widget->DispatchEvent(&textEvent, status);
if (widget->Destroyed()) {
return NS_OK;
}
}
status = nsEventStatus_eIgnore;
WidgetCompositionEvent endEvent(true, NS_COMPOSITION_END, widget);
endEvent.data = composition->LastData();
endEvent.mFlags.mIsSynthesizedForTests = true;
widget->DispatchEvent(&endEvent, status);
return NS_OK;
}
case REQUEST_TO_CANCEL_COMPOSITION: {
nsCOMPtr<nsIWidget> widget(aWidget);
nsEventStatus status = nsEventStatus_eIgnore;
if (!composition->LastData().IsEmpty()) {
WidgetCompositionEvent updateEvent(true, NS_COMPOSITION_UPDATE, widget);
updateEvent.data = composition->LastData();
updateEvent.mFlags.mIsSynthesizedForTests = true;
widget->DispatchEvent(&updateEvent, status);
if (widget->Destroyed()) {
return NS_OK;
}
status = nsEventStatus_eIgnore;
WidgetTextEvent textEvent(true, NS_TEXT_TEXT, widget);
textEvent.theText = composition->LastData();
textEvent.mFlags.mIsSynthesizedForTests = true;
widget->DispatchEvent(&textEvent, status);
if (widget->Destroyed()) {
return NS_OK;
}
}
status = nsEventStatus_eIgnore;
WidgetCompositionEvent endEvent(true, NS_COMPOSITION_END, widget);
endEvent.data = composition->LastData();
endEvent.mFlags.mIsSynthesizedForTests = true;
widget->DispatchEvent(&endEvent, status);
return NS_OK;
}
default:
return NS_OK;
}
}
// static
nsresult
nsIMEStateManager::NotifyIME(IMEMessage aMessage,
nsPresContext* aPresContext)
{
NS_ENSURE_TRUE(aPresContext, NS_ERROR_INVALID_ARG);
nsIWidget* widget = aPresContext->GetRootWidget();
if (!widget) {
return NS_ERROR_NOT_AVAILABLE;
}
return NotifyIME(aMessage, widget);
}
void
nsTextStateManager::Init(nsIWidget* aWidget,
nsPresContext* aPresContext,
nsIContent* aContent)
{
mWidget = aWidget;
mEditableNode =
nsIMEStateManager::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(mSel));
NS_ENSURE_TRUE_VOID(mSel);
nsCOMPtr<nsIDOMRange> selDomRange;
if (NS_SUCCEEDED(mSel->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 (nsIMEStateManager::sIsTestingIME) {
nsIDocument* doc = aPresContext->Document();
(new nsAsyncDOMEvent(doc, NS_LITERAL_STRING("MozIMEFocusIn"),
false, false))->RunDOMEventWhenSafe();
}
aWidget->NotifyIME(IMENotification(NOTIFY_IME_OF_FOCUS));
// NOTIFY_IME_OF_FOCUS might cause recreating nsTextStateManager
// instance via nsIMEStateManager::UpdateIMEState(). So, this
// instance might already have been destroyed, check it.
if (!mRootContent) {
return;
}
ObserveEditableNode();
}
void
nsTextStateManager::ObserveEditableNode()
{
MOZ_ASSERT(mSel);
MOZ_ASSERT(mRootContent);
mUpdatePreference = mWidget->GetIMEUpdatePreference();
if (mUpdatePreference.WantSelectionChange()) {
// add selection change listener
nsCOMPtr<nsISelectionPrivate> selPrivate(do_QueryInterface(mSel));
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);
}
}
void
nsTextStateManager::Destroy(void)
{
// If CreateTextStateManager failed, mRootContent will be null,
// and we should not call NotifyIME(IMENotification(NOTIFY_IME_OF_BLUR))
if (mRootContent) {
if (nsIMEStateManager::sIsTestingIME && mEditableNode) {
nsIDocument* doc = mEditableNode->OwnerDoc();
(new nsAsyncDOMEvent(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() && mSel) {
nsCOMPtr<nsISelectionPrivate> selPrivate(do_QueryInterface(mSel));
if (selPrivate)
selPrivate->RemoveSelectionListener(this);
}
mSel = nullptr;
if (mUpdatePreference.WantTextChange() && mRootContent) {
mRootContent->RemoveMutationObserver(this);
}
mRootContent = nullptr;
mEditableNode = nullptr;
mUpdatePreference.mWantUpdates = nsIMEUpdatePreference::NOTIFY_NOTHING;
}
bool
nsTextStateManager::IsManaging(nsPresContext* aPresContext,
nsIContent* aContent)
{
if (!mSel || !mRootContent || !mEditableNode) {
return false; // failed to initialize.
}
if (!mRootContent->IsInDoc()) {
return false; // the focused editor has already been reframed.
}
return mEditableNode == nsIMEStateManager::GetRootEditableNode(aPresContext,
aContent);
}
bool
nsTextStateManager::IsEditorHandlingEventForComposition() const
{
if (!mWidget) {
return false;
}
nsRefPtr<TextComposition> composition =
nsIMEStateManager::GetTextCompositionFor(mWidget);
if (!composition) {
return false;
}
return composition->IsEditorHandlingEvent();
}
NS_IMPL_ISUPPORTS2(nsTextStateManager,
nsIMutationObserver,
nsISelectionListener)
// Helper class, used for selection change notification
class SelectionChangeEvent : public nsRunnable {
public:
SelectionChangeEvent(nsTextStateManager *aDispatcher,
bool aCausedByComposition)
: mDispatcher(aDispatcher)
, mCausedByComposition(aCausedByComposition)
{
MOZ_ASSERT(mDispatcher);
}
NS_IMETHOD Run() {
if (mDispatcher->mWidget) {
IMENotification notification(NOTIFY_IME_OF_SELECTION_CHANGE);
notification.mSelectionChangeData.mCausedByComposition =
mCausedByComposition;
mDispatcher->mWidget->NotifyIME(notification);
}
return NS_OK;
}
private:
nsRefPtr<nsTextStateManager> mDispatcher;
bool mCausedByComposition;
};
nsresult
nsTextStateManager::NotifySelectionChanged(nsIDOMDocument* aDoc,
nsISelection* aSel,
int16_t aReason)
{
bool causedByComposition = IsEditorHandlingEventForComposition();
if (causedByComposition &&
!mUpdatePreference.WantChangesCausedByComposition()) {
return NS_OK;
}
int32_t count = 0;
nsresult rv = aSel->GetRangeCount(&count);
NS_ENSURE_SUCCESS(rv, rv);
if (count > 0 && mWidget) {
nsContentUtils::AddScriptRunner(
new SelectionChangeEvent(this, causedByComposition));
}
return NS_OK;
}
// Helper class, used for text change notification
class TextChangeEvent : public nsRunnable {
public:
TextChangeEvent(nsTextStateManager* 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->mWidget) {
IMENotification notification(NOTIFY_IME_OF_TEXT_CHANGE);
notification.mTextChangeData.mStartOffset = mStart;
notification.mTextChangeData.mOldEndOffset = mOldEnd;
notification.mTextChangeData.mNewEndOffset = mNewEnd;
notification.mTextChangeData.mCausedByComposition = mCausedByComposition;
mDispatcher->mWidget->NotifyIME(notification);
}
return NS_OK;
}
private:
nsRefPtr<nsTextStateManager> mDispatcher;
uint32_t mStart, mOldEnd, mNewEnd;
bool mCausedByComposition;
};
void
nsTextStateManager::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
if (NS_FAILED(nsContentEventHandler::GetFlatTextOffsetOfRange(
mRootContent, aContent, aInfo->mChangeStart, &offset)))
return;
uint32_t oldEnd = offset + aInfo->mChangeEnd - aInfo->mChangeStart;
uint32_t newEnd = offset + aInfo->mReplaceLength;
nsContentUtils::AddScriptRunner(
new TextChangeEvent(this, offset, oldEnd, newEnd, causedByComposition));
}
void
nsTextStateManager::NotifyContentAdded(nsINode* aContainer,
int32_t aStartIndex,
int32_t aEndIndex)
{
bool causedByComposition = IsEditorHandlingEventForComposition();
if (causedByComposition &&
!mUpdatePreference.WantChangesCausedByComposition()) {
return;
}
uint32_t offset = 0, newOffset = 0;
if (NS_FAILED(nsContentEventHandler::GetFlatTextOffsetOfRange(
mRootContent, aContainer, aStartIndex, &offset)))
return;
// get offset at the end of the last added node
if (NS_FAILED(nsContentEventHandler::GetFlatTextOffsetOfRange(
aContainer->GetChildAt(aStartIndex),
aContainer, aEndIndex, &newOffset)))
return;
// fire notification
if (newOffset) {
nsContentUtils::AddScriptRunner(
new TextChangeEvent(this, offset, offset, offset + newOffset,
causedByComposition));
}
}
void
nsTextStateManager::ContentAppended(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer)
{
NotifyContentAdded(aContainer, aNewIndexInContainer,
aContainer->GetChildCount());
}
void
nsTextStateManager::ContentInserted(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer)
{
NotifyContentAdded(NODE_FROM(aContainer, aDocument),
aIndexInContainer, aIndexInContainer + 1);
}
void
nsTextStateManager::ContentRemoved(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling)
{
bool causedByComposition = IsEditorHandlingEventForComposition();
if (causedByComposition &&
!mUpdatePreference.WantChangesCausedByComposition()) {
return;
}
uint32_t offset = 0, childOffset = 1;
if (NS_FAILED(nsContentEventHandler::GetFlatTextOffsetOfRange(
mRootContent, NODE_FROM(aContainer, aDocument),
aIndexInContainer, &offset)))
return;
// get offset at the end of the deleted node
if (aChild->IsNodeOfType(nsINode::eTEXT))
childOffset = aChild->TextLength();
else if (0 < aChild->GetChildCount())
childOffset = aChild->GetChildCount();
if (NS_FAILED(nsContentEventHandler::GetFlatTextOffsetOfRange(
aChild, aChild, childOffset, &childOffset)))
return;
// fire notification
if (childOffset) {
nsContentUtils::AddScriptRunner(
new TextChangeEvent(this, offset, offset + childOffset, offset,
causedByComposition));
}
}
static nsIContent*
GetContentBR(mozilla::dom::Element *aElement) {
if (!aElement->IsNodeOfType(nsINode::eCONTENT)) {
return nullptr;
}
nsIContent *content = static_cast<nsIContent*>(aElement);
return content->IsHTML(nsGkAtoms::br) ? content : nullptr;
}
void
nsTextStateManager::AttributeWillChange(nsIDocument* aDocument,
mozilla::dom::Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
nsIContent *content = GetContentBR(aElement);
mPreAttrChangeLength = content ?
nsContentEventHandler::GetNativeTextLength(content) : 0;
}
void
nsTextStateManager::AttributeChanged(nsIDocument* aDocument,
mozilla::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 =
nsContentEventHandler::GetNativeTextLength(content);
if (postAttrChangeLength != mPreAttrChangeLength) {
uint32_t start;
if (NS_SUCCEEDED(nsContentEventHandler::GetFlatTextOffsetOfRange(
mRootContent, content, 0, &start))) {
nsContentUtils::AddScriptRunner(new TextChangeEvent(this, start,
start + mPreAttrChangeLength, start + postAttrChangeLength,
causedByComposition));
}
}
}
bool
nsIMEStateManager::IsEditable(nsINode* node)
{
if (node->IsEditable()) {
return true;
}
// |node| might be readwrite (for example, a text control)
if (node->IsElement() && node->AsElement()->State().HasState(NS_EVENT_STATE_MOZ_READWRITE)) {
return true;
}
return false;
}
nsINode*
nsIMEStateManager::GetRootEditableNode(nsPresContext* aPresContext,
nsIContent* aContent)
{
if (aContent) {
nsINode* root = nullptr;
nsINode* node = aContent;
while (node && IsEditable(node)) {
root = node;
node = node->GetParentNode();
}
return root;
}
if (aPresContext) {
nsIDocument* document = aPresContext->Document();
if (document && document->IsEditable())
return document;
}
return nullptr;
}
bool
nsIMEStateManager::IsEditableIMEState(nsIWidget* aWidget)
{
switch (aWidget->GetInputContext().mIMEState.mEnabled) {
case widget::IMEState::ENABLED:
case widget::IMEState::PASSWORD:
return true;
case widget::IMEState::PLUGIN:
case widget::IMEState::DISABLED:
return false;
default:
MOZ_CRASH("Unknown IME enable state");
}
}
void
nsIMEStateManager::DestroyTextStateManager()
{
if (!sTextStateObserver) {
return;
}
nsRefPtr<nsTextStateManager> tsm;
tsm.swap(sTextStateObserver);
tsm->Destroy();
}
void
nsIMEStateManager::CreateTextStateManager()
{
if (sTextStateObserver) {
NS_WARNING("text state observer has been there already");
MOZ_ASSERT(sTextStateObserver->IsManaging(sPresContext, sContent));
return;
}
nsCOMPtr<nsIWidget> widget = sPresContext->GetRootWidget();
if (!widget) {
return; // Sometimes, there are no widgets.
}
// If it's not text ediable, we don't need to create nsTextStateManager.
if (!IsEditableIMEState(widget)) {
return;
}
static bool sInitializeIsTestingIME = true;
if (sInitializeIsTestingIME) {
Preferences::AddBoolVarCache(&sIsTestingIME, "test.IME", false);
sInitializeIsTestingIME = false;
}
sTextStateObserver = new nsTextStateManager();
NS_ADDREF(sTextStateObserver);
// nsTextStateManager::Init() might create another nsTextStateManager
// instance. So, sTextStateObserver would be replaced with new one.
// We should hold the current instance here.
nsRefPtr<nsTextStateManager> kungFuDeathGrip(sTextStateObserver);
sTextStateObserver->Init(widget, sPresContext, sContent);
}
nsresult
nsIMEStateManager::GetFocusSelectionAndRoot(nsISelection** aSel,
nsIContent** aRoot)
{
if (!sTextStateObserver || !sTextStateObserver->mEditableNode ||
!sTextStateObserver->mSel)
return NS_ERROR_NOT_AVAILABLE;
NS_ASSERTION(sTextStateObserver->mSel && sTextStateObserver->mRootContent,
"uninitialized text state observer");
NS_ADDREF(*aSel = sTextStateObserver->mSel);
NS_ADDREF(*aRoot = sTextStateObserver->mRootContent);
return NS_OK;
}
// static
already_AddRefed<TextComposition>
nsIMEStateManager::GetTextCompositionFor(nsIWidget* aWidget)
{
if (!sTextCompositions) {
return nullptr;
}
nsRefPtr<TextComposition> textComposition =
sTextCompositions->GetCompositionFor(aWidget);
return textComposition.forget();
}
// static
already_AddRefed<TextComposition>
nsIMEStateManager::GetTextCompositionFor(WidgetGUIEvent* aEvent)
{
MOZ_ASSERT(aEvent->AsCompositionEvent() || aEvent->AsTextEvent(),
"aEvent has to be WidgetCompositionEvent or WidgetTextEvent");
return GetTextCompositionFor(aEvent->widget);
}
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