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265 lines
10 KiB
C++
265 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_IMEStateManager_h_
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#define mozilla_IMEStateManager_h_
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#include "mozilla/EventForwards.h"
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#include "mozilla/StaticPtr.h"
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#include "mozilla/dom/TabParent.h"
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#include "nsIWidget.h"
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class nsIContent;
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class nsIDOMMouseEvent;
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class nsIEditor;
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class nsINode;
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class nsPresContext;
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class nsISelection;
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namespace mozilla {
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class EventDispatchingCallback;
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class IMEContentObserver;
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class TextCompositionArray;
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class TextComposition;
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/**
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* IMEStateManager manages InputContext (e.g., active editor type, IME enabled
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* state and IME open state) of nsIWidget instances, manages IMEContentObserver
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* and provides useful API for IME.
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*/
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class IMEStateManager
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{
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typedef dom::TabParent TabParent;
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typedef widget::IMEMessage IMEMessage;
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typedef widget::IMENotification IMENotification;
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typedef widget::IMEState IMEState;
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typedef widget::InputContext InputContext;
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typedef widget::InputContextAction InputContextAction;
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public:
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static void Init();
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static void Shutdown();
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/**
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* GetActiveTabParent() returns a pointer to a TabParent instance which is
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* managed by the focused content (sContent). If the focused content isn't
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* managing another process, this returns nullptr.
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*/
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static TabParent* GetActiveTabParent()
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{
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// If menu has pseudo focus, we should ignore active child process.
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if (sInstalledMenuKeyboardListener) {
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return nullptr;
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}
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return sActiveTabParent.get();
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}
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/**
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* OnTabParentDestroying() is called when aTabParent is being destroyed.
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*/
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static void OnTabParentDestroying(TabParent* aTabParent);
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/**
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* SetIMEContextForChildProcess() is called when aTabParent receives
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* SetInputContext() from the remote process.
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*/
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static void SetInputContextForChildProcess(TabParent* aTabParent,
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const InputContext& aInputContext,
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const InputContextAction& aAction);
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/**
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* StopIMEStateManagement() is called when the process should stop managing
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* IME state.
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*/
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static void StopIMEStateManagement();
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static nsresult OnDestroyPresContext(nsPresContext* aPresContext);
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static nsresult OnRemoveContent(nsPresContext* aPresContext,
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nsIContent* aContent);
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/**
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* OnChangeFocus() should be called when focused content is changed or
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* IME enabled state is changed. If nobody has focus, set both aPresContext
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* and aContent nullptr. E.g., all windows are deactivated.
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*/
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static nsresult OnChangeFocus(nsPresContext* aPresContext,
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nsIContent* aContent,
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InputContextAction::Cause aCause);
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static void OnInstalledMenuKeyboardListener(bool aInstalling);
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// These two methods manage focus and selection/text observers.
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// They are separate from OnChangeFocus above because this offers finer
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// control compared to having the two methods incorporated into OnChangeFocus
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// Get the focused editor's selection and root
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static nsresult GetFocusSelectionAndRoot(nsISelection** aSel,
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nsIContent** aRoot);
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// This method updates the current IME state. However, if the enabled state
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// isn't changed by the new state, this method does nothing.
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// Note that this method changes the IME state of the active element in the
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// widget. So, the caller must have focus.
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static void UpdateIMEState(const IMEState &aNewIMEState,
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nsIContent* aContent,
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nsIEditor* aEditor);
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// This method is called when user operates mouse button in focused editor
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// and before the editor handles it.
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// Returns true if IME consumes the event. Otherwise, false.
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static bool OnMouseButtonEventInEditor(nsPresContext* aPresContext,
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nsIContent* aContent,
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nsIDOMMouseEvent* aMouseEvent);
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// This method is called when user clicked in an editor.
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// aContent must be:
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// If the editor is for <input> or <textarea>, the element.
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// If the editor is for contenteditable, the active editinghost.
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// If the editor is for designMode, nullptr.
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static void OnClickInEditor(nsPresContext* aPresContext,
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nsIContent* aContent,
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nsIDOMMouseEvent* aMouseEvent);
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// This method is called when editor actually gets focus.
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// aContent must be:
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// If the editor is for <input> or <textarea>, the element.
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// If the editor is for contenteditable, the active editinghost.
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// If the editor is for designMode, nullptr.
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static void OnFocusInEditor(nsPresContext* aPresContext,
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nsIContent* aContent,
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nsIEditor* aEditor);
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// This method is called when the editor is initialized.
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static void OnEditorInitialized(nsIEditor* aEditor);
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// This method is called when the editor is (might be temporarily) being
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// destroyed.
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static void OnEditorDestroying(nsIEditor* aEditor);
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/**
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* All composition events must be dispatched via DispatchCompositionEvent()
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* for storing the composition target and ensuring a set of composition
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* events must be fired the stored target. If the stored composition event
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* target is destroying, this removes the stored composition automatically.
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*/
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static void DispatchCompositionEvent(
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nsINode* aEventTargetNode,
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nsPresContext* aPresContext,
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WidgetCompositionEvent* aCompositionEvent,
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nsEventStatus* aStatus,
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EventDispatchingCallback* aCallBack,
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bool aIsSynthesized = false);
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/**
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* All selection events must be handled via HandleSelectionEvent()
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* because they must be handled by same target as composition events when
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* there is a composition.
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*/
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static void HandleSelectionEvent(nsPresContext* aPresContext,
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nsIContent* aEventTargetContent,
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WidgetSelectionEvent* aSelectionEvent);
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/**
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* This is called when PresShell ignores a composition event due to not safe
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* to dispatch events.
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*/
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static void OnCompositionEventDiscarded(
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WidgetCompositionEvent* aCompositionEvent);
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/**
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* Get TextComposition from widget.
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*/
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static already_AddRefed<TextComposition>
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GetTextCompositionFor(nsIWidget* aWidget);
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/**
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* Returns TextComposition instance for the event.
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*
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* @param aGUIEvent Should be a composition event which is being dispatched.
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*/
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static already_AddRefed<TextComposition>
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GetTextCompositionFor(WidgetGUIEvent* aGUIEvent);
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/**
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* Send a notification to IME. It depends on the IME or platform spec what
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* will occur (or not occur).
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*/
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static nsresult NotifyIME(const IMENotification& aNotification,
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nsIWidget* aWidget,
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bool aOriginIsRemote = false);
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static nsresult NotifyIME(IMEMessage aMessage,
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nsIWidget* aWidget,
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bool aOriginIsRemote = false);
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static nsresult NotifyIME(IMEMessage aMessage,
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nsPresContext* aPresContext,
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bool aOriginIsRemote = false);
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static nsINode* GetRootEditableNode(nsPresContext* aPresContext,
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nsIContent* aContent);
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protected:
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static nsresult OnChangeFocusInternal(nsPresContext* aPresContext,
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nsIContent* aContent,
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InputContextAction aAction);
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static void SetIMEState(const IMEState &aState,
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nsIContent* aContent,
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nsIWidget* aWidget,
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InputContextAction aAction);
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static void SetInputContext(nsIWidget* aWidget,
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const InputContext& aInputContext,
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const InputContextAction& aAction);
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static IMEState GetNewIMEState(nsPresContext* aPresContext,
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nsIContent* aContent);
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static void EnsureTextCompositionArray();
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static void CreateIMEContentObserver(nsIEditor* aEditor);
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static void DestroyIMEContentObserver();
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static bool IsEditable(nsINode* node);
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static bool IsIMEObserverNeeded(const IMEState& aState);
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static nsIContent* GetRootContent(nsPresContext* aPresContext);
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static StaticRefPtr<nsIContent> sContent;
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static nsPresContext* sPresContext;
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static StaticRefPtr<nsIWidget> sFocusedIMEWidget;
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static StaticRefPtr<TabParent> sActiveTabParent;
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// sActiveIMEContentObserver points to the currently active
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// IMEContentObserver. This is null if there is no focused editor.
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static StaticRefPtr<IMEContentObserver> sActiveIMEContentObserver;
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// All active compositions in the process are stored by this array.
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// When you get an item of this array and use it, please be careful.
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// The instances in this array can be destroyed automatically if you do
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// something to cause committing or canceling the composition.
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static TextCompositionArray* sTextCompositions;
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static bool sInstalledMenuKeyboardListener;
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static bool sIsGettingNewIMEState;
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static bool sCheckForIMEUnawareWebApps;
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static bool sRemoteHasFocus;
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class MOZ_STACK_CLASS GettingNewIMEStateBlocker final
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{
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public:
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GettingNewIMEStateBlocker()
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: mOldValue(IMEStateManager::sIsGettingNewIMEState)
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{
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IMEStateManager::sIsGettingNewIMEState = true;
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}
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~GettingNewIMEStateBlocker()
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{
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IMEStateManager::sIsGettingNewIMEState = mOldValue;
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}
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private:
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bool mOldValue;
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};
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};
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} // namespace mozilla
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#endif // mozilla_IMEStateManager_h_
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