зеркало из https://github.com/mozilla/gecko-dev.git
675 строки
26 KiB
C++
675 строки
26 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim:expandtab:shiftwidth=4:tabstop=4:
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*/
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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 IMContextWrapper_h_
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#define IMContextWrapper_h_
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#include <gdk/gdk.h>
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#include <gtk/gtk.h>
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#include "nsString.h"
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#include "nsCOMPtr.h"
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#include "nsTArray.h"
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#include "nsIWidget.h"
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#include "mozilla/CheckedInt.h"
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#include "mozilla/EventForwards.h"
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#include "mozilla/TextEventDispatcherListener.h"
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#include "WritingModes.h"
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class nsWindow;
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namespace mozilla {
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namespace widget {
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class IMContextWrapper final : public TextEventDispatcherListener
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{
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public:
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// TextEventDispatcherListener implementation
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NS_DECL_ISUPPORTS
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NS_IMETHOD NotifyIME(TextEventDispatcher* aTextEventDispatcher,
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const IMENotification& aNotification) override;
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NS_IMETHOD_(IMENotificationRequests) GetIMENotificationRequests() override;
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NS_IMETHOD_(void) OnRemovedFrom(
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TextEventDispatcher* aTextEventDispatcher) override;
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NS_IMETHOD_(void) WillDispatchKeyboardEvent(
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TextEventDispatcher* aTextEventDispatcher,
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WidgetKeyboardEvent& aKeyboardEvent,
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uint32_t aIndexOfKeypress,
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void* aData) override;
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public:
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// aOwnerWindow is a pointer of the owner window. When aOwnerWindow is
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// destroyed, the related IME contexts are released (i.e., IME cannot be
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// used with the instance after that).
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explicit IMContextWrapper(nsWindow* aOwnerWindow);
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// "Enabled" means the users can use all IMEs.
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// I.e., the focus is in the normal editors.
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bool IsEnabled() const;
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// OnFocusWindow is a notification that aWindow is going to be focused.
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void OnFocusWindow(nsWindow* aWindow);
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// OnBlurWindow is a notification that aWindow is going to be unfocused.
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void OnBlurWindow(nsWindow* aWindow);
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// OnDestroyWindow is a notification that aWindow is going to be destroyed.
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void OnDestroyWindow(nsWindow* aWindow);
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// OnFocusChangeInGecko is a notification that an editor gets focus.
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void OnFocusChangeInGecko(bool aFocus);
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// OnSelectionChange is a notification that selection (caret) is changed
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// in the focused editor.
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void OnSelectionChange(nsWindow* aCaller,
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const IMENotification& aIMENotification);
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/**
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* OnKeyEvent() is called when aWindow gets a native key press event or a
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* native key release event. If this returns true, the key event was
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* filtered by IME. Otherwise, this returns false.
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* NOTE: When the native key press event starts composition, this returns
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* true but dispatches an eKeyDown event or eKeyUp event before
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* dispatching composition events or content command event.
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*
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* @param aWindow A window on which user operate the
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* key.
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* @param aEvent A native key press or release
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* event.
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* @param aKeyboardEventWasDispatched true if eKeyDown or eKeyUp event
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* for aEvent has already been
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* dispatched. In this case,
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* this class doesn't dispatch
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* keyboard event anymore.
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*/
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bool OnKeyEvent(nsWindow* aWindow, GdkEventKey* aEvent,
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bool aKeyboardEventWasDispatched = false);
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// IME related nsIWidget methods.
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nsresult EndIMEComposition(nsWindow* aCaller);
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void SetInputContext(nsWindow* aCaller,
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const InputContext* aContext,
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const InputContextAction* aAction);
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InputContext GetInputContext();
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void OnUpdateComposition();
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void OnLayoutChange();
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TextEventDispatcher* GetTextEventDispatcher();
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// TODO: Typically, new IM comes every several years. And now, our code
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// becomes really IM behavior dependent. So, perhaps, we need prefs
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// to control related flags for IM developers.
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enum class IMContextID : uint8_t
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{
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eFcitx,
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eIBus,
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eIIIMF,
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eScim,
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eUim,
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eUnknown,
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};
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static const char* GetIMContextIDName(IMContextID aIMContextID)
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{
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switch (aIMContextID) {
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case IMContextID::eFcitx:
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return "eFcitx";
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case IMContextID::eIBus:
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return "eIBus";
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case IMContextID::eIIIMF:
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return "eIIIMF";
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case IMContextID::eScim:
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return "eScim";
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case IMContextID::eUim:
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return "eUim";
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default:
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return "eUnknown";
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}
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}
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protected:
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~IMContextWrapper();
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// Owner of an instance of this class. This should be top level window.
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// The owner window must release the contexts when it's destroyed because
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// the IME contexts need the native window. If OnDestroyWindow() is called
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// with the owner window, it'll release IME contexts. Otherwise, it'll
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// just clean up any existing composition if it's related to the destroying
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// child window.
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nsWindow* mOwnerWindow;
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// A last focused window in this class's context.
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nsWindow* mLastFocusedWindow;
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// Actual context. This is used for handling the user's input.
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GtkIMContext* mContext;
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// mSimpleContext is used for the password field and
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// the |ime-mode: disabled;| editors if sUseSimpleContext is true.
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// These editors disable IME. But dead keys should work. Fortunately,
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// the simple IM context of GTK2 support only them.
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GtkIMContext* mSimpleContext;
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// mDummyContext is a dummy context and will be used in Focus()
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// when the state of mEnabled means disabled. This context's IME state is
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// always "closed", so it closes IME forcedly.
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GtkIMContext* mDummyContext;
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// mComposingContext is not nullptr while one of mContext, mSimpleContext
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// and mDummyContext has composition.
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// XXX: We don't assume that two or more context have composition same time.
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GtkIMContext* mComposingContext;
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// IME enabled state and other things defined in InputContext.
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// Use following helper methods if you don't need the detail of the status.
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InputContext mInputContext;
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// mCompositionStart is the start offset of the composition string in the
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// current content. When <textarea> or <input> have focus, it means offset
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// from the first character of them. When a HTML editor has focus, it
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// means offset from the first character of the root element of the editor.
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uint32_t mCompositionStart;
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// mDispatchedCompositionString is the latest composition string which
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// was dispatched by compositionupdate event.
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nsString mDispatchedCompositionString;
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// mSelectedStringRemovedByComposition is the selected string which was
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// removed by first compositionchange event.
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nsString mSelectedStringRemovedByComposition;
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// OnKeyEvent() temporarily sets mProcessingKeyEvent to the given native
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// event.
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GdkEventKey* mProcessingKeyEvent;
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/**
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* GdkEventKeyQueue stores *copy* of GdkEventKey instances. However, this
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* must be safe to our usecase since it has |time| and the value should not
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* be same as older event.
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*/
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class GdkEventKeyQueue final
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{
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public:
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~GdkEventKeyQueue() { Clear(); }
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void Clear()
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{
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if (!mEvents.IsEmpty()) {
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RemoveEventsAt(0, mEvents.Length());
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}
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}
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/**
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* PutEvent() puts new event into the queue.
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*/
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void PutEvent(const GdkEventKey* aEvent)
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{
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GdkEventKey* newEvent =
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reinterpret_cast<GdkEventKey*>(
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gdk_event_copy(reinterpret_cast<const GdkEvent*>(aEvent)));
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newEvent->state &= GDK_MODIFIER_MASK;
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mEvents.AppendElement(newEvent);
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}
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/**
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* RemoveEvent() removes oldest same event and its preceding events
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* from the queue.
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*/
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void RemoveEvent(const GdkEventKey* aEvent)
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{
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size_t index = IndexOf(aEvent);
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if (NS_WARN_IF(index == mEvents.NoIndex)) {
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return;
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}
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RemoveEventsAt(0, index + 1);
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}
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/**
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* FirstEvent() returns oldest event in the queue.
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*/
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GdkEventKey* GetFirstEvent() const
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{
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if (mEvents.IsEmpty()) {
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return nullptr;
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}
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return mEvents[0];
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}
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bool IsEmpty() const { return mEvents.IsEmpty(); }
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private:
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nsTArray<GdkEventKey*> mEvents;
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void RemoveEventsAt(size_t aStart, size_t aCount)
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{
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for (size_t i = aStart; i < aStart + aCount; i++) {
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gdk_event_free(reinterpret_cast<GdkEvent*>(mEvents[i]));
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}
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mEvents.RemoveElementsAt(aStart, aCount);
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}
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size_t IndexOf(const GdkEventKey* aEvent) const
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{
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static_assert(!(GDK_MODIFIER_MASK & (1 << 24)),
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"We assumes 25th bit is used by some IM, but used by GDK");
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static_assert(!(GDK_MODIFIER_MASK & (1 << 25)),
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"We assumes 26th bit is used by some IM, but used by GDK");
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for (size_t i = 0; i < mEvents.Length(); i++) {
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GdkEventKey* event = mEvents[i];
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// It must be enough to compare only type, time, keyval and
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// part of state. Note that we cannot compaire two events
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// simply since IME may have changed unused bits of state.
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if (event->time == aEvent->time) {
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if (NS_WARN_IF(event->type != aEvent->type) ||
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NS_WARN_IF(event->keyval != aEvent->keyval) ||
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NS_WARN_IF(event->state !=
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(aEvent->state & GDK_MODIFIER_MASK))) {
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continue;
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}
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}
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return i;
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}
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return mEvents.NoIndex;
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}
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};
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// OnKeyEvent() append mPostingKeyEvents when it believes that a key event
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// is posted to other IME process.
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GdkEventKeyQueue mPostingKeyEvents;
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struct Range
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{
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uint32_t mOffset;
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uint32_t mLength;
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Range()
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: mOffset(UINT32_MAX)
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, mLength(UINT32_MAX)
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{
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}
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bool IsValid() const { return mOffset != UINT32_MAX; }
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void Clear()
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{
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mOffset = UINT32_MAX;
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mLength = UINT32_MAX;
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}
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};
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// current target offset and length of IME composition
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Range mCompositionTargetRange;
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// mCompositionState indicates current status of composition.
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enum eCompositionState : uint8_t
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{
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eCompositionState_NotComposing,
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eCompositionState_CompositionStartDispatched,
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eCompositionState_CompositionChangeEventDispatched
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};
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eCompositionState mCompositionState;
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bool IsComposing() const
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{
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return (mCompositionState != eCompositionState_NotComposing);
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}
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bool IsComposingOn(GtkIMContext* aContext) const
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{
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return IsComposing() && mComposingContext == aContext;
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}
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bool IsComposingOnCurrentContext() const
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{
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return IsComposingOn(GetCurrentContext());
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}
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bool EditorHasCompositionString()
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{
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return (mCompositionState ==
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eCompositionState_CompositionChangeEventDispatched);
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}
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/**
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* Checks if aContext is valid context for handling composition.
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*
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* @param aContext An IM context which is specified by native
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* composition events.
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* @return true if the context is valid context for
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* handling composition. Otherwise, false.
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*/
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bool IsValidContext(GtkIMContext* aContext) const;
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const char* GetCompositionStateName()
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{
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switch (mCompositionState) {
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case eCompositionState_NotComposing:
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return "NotComposing";
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case eCompositionState_CompositionStartDispatched:
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return "CompositionStartDispatched";
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case eCompositionState_CompositionChangeEventDispatched:
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return "CompositionChangeEventDispatched";
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default:
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return "InvaildState";
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}
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}
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// mIMContextID indicates the ID of mContext. This is actually indicates
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// IM which user selected.
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IMContextID mIMContextID;
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struct Selection final
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{
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nsString mString;
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uint32_t mOffset;
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WritingMode mWritingMode;
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Selection()
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: mOffset(UINT32_MAX)
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{
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}
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void Clear()
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{
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mString.Truncate();
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mOffset = UINT32_MAX;
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mWritingMode = WritingMode();
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}
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void CollapseTo(uint32_t aOffset,
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const WritingMode& aWritingMode)
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{
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mWritingMode = aWritingMode;
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mOffset = aOffset;
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mString.Truncate();
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}
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void Assign(const IMENotification& aIMENotification);
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void Assign(const WidgetQueryContentEvent& aSelectedTextEvent);
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bool IsValid() const { return mOffset != UINT32_MAX; }
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bool Collapsed() const { return mString.IsEmpty(); }
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uint32_t Length() const { return mString.Length(); }
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uint32_t EndOffset() const
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{
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if (NS_WARN_IF(!IsValid())) {
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return UINT32_MAX;
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}
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CheckedInt<uint32_t> endOffset =
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CheckedInt<uint32_t>(mOffset) + mString.Length();
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if (NS_WARN_IF(!endOffset.isValid())) {
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return UINT32_MAX;
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}
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return endOffset.value();
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}
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} mSelection;
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bool EnsureToCacheSelection(nsAString* aSelectedString = nullptr);
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// mIsIMFocused is set to TRUE when we call gtk_im_context_focus_in(). And
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// it's set to FALSE when we call gtk_im_context_focus_out().
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bool mIsIMFocused;
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// mFallbackToKeyEvent is set to false when this class starts to handle
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// a native key event (at that time, mProcessingKeyEvent is set to the
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// native event). If active IME just commits composition with a character
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// which is produced by the key with current keyboard layout, this is set
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// to true.
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bool mFallbackToKeyEvent;
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// mKeyboardEventWasDispatched is used by OnKeyEvent() and
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// MaybeDispatchKeyEventAsProcessedByIME().
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// MaybeDispatchKeyEventAsProcessedByIME() dispatches an eKeyDown or
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// eKeyUp event event if the composition is caused by a native
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// key press event. If this is true, a keyboard event has been dispatched
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// for the native event. If so, MaybeDispatchKeyEventAsProcessedByIME()
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// won't dispatch keyboard event anymore.
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bool mKeyboardEventWasDispatched;
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// mIsDeletingSurrounding is true while OnDeleteSurroundingNative() is
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// trying to delete the surrounding text.
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bool mIsDeletingSurrounding;
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// mLayoutChanged is true after OnLayoutChange() is called. This is reset
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// when eCompositionChange is being dispatched.
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bool mLayoutChanged;
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// mSetCursorPositionOnKeyEvent true when caret rect or position is updated
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// with no composition. If true, we update candidate window position
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// before key down
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bool mSetCursorPositionOnKeyEvent;
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// mPendingResettingIMContext becomes true if selection change notification
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// is received during composition but the selection change occurred before
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// starting the composition. In such case, we cannot notify IME of
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// selection change during composition because we don't want to commit
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// the composition in such case. However, we should notify IME of the
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// selection change after the composition is committed.
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bool mPendingResettingIMContext;
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// mRetrieveSurroundingSignalReceived is true after "retrieve_surrounding"
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// signal is received until selection is changed in Gecko.
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bool mRetrieveSurroundingSignalReceived;
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// mMaybeInDeadKeySequence is set to true when we detect a dead key press
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// and set to false when we're sure dead key sequence has been finished.
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// Note that we cannot detect which key event causes ending a dead key
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// sequence. For example, when you press dead key grave with ibus Spanish
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// keyboard layout, it just consumes the key event when we call
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// gtk_im_context_filter_keypress(). Then, pressing "Escape" key cancels
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// the dead key sequence but we don't receive any signal and it's consumed
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// by gtk_im_context_filter_keypress() normally. On the other hand, when
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// pressing "Shift" key causes exactly same behavior but dead key sequence
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// isn't finished yet.
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bool mMaybeInDeadKeySequence;
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// mIsIMInAsyncKeyHandlingMode is set to true if we know that IM handles
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// key events asynchronously. I.e., filtered key event may come again
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// later.
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bool mIsIMInAsyncKeyHandlingMode;
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// mIsKeySnooped is set to true if IM uses key snooper to listen key events.
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// In such case, we won't receive key events if IME consumes the event.
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bool mIsKeySnooped;
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// sLastFocusedContext is a pointer to the last focused instance of this
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// class. When a instance is destroyed and sLastFocusedContext refers it,
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// this is cleared. So, this refers valid pointer always.
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static IMContextWrapper* sLastFocusedContext;
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// sUseSimpleContext indeicates if password editors and editors with
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// |ime-mode: disabled;| should use GtkIMContextSimple.
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// If true, they use GtkIMContextSimple. Otherwise, not.
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static bool sUseSimpleContext;
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// Callback methods for native IME events. These methods should call
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// the related instance methods simply.
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static gboolean OnRetrieveSurroundingCallback(GtkIMContext* aContext,
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IMContextWrapper* aModule);
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static gboolean OnDeleteSurroundingCallback(GtkIMContext* aContext,
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gint aOffset,
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gint aNChars,
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IMContextWrapper* aModule);
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static void OnCommitCompositionCallback(GtkIMContext* aContext,
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const gchar* aString,
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IMContextWrapper* aModule);
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static void OnChangeCompositionCallback(GtkIMContext* aContext,
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IMContextWrapper* aModule);
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static void OnStartCompositionCallback(GtkIMContext* aContext,
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IMContextWrapper* aModule);
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static void OnEndCompositionCallback(GtkIMContext* aContext,
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IMContextWrapper* aModule);
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// The instance methods for the native IME events.
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gboolean OnRetrieveSurroundingNative(GtkIMContext* aContext);
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gboolean OnDeleteSurroundingNative(GtkIMContext* aContext,
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gint aOffset,
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gint aNChars);
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void OnCommitCompositionNative(GtkIMContext* aContext,
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const gchar* aString);
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void OnChangeCompositionNative(GtkIMContext* aContext);
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void OnStartCompositionNative(GtkIMContext* aContext);
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void OnEndCompositionNative(GtkIMContext* aContext);
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/**
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* GetCurrentContext() returns current IM context which is chosen with the
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* enabled state.
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* WARNING:
|
|
* When this class receives some signals for a composition after focus
|
|
* is moved in Gecko, the result of this may be different from given
|
|
* context by the signals.
|
|
*/
|
|
GtkIMContext* GetCurrentContext() const;
|
|
|
|
/**
|
|
* GetActiveContext() returns a composing context or current context.
|
|
*/
|
|
GtkIMContext* GetActiveContext() const
|
|
{
|
|
return mComposingContext ? mComposingContext : GetCurrentContext();
|
|
}
|
|
|
|
// If the owner window and IM context have been destroyed, returns TRUE.
|
|
bool IsDestroyed() { return !mOwnerWindow; }
|
|
|
|
// Sets focus to the instance of this class.
|
|
void Focus();
|
|
|
|
// Steals focus from the instance of this class.
|
|
void Blur();
|
|
|
|
// Initializes the instance.
|
|
void Init();
|
|
|
|
/**
|
|
* Reset the active context, i.e., if there is mComposingContext, reset it.
|
|
* Otherwise, reset current context. Note that all native composition
|
|
* events during calling this will be ignored.
|
|
*/
|
|
void ResetIME();
|
|
|
|
// Gets the current composition string by the native APIs.
|
|
void GetCompositionString(GtkIMContext* aContext,
|
|
nsAString& aCompositionString);
|
|
|
|
/**
|
|
* Generates our text range array from current composition string.
|
|
*
|
|
* @param aContext A GtkIMContext which is being handled.
|
|
* @param aCompositionString The data to be dispatched with
|
|
* compositionchange event.
|
|
*/
|
|
already_AddRefed<TextRangeArray>
|
|
CreateTextRangeArray(GtkIMContext* aContext,
|
|
const nsAString& aCompositionString);
|
|
|
|
/**
|
|
* SetTextRange() initializes aTextRange with aPangoAttrIter.
|
|
*
|
|
* @param aPangoAttrIter An iter which represents a clause of the
|
|
* composition string.
|
|
* @param aUTF8CompositionString The whole composition string (UTF-8).
|
|
* @param aUTF16CaretOffset The caret offset in the composition
|
|
* string encoded as UTF-16.
|
|
* @param aTextRange The result.
|
|
* @return true if this initializes aTextRange.
|
|
* Otherwise, false.
|
|
*/
|
|
bool SetTextRange(PangoAttrIterator* aPangoAttrIter,
|
|
const gchar* aUTF8CompositionString,
|
|
uint32_t aUTF16CaretOffset,
|
|
TextRange& aTextRange) const;
|
|
|
|
/**
|
|
* ToNscolor() converts the PangoColor in aPangoAttrColor to nscolor.
|
|
*/
|
|
static nscolor ToNscolor(PangoAttrColor* aPangoAttrColor);
|
|
|
|
/**
|
|
* Move the candidate window with "fake" cursor position.
|
|
*
|
|
* @param aContext A GtkIMContext which is being handled.
|
|
*/
|
|
void SetCursorPosition(GtkIMContext* aContext);
|
|
|
|
// Queries the current selection offset of the window.
|
|
uint32_t GetSelectionOffset(nsWindow* aWindow);
|
|
|
|
// Get current paragraph text content and cursor position
|
|
nsresult GetCurrentParagraph(nsAString& aText, uint32_t& aCursorPos);
|
|
|
|
/**
|
|
* Delete text portion
|
|
*
|
|
* @param aContext A GtkIMContext which is being handled.
|
|
* @param aOffset Start offset of the range to delete.
|
|
* @param aNChars Count of characters to delete. It depends
|
|
* on |g_utf8_strlen()| what is one character.
|
|
*/
|
|
nsresult DeleteText(GtkIMContext* aContext,
|
|
int32_t aOffset,
|
|
uint32_t aNChars);
|
|
|
|
// Initializes the GUI event.
|
|
void InitEvent(WidgetGUIEvent& aEvent);
|
|
|
|
// Called before destroying the context to work around some platform bugs.
|
|
void PrepareToDestroyContext(GtkIMContext* aContext);
|
|
|
|
/**
|
|
* WARNING:
|
|
* Following methods dispatch gecko events. Then, the focused widget
|
|
* can be destroyed, and also it can be stolen focus. If they returns
|
|
* FALSE, callers cannot continue the composition.
|
|
* - MaybeDispatchKeyEventAsProcessedByIME
|
|
* - DispatchCompositionStart
|
|
* - DispatchCompositionChangeEvent
|
|
* - DispatchCompositionCommitEvent
|
|
*/
|
|
|
|
/**
|
|
* Dispatch an eKeyDown or eKeyUp event whose mKeyCode value is
|
|
* NS_VK_PROCESSKEY and mKeyNameIndex is KEY_NAME_INDEX_Process if
|
|
* we're not in a dead key sequence, mProcessingKeyEvent is nullptr
|
|
* but mPostingKeyEvents is not empty or mProcessingKeyEvent is not
|
|
* nullptr and mKeyboardEventWasDispatched is still false. If this
|
|
* dispatches a keyboard event, this sets mKeyboardEventWasDispatched
|
|
* to true.
|
|
*
|
|
* @param aFollowingEvent The following event message.
|
|
* @return If the caller can continue to handle
|
|
* composition, returns true. Otherwise,
|
|
* false. For example, if focus is moved
|
|
* by dispatched keyboard event, returns
|
|
* false.
|
|
*/
|
|
bool MaybeDispatchKeyEventAsProcessedByIME(EventMessage aFollowingEvent);
|
|
|
|
/**
|
|
* Dispatches a composition start event.
|
|
*
|
|
* @param aContext A GtkIMContext which is being handled.
|
|
* @return true if the focused widget is neither
|
|
* destroyed nor changed. Otherwise, false.
|
|
*/
|
|
bool DispatchCompositionStart(GtkIMContext* aContext);
|
|
|
|
/**
|
|
* Dispatches a compositionchange event.
|
|
*
|
|
* @param aContext A GtkIMContext which is being handled.
|
|
* @param aCompositionString New composition string.
|
|
* @return true if the focused widget is neither
|
|
* destroyed nor changed. Otherwise, false.
|
|
*/
|
|
bool DispatchCompositionChangeEvent(GtkIMContext* aContext,
|
|
const nsAString& aCompositionString);
|
|
|
|
/**
|
|
* Dispatches a compositioncommit event or compositioncommitasis event.
|
|
*
|
|
* @param aContext A GtkIMContext which is being handled.
|
|
* @param aCommitString If this is nullptr, the composition will
|
|
* be committed with last dispatched data.
|
|
* Otherwise, the composition will be
|
|
* committed with this value.
|
|
* @return true if the focused widget is neither
|
|
* destroyed nor changed. Otherwise, false.
|
|
*/
|
|
bool DispatchCompositionCommitEvent(
|
|
GtkIMContext* aContext,
|
|
const nsAString* aCommitString = nullptr);
|
|
};
|
|
|
|
} // namespace widget
|
|
} // namespace mozilla
|
|
|
|
#endif // #ifndef IMContextWrapper_h_
|