465 lines
18 KiB
C++
465 lines
18 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 "nsAutoPtr.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 "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
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{
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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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NS_INLINE_DECL_REFCOUNTING(IMContextWrapper)
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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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nsIMEUpdatePreference GetIMEUpdatePreference() 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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// 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 keypress event starts composition, this returns TRUE but
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// this dispatches keydown event before compositionstart event.
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bool OnKeyEvent(nsWindow* aWindow, GdkEventKey* aEvent,
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bool aKeyDownEventWasSent = 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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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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// mSelectedString is the selected string which was removed by first
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// compositionchange event.
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nsString mSelectedString;
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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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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 {
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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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struct Selection final
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{
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uint32_t mOffset;
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uint32_t mLength;
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WritingMode mWritingMode;
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Selection()
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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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void Clear()
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{
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mOffset = UINT32_MAX;
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mLength = UINT32_MAX;
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mWritingMode = WritingMode();
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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 !mLength; }
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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) + mLength;
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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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// mFilterKeyEvent is used by OnKeyEvent(). If the commit event should
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// be processed as simple key event, this is set to TRUE by the commit
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// handler.
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bool mFilterKeyEvent;
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// mKeyDownEventWasSent is used by OnKeyEvent() and
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// DispatchCompositionStart(). DispatchCompositionStart() dispatches
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// a keydown event if the composition start is caused by a native
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// keypress event. If this is true, the keydown event has been dispatched.
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// Then, DispatchCompositionStart() doesn't dispatch keydown event.
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bool mKeyDownEventWasSent;
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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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// 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:
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* When this class receives some signals for a composition after focus
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* is moved in Gecko, the result of this may be different from given
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* context by the signals.
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*/
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GtkIMContext* GetCurrentContext() const;
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/**
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* GetActiveContext() returns a composing context or current context.
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*/
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GtkIMContext* GetActiveContext() const
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{
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return mComposingContext ? mComposingContext : GetCurrentContext();
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}
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// If the owner window and IM context have been destroyed, returns TRUE.
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bool IsDestroyed() { return !mOwnerWindow; }
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// Sets focus to the instance of this class.
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void Focus();
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// Steals focus from the instance of this class.
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void Blur();
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// Initializes the instance.
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void Init();
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// Reset the current composition of IME. All native composition events
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// during this processing are ignored.
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void ResetIME();
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// Gets the current composition string by the native APIs.
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void GetCompositionString(GtkIMContext* aContext,
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nsAString& aCompositionString);
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/**
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* Generates our text range array from current composition string.
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*
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* @param aContext A GtkIMContext which is being handled.
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* @param aCompositionString The data to be dispatched with
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* compositionchange event.
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*/
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already_AddRefed<TextRangeArray>
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CreateTextRangeArray(GtkIMContext* aContext,
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const nsAString& aCompositionString);
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/**
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* SetTextRange() initializes aTextRange with aPangoAttrIter.
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*
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* @param aPangoAttrIter An iter which represents a clause of the
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* composition string.
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* @param aUTF8CompositionString The whole composition string (UTF-8).
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* @param aUTF16CaretOffset The caret offset in the composition
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* string encoded as UTF-16.
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* @param aTextRange The result.
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* @return true if this initializes aTextRange.
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* Otherwise, false.
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*/
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bool SetTextRange(PangoAttrIterator* aPangoAttrIter,
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const gchar* aUTF8CompositionString,
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uint32_t aUTF16CaretOffset,
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TextRange& aTextRange) const;
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/**
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* ToNscolor() converts the PangoColor in aPangoAttrColor to nscolor.
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*/
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static nscolor ToNscolor(PangoAttrColor* aPangoAttrColor);
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/**
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* Move the candidate window with "fake" cursor position.
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*
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* @param aContext A GtkIMContext which is being handled.
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*/
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void SetCursorPosition(GtkIMContext* aContext);
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// Queries the current selection offset of the window.
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uint32_t GetSelectionOffset(nsWindow* aWindow);
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// Get current paragraph text content and cursor position
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nsresult GetCurrentParagraph(nsAString& aText, uint32_t& aCursorPos);
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/**
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* Delete text portion
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*
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* @param aContext A GtkIMContext which is being handled.
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* @param aOffset Start offset of the range to delete.
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* @param aNChars Count of characters to delete. It depends
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* on |g_utf8_strlen()| what is one character.
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*/
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nsresult DeleteText(GtkIMContext* aContext,
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int32_t aOffset,
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uint32_t aNChars);
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// Initializes the GUI event.
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void InitEvent(WidgetGUIEvent& aEvent);
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// Called before destroying the context to work around some platform bugs.
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void PrepareToDestroyContext(GtkIMContext* aContext);
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/**
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* WARNING:
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* Following methods dispatch gecko events. Then, the focused widget
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* can be destroyed, and also it can be stolen focus. If they returns
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* FALSE, callers cannot continue the composition.
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* - DispatchCompositionStart
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* - DispatchCompositionChangeEvent
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* - DispatchCompositionCommitEvent
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*/
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/**
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* Dispatches a composition start event.
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*
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* @param aContext A GtkIMContext which is being handled.
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* @return true if the focused widget is neither
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* destroyed nor changed. Otherwise, false.
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*/
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bool DispatchCompositionStart(GtkIMContext* aContext);
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/**
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* Dispatches a compositionchange event.
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*
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* @param aContext A GtkIMContext which is being handled.
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* @param aCompositionString New composition string.
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* @return true if the focused widget is neither
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* destroyed nor changed. Otherwise, false.
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*/
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bool DispatchCompositionChangeEvent(GtkIMContext* aContext,
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const nsAString& aCompositionString);
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/**
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* Dispatches a compositioncommit event or compositioncommitasis event.
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*
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* @param aContext A GtkIMContext which is being handled.
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* @param aCommitString If this is nullptr, the composition will
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* be committed with last dispatched data.
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* Otherwise, the composition will be
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* committed with this value.
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* @return true if the focused widget is neither
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* destroyed nor changed. Otherwise, false.
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*/
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bool DispatchCompositionCommitEvent(
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GtkIMContext* aContext,
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const nsAString* aCommitString = nullptr);
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};
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} // namespace widget
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} // namespace mozilla
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#endif // #ifndef IMContextWrapper_h_
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