gecko-dev/widget/gtk/IMContextWrapper.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim:expandtab:shiftwidth=4:tabstop=4:
*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef IMContextWrapper_h_
#define IMContextWrapper_h_
#include <gdk/gdk.h>
#include <gtk/gtk.h>
#include "nsString.h"
#include "nsCOMPtr.h"
#include "nsTArray.h"
#include "nsIWidget.h"
#include "mozilla/CheckedInt.h"
#include "mozilla/EventForwards.h"
#include "mozilla/TextEventDispatcherListener.h"
#include "WritingModes.h"
class nsWindow;
namespace mozilla {
namespace widget {
class IMContextWrapper final : public TextEventDispatcherListener
{
public:
// TextEventDispatcherListener implementation
NS_DECL_ISUPPORTS
NS_IMETHOD NotifyIME(TextEventDispatcher* aTextEventDispatcher,
const IMENotification& aNotification) override;
NS_IMETHOD_(nsIMEUpdatePreference) GetIMEUpdatePreference() override;
NS_IMETHOD_(void) OnRemovedFrom(
TextEventDispatcher* aTextEventDispatcher) override;
NS_IMETHOD_(void) WillDispatchKeyboardEvent(
TextEventDispatcher* aTextEventDispatcher,
WidgetKeyboardEvent& aKeyboardEvent,
uint32_t aIndexOfKeypress,
void* aData) override;
public:
// aOwnerWindow is a pointer of the owner window. When aOwnerWindow is
// destroyed, the related IME contexts are released (i.e., IME cannot be
// used with the instance after that).
explicit IMContextWrapper(nsWindow* aOwnerWindow);
// "Enabled" means the users can use all IMEs.
// I.e., the focus is in the normal editors.
bool IsEnabled() const;
// OnFocusWindow is a notification that aWindow is going to be focused.
void OnFocusWindow(nsWindow* aWindow);
// OnBlurWindow is a notification that aWindow is going to be unfocused.
void OnBlurWindow(nsWindow* aWindow);
// OnDestroyWindow is a notification that aWindow is going to be destroyed.
void OnDestroyWindow(nsWindow* aWindow);
// OnFocusChangeInGecko is a notification that an editor gets focus.
void OnFocusChangeInGecko(bool aFocus);
// OnSelectionChange is a notification that selection (caret) is changed
// in the focused editor.
void OnSelectionChange(nsWindow* aCaller,
const IMENotification& aIMENotification);
// OnKeyEvent is called when aWindow gets a native key press event or a
// native key release event. If this returns TRUE, the key event was
// filtered by IME. Otherwise, this returns FALSE.
// NOTE: When the keypress event starts composition, this returns TRUE but
// this dispatches keydown event before compositionstart event.
bool OnKeyEvent(nsWindow* aWindow, GdkEventKey* aEvent,
bool aKeyDownEventWasSent = false);
// IME related nsIWidget methods.
nsresult EndIMEComposition(nsWindow* aCaller);
void SetInputContext(nsWindow* aCaller,
const InputContext* aContext,
const InputContextAction* aAction);
InputContext GetInputContext();
void OnUpdateComposition();
void OnLayoutChange();
TextEventDispatcher* GetTextEventDispatcher();
protected:
~IMContextWrapper();
// Owner of an instance of this class. This should be top level window.
// The owner window must release the contexts when it's destroyed because
// the IME contexts need the native window. If OnDestroyWindow() is called
// with the owner window, it'll release IME contexts. Otherwise, it'll
// just clean up any existing composition if it's related to the destroying
// child window.
nsWindow* mOwnerWindow;
// A last focused window in this class's context.
nsWindow* mLastFocusedWindow;
// Actual context. This is used for handling the user's input.
GtkIMContext* mContext;
// mSimpleContext is used for the password field and
// the |ime-mode: disabled;| editors if sUseSimpleContext is true.
// These editors disable IME. But dead keys should work. Fortunately,
// the simple IM context of GTK2 support only them.
GtkIMContext* mSimpleContext;
// mDummyContext is a dummy context and will be used in Focus()
// when the state of mEnabled means disabled. This context's IME state is
// always "closed", so it closes IME forcedly.
GtkIMContext* mDummyContext;
// mComposingContext is not nullptr while one of mContext, mSimpleContext
// and mDummyContext has composition.
// XXX: We don't assume that two or more context have composition same time.
GtkIMContext* mComposingContext;
// IME enabled state and other things defined in InputContext.
// Use following helper methods if you don't need the detail of the status.
InputContext mInputContext;
// mCompositionStart is the start offset of the composition string in the
// current content. When <textarea> or <input> have focus, it means offset
// from the first character of them. When a HTML editor has focus, it
// means offset from the first character of the root element of the editor.
uint32_t mCompositionStart;
// mDispatchedCompositionString is the latest composition string which
// was dispatched by compositionupdate event.
nsString mDispatchedCompositionString;
// mSelectedString is the selected string which was removed by first
// compositionchange event.
nsString mSelectedString;
// OnKeyEvent() temporarily sets mProcessingKeyEvent to the given native
// event.
GdkEventKey* mProcessingKeyEvent;
struct Range
{
uint32_t mOffset;
uint32_t mLength;
Range()
: mOffset(UINT32_MAX)
, mLength(UINT32_MAX)
{
}
bool IsValid() const { return mOffset != UINT32_MAX; }
void Clear()
{
mOffset = UINT32_MAX;
mLength = UINT32_MAX;
}
};
// current target offset and length of IME composition
Range mCompositionTargetRange;
// mCompositionState indicates current status of composition.
enum eCompositionState {
eCompositionState_NotComposing,
eCompositionState_CompositionStartDispatched,
eCompositionState_CompositionChangeEventDispatched
};
eCompositionState mCompositionState;
bool IsComposing() const
{
return (mCompositionState != eCompositionState_NotComposing);
}
bool IsComposingOn(GtkIMContext* aContext) const
{
return IsComposing() && mComposingContext == aContext;
}
bool IsComposingOnCurrentContext() const
{
return IsComposingOn(GetCurrentContext());
}
bool EditorHasCompositionString()
{
return (mCompositionState ==
eCompositionState_CompositionChangeEventDispatched);
}
/**
* Checks if aContext is valid context for handling composition.
*
* @param aContext An IM context which is specified by native
* composition events.
* @return true if the context is valid context for
* handling composition. Otherwise, false.
*/
bool IsValidContext(GtkIMContext* aContext) const;
const char* GetCompositionStateName()
{
switch (mCompositionState) {
case eCompositionState_NotComposing:
return "NotComposing";
case eCompositionState_CompositionStartDispatched:
return "CompositionStartDispatched";
case eCompositionState_CompositionChangeEventDispatched:
return "CompositionChangeEventDispatched";
default:
return "InvaildState";
}
}
struct Selection final
{
uint32_t mOffset;
uint32_t mLength;
WritingMode mWritingMode;
Selection()
: mOffset(UINT32_MAX)
, mLength(UINT32_MAX)
{
}
void Clear()
{
mOffset = UINT32_MAX;
mLength = UINT32_MAX;
mWritingMode = WritingMode();
}
void Assign(const IMENotification& aIMENotification);
void Assign(const WidgetQueryContentEvent& aSelectedTextEvent);
bool IsValid() const { return mOffset != UINT32_MAX; }
bool Collapsed() const { return !mLength; }
uint32_t EndOffset() const
{
if (NS_WARN_IF(!IsValid())) {
return UINT32_MAX;
}
CheckedInt<uint32_t> endOffset =
CheckedInt<uint32_t>(mOffset) + mLength;
if (NS_WARN_IF(!endOffset.isValid())) {
return UINT32_MAX;
}
return endOffset.value();
}
} mSelection;
bool EnsureToCacheSelection(nsAString* aSelectedString = nullptr);
// mIsIMFocused is set to TRUE when we call gtk_im_context_focus_in(). And
// it's set to FALSE when we call gtk_im_context_focus_out().
bool mIsIMFocused;
// mFilterKeyEvent is used by OnKeyEvent(). If the commit event should
// be processed as simple key event, this is set to TRUE by the commit
// handler.
bool mFilterKeyEvent;
// mKeyDownEventWasSent is used by OnKeyEvent() and
// DispatchCompositionStart(). DispatchCompositionStart() dispatches
// a keydown event if the composition start is caused by a native
// keypress event. If this is true, the keydown event has been dispatched.
// Then, DispatchCompositionStart() doesn't dispatch keydown event.
bool mKeyDownEventWasSent;
// mIsDeletingSurrounding is true while OnDeleteSurroundingNative() is
// trying to delete the surrounding text.
bool mIsDeletingSurrounding;
// mLayoutChanged is true after OnLayoutChange() is called. This is reset
// when eCompositionChange is being dispatched.
bool mLayoutChanged;
// mSetCursorPositionOnKeyEvent true when caret rect or position is updated
// with no composition. If true, we update candidate window position
// before key down
bool mSetCursorPositionOnKeyEvent;
// mPendingResettingIMContext becomes true if selection change notification
// is received during composition but the selection change occurred before
// starting the composition. In such case, we cannot notify IME of
// selection change during composition because we don't want to commit
// the composition in such case. However, we should notify IME of the
// selection change after the composition is committed.
bool mPendingResettingIMContext;
// mRetrieveSurroundingSignalReceived is true after "retrieve_surrounding"
// signal is received until selection is changed in Gecko.
bool mRetrieveSurroundingSignalReceived;
// sLastFocusedContext is a pointer to the last focused instance of this
// class. When a instance is destroyed and sLastFocusedContext refers it,
// this is cleared. So, this refers valid pointer always.
static IMContextWrapper* sLastFocusedContext;
// sUseSimpleContext indeicates if password editors and editors with
// |ime-mode: disabled;| should use GtkIMContextSimple.
// If true, they use GtkIMContextSimple. Otherwise, not.
static bool sUseSimpleContext;
// Callback methods for native IME events. These methods should call
// the related instance methods simply.
static gboolean OnRetrieveSurroundingCallback(GtkIMContext* aContext,
IMContextWrapper* aModule);
static gboolean OnDeleteSurroundingCallback(GtkIMContext* aContext,
gint aOffset,
gint aNChars,
IMContextWrapper* aModule);
static void OnCommitCompositionCallback(GtkIMContext* aContext,
const gchar* aString,
IMContextWrapper* aModule);
static void OnChangeCompositionCallback(GtkIMContext* aContext,
IMContextWrapper* aModule);
static void OnStartCompositionCallback(GtkIMContext* aContext,
IMContextWrapper* aModule);
static void OnEndCompositionCallback(GtkIMContext* aContext,
IMContextWrapper* aModule);
// The instance methods for the native IME events.
gboolean OnRetrieveSurroundingNative(GtkIMContext* aContext);
gboolean OnDeleteSurroundingNative(GtkIMContext* aContext,
gint aOffset,
gint aNChars);
void OnCommitCompositionNative(GtkIMContext* aContext,
const gchar* aString);
void OnChangeCompositionNative(GtkIMContext* aContext);
void OnStartCompositionNative(GtkIMContext* aContext);
void OnEndCompositionNative(GtkIMContext* aContext);
/**
* GetCurrentContext() returns current IM context which is chosen with the
* enabled state.
* 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 current composition of IME. All native composition events
// during this processing are 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.
* - DispatchCompositionStart
* - DispatchCompositionChangeEvent
* - DispatchCompositionCommitEvent
*/
/**
* 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_