gecko-dev/widget/gtk2/nsGtkIMModule.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 __nsGtkIMModule_h__
#define __nsGtkIMModule_h__
#include <gdk/gdk.h>
#include <gtk/gtk.h>
#include "nsString.h"
#include "nsAutoPtr.h"
#include "nsTArray.h"
#include "nsGUIEvent.h"
#include "nsIWidget.h"
// If software keyboard is needed in password field and uses GTK2 IM module
// for inputting characters, we need to enable IME in password field too.
#ifdef MOZ_PLATFORM_MAEMO
#define NS_IME_ENABLED_ON_PASSWORD_FIELD 1
#endif
class nsWindow;
class nsGtkIMModule
{
protected:
typedef mozilla::widget::InputContext InputContext;
typedef mozilla::widget::InputContextAction InputContextAction;
public:
nsrefcnt AddRef()
{
NS_PRECONDITION(PRInt32(mRefCnt) >= 0, "mRefCnt is negative");
++mRefCnt;
NS_LOG_ADDREF(this, mRefCnt, "nsGtkIMModule", sizeof(*this));
return mRefCnt;
}
nsrefcnt Release()
{
NS_PRECONDITION(mRefCnt != 0, "mRefCnt is alrady zero");
--mRefCnt;
NS_LOG_RELEASE(this, mRefCnt, "nsGtkIMModule");
if (mRefCnt == 0) {
mRefCnt = 1; /* stabilize */
delete this;
return 0;
}
return mRefCnt;
}
protected:
nsAutoRefCnt mRefCnt;
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).
nsGtkIMModule(nsWindow* aOwnerWindow);
~nsGtkIMModule();
// "Enabled" means the users can use all IMEs.
// I.e., the focus is in the normal editors.
bool IsEnabled();
// 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);
// 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 ResetInputState(nsWindow* aCaller);
void SetInputContext(nsWindow* aCaller,
const InputContext* aContext,
const InputContextAction* aAction);
InputContext GetInputContext();
nsresult CancelIMEComposition(nsWindow* aCaller);
// If a software keyboard has been opened, this returns TRUE.
// Otherwise, FALSE.
static bool IsVirtualKeyboardOpened();
protected:
// 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;
#ifndef NS_IME_ENABLED_ON_PASSWORD_FIELD
// mSimpleContext is used for the password field and
// the |ime-mode: disabled;| editors. These editors disable IME.
// But dead keys should work. Fortunately, the simple IM context of
// GTK2 support only them.
GtkIMContext *mSimpleContext;
#endif // NS_IME_ENABLED_ON_PASSWORD_FIELD
// 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;
// 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.
PRUint32 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
// text event.
nsString mSelectedString;
// OnKeyEvent() temporarily sets mProcessingKeyEvent to the given native
// event.
GdkEventKey* mProcessingKeyEvent;
// mCompositionState indicates current status of composition.
enum eCompositionState {
eCompositionState_NotComposing,
eCompositionState_CompositionStartDispatched,
eCompositionState_TextEventDispatched,
eCompositionState_CommitTextEventDispatched
};
eCompositionState mCompositionState;
bool IsComposing()
{
return (mCompositionState != eCompositionState_NotComposing);
}
bool EditorHasCompositionString()
{
return (mCompositionState == eCompositionState_TextEventDispatched);
}
#ifdef PR_LOGGING
const char* GetCompositionStateName()
{
switch (mCompositionState) {
case eCompositionState_NotComposing:
return "NotComposing";
case eCompositionState_CompositionStartDispatched:
return "CompositionStartDispatched";
case eCompositionState_TextEventDispatched:
return "TextEventDispatched";
case eCompositionState_CommitTextEventDispatched:
return "CommitTextEventDispatched";
default:
return "InvaildState";
}
}
#endif // PR_LOGGING
// 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;
// When mIgnoreNativeCompositionEvent is TRUE, all native composition
// should be ignored except that the compositon should be restarted in
// another content (nsIContent). Don't refer this value directly, use
// ShouldIgnoreNativeCompositionEvent().
bool mIgnoreNativeCompositionEvent;
// 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;
// sLastFocusedModule is a pointer to the last focused instance of this
// class. When a instance is destroyed and sLastFocusedModule refers it,
// this is cleared. So, this refers valid pointer always.
static nsGtkIMModule* sLastFocusedModule;
// Callback methods for native IME events. These methods should call
// the related instance methods simply.
static gboolean OnRetrieveSurroundingCallback(GtkIMContext *aContext,
nsGtkIMModule *aModule);
static gboolean OnDeleteSurroundingCallback(GtkIMContext *aContext,
gint aOffset,
gint aNChars,
nsGtkIMModule *aModule);
static void OnCommitCompositionCallback(GtkIMContext *aContext,
const gchar *aString,
nsGtkIMModule* aModule);
static void OnChangeCompositionCallback(GtkIMContext *aContext,
nsGtkIMModule* aModule);
static void OnStartCompositionCallback(GtkIMContext *aContext,
nsGtkIMModule* aModule);
static void OnEndCompositionCallback(GtkIMContext *aContext,
nsGtkIMModule* 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);
// GetContext() returns current IM context which is chosen by the enabled
// state. So, this means *current* IM context.
GtkIMContext* GetContext();
// "Editable" means the users can input characters. They may be not able to
// use IMEs but they can use dead keys.
// I.e., the focus is in the normal editors or the password editors or
// the |ime-mode: disabled;| editors.
bool IsEditable();
// 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(nsAString &aCompositionString);
// Generates our text range list from current composition string.
void SetTextRangeList(nsTArray<nsTextRange> &aTextRangeList);
// Sets the offset's cursor position to IME.
void SetCursorPosition(PRUint32 aTargetOffset);
// Queries the current selection offset of the window.
PRUint32 GetSelectionOffset(nsWindow* aWindow);
// Get current paragraph text content and cursor position
nsresult GetCurrentParagraph(nsAString& aText, PRUint32& aCursorPos);
// Delete text portion
nsresult DeleteText(const PRInt32 aOffset, const PRUint32 aNChars);
// Initializes the GUI event.
void InitEvent(nsGUIEvent& aEvent);
// Called before destroying the context to work around some platform bugs.
void PrepareToDestroyContext(GtkIMContext *aContext);
bool ShouldIgnoreNativeCompositionEvent();
/**
* 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.
* - CommitCompositionBy
* - DispatchCompositionStart
* - DispatchCompositionEnd
* - DispatchTextEvent
*/
// Commits the current composition by the aString.
bool CommitCompositionBy(const nsAString& aString);
// Dispatches a composition start event or a composition end event.
bool DispatchCompositionStart();
bool DispatchCompositionEnd();
// Dispatches a text event. If aIsCommit is TRUE, dispatches a committed
// text event. Otherwise, dispatches a composing text event.
bool DispatchTextEvent(const nsAString& aCompositionString,
bool aIsCommit);
};
#endif // __nsGtkIMModule_h__