root/ui/base/gtk/focus_store_gtk.h

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INCLUDED FROM

// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_BASE_GTK_FOCUS_STORE_GTK_H_
#define UI_BASE_GTK_FOCUS_STORE_GTK_H_

#include "base/basictypes.h"
#include "ui/base/ui_base_export.h"

typedef struct _GtkWidget GtkWidget;

namespace ui {

class UI_BASE_EXPORT FocusStoreGtk {
 public:
  FocusStoreGtk();
  ~FocusStoreGtk();

  GtkWidget* widget() const { return widget_; }

  // Save the widget that is currently focused for |widget|'s toplevel (NOT
  // |widget|).
  void Store(GtkWidget* widget);

  // Save |widget| as the focus widget. Call with NULL to clear |widget_|.
  void SetWidget(GtkWidget* widget);

 private:
  // Disconnect the previous destroy handler (if any).
  void DisconnectDestroyHandler();

  // The widget which last had focus.
  GtkWidget* widget_;

  // The widget for which we've stored focus might be destroyed by the time we
  // want to restore focus. Thus we connect to the "destroy" signal on that
  // widget. This is the ID for the destroy handler.
  unsigned int destroy_handler_id_;

  DISALLOW_COPY_AND_ASSIGN(FocusStoreGtk);
};

}  // namespace ui

#endif  // UI_BASE_GTK_FOCUS_STORE_GTK_H_
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