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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_UI_GTK_BACK_FORWARD_BUTTON_GTK_H_
      6 #define CHROME_BROWSER_UI_GTK_BACK_FORWARD_BUTTON_GTK_H_
      7 #pragma once
      8 
      9 #include "base/memory/scoped_ptr.h"
     10 #include "base/task.h"
     11 #include "chrome/browser/ui/gtk/custom_button.h"
     12 #include "chrome/browser/ui/gtk/menu_gtk.h"
     13 #include "ui/base/gtk/gtk_signal.h"
     14 
     15 class BackForwardMenuModel;
     16 class Browser;
     17 
     18 typedef struct _GtkWidget GtkWidget;
     19 
     20 // When clicked, these buttons will navigate forward or backward. When
     21 // pressed and held, they show a dropdown menu of recent web sites.
     22 class BackForwardButtonGtk : MenuGtk::Delegate {
     23  public:
     24   BackForwardButtonGtk(Browser* browser, bool is_forward);
     25   virtual ~BackForwardButtonGtk();
     26 
     27   // MenuGtk::Delegate implementation.
     28   virtual void StoppedShowing();
     29   virtual bool AlwaysShowIconForCmd(int command_id) const;
     30 
     31   GtkWidget* widget() { return button_->widget(); }
     32 
     33  private:
     34   // Executes the browser command.
     35   CHROMEGTK_CALLBACK_0(BackForwardButtonGtk, void, OnClick);
     36 
     37   // Starts a timer to show the dropdown menu.
     38   CHROMEGTK_CALLBACK_1(BackForwardButtonGtk, gboolean, OnButtonPress,
     39                        GdkEventButton*);
     40 
     41   // If there is a timer to show the dropdown menu, and the mouse has moved
     42   // sufficiently down the screen, cancel the timer and immediately show the
     43   // menu.
     44   CHROMEGTK_CALLBACK_1(BackForwardButtonGtk, gboolean, OnMouseMove,
     45                        GdkEventMotion*);
     46 
     47   // Shows the dropdown menu.
     48   void ShowBackForwardMenu(int button, guint32 event_time);
     49 
     50   // The menu gets reset every time it is shown.
     51   scoped_ptr<MenuGtk> menu_;
     52 
     53   scoped_ptr<CustomDrawButton> button_;
     54 
     55   // The browser to which we will send commands.
     56   Browser* browser_;
     57 
     58   // Whether this button is a forward button.
     59   bool is_forward_;
     60 
     61   // The dropdown menu model.
     62   scoped_ptr<BackForwardMenuModel> menu_model_;
     63 
     64   // The y position of the last mouse down event.
     65   int y_position_of_last_press_;
     66 
     67   ScopedRunnableMethodFactory<BackForwardButtonGtk> show_menu_factory_;
     68 
     69   DISALLOW_COPY_AND_ASSIGN(BackForwardButtonGtk);
     70 };
     71 
     72 #endif  // CHROME_BROWSER_UI_GTK_BACK_FORWARD_BUTTON_GTK_H_
     73