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      1 // Copyright 2013 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_VIEWS_TOOLBAR_BACK_BUTTON_H_
      6 #define CHROME_BROWSER_UI_VIEWS_TOOLBAR_BACK_BUTTON_H_
      7 
      8 #include "chrome/browser/ui/views/toolbar/toolbar_button.h"
      9 
     10 namespace ui {
     11 class MenuModel;
     12 }
     13 
     14 namespace views {
     15 class ButtonListener;
     16 }
     17 
     18 // A subclass of ToolbarButton to allow the back button's hittest region to
     19 // extend all the way to the start of the toolbar (i.e. the screen edge) in
     20 // maximized mode, to benefit from Fitt's Law.  The button images and focus
     21 // border are still drawn with the normal square shape.
     22 class BackButton : public ToolbarButton {
     23  public:
     24   // Takes ownership of the |model|, which can be null if no menu
     25   // is to be shown.
     26   BackButton(views::ButtonListener* listener, ui::MenuModel* model);
     27   virtual ~BackButton();
     28 
     29   void SetLeadingMargin(int margin);
     30 
     31  protected:
     32   virtual gfx::Rect GetThemePaintRect() const OVERRIDE;
     33 
     34  private:
     35   // Any leading margin to be applied. Used when the back button is in
     36   // a maximized state to extend to the full window width.
     37   int margin_leading_;
     38 
     39   DISALLOW_COPY_AND_ASSIGN(BackButton);
     40 };
     41 
     42 #endif  // CHROME_BROWSER_UI_VIEWS_TOOLBAR_BACK_BUTTON_H_
     43