chrome/browser/ui/views/toolbar/back_button.h

   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_