back_button.h revision a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7 
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
10namespace ui {
11class MenuModel;
12}
13
14namespace views {
15class 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.
22class 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