back_button.h revision cedac228d2dd51db4b79ea1e72c7f249408ee061 
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 Border;
16class ButtonListener;
17}
18
19// A subclass of ToolbarButton to allow the back button's hittest region to
20// extend all the way to the start of the toolbar (i.e. the screen edge) in
21// maximized mode, to benefit from Fitt's Law.  The button images and focus
22// border are still drawn with the normal square shape.
23class BackButton : public ToolbarButton {
24 public:
25  // Takes ownership of the |model|, which can be null if no menu
26  // is to be shown.
27  BackButton(views::ButtonListener* listener, ui::MenuModel* model);
28  virtual ~BackButton();
29
30  void SetLeadingMargin(int margin);
31
32 protected:
33  virtual gfx::Rect GetThemePaintRect() const OVERRIDE;
34  virtual scoped_ptr<views::LabelButtonBorder> CreateDefaultBorder() const
35      OVERRIDE;
36
37 private:
38  // Any leading margin to be applied. Used when the back button is in
39  // a maximized state to extend to the full window width.
40  int margin_leading_;
41
42  DISALLOW_COPY_AND_ASSIGN(BackButton);
43};
44
45#endif  // CHROME_BROWSER_UI_VIEWS_TOOLBAR_BACK_BUTTON_H_
46