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 Border;
  16 class 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.
  23 class 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   ~BackButton() override;
  29
  30   void SetLeadingMargin(int margin);
  31
  32  protected:
  33   // ToolbarButton:
  34   gfx::Point CalculateInkDropCenter() const override;
  35
  36  private:
  37   // ToolbarButton:
  38   const char* GetClassName() const override;
  39   scoped_ptr<views::LabelButtonBorder> CreateDefaultBorder() const override;
  40   gfx::Rect GetThemePaintRect() const override;
  41
  42   // Any leading margin to be applied. Used when the back button is in
  43   // a maximized state to extend to the full window width.
  44   int margin_leading_;
  45
  46   DISALLOW_COPY_AND_ASSIGN(BackButton);
  47 };
  48
  49 #endif  // CHROME_BROWSER_UI_VIEWS_TOOLBAR_BACK_BUTTON_H_