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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_TOOLBAR_BUTTON_H_
6 #define CHROME_BROWSER_UI_VIEWS_TOOLBAR_TOOLBAR_BUTTON_H_
7 
8 #include "ui/views/context_menu_controller.h"
9 #include "ui/views/controls/button/button.h"
10 #include "ui/views/controls/button/label_button.h"
11 
12 namespace ui {
13 class MenuModel;
14 }
15 
16 namespace views {
17 class MenuRunner;
18 }
19 
20 // This class provides basic drawing and mouse-over behavior for buttons
21 // appearing in the toolbar.
22 class ToolbarButton : public views::LabelButton,
23                       public views::ContextMenuController {
24  public:
25   // Takes ownership of the |model|, which can be null if no menu
26   // is to be shown.
27   ToolbarButton(views::ButtonListener* listener, ui::MenuModel* model);
28   virtual ~ToolbarButton();
29 
30   // Set up basic mouseover border behavior.
31   // Should be called before first paint.
32   void Init();
33 
34   // Methods for handling ButtonDropDown-style menus.
35   void ClearPendingMenu();
36   bool IsMenuShowing() const;
37 
38   // views::LabelButton:
39   virtual gfx::Size GetPreferredSize() OVERRIDE;
40   virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE;
41   virtual bool OnMouseDragged(const ui::MouseEvent& event) OVERRIDE;
42   virtual void OnMouseReleased(const ui::MouseEvent& event) OVERRIDE;
43   // Showing the drop down results in a MouseCaptureLost, we need to ignore it.
44   virtual void OnMouseCaptureLost() OVERRIDE;
45   virtual void OnMouseExited(const ui::MouseEvent& event) OVERRIDE;
46   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
47   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
48 
49   // views::ContextMenuController:
50   virtual void ShowContextMenuForView(View* source,
51                                       const gfx::Point& point,
52                                       ui::MenuSourceType source_type) OVERRIDE;
53 
54  protected:
55   // Overridden from CustomButton. Returns true if the button should become
56   // pressed when a user holds the mouse down over the button. For this
57   // implementation, both left and right mouse buttons can trigger a change
58   // to the PUSHED state.
59   virtual bool ShouldEnterPushedState(const ui::Event& event) OVERRIDE;
60 
61   // Returns if menu should be shown. Override this to change default behavior.
62   virtual bool ShouldShowMenu();
63 
64   // Function to show the dropdown menu.
65   virtual void ShowDropDownMenu(ui::MenuSourceType source_type);
66 
67  private:
68   // The model that populates the attached menu.
69   scoped_ptr<ui::MenuModel> model_;
70 
71   // Indicates if menu is currently showing.
72   bool menu_showing_;
73 
74   // Y position of mouse when left mouse button is pressed
75   int y_position_on_lbuttondown_;
76 
77   // Menu runner to display drop down menu.
78   scoped_ptr<views::MenuRunner> menu_runner_;
79 
80   // A factory for tasks that show the dropdown context menu for the button.
81   base::WeakPtrFactory<ToolbarButton> show_menu_factory_;
82 
83   DISALLOW_COPY_AND_ASSIGN(ToolbarButton);
84 };
85 
86 #endif  // CHROME_BROWSER_UI_VIEWS_TOOLBAR_TOOLBAR_BUTTON_H_
87