chrome/browser/ui/views/toolbar/toolbar_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_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   ~ToolbarButton() override;
  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   gfx::Size GetPreferredSize() const override;
  40   bool OnMousePressed(const ui::MouseEvent& event) override;
  41   bool OnMouseDragged(const ui::MouseEvent& event) override;
  42   void OnMouseReleased(const ui::MouseEvent& event) override;
  43   // Showing the drop down results in a MouseCaptureLost, we need to ignore it.
  44   void OnMouseCaptureLost() override;
  45   void OnMouseExited(const ui::MouseEvent& event) override;
  46   void OnGestureEvent(ui::GestureEvent* event) override;
  47   void GetAccessibleState(ui::AXViewState* state) override;
  48   scoped_ptr<views::LabelButtonBorder> CreateDefaultBorder() const override;
  49
  50   // views::ContextMenuController:
  51   void ShowContextMenuForView(View* source,
  52                               const gfx::Point& point,
  53                               ui::MenuSourceType source_type) override;
  54
  55  protected:
  56   // Overridden from CustomButton. Returns true if the button should become
  57   // pressed when a user holds the mouse down over the button. For this
  58   // implementation, both left and right mouse buttons can trigger a change
  59   // to the PUSHED state.
  60   bool ShouldEnterPushedState(const ui::Event& event) override;
  61
  62   // Returns if menu should be shown. Override this to change default behavior.
  63   virtual bool ShouldShowMenu();
  64
  65   // Function to show the dropdown menu.
  66   virtual void ShowDropDownMenu(ui::MenuSourceType source_type);
  67
  68  private:
  69   // views::LabelButton:
  70   const char* GetClassName() const override;
  71
  72   // The model that populates the attached menu.
  73   scoped_ptr<ui::MenuModel> model_;
  74
  75   // Indicates if menu is currently showing.
  76   bool menu_showing_;
  77
  78   // Y position of mouse when left mouse button is pressed
  79   int y_position_on_lbuttondown_;
  80
  81   // Menu runner to display drop down menu.
  82   scoped_ptr<views::MenuRunner> menu_runner_;
  83
  84   // A factory for tasks that show the dropdown context menu for the button.
  85   base::WeakPtrFactory<ToolbarButton> show_menu_factory_;
  86
  87   DISALLOW_COPY_AND_ASSIGN(ToolbarButton);
  88 };
  89
  90 #endif  // CHROME_BROWSER_UI_VIEWS_TOOLBAR_TOOLBAR_BUTTON_H_