ash/shelf/shelf_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 ASH_SHELF_SHELF_BUTTON_H_
   6 #define ASH_SHELF_SHELF_BUTTON_H_
   7
   8 #include "ash/ash_export.h"
   9 #include "ui/gfx/shadow_value.h"
  10 #include "ui/views/controls/button/custom_button.h"
  11 #include "ui/views/controls/image_view.h"
  12
  13 namespace ash {
  14 class ShelfButtonHost;
  15 class ShelfLayoutManager;
  16
  17 // Button used for items on the launcher, except for the AppList.
  18 class ASH_EXPORT ShelfButton : public views::CustomButton {
  19  public:
  20   static const char kViewClassName[];
  21
  22   // Used to indicate the current state of the button.
  23   enum State {
  24     // Nothing special. Usually represents an app shortcut item with no running
  25     // instance.
  26     STATE_NORMAL    = 0,
  27     // Button has mouse hovering on it.
  28     STATE_HOVERED   = 1 << 0,
  29     // Underlying ShelfItem has a running instance.
  30     STATE_RUNNING   = 1 << 1,
  31     // Underlying ShelfItem is active (i.e. has focus).
  32     STATE_ACTIVE    = 1 << 2,
  33     // Underlying ShelfItem needs user's attention.
  34     STATE_ATTENTION = 1 << 3,
  35     STATE_FOCUSED   = 1 << 4,
  36     // Hide the status (temporarily for some animations).
  37     STATE_HIDDEN = 1 << 5,
  38   };
  39
  40   ~ShelfButton() override;
  41
  42   // Called to create an instance of a ShelfButton.
  43   static ShelfButton* Create(views::ButtonListener* listener,
  44                              ShelfButtonHost* host,
  45                              ShelfLayoutManager* shelf_layout_manager);
  46
  47   // Sets the image to display for this entry.
  48   void SetImage(const gfx::ImageSkia& image);
  49
  50   // Retrieve the image to show proxy operations.
  51   const gfx::ImageSkia& GetImage() const;
  52
  53   // |state| is or'd into the current state.
  54   void AddState(State state);
  55   void ClearState(State state);
  56   int state() const { return state_; }
  57   const ShelfLayoutManager* shelf_layout_manager() const {
  58     return shelf_layout_manager_;
  59   }
  60
  61   // Returns the bounds of the icon.
  62   gfx::Rect GetIconBounds() const;
  63
  64   // Overrides to views::CustomButton:
  65   void ShowContextMenu(const gfx::Point& p,
  66                        ui::MenuSourceType source_type) override;
  67
  68   // View override - needed by unit test.
  69   void OnMouseCaptureLost() override;
  70
  71  protected:
  72   ShelfButton(views::ButtonListener* listener,
  73               ShelfButtonHost* host,
  74               ShelfLayoutManager* shelf_layout_manager);
  75
  76   // Class that draws the icon part of a button, so it can be animated
  77   // independently of the rest. This can be subclassed to provide a custom
  78   // implementation, by overriding CreateIconView().
  79   class IconView : public views::ImageView {
  80    public:
  81     IconView();
  82     ~IconView() override;
  83
  84     void set_icon_size(int icon_size) { icon_size_ = icon_size; }
  85     int icon_size() const { return icon_size_; }
  86
  87    private:
  88     // Set to non-zero to force icons to be resized to fit within a square,
  89     // while maintaining original proportions.
  90     int icon_size_;
  91
  92     DISALLOW_COPY_AND_ASSIGN(IconView);
  93   };
  94
  95   // View overrides:
  96   const char* GetClassName() const override;
  97   bool OnMousePressed(const ui::MouseEvent& event) override;
  98   void OnMouseReleased(const ui::MouseEvent& event) override;
  99   bool OnMouseDragged(const ui::MouseEvent& event) override;
 100   void OnMouseMoved(const ui::MouseEvent& event) override;
 101   void OnMouseEntered(const ui::MouseEvent& event) override;
 102   void OnMouseExited(const ui::MouseEvent& event) override;
 103   void GetAccessibleState(ui::AXViewState* state) override;
 104   void Layout() override;
 105   void ChildPreferredSizeChanged(views::View* child) override;
 106   void OnFocus() override;
 107   void OnBlur() override;
 108   void OnPaint(gfx::Canvas* canvas) override;
 109
 110   // ui::EventHandler overrides:
 111   void OnGestureEvent(ui::GestureEvent* event) override;
 112
 113   // Sets the icon image with a shadow.
 114   void SetShadowedImage(const gfx::ImageSkia& bitmap);
 115   // Override for custom initialization.
 116   virtual void Init();
 117   // Override to subclass IconView.
 118   virtual IconView* CreateIconView();
 119   IconView* icon_view() const { return icon_view_; }
 120   ShelfButtonHost* host() const { return host_; }
 121
 122  private:
 123   class BarView;
 124
 125   // Returns true if the shelf is horizontal. If this returns false the shelf is
 126   // vertical.
 127   bool IsShelfHorizontal() const;
 128
 129   // Updates the parts of the button to reflect the current |state_| and
 130   // alignment. This may add or remove views, layout and paint.
 131   void UpdateState();
 132
 133   // Updates the status bar (bitmap, orientation, visibility).
 134   void UpdateBar();
 135
 136   ShelfButtonHost* host_;
 137   IconView* icon_view_;
 138   // Draws a bar underneath the image to represent the state of the application.
 139   BarView* bar_;
 140   // The current state of the application, multiple values of AppState are or'd
 141   // together.
 142   int state_;
 143
 144   ShelfLayoutManager* shelf_layout_manager_;
 145
 146   gfx::ShadowValues icon_shadows_;
 147
 148   // If non-null the destuctor sets this to true. This is set while the menu is
 149   // showing and used to detect if the menu was deleted while running.
 150   bool* destroyed_flag_;
 151
 152   DISALLOW_COPY_AND_ASSIGN(ShelfButton);
 153 };
 154
 155 }  // namespace ash
 156
 157 #endif  // ASH_SHELF_SHELF_BUTTON_H_