Enable mash shelf tooltips.

ash/shelf/shelf_button.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_SHELF_SHELF_BUTTON_H_
 #define ASH_SHELF_SHELF_BUTTON_H_
 
 #include "ash/ash_export.h"
 #include "base/macros.h"
 #include "ui/gfx/shadow_value.h"
 #include "ui/views/controls/button/custom_button.h"
 #include "ui/views/controls/image_view.h"
 
 namespace ash {
-class Shelf;
-class ShelfButtonHost;
+class ShelfView;
 
 // Button used for items on the launcher, except for the AppList.
 class ASH_EXPORT ShelfButton : public views::CustomButton {
  public:
   static const char kViewClassName[];
 
   // Used to indicate the current state of the button.
   enum State {
     // Nothing special. Usually represents an app shortcut item with no running
     // instance.
     STATE_NORMAL    = 0,
     // Button has mouse hovering on it.
     STATE_HOVERED   = 1 << 0,
     // Underlying ShelfItem has a running instance.
     STATE_RUNNING   = 1 << 1,
     // Underlying ShelfItem is active (i.e. has focus).
     STATE_ACTIVE    = 1 << 2,
     // Underlying ShelfItem needs user's attention.
     STATE_ATTENTION = 1 << 3,
     STATE_FOCUSED   = 1 << 4,
     // Hide the status (temporarily for some animations).
     STATE_HIDDEN = 1 << 5,
   };
 
+  explicit ShelfButton(ShelfView* shelf_view);
   ~ShelfButton() override;
 
-  // Called to create an instance of a ShelfButton.
-  static ShelfButton* Create(views::ButtonListener* listener,
-                             ShelfButtonHost* host,
-                             Shelf* shelf);
-
   // Sets the image to display for this entry.
   void SetImage(const gfx::ImageSkia& image);
 
   // Retrieve the image to show proxy operations.
   const gfx::ImageSkia& GetImage() const;
 
   // |state| is or'd into the current state.
   void AddState(State state);
   void ClearState(State state);
   int state() const { return state_; }
-  const Shelf* shelf() const { return shelf_; }
 
   // Returns the bounds of the icon.
   gfx::Rect GetIconBounds() const;
 
   // Overrides to views::CustomButton:
   void ShowContextMenu(const gfx::Point& p,
                        ui::MenuSourceType source_type) override;
 
   // View override - needed by unit test.
   void OnMouseCaptureLost() override;
 
  protected:
-  ShelfButton(views::ButtonListener* listener,
-              ShelfButtonHost* host,
-              Shelf* shelf);
-
-  // Class that draws the icon part of a button, so it can be animated
-  // independently of the rest. This can be subclassed to provide a custom
-  // implementation, by overriding CreateIconView().
-  class IconView : public views::ImageView {
-   public:
-    IconView();
-    ~IconView() override;
-
-    void set_icon_size(int icon_size) { icon_size_ = icon_size; }
-    int icon_size() const { return icon_size_; }
-
-   private:
-    // Set to non-zero to force icons to be resized to fit within a square,
-    // while maintaining original proportions.
-    int icon_size_;
-
-    DISALLOW_COPY_AND_ASSIGN(IconView);
-  };
-
   // View overrides:
   const char* GetClassName() const override;
   bool OnMousePressed(const ui::MouseEvent& event) override;
   void OnMouseReleased(const ui::MouseEvent& event) override;
   bool OnMouseDragged(const ui::MouseEvent& event) override;
-  void OnMouseMoved(const ui::MouseEvent& event) override;
-  void OnMouseEntered(const ui::MouseEvent& event) override;
-  void OnMouseExited(const ui::MouseEvent& event) override;
   void GetAccessibleState(ui::AXViewState* state) override;
   void Layout() override;
   void ChildPreferredSizeChanged(views::View* child) override;
   void OnFocus() override;
   void OnBlur() override;
   void OnPaint(gfx::Canvas* canvas) override;
 
   // ui::EventHandler overrides:
   void OnGestureEvent(ui::GestureEvent* event) override;
 
   // Sets the icon image with a shadow.
   void SetShadowedImage(const gfx::ImageSkia& bitmap);
-  // Override for custom initialization.
-  virtual void Init();
-  // Override to subclass IconView.
-  virtual IconView* CreateIconView();
-  IconView* icon_view() const { return icon_view_; }
-  ShelfButtonHost* host() const { return host_; }
 
  private:
   class BarView;
 
   // Updates the parts of the button to reflect the current |state_| and
   // alignment. This may add or remove views, layout and paint.
   void UpdateState();
 
   // Updates the status bar (bitmap, orientation, visibility).
   void UpdateBar();
 
-  ShelfButtonHost* host_;
-  IconView* icon_view_;
+  // The shelf view hosting this button.
+  ShelfView* shelf_view_;
+
+  // The icon part of a button can be animated independently of the rest.
+  views::ImageView* icon_view_;
+
   // Draws a bar underneath the image to represent the state of the application.
   BarView* bar_;
-  // The current state of the application, multiple values of AppState are or'd
-  // together.
+
+  // The current application state, a bitfield of State enum values.
   int state_;
 
-  Shelf* shelf_;
-
   gfx::ShadowValues icon_shadows_;
 
   // If non-null the destuctor sets this to true. This is set while the menu is
   // showing and used to detect if the menu was deleted while running.
   bool* destroyed_flag_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfButton);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_BUTTON_H_