views: Dispatch mouse events using EventDispatch interface too.

ui/views/view.h

 // Copyright (c) 2012 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 UI_VIEWS_VIEW_H_
 #define UI_VIEWS_VIEW_H_
 
 #include <algorithm>
 #include <map>
 #include <set>
@@ skipping 888 matching lines @@
   // to scroll by a default amount.
   //
   // See VariableRowHeightScrollHelper and FixedRowHeightScrollHelper for
   // implementations of common cases.
   virtual int GetPageScrollIncrement(ScrollView* scroll_view,
                                      bool is_horizontal, bool is_positive);
   virtual int GetLineScrollIncrement(ScrollView* scroll_view,
                                      bool is_horizontal, bool is_positive);
 
  protected:
+  // Used to track a drag. RootView passes this into
+  // ProcessMousePressed/Dragged.
+  struct DragInfo {
+    // Sets possible_drag to false and start_x/y to 0. This is invoked by
+    // RootView prior to invoke ProcessMousePressed.
+    void Reset();
+
+    // Sets possible_drag to true and start_pt to the specified point.
+    // This is invoked by the target view if it detects the press may generate
+    // a drag.
+    void PossibleDrag(const gfx::Point& p);
+
+    // Whether the press may generate a drag.
+    bool possible_drag;
+
+    // Coordinates of the mouse press.
+    gfx::Point start_pt;
+  };
+
   // Size and disposition ------------------------------------------------------
 
   // Override to be notified when the bounds of the view have changed.
   virtual void OnBoundsChanged(const gfx::Rect& previous_bounds);
 
   // Called when the preferred size of a child view changed.  This gives the
   // parent an opportunity to do a fresh layout if that makes sense.
   virtual void ChildPreferredSizeChanged(View* child) {}
 
   // Called when the visibility of a child view changed.  This gives the parent
@@ skipping 124 matching lines @@
   // Called by HitTestRect() to see if this View has a custom hit test mask. If
   // the return value is true, GetHitTestMask() will be called to obtain the
   // mask. Default value is false, in which case the View will hit-test against
   // its bounds.
   virtual bool HasHitTestMask() const;
 
   // Called by HitTestRect() to retrieve a mask for hit-testing against.
   // Subclasses override to provide custom shaped hit test regions.
   virtual void GetHitTestMask(gfx::Path* mask) const;
 
+  virtual DragInfo* GetDragInfo();
+
   // Focus ---------------------------------------------------------------------
 
   // Override to be notified when focus has changed either to or from this View.
   virtual void OnFocus();
   virtual void OnBlur();
 
   // Handle view focus/blur events for this view.
   void Focus();
   void Blur();
 
@@ skipping 64 matching lines @@
   // function makes the decision explicit.
   std::string DoPrintViewGraph(bool first, View* view_with_children);
 #endif
 
  private:
   friend class internal::PostEventDispatchHandler;
   friend class internal::RootView;
   friend class FocusManager;
   friend class Widget;
 
-  // Used to track a drag. RootView passes this into
-  // ProcessMousePressed/Dragged.
-  struct DragInfo {
-    // Sets possible_drag to false and start_x/y to 0. This is invoked by
-    // RootView prior to invoke ProcessMousePressed.
-    void Reset();
-
-    // Sets possible_drag to true and start_pt to the specified point.
-    // This is invoked by the target view if it detects the press may generate
-    // a drag.
-    void PossibleDrag(const gfx::Point& p);
-
-    // Whether the press may generate a drag.
-    bool possible_drag;
-
-    // Coordinates of the mouse press.
-    gfx::Point start_pt;
-  };
-
   // Painting  -----------------------------------------------------------------
 
   enum SchedulePaintType {
     // Indicates the size is the same (only the origin changed).
     SCHEDULE_PAINT_SIZE_SAME,
 
     // Indicates the size changed (and possibly the origin).
     SCHEDULE_PAINT_SIZE_CHANGED
   };
 
@@ skipping 119 matching lines @@
   // Orphans the layers in this subtree that are parented to layers outside of
   // this subtree.
   void OrphanLayers();
 
   // Destroys the layer associated with this view, and reparents any descendants
   // to the destroyed layer's parent.
   void DestroyLayer();
 
   // Input ---------------------------------------------------------------------
 
-  // RootView invokes these. These in turn invoke the appropriate OnMouseXXX
-  // method. If a drag is detected, DoDrag is invoked.
-  bool ProcessMousePressed(const ui::MouseEvent& event, DragInfo* drop_info);
-  bool ProcessMouseDragged(const ui::MouseEvent& event, DragInfo* drop_info);
+  bool ProcessMousePressed(const ui::MouseEvent& event);
+  bool ProcessMouseDragged(const ui::MouseEvent& event);
   void ProcessMouseReleased(const ui::MouseEvent& event);
 
   // Accelerators --------------------------------------------------------------
 
   // Registers this view's keyboard accelerators that are not registered to
   // FocusManager yet, if possible.
   void RegisterPendingAccelerators();
 
   // Unregisters all the keyboard accelerators associated with this view.
   // |leave_data_intact| if true does not remove data from accelerators_ array,
@@ skipping 182 matching lines @@
   base::win::ScopedComPtr<NativeViewAccessibilityWin>
       native_view_accessibility_win_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_VIEW_H_