views: Add OnEnabledChanged() method to View class.

views/view.h

 // Copyright (c) 2011 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 VIEWS_VIEW_H_
 #define VIEWS_VIEW_H_
 #pragma once
 
 #include <algorithm>
 #include <map>
@@ skipping 299 matching lines @@
   // Return whether a view is visible
   virtual bool IsVisible() const;
 
   // Return whether a view and its ancestors are visible. Returns true if the
   // path from this view to the root view is visible.
   virtual bool IsVisibleInRootView() const;
 
   // Set whether this view is enabled. A disabled view does not receive keyboard
   // or mouse inputs. If flag differs from the current value, SchedulePaint is
   // invoked.
-  virtual void SetEnabled(bool flag);
+  void SetEnabled(bool enabled);
 
   // Returns whether the view is enabled.
   virtual bool IsEnabled() const;
 
   // Transformations -----------------------------------------------------------
 
   // Methods for setting transformations for a view (e.g. rotation, scaling).
 
   const ui::Transform& GetTransform() const;
 
@@ skipping 600 matching lines @@
   // Override returning true when the view needs to be notified when its visible
   // bounds relative to the root view may have changed. Only used by
   // NativeViewHost.
   virtual bool NeedsNotificationWhenVisibleBoundsChange() const;
 
   // Notification that this View's visible bounds relative to the root view may
   // have changed. The visible bounds are the region of the View not clipped by
   // its ancestors. This is used for clipping NativeViewHost.
   virtual void OnVisibleBoundsChanged();
 
+  // Override to be notified when the enabled state of this View has
+  // changed. The default implementation calls SchedulePaint() on this View.
+  virtual void OnEnabledChanged();
+
   // TODO(beng): eliminate in protected.
   // Whether this view is enabled.
   bool enabled_;
 
   // Tree operations -----------------------------------------------------------
 
   // This method is invoked when the tree changes.
   //
   // When a view is removed, it is invoked for all children and grand
   // children. For each of these views, a notification is sent to the
@@ skipping 478 matching lines @@
   // The Windows-specific accessibility implementation for this View.
   scoped_refptr<NativeViewAccessibilityWin> native_view_accessibility_win_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_VIEW_H_