Reland r107720 - Enable the new layer animation framework.

ui/gfx/compositor/layer_animation_element.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 UI_GFX_COMPOSITOR_LAYER_ANIMATION_ELEMENT_H_
 #define UI_GFX_COMPOSITOR_LAYER_ANIMATION_ELEMENT_H_
 #pragma once
 
 #include <set>
 
 #include "base/time.h"
 #include "ui/gfx/compositor/compositor_export.h"
-
-namespace gfx {
-class Rect;
-}  // gfx
+#include "ui/gfx/rect.h"
+#include "ui/gfx/transform.h"
 
 namespace ui {
 
 class LayerAnimationDelegate;
 class Transform;
 
 // LayerAnimationElements represent one segment of an animation between two
 // keyframes. They know how to update a LayerAnimationDelegate given a value
 // between 0 and 1 (0 for initial, and 1 for final).
 class COMPOSITOR_EXPORT LayerAnimationElement {
  public:
   enum AnimatableProperty {
     TRANSFORM = 0,
     BOUNDS,
     OPACITY
   };
 
+  struct TargetValue {
+    gfx::Rect bounds;
+    Transform transform;
+    float opacity;

[sky, 2011/10/20 23:31:35]

initialize opacity to 0.

+  };
+
   typedef std::set<AnimatableProperty> AnimatableProperties;
 
   LayerAnimationElement(const AnimatableProperties& properties,
                         base::TimeDelta duration);
   virtual ~LayerAnimationElement();
 
   // Creates an element that transitions to the given transform. The caller owns
   // the return value.
   static LayerAnimationElement* CreateTransformElement(
       const Transform& transform,
@@ skipping 20 matching lines @@
   // Updates the delegate to the appropriate value for |t|, which is in the
   // range [0, 1] (0 for initial, and 1 for final). If the animation is not
   // aborted, it is guaranteed that Progress will eventually be called with
   // t = 1.0.
   void Progress(double t, LayerAnimationDelegate* delegate);
 
   // Called if the animation is not allowed to complete. This may be called
   // before OnStarted or Progress.
   void Abort();
 
+  // Assigns the target value to |target|.
+  void GetTargetValue(TargetValue* target) const;
+
   // The properties that the element modifies.
   const AnimatableProperties& properties() const { return properties_; }
 
   // The duration of the animation
   base::TimeDelta duration() const { return duration_; }
 
  protected:
   // Called once each time the animation element is run before any call to
   // OnProgress.
   virtual void OnStart(LayerAnimationDelegate* delegate) = 0;
   virtual void OnProgress(double t, LayerAnimationDelegate* delegate) = 0;
+  virtual void OnGetTarget(TargetValue* target) const = 0;
   virtual void OnAbort() = 0;
 
  private:
   bool first_frame_;
   const AnimatableProperties properties_;
   const base::TimeDelta duration_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerAnimationElement);
 };
 
 }  // namespace ui
 
 #endif  // UI_GFX_COMPOSITOR_LAYER_ANIMATION_ELEMENT_H_