Refactors animation to allow for cleaner subclassing. I'm doing this

app/slide_animation.h

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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 APP_SLIDE_ANIMATION_H_
 #define APP_SLIDE_ANIMATION_H_
 
-#include "app/animation.h"
+#include "app/linear_animation.h"
+#include "app/tween.h"
 
 // Slide Animation
 //
 // Used for reversible animations and as a general helper class. Typical usage:
 //
 // #include "app/slide_animation.h"
 //
 // class MyClass : public AnimationDelegate {
 //  public:
 //   MyClass() {
 //     animation_.reset(new SlideAnimation(this));
 //     animation_->SetSlideDuration(500);
 //   }
 //   void OnMouseOver() {
 //     animation_->Show();
 //   }
 //   void OnMouseOut() {
 //     animation_->Hide();
 //   }
 //   void AnimationProgressed(const Animation* animation) {
 //     if (animation == animation_.get()) {
 //       Layout();
 //       SchedulePaint();
 //     } else if (animation == other_animation_.get()) {
 //       ...
 //     }
 //   }
 //   void Layout() {
-//     if (animation_->IsAnimating()) {
+//     if (animation_->is_animating()) {
 //       hover_image_.SetOpacity(animation_->GetCurrentValue());
 //     }
 //   }
 //  private:
 //   scoped_ptr<SlideAnimation> animation_;
 // }
-class SlideAnimation : public Animation {
+class SlideAnimation : public LinearAnimation {
  public:
-  enum TweenType {
-    NONE,          // Linear.
-    EASE_OUT,      // Fast in, slow out (default).
-    EASE_IN,       // Slow in, fast out.
-    EASE_IN_OUT,   // Slow in and out, fast in the middle.
-    FAST_IN_OUT,   // Fast in and out, slow in the middle.
-    EASE_OUT_SNAP, // Fast in, slow out, snap to final value.
-  };
-
   explicit SlideAnimation(AnimationDelegate* target);
   virtual ~SlideAnimation();
 
   // Set the animation back to the 0 state.
   virtual void Reset();
   virtual void Reset(double value);
 
   // Begin a showing animation or reverse a hiding animation in progress.
   virtual void Show();
 
   // Begin a hiding animation or reverse a showing animation in progress.
   virtual void Hide();
 
   // Sets the time a slide will take. Note that this isn't actually
   // the amount of time an animation will take as the current value of
   // the slide is considered.
   virtual void SetSlideDuration(int duration) { slide_duration_ = duration; }
   int GetSlideDuration() const { return slide_duration_; }
-  void SetTweenType(TweenType tween_type) { tween_type_ = tween_type; }
+  void SetTweenType(Tween::Type tween_type) { tween_type_ = tween_type; }
 
   double GetCurrentValue() const { return value_current_; }
   bool IsShowing() const { return showing_; }
   bool IsClosing() const { return !showing_ && value_end_ < value_current_; }
 
  private:
   // Overridden from Animation.
   void AnimateToState(double state);
 
   AnimationDelegate* target_;
 
-  TweenType tween_type_;
+  Tween::Type tween_type_;
 
   // Used to determine which way the animation is going.
   bool showing_;
 
   // Animation values. These are a layer on top of Animation::state_ to
   // provide the reversability.
   double value_start_;
   double value_end_;
   double value_current_;
 
   // How long a hover in/out animation will last for. This defaults to
   // kHoverFadeDurationMS, but can be overridden with SetDuration.
   int slide_duration_;
 
   DISALLOW_COPY_AND_ASSIGN(SlideAnimation);
 };
 
 #endif  // APP_SLIDE_ANIMATION_H_