Explicit animation support

ui/gfx/compositor/layer_animation_element.cc

+// 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.
+
+#include "ui/gfx/compositor/layer_animation_element.h"
+
+#include "ui/base/animation/tween.h"
+#include "ui/gfx/compositor/layer_animation_delegate.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/transform.h"
+
+namespace ui {
+
+namespace {
+
+class TransitionBase : public LayerAnimationElement {
+ public:
+  TransitionBase(LayerAnimationElement::AnimatableProperty property,
+                 base::TimeDelta duration)
+      : first_frame_(true),
+        duration_(duration) {
+    properties_.insert(property);
+  }
+
+  virtual ~TransitionBase() {}
+
+ protected:
+  virtual void OnProgress(double t, LayerAnimationDelegate* delegate) = 0;
+  bool first_frame() const { return first_frame_; }
+
+ private:
+  virtual void Progress(double t, LayerAnimationDelegate* delegate) {

[sky, 2011/10/14 16:39:52]

Use OVERRIDE on all these.

+    OnProgress(t, delegate);
+    delegate->ScheduleDrawForAnimation();
+    first_frame_ = t == 1.0; // when we've completed, reset to first frame.
+  }
+
+  virtual void Abort() {
+    // reset.
+    first_frame_ = true;
+  }
+
+  virtual const AnimatableProperties& Properties() const {
+    return properties_;
+  }
+
+  virtual base::TimeDelta Duration() const {
+    return duration_;
+  }
+
+  bool first_frame_;
+  AnimatableProperties properties_;
+  base::TimeDelta duration_;
+
+  DISALLOW_COPY_AND_ASSIGN(TransitionBase);
+};
+
+class TransformTransition : public TransitionBase {
+ public:
+  TransformTransition(const Transform& target, base::TimeDelta duration)
+      : TransitionBase(LayerAnimationElement::TRANSFORM, duration),
+        target_(target) {
+  }
+  virtual ~TransformTransition() {}
+
+ protected:
+  virtual void OnProgress(double t, LayerAnimationDelegate* delegate) {
+    if (first_frame())
+      start_ = delegate->GetTransformForAnimation();
+    delegate->SetTransformFromAnimation(
+        Tween::ValueBetween(t, start_, target_));
+  }
+
+ private:
+  Transform start_;
+  Transform target_;
+
+  DISALLOW_COPY_AND_ASSIGN(TransformTransition);
+};
+
+class BoundsTransition : public TransitionBase {
+ public:
+  BoundsTransition(const gfx::Rect& target, base::TimeDelta duration)
+      : TransitionBase(LayerAnimationElement::BOUNDS, duration),
+        target_(target) {
+  }
+  virtual ~BoundsTransition() {}
+
+ protected:
+  virtual void OnProgress(double t, LayerAnimationDelegate* delegate) {
+    if (first_frame())
+      start_ = delegate->GetBoundsForAnimation();
+    delegate->SetBoundsFromAnimation(Tween::ValueBetween(t, start_, target_));
+  }
+
+ private:
+  gfx::Rect start_;
+  gfx::Rect target_;
+};
+
+class OpacityTransition : public TransitionBase {
+ public:
+  OpacityTransition(float target, base::TimeDelta duration)
+      : TransitionBase(LayerAnimationElement::OPACITY, duration),
+        target_(target) {
+  }
+  virtual ~OpacityTransition() {}
+
+ protected:
+  virtual void OnProgress(double t, LayerAnimationDelegate* delegate) {
+    if (first_frame())
+      start_ = delegate->GetOpacityForAnimation();
+    delegate->SetOpacityFromAnimation(Tween::ValueBetween(t, start_, target_));
+  }
+
+ private:
+  float start_;
+  float target_;
+
+  DISALLOW_COPY_AND_ASSIGN(OpacityTransition);
+};
+
+class Pause : public TransitionBase {
+ public:
+  Pause(LayerAnimationElement::AnimatableProperty property,
+        base::TimeDelta duration)
+      : TransitionBase(property, duration) {
+  }
+  virtual ~Pause() {}
+
+ protected:
+  virtual void OnProgress(double t, LayerAnimationDelegate* delegate) {}
+
+ private:
+  float start_;
+  float target_;
+
+  DISALLOW_COPY_AND_ASSIGN(Pause);
+};
+
+}  // namespace
+
+/* static */
+LayerAnimationElement* LayerAnimationElement::CreateTransformElement(
+    const Transform& transform, base::TimeDelta duration) {
+  return new TransformTransition(transform, duration);
+}
+
+/* static */
+LayerAnimationElement* LayerAnimationElement::CreateBoundsElement(
+    const gfx::Rect& bounds, base::TimeDelta duration) {
+  return new BoundsTransition(bounds, duration);
+}
+
+/* static */
+LayerAnimationElement* LayerAnimationElement::CreateOpacityElement(
+    float opacity, base::TimeDelta duration) {
+  return new OpacityTransition(opacity, duration);
+}
+
+/* static */
+LayerAnimationElement* LayerAnimationElement::CreatePauseElement(
+    AnimatableProperty property, base::TimeDelta duration) {
+  return new Pause(property, duration);
+}
+
+}  // namespace ui