| // 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_COMPOSITOR_LAYER_ANIMATION_ELEMENT_H_ |
| #define UI_COMPOSITOR_LAYER_ANIMATION_ELEMENT_H_ |
| |
| #include <set> |
| |
| #include "base/time.h" |
| #include "third_party/skia/include/core/SkColor.h" |
| #include "ui/base/animation/tween.h" |
| #include "ui/compositor/compositor_export.h" |
| #include "ui/gfx/rect.h" |
| #include "ui/gfx/transform.h" |
| |
| namespace ui { |
| |
| class InterpolatedTransform; |
| class LayerAnimationDelegate; |
| |
| // 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, |
| VISIBILITY, |
| BRIGHTNESS, |
| GRAYSCALE, |
| COLOR, |
| }; |
| |
| struct COMPOSITOR_EXPORT TargetValue { |
| TargetValue(); |
| // Initializes the target value to match the delegate. NULL may be supplied. |
| explicit TargetValue(const LayerAnimationDelegate* delegate); |
| |
| gfx::Rect bounds; |
| gfx::Transform transform; |
| float opacity; |
| bool visibility; |
| float brightness; |
| float grayscale; |
| SkColor color; |
| }; |
| |
| 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 gfx::Transform& transform, |
| base::TimeDelta duration); |
| |
| // Creates an element that transitions to another in a way determined by an |
| // interpolated transform. The element accepts ownership of the interpolated |
| // transform. NB: at every step, the interpolated transform clobbers the |
| // existing transform. That is, it does not interpolate between the existing |
| // transform and the last value the interpolated transform will assume. It is |
| // therefore important that the value of the interpolated at time 0 matches |
| // the current transform. |
| static LayerAnimationElement* CreateInterpolatedTransformElement( |
| InterpolatedTransform* interpolated_transform, |
| base::TimeDelta duration); |
| |
| // Creates an element that transitions to the given bounds. The caller owns |
| // the return value. |
| static LayerAnimationElement* CreateBoundsElement( |
| const gfx::Rect& bounds, |
| base::TimeDelta duration); |
| |
| // Creates an element that transitions to the given opacity. The caller owns |
| // the return value. |
| static LayerAnimationElement* CreateOpacityElement( |
| float opacity, |
| base::TimeDelta duration); |
| |
| // Creates an element that sets visibily following a delay. The caller owns |
| // the return value. |
| static LayerAnimationElement* CreateVisibilityElement( |
| bool visibility, |
| base::TimeDelta duration); |
| |
| // Creates an element that transitions to the given brightness. |
| // The caller owns the return value. |
| static LayerAnimationElement* CreateBrightnessElement( |
| float brightness, |
| base::TimeDelta duration); |
| |
| // Creates an element that transitions to the given grayscale value. |
| // The caller owns the return value. |
| static LayerAnimationElement* CreateGrayscaleElement( |
| float grayscale, |
| base::TimeDelta duration); |
| |
| // Creates an element that pauses the given properties. The caller owns the |
| // return value. |
| static LayerAnimationElement* CreatePauseElement( |
| const AnimatableProperties& properties, |
| base::TimeDelta duration); |
| |
| // Creates an element that transitions to the given color. The caller owns the |
| // return value. |
| static LayerAnimationElement* CreateColorElement( |
| SkColor color, |
| base::TimeDelta duration); |
| |
| // 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. Returns true if a redraw is required. |
| bool 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_; } |
| |
| Tween::Type tween_type() const { return tween_type_; } |
| void set_tween_type(Tween::Type tween_type) { tween_type_ = tween_type; } |
| |
| protected: |
| // Called once each time the animation element is run before any call to |
| // OnProgress. |
| virtual void OnStart(LayerAnimationDelegate* delegate) = 0; |
| virtual bool OnProgress(double t, LayerAnimationDelegate* delegate) = 0; |
| virtual void OnGetTarget(TargetValue* target) const = 0; |
| virtual void OnAbort() = 0; |
| |
| private: |
| // For debugging purposes, we sometimes alter the duration we actually use. |
| // For example, during tests we often set duration = 0, and it is sometimes |
| // useful to slow animations down to see them more clearly. |
| base::TimeDelta GetEffectiveDuration(const base::TimeDelta& delta); |
| |
| bool first_frame_; |
| const AnimatableProperties properties_; |
| const base::TimeDelta duration_; |
| Tween::Type tween_type_; |
| |
| DISALLOW_COPY_AND_ASSIGN(LayerAnimationElement); |
| }; |
| |
| } // namespace ui |
| |
| #endif // UI_COMPOSITOR_LAYER_ANIMATION_ELEMENT_H_ |