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// Copyright 2015 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 "base/macros.h"
#include "ui/app_list/app_list_export.h"
#include "ui/gfx/animation/animation_delegate.h"
#include "ui/gfx/animation/slide_animation.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/shadow_value.h"
namespace app_list {
namespace test {
class ImageShadowAnimatorTest;
} // namespace test
// A helper class that animates an image's shadow between two shadow values.
class APP_LIST_EXPORT ImageShadowAnimator : public gfx::AnimationDelegate {
class Delegate {
// Called when |shadow_image_| is updated.
virtual void ImageShadowAnimationProgressed(
ImageShadowAnimator* animator) = 0;
explicit ImageShadowAnimator(Delegate* delegate);
~ImageShadowAnimator() override;
// Sets the image that will have its shadow animated. Synchronously calls the
// Delegate's ImageShadowAnimationProgressed() method.
void SetOriginalImage(const gfx::ImageSkia& image);
// Sets the shadow values to animate between.
void SetStartAndEndShadows(const gfx::ShadowValues& start_shadow,
const gfx::ShadowValues& end_shadow);
gfx::SlideAnimation* animation() { return &animation_; }
const gfx::ImageSkia& shadow_image() const { return shadow_image_; }
// Overridden from gfx::AnimationDelegate:
void AnimationProgressed(const gfx::Animation* animation) override;
friend test::ImageShadowAnimatorTest;
// Returns shadow values for a tween between |start_shadow_| and |end_shadow_|
// at |progress|.
gfx::ShadowValues GetShadowValuesForProgress(double progress) const;
// Updates |shadow_image_| and notifies the delegate.
void UpdateShadowImageForProgress(double progress);
Delegate* const delegate_;
// The image to paint a drop shadow for.
gfx::ImageSkia original_image_;
// The image with a drop shadow painted. This stays current with the progress
// of |animation_|.
gfx::ImageSkia shadow_image_;
// The animation that controls the progress of the shadow tween.
gfx::SlideAnimation animation_;
// The shadow value to tween from.
gfx::ShadowValues start_shadow_;
// The shadow value to tween to.
gfx::ShadowValues end_shadow_;
} // namespace app_list