123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475 |
- // 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_VIEWS_ANIMATION_SCROLL_ANIMATOR_H_
- #define UI_VIEWS_ANIMATION_SCROLL_ANIMATOR_H_
- #include <memory>
- #include "base/memory/raw_ptr.h"
- #include "ui/gfx/animation/animation_delegate.h"
- #include "ui/views/views_export.h"
- namespace gfx {
- class SlideAnimation;
- }
- namespace views {
- class VIEWS_EXPORT ScrollDelegate {
- public:
- // Returns true if the content was actually scrolled, false otherwise.
- virtual bool OnScroll(float dx, float dy) = 0;
- // Called when the contents scrolled by the fling event ended.
- virtual void OnFlingScrollEnded() {}
- protected:
- ~ScrollDelegate() = default;
- };
- class VIEWS_EXPORT ScrollAnimator : public gfx::AnimationDelegate {
- public:
- // The ScrollAnimator does not own the delegate. Uses default acceleration.
- explicit ScrollAnimator(ScrollDelegate* delegate);
- ScrollAnimator(const ScrollAnimator&) = delete;
- ScrollAnimator& operator=(const ScrollAnimator&) = delete;
- ~ScrollAnimator() override;
- // Use this if you would prefer different acceleration than the default.
- void set_acceleration(float acceleration) { acceleration_ = acceleration; }
- // Use this if you would prefer different velocity than the default.
- void set_velocity_multiplier(float velocity_multiplier) {
- velocity_multiplier_ = velocity_multiplier;
- }
- void Start(float velocity_x, float velocity_y);
- void Stop();
- bool is_scrolling() const { return !!animation_.get(); }
- private:
- // Implementation of gfx::AnimationDelegate.
- void AnimationEnded(const gfx::Animation* animation) override;
- void AnimationProgressed(const gfx::Animation* animation) override;
- void AnimationCanceled(const gfx::Animation* animation) override;
- raw_ptr<ScrollDelegate> delegate_;
- float velocity_x_{0.f};
- float velocity_y_{0.f};
- float velocity_multiplier_{1.f};
- float last_t_{0.f};
- float duration_{0.f};
- float acceleration_;
- std::unique_ptr<gfx::SlideAnimation> animation_;
- };
- } // namespace views
- #endif // UI_VIEWS_ANIMATION_SCROLL_ANIMATOR_H_
|