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// Copyright 2017 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 REMOTING_CLIENT_UI_FLING_ANIMATION_H_
#define REMOTING_CLIENT_UI_FLING_ANIMATION_H_
#include <memory>
#include "base/callback.h"
#include "base/time/tick_clock.h"
#include "remoting/client/ui/fling_tracker.h"
namespace remoting {
// This class helps interpolating the positions of an object with the given
// initial velocity and feeds the change in position back to the callback.
class FlingAnimation {
public:
// arguments are delta_x and delta_y with respect to the positions at previous
// tick.
using FlingCallback = base::Callback<void(float, float)>;
FlingAnimation(float time_constant, const FlingCallback& fling_callback);
~FlingAnimation();
// (Re)starts the fling animation with the given initial velocity.
void SetVelocity(float velocity_x, float velocity_y);
bool IsAnimationInProgress() const;
// Moves forward the animation to catch up with current time. Calls the fling
// callback with the new positions. No-op if fling animation is not in
// progress.
void Tick();
// Aborts the animation.
void Abort();
void SetTickClockForTest(std::unique_ptr<base::TickClock> clock);
private:
FlingTracker fling_tracker_;
FlingCallback fling_callback_;
base::TimeTicks fling_start_time_;
std::unique_ptr<base::TickClock> clock_;
// FlingAnimation is neither copyable nor movable.
FlingAnimation(const FlingAnimation&) = delete;
FlingAnimation& operator=(const FlingAnimation&) = delete;
};
} // namespace remoting
#endif // REMOTING_CLIENT_UI_FLING_ANIMATION_H_