File: WebActiveGestureAnimation.cpp

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/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "platform/exported/WebActiveGestureAnimation.h"

#include "public/platform/WebGestureCurve.h"
#include "public/platform/WebGestureCurveTarget.h"
#include "wtf/PtrUtil.h"
#include <memory>

namespace blink {

std::unique_ptr<WebActiveGestureAnimation>
WebActiveGestureAnimation::createAtAnimationStart(
    std::unique_ptr<WebGestureCurve> curve,
    WebGestureCurveTarget* target) {
  return WTF::wrapUnique(
      new WebActiveGestureAnimation(std::move(curve), target, 0, true));
}

std::unique_ptr<WebActiveGestureAnimation>
WebActiveGestureAnimation::createWithTimeOffset(
    std::unique_ptr<WebGestureCurve> curve,
    WebGestureCurveTarget* target,
    double startTime) {
  return WTF::wrapUnique(new WebActiveGestureAnimation(std::move(curve), target,
                                                       startTime, false));
}

WebActiveGestureAnimation::~WebActiveGestureAnimation() {}

WebActiveGestureAnimation::WebActiveGestureAnimation(
    std::unique_ptr<WebGestureCurve> curve,
    WebGestureCurveTarget* target,
    double startTime,
    bool waitingForFirstTick)
    : m_startTime(startTime),
      m_waitingForFirstTick(waitingForFirstTick),
      m_curve(std::move(curve)),
      m_target(target) {}

bool WebActiveGestureAnimation::animate(double time) {
  if (m_waitingForFirstTick) {
    m_startTime = time;
    m_waitingForFirstTick = false;
  }
  // All WebGestureCurves assume zero-based time, so we subtract
  // the animation start time before passing to the curve.
  return m_curve->apply(time - m_startTime, m_target);
}

}  // namespace blink