Source/platform/exported/WebActiveGestureAnimation.cpp

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 * 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
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#include "config.h"
#include "platform/exported/WebActiveGestureAnimation.h"

#include "public/platform/WebGestureCurve.h"
#include "public/platform/WebGestureCurveTarget.h"

namespace WebKit {

PassOwnPtr<WebActiveGestureAnimation> WebActiveGestureAnimation::createAtAnimationStart(PassOwnPtr<WebGestureCurve> curve, WebGestureCurveTarget* target)
{
    return adoptPtr(new WebActiveGestureAnimation(curve, target, 0, true));
}

PassOwnPtr<WebActiveGestureAnimation> WebActiveGestureAnimation::createWithTimeOffset(PassOwnPtr<WebGestureCurve> curve, WebGestureCurveTarget* target, double startTime)
{
    return adoptPtr(new WebActiveGestureAnimation(curve, target, startTime, false));
}

WebActiveGestureAnimation::~WebActiveGestureAnimation()
{
}

WebActiveGestureAnimation::WebActiveGestureAnimation(PassOwnPtr<WebGestureCurve> curve, WebGestureCurveTarget* target, double startTime, bool waitingForFirstTick)
    : m_startTime(startTime)
    , m_waitingForFirstTick(waitingForFirstTick)
    , m_curve(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 WebKit