ActivePlatformGestureAnimation.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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 * 2.  Redistributions in binary form must reproduce the above copyright
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 *
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 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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#include "config.h"

#include "ActivePlatformGestureAnimation.h"

#include "PlatformGestureCurve.h"
#include "PlatformGestureCurveTarget.h"

#if PLATFORM(CHROMIUM)
#include "TraceEvent.h"
#endif

namespace WebCore {

PassOwnPtr<ActivePlatformGestureAnimation> ActivePlatformGestureAnimation::create(PassOwnPtr<PlatformGestureCurve> curve, PlatformGestureCurveTarget* target)
{
    return adoptPtr(new ActivePlatformGestureAnimation(curve, target));
}

PassOwnPtr<ActivePlatformGestureAnimation> ActivePlatformGestureAnimation::create(PassOwnPtr<PlatformGestureCurve> curve, PlatformGestureCurveTarget* target, double startTime)
{
    return adoptPtr(new ActivePlatformGestureAnimation(curve, target, startTime));
}

ActivePlatformGestureAnimation::~ActivePlatformGestureAnimation()
{
#if PLATFORM(CHROMIUM)
    TRACE_EVENT_ASYNC_END0("input", "GestureAnimation", this);
#endif
}

ActivePlatformGestureAnimation::ActivePlatformGestureAnimation(PassOwnPtr<PlatformGestureCurve> curve, PlatformGestureCurveTarget* target)
    : m_startTime(0)
    , m_waitingForFirstTick(true)
    , m_curve(curve)
    , m_target(target)
{
#if PLATFORM(CHROMIUM)
    TRACE_EVENT_ASYNC_BEGIN1("input", "GestureAnimation", this, "curve", m_curve->debugName());
#endif
}

ActivePlatformGestureAnimation::ActivePlatformGestureAnimation(PassOwnPtr<PlatformGestureCurve> curve, PlatformGestureCurveTarget* target, double startTime)
    : m_startTime(startTime)
    , m_waitingForFirstTick(false)
    , m_curve(curve)
    , m_target(target)
{
#if PLATFORM(CHROMIUM)
    TRACE_EVENT_ASYNC_BEGIN1("input", "GestureAnimation", this, "curve", m_curve->debugName());
#endif
}

bool ActivePlatformGestureAnimation::animate(double time)
{
    if (m_waitingForFirstTick) {
        m_startTime = time;
        m_waitingForFirstTick = false;
    }
    // All PlatformGestureCurves 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 WebCore