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/*
* Copyright (C) 2008 Apple 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 INC. ``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 COMPUTER, INC. OR
* 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 "config.h"
#include "core/frame/SuspendableTimer.h"
namespace blink {
namespace {
// The lowest value returned by TimerBase::nextUnalignedFireInterval is 0.0
const double kNextFireIntervalInvalid = -1.0;
}
SuspendableTimer::SuspendableTimer(ExecutionContext* context)
: ActiveDOMObject(context)
, m_nextFireInterval(kNextFireIntervalInvalid)
, m_repeatInterval(0)
#if ENABLE(ASSERT)
, m_suspended(false)
#endif
{
}
SuspendableTimer::~SuspendableTimer()
{
}
bool SuspendableTimer::hasPendingActivity() const
{
return isActive();
}
void SuspendableTimer::stop()
{
m_nextFireInterval = kNextFireIntervalInvalid;
TimerBase::stop();
}
void SuspendableTimer::suspend()
{
#if ENABLE(ASSERT)
ASSERT(!m_suspended);
m_suspended = true;
#endif
if (isActive()) {
m_nextFireInterval = nextUnalignedFireInterval();
ASSERT(m_nextFireInterval >= 0.0);
m_repeatInterval = repeatInterval();
TimerBase::stop();
}
}
void SuspendableTimer::resume()
{
#if ENABLE(ASSERT)
ASSERT(m_suspended);
m_suspended = false;
#endif
if (m_nextFireInterval >= 0.0) {
// start() was called before, therefore location() is already set.
// m_nextFireInterval is only set in suspend() if the Timer was active.
start(m_nextFireInterval, m_repeatInterval, location());
m_nextFireInterval = kNextFireIntervalInvalid;
}
}
} // namespace blink
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