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      1 /*
      2  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  *
     25  */
     26 
     27 #include "config.h"
     28 #include "core/frame/SuspendableTimer.h"
     29 
     30 namespace WebCore {
     31 
     32 SuspendableTimer::SuspendableTimer(ExecutionContext* context)
     33     : ActiveDOMObject(context)
     34     , m_nextFireInterval(0)
     35     , m_repeatInterval(0)
     36     , m_active(false)
     37 #if ASSERT_ENABLED
     38     , m_suspended(false)
     39 #endif
     40 {
     41 }
     42 
     43 SuspendableTimer::~SuspendableTimer()
     44 {
     45 }
     46 
     47 bool SuspendableTimer::hasPendingActivity() const
     48 {
     49     return isActive();
     50 }
     51 
     52 void SuspendableTimer::stop()
     53 {
     54     TimerBase::stop();
     55 }
     56 
     57 void SuspendableTimer::suspend()
     58 {
     59 #if ASSERT_ENABLED
     60     ASSERT(!m_suspended);
     61     m_suspended = true;
     62 #endif
     63     m_active = isActive();
     64     if (m_active) {
     65         m_nextFireInterval = nextUnalignedFireInterval();
     66         m_repeatInterval = repeatInterval();
     67         TimerBase::stop();
     68     }
     69 }
     70 
     71 void SuspendableTimer::resume()
     72 {
     73 #if ASSERT_ENABLED
     74     ASSERT(m_suspended);
     75     m_suspended = false;
     76 #endif
     77     // FIXME: FROM_HERE is wrong here.
     78     if (m_active)
     79         start(m_nextFireInterval, m_repeatInterval, FROM_HERE);
     80 }
     81 
     82 } // namespace WebCore
     83