1/* 2 * Copyright (C) 2008, 2013 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 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#ifndef SuspendableTimer_h 28#define SuspendableTimer_h 29 30#include "ActiveDOMObject.h" 31#include "Timer.h" 32 33namespace WebCore { 34 35class SuspendableTimer : private TimerBase, public ActiveDOMObject { 36public: 37 explicit SuspendableTimer(ScriptExecutionContext*); 38 virtual ~SuspendableTimer(); 39 40 // A hook for derived classes to perform cleanup. 41 virtual void didStop(); 42 43 // Part of TimerBase interface used by SuspendableTimer clients, modified to work when suspended. 44 bool isActive() const { return TimerBase::isActive() || (m_suspended && m_savedIsActive); } 45 bool isSuspended() const { return m_suspended; } 46 void startRepeating(double repeatInterval); 47 void startOneShot(double interval); 48 double repeatInterval() const; 49 void augmentFireInterval(double delta); 50 void augmentRepeatInterval(double delta); 51 using TimerBase::didChangeAlignmentInterval; 52 using TimerBase::operator new; 53 using TimerBase::operator delete; 54 55 void cancel(); // Equivalent to TimerBase::stop(), whose name conflicts with ActiveDOMObject::stop(). 56 57private: 58 virtual void fired() = 0; 59 60 // ActiveDOMObject 61 virtual bool hasPendingActivity() const final override; 62 virtual void stop() final override; 63 virtual bool canSuspend() const final override; 64 virtual void suspend(ReasonForSuspension) final override; 65 virtual void resume() final override; 66 67 bool m_suspended; 68 69 double m_savedNextFireInterval; 70 double m_savedRepeatInterval; 71 bool m_savedIsActive; 72}; 73 74} // namespace WebCore 75 76#endif // SuspendableTimer_h 77 78