DOMTimer.h 3.14 KB
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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 COMPUTER, 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.
 *
 */

#ifndef DOMTimer_h
#define DOMTimer_h

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#include "ScheduledAction.h"
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#include "SuspendableTimer.h"
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#include <wtf/OwnPtr.h>
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#include <wtf/PassOwnPtr.h>
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namespace WebCore {

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    class Settings;

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    class DOMTimer : public SuspendableTimer {
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        friend class Settings;
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    public:
        virtual ~DOMTimer();
        // Creates a new timer owned by specified ScriptExecutionContext, starts it
        // and returns its Id.
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        static int install(ScriptExecutionContext*, PassOwnPtr<ScheduledAction>, int timeout, bool singleShot);
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        static void removeById(ScriptExecutionContext*, int timeoutId);
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        // ActiveDOMObject
        virtual void contextDestroyed();
        virtual void stop();
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        // Adjust to a change in the ScriptExecutionContext's minimum timer interval.
        // This allows the minimum allowable interval time to be changed in response
        // to events like moving a tab to the background.
        void adjustMinimumTimerInterval(double oldMinimumTimerInterval);
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    private:
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        DOMTimer(ScriptExecutionContext*, PassOwnPtr<ScheduledAction>, int interval, bool singleShot);
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        virtual void fired();
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        double intervalClampedToMinimum(int timeout, double minimumTimerInterval) const;

        // The default minimum allowable timer setting (in seconds, 0.001 == 1 ms).
        // These are only modified via static methods in Settings.
        static double defaultMinTimerInterval() { return s_minDefaultTimerInterval; }
        static void setDefaultMinTimerInterval(double value) { s_minDefaultTimerInterval = value; }

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        int m_timeoutId;
        int m_nestingLevel;
        OwnPtr<ScheduledAction> m_action;
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        int m_originalInterval;
        bool m_shouldForwardUserGesture;
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        static double s_minDefaultTimerInterval;
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    };
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} // namespace WebCore

#endif // DOMTimer_h