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134 lines
5.0 KiB
134 lines
5.0 KiB
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2013 - Raw Material Software Ltd.
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Permission is granted to use this software under the terms of either:
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a) the GPL v2 (or any later version)
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b) the Affero GPL v3
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Details of these licenses can be found at: www.gnu.org/licenses
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.juce.com for more information.
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==============================================================================
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*/
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#ifndef JUCE_TIMER_H_INCLUDED
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#define JUCE_TIMER_H_INCLUDED
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//==============================================================================
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/**
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Makes repeated callbacks to a virtual method at a specified time interval.
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A Timer's timerCallback() method will be repeatedly called at a given
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interval. When you create a Timer object, it will do nothing until the
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startTimer() method is called, which will cause the message thread to
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start making callbacks at the specified interval, until stopTimer() is called
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or the object is deleted.
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The time interval isn't guaranteed to be precise to any more than maybe
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10-20ms, and the intervals may end up being much longer than requested if the
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system is busy. Because the callbacks are made by the main message thread,
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anything that blocks the message queue for a period of time will also prevent
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any timers from running until it can carry on.
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If you need to have a single callback that is shared by multiple timers with
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different frequencies, then the MultiTimer class allows you to do that - its
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structure is very similar to the Timer class, but contains multiple timers
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internally, each one identified by an ID number.
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@see HighResolutionTimer, MultiTimer
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*/
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class JUCE_API Timer
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{
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protected:
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//==============================================================================
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/** Creates a Timer.
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When created, the timer is stopped, so use startTimer() to get it going.
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*/
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Timer() noexcept;
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/** Creates a copy of another timer.
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Note that this timer won't be started, even if the one you're copying
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is running.
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*/
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Timer (const Timer& other) noexcept;
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public:
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//==============================================================================
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/** Destructor. */
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virtual ~Timer();
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//==============================================================================
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/** The user-defined callback routine that actually gets called periodically.
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It's perfectly ok to call startTimer() or stopTimer() from within this
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callback to change the subsequent intervals.
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*/
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virtual void timerCallback() = 0;
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//==============================================================================
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/** Starts the timer and sets the length of interval required.
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If the timer is already started, this will reset it, so the
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time between calling this method and the next timer callback
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will not be less than the interval length passed in.
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@param intervalInMilliseconds the interval to use (any values less than 1 will be
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rounded up to 1)
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*/
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void startTimer (int intervalInMilliseconds) noexcept;
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/** Stops the timer.
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No more callbacks will be made after this method returns.
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If this is called from a different thread, any callbacks that may
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be currently executing may be allowed to finish before the method
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returns.
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*/
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void stopTimer() noexcept;
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//==============================================================================
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/** Checks if the timer has been started.
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@returns true if the timer is running.
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*/
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bool isTimerRunning() const noexcept { return periodMs > 0; }
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/** Returns the timer's interval.
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@returns the timer's interval in milliseconds if it's running, or 0 if it's not.
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*/
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int getTimerInterval() const noexcept { return periodMs; }
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//==============================================================================
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/** For internal use only: invokes any timers that need callbacks.
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Don't call this unless you really know what you're doing!
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*/
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static void JUCE_CALLTYPE callPendingTimersSynchronously();
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private:
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class TimerThread;
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friend class TimerThread;
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int countdownMs, periodMs;
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Timer* previous;
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Timer* next;
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Timer& operator= (const Timer&);
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};
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#endif // JUCE_TIMER_H_INCLUDED
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