Timer.cs

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#region MIT License
/*
 * Copyright (c) 2009 University of Jyväskylä, Department of Mathematical
 * Information Technology.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#endregion
 
/*
 * Authors: Tero Jäntti, Tomi Karppinen, Janne Nikkanen.
 */
 
using System;
 
namespace Jypeli
{
    public sealed class Timer
    {
        #region Events
 
        public event Action Timeout;
 
        #endregion
 
        private static SynchronousList<Timer> timers = new SynchronousList<Timer>();
 
        private bool _enabled = false;
 
        private TimeSpan timeToTrigger = TimeSpan.MaxValue;
        private TimeSpan trigInterval = new TimeSpan( 0, 0, 1 );
        private TimeSpan savedTrigger = TimeSpan.Zero;
        
        private TimeSpan timeToCount = TimeSpan.MaxValue;
        private TimeSpan countInterval = TimeSpan.FromMilliseconds( 10 );
        private TimeSpan savedCount = TimeSpan.Zero;
 
        #region Properties
 
        public bool Enabled
        {
            get { return _enabled; }
            set
            {
                if ( value == _enabled ) return;
                if ( value )
                    Start();
                else
                    Stop();
            }
        }
 
        public bool IgnorePause { get; set; }
 
        public double Interval
        {
            get { return trigInterval.TotalSeconds; }
            set
            {
                if ( value <= 0 ) throw new ArgumentException( "Interval cannot be zero or negative!" );
 
                try
                {
                    trigInterval = TimeSpan.FromSeconds(value);
                }
                catch (OverflowException)
                {
                    // Workaround for overflow when converting TimeSpan.MaxValue to seconds and back again
                    trigInterval = TimeSpan.MaxValue;
                }
 
                if ( Enabled )
                    timeToTrigger = trigInterval;
            }
        }
 
        public double CurrentTime
        {
            get { return SecondCounter.Value; }
            set { SecondCounter.Value = value; }
        }
 
        // /// <summary>
        // /// Ajastimen käynnistysaika.
        // /// </summary>
        //public TimeSpan StartTime { get; private set; }
 
        public DoubleMeter SecondCounter { get; private set; }
 
        public double SecondCounterStep { get; set; }
 
        public IntMeter Times { get; private set; }
 
        public bool TimesLimited
        {
            get { return Times.MinValue == 0; }
            set
            {
                Times.MinValue = value ? 0 : 1;
            }
        }
 
        public object Tag { get; set; }
 
        #endregion
 
        #region Public methods
 
        public Timer()
        {
            SecondCounter = new DoubleMeter( 0 );
            Times = new IntMeter( 1 );
            Times.MinValue = 1;
            Times.MaxValue = 1;
            Enabled = false;
        }
 
        public Timer(double interval) : this()
        {
            Interval = interval;
        }
 
        public Timer(double interval, Action onTimeout) : this(interval)
        {
            Timeout += onTimeout;
        }
 
        public static Timer CreateAndStart(double interval, Action onTimeout)
        {
            Timer t = new Timer(interval, onTimeout);
            t.Start();
            return t;
        }
 
        public static void SingleShot( double seconds, Action onTimeout )
        {
            Timer t = new Timer();
            t.Interval = seconds;
            t.Timeout += onTimeout;
            t.Start( 1 );
        }
 
        public static Action Limit( Action action, double seconds )
        {
            Timer limiter = new Timer();
            bool allowInvoke = true;
 
            limiter.Interval = seconds;
            limiter.LimitTimes( 1 );
            limiter.Timeout += () => allowInvoke = true;
 
            return delegate
            {
                if ( allowInvoke )
                {
                    allowInvoke = false;
                    action();
                    limiter.Start();
                }
            };
        }
        
        public void Start()
        {
            _enabled = true;
            timeToTrigger = trigInterval;
            timeToCount = countInterval;
            timers.Add( this );
        }
 
        public void Start( int times )
        {
            _enabled = true;
            LimitTimes( times );
            timeToTrigger = trigInterval - savedTrigger;
            timeToCount = countInterval - savedCount;
            timers.Add( this );
        }
 
        public void Pause()
        {
            _enabled = false;
            savedTrigger = trigInterval - timeToTrigger;
            savedCount = countInterval - timeToCount;
            timers.Remove( this );
        }
 
        public void Stop()
        {
            _enabled = false;
            savedTrigger = TimeSpan.Zero;
            savedCount = TimeSpan.Zero;
            timers.Remove( this );
        }
 
        public void Reset()
        {
            SecondCounter.Reset();
            Times.Reset();
            timeToTrigger = trigInterval;
        }
 
        private void LimitTimes( int numTimes )
        {
            TimesLimited = true;
            Times.DefaultValue = numTimes;
            Times.MaxValue = numTimes;
            Times.Value = numTimes;
        }
 
        internal static void ClearAll()
        {
            timers.ForEach(t => { t.Enabled = false; });
            timers.Clear();
        }
 
        private static void UpdateTimer( Timer timer, TimeSpan dt )
        {
            if ( !timer.Enabled )
                return;
 
            timer.timeToCount -= dt;
 
            while ( timer.timeToCount.TotalSeconds <= 0 )
            {
                // Count second counter
                timer.timeToCount += timer.countInterval;
                timer.SecondCounter.Value += timer.countInterval.TotalSeconds;
            }
 
            if ( timer.Timeout != null || timer.TimesLimited )
            {
                timer.timeToTrigger -= dt;
 
                while ( timer.timeToTrigger.TotalSeconds <= 0 )
                {
                    // Trigger timeouts
                    timer.timeToTrigger += timer.trigInterval; // TODO: MessageDisplay.MessageTime = TimeSpan.MaxValue; Aiheuttaa tässä kohdassa overflown
 
                    if ( timer.TimesLimited )
                    {
                        if ( --timer.Times.Value <= 0 )
                        {
                            // The timer has executed its maximum times, stop it
                            timer.Stop();
                        }
                    }
 
                    if ( timer.Timeout != null )
                        timer.Timeout();
                }
            }
        }
 
        internal static void UpdateAll( Time time )
        {
            timers.Update( time );
            timers.ForEach( UpdateTimer, time.SinceLastUpdate );
        }
 
        internal static void UpdateAll( Time time, Predicate<Timer> isUpdated )
        {
            timers.Update( time );
 
            foreach ( var timer in timers )
            {
                if ( isUpdated( timer ) )
                    UpdateTimer( timer, time.SinceLastUpdate );
            }
        }
 
        #endregion
    }
}