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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading;
namespace Xamarin.Forms
{
internal class Ticker
{
static Ticker s_ticker;
readonly Stopwatch _stopwatch;
readonly SynchronizationContext _sync;
readonly List<Tuple<int, Func<long, bool>>> _timeouts;
readonly ITimer _timer;
int _count;
bool _enabled;
internal Ticker()
{
_sync = SynchronizationContext.Current;
_count = 0;
_timer = Device.PlatformServices.CreateTimer(HandleElapsed, null, Timeout.Infinite, Timeout.Infinite);
_timeouts = new List<Tuple<int, Func<long, bool>>>();
_stopwatch = new Stopwatch();
}
public static Ticker Default
{
internal set { s_ticker = value; }
get { return s_ticker ?? (s_ticker = new Ticker()); }
}
public virtual int Insert(Func<long, bool> timeout)
{
_count++;
_timeouts.Add(new Tuple<int, Func<long, bool>>(_count, timeout));
if (!_enabled)
{
_enabled = true;
Enable();
}
return _count;
}
public virtual void Remove(int handle)
{
Device.BeginInvokeOnMainThread(() =>
{
_timeouts.RemoveAll(t => t.Item1 == handle);
if (!_timeouts.Any())
{
_enabled = false;
Disable();
}
});
}
protected virtual void DisableTimer()
{
_timer.Change(Timeout.Infinite, Timeout.Infinite);
}
protected virtual void EnableTimer()
{
_timer.Change(16, 16);
}
protected void SendSignals(int timestep = -1)
{
long step = timestep >= 0 ? timestep : _stopwatch.ElapsedMilliseconds;
_stopwatch.Reset();
_stopwatch.Start();
var localCopy = new List<Tuple<int, Func<long, bool>>>(_timeouts);
foreach (Tuple<int, Func<long, bool>> timeout in localCopy)
{
bool remove = !timeout.Item2(step);
if (remove)
_timeouts.RemoveAll(t => t.Item1 == timeout.Item1);
}
if (!_timeouts.Any())
{
_enabled = false;
Disable();
}
}
void Disable()
{
_stopwatch.Reset();
DisableTimer();
}
void Enable()
{
_stopwatch.Start();
EnableTimer();
}
void HandleElapsed(object state)
{
if (_timeouts.Count > 0)
{
_sync.Post(o => SendSignals(), null);
_stopwatch.Reset();
_stopwatch.Start();
}
}
}
}
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