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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;
namespace Xamarin.Forms.Internals
{
public abstract class Ticker
{
static Ticker s_ticker;
readonly Stopwatch _stopwatch;
readonly List<Tuple<int, Func<long, bool>>> _timeouts;
int _count;
bool _enabled;
protected Ticker()
{
_count = 0;
_timeouts = new List<Tuple<int, Func<long, bool>>>();
_stopwatch = new Stopwatch();
}
[EditorBrowsable(EditorBrowsableState.Never)]
public static void SetDefault(Ticker ticker) => Default = ticker;
public static Ticker Default
{
internal set { s_ticker = value; }
get { return s_ticker ?? (s_ticker = Device.PlatformServices.CreateTicker()); }
}
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 abstract void DisableTimer();
protected abstract void EnableTimer();
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();
}
}
}
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