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using System;
using System.Collections.Concurrent;
using System.Threading;
using CoreAnimation;
using Foundation;
using UIKit;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Platform.iOS
{
internal class CADisplayLinkTicker : Ticker
{
readonly BlockingCollection<Action> _queue = new BlockingCollection<Action>();
CADisplayLink _link;
public CADisplayLinkTicker()
{
var thread = new Thread(StartThread);
thread.Start();
}
internal new static CADisplayLinkTicker Default
{
get { return Ticker.Default as CADisplayLinkTicker; }
}
public void Invoke(Action action)
{
_queue.Add(action);
}
protected override void DisableTimer()
{
if (_link != null)
{
_link.RemoveFromRunLoop(NSRunLoop.Current, NSRunLoop.NSRunLoopCommonModes);
_link.Dispose();
}
_link = null;
}
protected override void EnableTimer()
{
_link = CADisplayLink.Create(() => SendSignals());
_link.AddToRunLoop(NSRunLoop.Current, NSRunLoop.NSRunLoopCommonModes);
}
void StartThread()
{
while (true)
{
var action = _queue.Take();
var previous = UIApplication.CheckForIllegalCrossThreadCalls;
UIApplication.CheckForIllegalCrossThreadCalls = false;
CATransaction.Begin();
action.Invoke();
while (_queue.TryTake(out action))
action.Invoke();
CATransaction.Commit();
UIApplication.CheckForIllegalCrossThreadCalls = previous;
}
}
}
}
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