PowerToys/WinAlfred/DispatcherExtensions.cs
2014-01-07 19:27:51 +08:00

58 lines
1.7 KiB
C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Threading;
namespace WinAlfred
{
public static class DispatcherExtensions
{
private static Dictionary<string, DispatcherTimer> timers =
new Dictionary<string, DispatcherTimer>();
private static readonly object syncRoot = new object();
public static string DelayInvoke(this Dispatcher dispatcher, string namedInvocation,
Action action, TimeSpan delay,
DispatcherPriority priority = DispatcherPriority.Normal)
{
lock (syncRoot)
{
if (String.IsNullOrEmpty(namedInvocation))
{
namedInvocation = Guid.NewGuid().ToString();
}
else
{
RemoveTimer(namedInvocation);
}
var timer = new DispatcherTimer(delay, priority, (s, e) =>
{
RemoveTimer(namedInvocation);
action();
}, dispatcher);
timer.Start();
timers.Add(namedInvocation, timer);
return namedInvocation;
}
}
public static void CancelNamedInvocation(this Dispatcher dispatcher, string namedInvocation)
{
lock (syncRoot)
{
RemoveTimer(namedInvocation);
}
}
private static void RemoveTimer(string namedInvocation)
{
if (!timers.ContainsKey(namedInvocation)) return;
timers[namedInvocation].Stop();
timers.Remove(namedInvocation);
}
}
}