Add progress bar

WinAlfred/DispatcherExtensions.cs

@@ -0,0 +1,57 @@
+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);
+        }
+
+    }
+}