WPF NotifyIcon : Public Release

-------------------------------
CHG   Common cleanup, copyright etc.
DEL   Removed unused dependency property change handlers.
ADD   Added ResetBalloonCloseTimer method which keeps custom balloons open.
ADD   Provided implementation for attached BalloonClosingEvent.

git-svn-id: https://svn.evolvesoftware.ch/repos/evolve.net/WPF/NotifyIcon@94 9f600761-6f11-4665-b6dc-0185e9171623

Source/Sample Project/FancyBalloon.xaml.cs

@@ -4,10 +4,12 @@ using System.Linq;
 using System.Text;
 using System.Windows;
 using System.Windows.Controls;
+using System.Windows.Controls.Primitives;
 using System.Windows.Data;
 using System.Windows.Documents;
 using System.Windows.Input;
 using System.Windows.Media;
+using System.Windows.Media.Animation;
 using System.Windows.Media.Imaging;
 using System.Windows.Navigation;
 using System.Windows.Shapes;
@@ -20,6 +22,8 @@ namespace Sample_Project
   /// </summary>
   public partial class FancyBalloon : UserControl
   {
+    private bool isClosing = false;
+
     #region BalloonText dependency property
 
     /// <summary>
@@ -48,6 +52,19 @@ namespace Sample_Project
     public FancyBalloon()
     {
       InitializeComponent();
+      TaskbarIcon.AddBalloonClosingHandler(this, OnBalloonClosing);
+    }
+
+
+    /// <summary>
+    /// By subscribing to the <see cref="TaskbarIcon.BalloonClosingEvent"/>
+    /// and setting the "Handled" property to true, we suppress the popup
+    /// from being closed in order to display the fade-out animation.
+    /// </summary>
+    private void OnBalloonClosing(object sender, RoutedEventArgs e)
+    {
+      e.Handled = true;
+      isClosing = true;
     }
 
 
@@ -61,5 +78,31 @@ namespace Sample_Project
       TaskbarIcon taskbarIcon = TaskbarIcon.GetParentTaskbarIcon(this);
       taskbarIcon.CloseBalloon();
     }
+
+    /// <summary>
+    /// If the users hovers over the balloon, we don't close it.
+    /// </summary>
+    private void grid_MouseEnter(object sender, MouseEventArgs e)
+    {
+      //if we're already running the fade-out animation, do not interrupt anymore
+      //(makes things too complicated for the sample)
+      if (isClosing) return;
+
+      //the tray icon assigned this attached property to simplify access
+      TaskbarIcon taskbarIcon = TaskbarIcon.GetParentTaskbarIcon(this);
+      taskbarIcon.ResetBalloonCloseTimer();
+    }
+
+
+    /// <summary>
+    /// Closes the popup once the fade-out animation completed.
+    /// The animation was triggered in XAML through the attached
+    /// BalloonClosing event.
+    /// </summary>
+    private void OnFadeOutCompleted(object sender, EventArgs e)
+    {
+      Popup pp = (Popup)Parent;
+      pp.IsOpen = false;
+    }
   }
 }