DispatcherTimer and EventHandler : Event « Windows Presentation Foundation « VB.Net

1. VB.Net
2. Windows Presentation Foundation
3. Event

DispatcherTimer and EventHandler

     


<Window x:Class="Holding.Window2"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="FillingExample" Height="300" Width="300">
  <Canvas>
    <Ellipse Name="myEllipse" Height="100" Fill="Red">
      <Ellipse.Triggers>
        <EventTrigger RoutedEvent="Ellipse.Loaded">
          <BeginStoryboard>
            <Storyboard>
              <DoubleAnimation BeginTime="0:0:2" Duration="0:0:5"
                  Storyboard.TargetProperty="(Ellipse.Width)"
                  From="10" To="300" FillBehavior="Stop" />

            </Storyboard>
          </BeginStoryboard>
        </EventTrigger>
      </Ellipse.Triggers>
    </Ellipse>
  </Canvas>
</Window>
//File:Window.xaml.vb

Imports System
Imports System.Windows
Imports System.Windows.Threading
Imports System.Diagnostics

Namespace Holding
  Public Partial Class Window2
    Inherits Window
    Private t As New DispatcherTimer()
    Private start As DateTime
    Public Sub New()
      InitializeComponent()
      AddHandler t.Tick, New EventHandler(AddressOf OnTimerTick)
      t.Interval = TimeSpan.FromSeconds(0.5)
      t.Start()
      start = DateTime.Now
    End Sub
    Private Sub OnTimerTick(sender As Object, e As EventArgs)
      Dim elapsedTime As TimeSpan = DateTime.Now - start
      Debug.WriteLine((elapsedTime.ToString() & ": ") + myEllipse.Width)
    End Sub
  End Class
End Namespace

   
    
    
    
    
  

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