Button mouse down preview : Button Event « Windows Presentation Foundation « VB.Net Tutorial

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VB.Net Tutorial » Windows Presentation Foundation » Button Event 
16.7.3.Button mouse down preview
<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="WpfApplication1.Window1"
    Title="Routed Events" Height="400" Width="800">
  
    <Grid Name="contentGrid" Background="Red">
        <Rectangle Name="clickMeRectangle" 
                   Height="70" 
                   Width="70" 
                   Stroke="Black" 
                   Fill="CadetBlue" />
        <Button Name="clickMeButton" 
                Height="23" 
                HorizontalAlignment="Right" 
                VerticalAlignment="Top" 
                Width="70" 
                PreviewMouseDown="Generic_MouseDown" 
                Click="clickMeButton_Click">Click Me</Button>
        <TextBlock Name="outputText" />
    </Grid>
</Window>

//File:Window.xaml.vb
Imports System
Imports System.Collections.Generic
Imports System.Linq
Imports System.Text
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Data
Imports System.Windows.Documents
Imports System.Windows.Input
Imports System.Windows.Media
Imports System.Windows.Media.Imaging
Imports System.Windows.Navigation
Imports System.Windows.Shapes

Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Private Sub Generic_MouseDown(sender As Object, e As MouseButtonEventArgs)
      Console.WriteLine(outputText.Text)
      Console.WriteLine(e.RoutedEvent.Name)
      Console.WriteLine(sender.ToString())
      Console.WriteLine(DirectCast(e.Source, FrameworkElement).Name)
    End Sub

    Private Sub Window_MouseUp(sender As Object, e As MouseButtonEventArgs)
      outputText.Text = outputText.Text
    End Sub

    Private Sub clickMeButton_Click(sender As Object, e As RoutedEventArgs)
      outputText.Text = "Button clicked:" + outputText.Text
    End Sub
  End Class
End Namespace
WPF Button Mouse Down Preview
16.7.Button Event
16.7.1.Button Click event handlerButton Click event handler
16.7.2.Button mouse down eventButton mouse down event
16.7.3.Button mouse down previewButton mouse down preview
16.7.4.Raise exception from button click eventRaise exception from button click event
16.7.5.Button click actionButton click action
16.7.6.Generate Click Events Repeatedly While a Button Is ClickedGenerate Click Events Repeatedly While a Button Is Clicked
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