Window Preview Key Events : Window « Windows Presentation Foundation « VB.Net

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VB.Net » Windows Presentation Foundation » WindowScreenshots 
Window Preview Key Events
Window Preview Key Events
    

<Window x:Class="RoutedEvents.TunneledKeyPress"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="TunneledKeyPress" Height="400" Width="400" PreviewKeyDown="SomeKeyPressed" >
  <StackPanel>
    <Label Margin="5" BorderBrush="Black" BorderThickness="1" HorizontalContentAlignment="Stretch"
           PreviewKeyDown="SomeKeyPressed">
      <StackPanel PreviewKeyDown="SomeKeyPressed">
        <TextBlock Margin="3" HorizontalAlignment="Center" PreviewKeyDown="SomeKeyPressed">
          Image and text label
        </TextBlock>
        <Image Source="c:\image.jpg" Stretch="None" PreviewKeyDown="SomeKeyPressed"/>
        <DockPanel Margin="10" PreviewKeyDown="SomeKeyPressed"
          <TextBlock Margin="3" PreviewKeyDown="SomeKeyPressed">Type here:</TextBlock>
          <TextBox PreviewKeyDown="SomeKeyPressed" KeyDown="SomeKeyPressed"></TextBox>
        </DockPanel>
      </StackPanel>
    </Label>
    <ListBox Margin="5" Name="lstMessages"></ListBox>
    <CheckBox Margin="5" Name="chkHandle">Handle first event</CheckBox>
    <Button Click="cmdClear_Click" HorizontalAlignment="Right" Margin="5" Padding="3">Clear List</Button>
  </StackPanel>
</Window>

//File:Window.xaml.vb
Imports System
Imports System.Collections.Generic
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.Shapes

Namespace RoutedEvents
  Public Partial Class TunneledKeyPress
    Inherits System.Windows.Window
    Public Sub New()
      InitializeComponent()
    End Sub

    Protected eventCounter As Integer = 0

    Private Sub SomeKeyPressed(sender As Object, e As RoutedEventArgs)
      eventCounter += 1
      Dim message As String = "#" & eventCounter.ToString() ":" & vbCr & vbLf & " Sender: " & sender.ToString() & vbCr & vbLf & " Source: " & Convert.ToString(e.Source& vbCr & vbLf & " Original Source: " & Convert.ToString(e.OriginalSource& vbCr & vbLf & " Event: " & Convert.ToString(e.RoutedEvent)
      lstMessages.Items.Add(message)
      e.Handled = CBool(chkHandle.IsChecked)
    End Sub

    Private Sub cmdClear_Click(sender As Object, e As RoutedEventArgs)
      eventCounter = 0
      lstMessages.Items.Clear()
    End Sub
  End Class
End Namespace

   
    
    
    
  
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