RoutedEvents: Tunneled Key Press : Key Event « Windows Presentation Foundation « VB.Net Tutorial

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

<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

16.90.Key Event
	16.90.1.	Creating a KeyBinding between the Open command and Ctrl-R
	16.90.2.	Command Handler Key Binding
	16.90.3.	Use Keyboard.Focus to set the focus to a Text Field
	16.90.4.	Provide Quick Keyboard Access to Buttons
	16.90.5.	Reading keyboard modifiers
	16.90.6.	Reading individual key state with Keyboard.IsKeyDown
	16.90.7.	Use InputBinding to bind Application commends to Key events
	16.90.8.	Suppress Keyboard and Mouse Events
	16.90.9.	Query Left / Right control key
	16.90.10.	Is Key.CapsLock Toggled
	16.90.11.	Keyboard.IsKeyToggled
	16.90.12.	Query Number lock key
	16.90.13.	Use KeyBinding to bind Key event to TextBox.InputBindings
	16.90.14.	Custom Command by KeyGesture and RoutedUICommand
	16.90.15.	TextBox PreviewKeyDown, PreviewKeyUp, PreviewTextInput, KeyDown, KeyUp and TextChanged events
	16.90.16.	StackPanel PreviewTextInput and PreviewKeyDown
	16.90.17.	If input is not a number do not handle the key event
	16.90.18.	RoutedEvents: Tunneled Key Press
	16.90.19.	On Key Down Handler