Mega Code Archive
TextBox focus listener
<![CDATA[
<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:custom="clr-namespace:WpfApplication1"
Title="Keyboard Sample" Height="250" Width="300">
<StackPanel>
<Label Name="lblNumberOfTargetHits" HorizontalAlignment="Center"/>
<TextBox Name="txtTargetKey" GotKeyboardFocus="TextBoxGotKeyboardFocus" LostKeyboardFocus="TextBoxLostKeyboardFocus">A</TextBox>
<TextBox TextWrapping="Wrap" GotKeyboardFocus="TextBoxGotKeyboardFocus" LostKeyboardFocus="TextBoxLostKeyboardFocus" KeyDown="SourceTextKeyDown"/>
</StackPanel>
</Window>
//File:Window.xaml.vb
Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Data
Imports System.Windows.Documents
Imports System.Windows.Media
Imports System.Windows.Media.Imaging
Imports System.Windows.Shapes
Imports System.Windows.Annotations
Imports System.Windows.Input
Namespace WpfApplication1
Public Partial Class Window1
Inherits Window
Public Sub New()
InitializeComponent()
End Sub
Private Sub TextBoxGotKeyboardFocus(sender As Object, e As KeyboardFocusChangedEventArgs)
Dim source As TextBox = TryCast(e.Source, TextBox)
If source IsNot Nothing Then
source.Background = Brushes.LightBlue
source.Clear()
End If
End Sub
Private Sub TextBoxLostKeyboardFocus(sender As Object, e As KeyboardFocusChangedEventArgs)
Dim source As TextBox = TryCast(e.Source, TextBox)
If source IsNot Nothing Then
source.Background = Brushes.White
End If
End Sub
Private Sub SourceTextKeyDown(sender As Object, e As KeyEventArgs)
Dim converter As New KeyConverter()
Dim target As Key = Key.None
If txtTargetKey.Text.Length = 1 Then
target = CType(converter.ConvertFromString(txtTargetKey.Text), Key)
End If
End Sub
End Class
End Namespace
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