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.cs
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Windows.Annotations;
using System.Windows.Input;
namespace WpfApplication1
{
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
}
private void TextBoxGotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
{
TextBox source = e.Source as TextBox;
if (source != null)
{
source.Background = Brushes.LightBlue;
source.Clear();
}
}
private void TextBoxLostKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
{
TextBox source = e.Source as TextBox;
if (source != null)
{
source.Background = Brushes.White;
}
}
private void SourceTextKeyDown(object sender, KeyEventArgs e)
{
KeyConverter converter = new KeyConverter();
Key target = Key.None;
if (txtTargetKey.Text.Length == 1)
{
target = (Key)converter.ConvertFromString(txtTargetKey.Text);
}
}
}
}
]]>