Fire an event when an element gains and loses focus. : Focus « Windows Presentation Foundation « C# / C Sharp

1. C# / C Sharp
2. Windows Presentation Foundation
3. Focus

Fire an event when an element gains and loses focus.

  

<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="gotfocusLostfocusEffectUsingEvent" Height="400" Width="450"
    >
  <StackPanel>
    <StackPanel.Resources>
      <Style TargetType="{x:Type Button}">
        <Setter Property="Height" Value="20"/>
        <Setter Property="Width" Value="250"/>
        <Setter Property="HorizontalAlignment" Value="Left"/>
      </Style>
    </StackPanel.Resources>
    <Button
        GotFocus="OnGotFocusHandler"
        LostFocus="OnLostFocusHandler">Click Or Tab To Give Keyboard Focus</Button>
    <Button
        GotFocus="OnGotFocusHandler"
        LostFocus="OnLostFocusHandler">Click Or Tab To Give Keyborad Focus</Button>
  </StackPanel>
</Window>

//File:Window.xaml.cs

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Media;
using System.Windows.Input;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
        private void OnGotFocusHandler(object sender, RoutedEventArgs e)
        {
            Button tb = e.Source as Button;
            tb.Background = Brushes.Red;
        }
        private void OnLostFocusHandler(object sender, RoutedEventArgs e)
        {
            Button tb = e.Source as Button;
            tb.Background = Brushes.White;
        }
    }
}

   
    
  

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