Routed events - WPF
A routed event is a type of event that can invoke handlers on multiple listeners in an element tree rather than just the object that raised the event.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
<Window x:Class = "WPFRoutedEvents.MainWindow"
xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x = "http://schemas.microsoft.com/winfx/2006/xaml"
Title = "MainWindow" Height = "450" Width = "604" ButtonBase.Click = "Window_Click" >
<Grid>
<StackPanel Margin = "20" ButtonBase.Click = "StackPanel_Click">
<StackPanel Margin = "10">
<TextBlock Name = "txt1" FontSize = "18" Margin = "5" Text = "This is a TextBlock 1" />
<TextBlock Name = "txt2" FontSize = "18" Margin = "5" Text = "This is a TextBlock 2" />
<TextBlock Name = "txt3" FontSize = "18" Margin = "5" Text = "This is a TextBlock 3" />
</StackPanel>
<Button Margin = "10" Content = "Click me" Click = "Button_Click" Width = "80"/>
</StackPanel>
</Grid>
</Window>
Code explained:
Notice the 3 click events: Window_Click, StackPanel_Click, Button_Click
Here is the code-behind:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
using System.Windows;
namespace WPFRoutedEvents {
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window {
public MainWindow() {
InitializeComponent();
}
private void Button_Click(object sender, RoutedEventArgs e) {
txt1.Text = "Button is Clicked";
}
private void StackPanel_Click(object sender, RoutedEventArgs e) {
txt2.Text = "Click event is bubbled to Stack Panel";
}
private void Window_Click(object sender, RoutedEventArgs e) {
txt3.Text = "Click event is bubbled to Window";
}
}
}
Code explained:
When you compile and execute the above code, it will produce the following window
When you click on the button, the text blocks will get updated, as shown below.
