Button CommandTarget Binding : Command « Windows Presentation Foundation « VB.Net Tutorial

1. VB.Net Tutorial
2. Windows Presentation Foundation
3. Command

<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="Custom RoutedCommand Sample"
    Name="RootWindow" Height="500" Width="600"
    Focusable="True">
  <Window.CommandBindings>
    <CommandBinding Command="{x:Static custom:Window1.ColorCmd}"
                    Executed="ColorCmdExecuted"
                    CanExecute="ColorCmdCanExecute"/>
  </Window.CommandBindings>
  <DockPanel>
    <Menu DockPanel.Dock="Top" Height="25">
      <MenuItem Header="Commands">
        <MenuItem Header="Color Command" Command="{x:Static custom:Window1.ColorCmd}" />
      </MenuItem>
    </Menu>
    <Border BorderBrush="Black" BorderThickness="1" Margin="10"
            Height="165" Width="250" DockPanel.Dock="Top">
      <TextBlock TextWrapping="Wrap" Margin="3">
        a
        <LineBreak/>
        b
        <LineBreak/>
        <LineBreak/>
        c
        <LineBreak/>
      </TextBlock>
    </Border>
    <StackPanel Orientation="Horizontal" HorizontalAlignment="Center" DockPanel.Dock="Bottom">
      <Border BorderBrush="Black" BorderThickness="1" Height="200" Width="200">
        <StackPanel Name="FirstStackPanel" Background="AliceBlue" Focusable="True">
          <StackPanel.CommandBindings>
            <CommandBinding Command="{x:Static custom:Window1.ColorCmd}" Executed="ColorCmdExecuted" CanExecute="ColorCmdCanExecute"/>
          </StackPanel.CommandBindings>

          <Label>StackPanel</Label>

          <Button Command="{x:Static custom:Window1.ColorCmd}"
                  CommandParameter="ButtonOne"
                  CommandTarget="{Binding ElementName=FirstStackPanel}" 
                  Content="CommandTarget = FristStackPanel" />
        </StackPanel>
      </Border>
      <Border BorderBrush="Black" BorderThickness="1" Height="200" Width="200">
        <StackPanel Background="AliceBlue" Focusable="True">
          <Label>Second StackPanel</Label>
        </StackPanel>
      </Border>
    </StackPanel>
  </DockPanel>
</Window>

//File:Window.xaml.vb


Imports System
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Media
Imports System.Windows.Input


Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Public Shared ColorCmd As New RoutedCommand()
    Public Sub New()
      InitializeComponent()
    End Sub
    Private Sub ColorCmdExecuted(sender As Object, e As ExecutedRoutedEventArgs)
      Dim target As Panel = TryCast(e.Source, Panel)
      If target IsNot Nothing Then
        If target.Background Is Brushes.AliceBlue Then
          target.Background = Brushes.Red
        Else
          target.Background = Brushes.AliceBlue
        End If
      End If
    End Sub
    Private Sub ColorCmdCanExecute(sender As Object, e As CanExecuteRoutedEventArgs)
      If TypeOf e.Source Is Panel Then
        e.CanExecute = True
      Else
        e.CanExecute = False
      End If
    End Sub
  End Class
End Namespace

16.89.Command
	16.89.1.	Invoking Copy command with a Button
	16.89.2.	Button CommandTarget Binding
	16.89.3.	Creating CommandBinding and attaching an Executed and CanExecute handler
	16.89.4.	Command Handler Command Binding in Xaml
	16.89.5.	Property changed callback
	16.89.6.	Using CommandBinding and ExecutedRoutedEventHandler to bind Application event to an event handler method
	16.89.7.	Create CommandBindings in Xaml and bind to Button
	16.89.8.	Bind TextBox save command to CommandBinding
	16.89.9.	Press F1 to get help
	16.89.10.	Help command
	16.89.11.	Command Enabling