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

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

Button CommandTarget Binding

    


<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

   
    
    
    
  

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