この記事では、次の内容について説明します。 イベントのルーティングとビジュアル ツリー コマンドのルーティング コマンドのルーティングに関する問題を回避する ルーティング コマンドの先を行く

この記事では、次のテクノロジを使用しています。 WPF

<Button Name="myButton" Click="myButton_Click">Click Me</Button>

#line 6 "..\..\Window1.xaml"
this.myButton.Click += 
  new System.Windows.RoutedEventHandler(
  this.myButton_Click);

private void myButton_Click(
  object sender, RoutedEventArgs e) { }

<Window>
  <Grid>
    <Button/>
  </Grid>
</Window>

<Window>
  <Grid>
    <Button>
      <StackPanel>
        <Image/>
        <TextBlock/>
      </StackPanel>
    </Button>
  </Grid>
</Window>

private void OnChildElementMouseDown(object sender, 
  MouseButtonEventArgs e) {
  e.Handled = true;
}

m_SomeChildElement.AddHandler(UIElement.MouseDownEvent, 
  (RoutedEventHandler)OnMouseDownCallMeAlways,true);

<Grid Button.Click="myButton_Click">
  <Button Name="myButton" >Click Me</Button>
</Grid>

#line 5 "..\..\Window1.xaml"
((System.Windows.Controls.Grid)(target)).AddHandler(
System.Windows.Controls.Primitives.ButtonBase.ClickEvent, 
new System.Windows.RoutedEventHandler(this.myButton_Click));

<Button Command="ApplicationCommands.Save">Save</Button>

<UserControl ...>
  <UserControl.CommandBindings>
    <CommandBinding Command="ApplicationCommands.Save"    
      CanExecute="OnCanExecute" Executed="OnExecute"/>
  </UserControl.CommandBindings>
  ...
</UserControl>

private void OnCanExecute(object sender, 
  CanExecuteRoutedEventArgs e) {
  e.CanExecute = true;
}

<ToolBar DockPanel.Dock="Top" Height="25">
  <Button Command="ApplicationCommands.Cut">
    <Image Source="cut.png"/>
  </Button>
</ToolBar>

  <Button Command="Save">Save</Button>

  public interface ICommand {
    event EventHandler CanExecuteChanged;
    bool CanExecute(object parameter);
    void Execute(object parameter);
  }

public interface ICommandSource {
  ICommand Command { get; }
  object CommandParameter { get; }
  IInputElement CommandTarget { get; }
}

<Button Command="Save" 
  CommandTarget="{Binding ElementName=uc1}"
  Width="75" Height="25">Save</Button>

<Window x:Class="CustomCommandsDemo.SimpleView" ...>
  <Grid>
    <Button Command="{Binding CookDinnerCommand}" 
      CommandParameter="Dinner is served!" ...>Cook Dinner</Button>
    <Button Click="OnAddHandler" ...>Add Cook Dinner Handler</Button>
  </Grid>
</Window>

public partial class SimpleView : Window {
  SimpleViewPresenter m_Presenter = new SimpleViewPresenter();

  public SimpleView() {
    InitializeComponent();
    DataContext = m_Presenter.Model;
  }

  private void OnAddHandler(object sender, RoutedEventArgs e) {
    m_Presenter.AddCommandHandler();
  }
}