将同一组命令附加/绑定到多个控件

Question

我在Canvas中有一个控件，我希望能够使用箭头键移动它。为了解决问题，我创建了以下课程，这是我想要的。

<Window x:Class="DiagramDesigner.CanvasControlArrowKeyTest" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     Title="CanvasControlArrowKeyTest" Height="300" Width="300"> 
    <Canvas> 
     <Canvas.InputBindings> 
      <KeyBinding Key="Down" Command="MoveDown" /> 
      <KeyBinding Key="Up" Command="MoveUp" /> 
      <KeyBinding Key="Right" Command="MoveRight" /> 
      <KeyBinding Key="Left" Command="MoveLeft" /> 
     </Canvas.InputBindings> 
     <Button> 
      <Button.CommandBindings> 
       <CommandBinding Command="MoveDown" Executed="MoveDown_Executed" /> 
       <CommandBinding Command="MoveUp" Executed="MoveUp_Executed" /> 
       <CommandBinding Command="MoveLeft" Executed="MoveLeft_Executed" /> 
       <CommandBinding Command="MoveRight" Executed="MoveRight_Executed" /> 
      </Button.CommandBindings> 
     </Button> 
    </Canvas> 
</Window> 

这里是后台代码片段：

private void MoveDown_Executed(object sender, ExecutedRoutedEventArgs e) 
{ 
    var uiElement = (UIElement)sender; 
    double value = Canvas.GetTop(uiElement); 
    value = Double.IsNaN(value) ? 0 : value; 
    value++; 
    Canvas.SetTop(uiElement, value < 0 ? 0 : value); 
} 

这一切工作正常，但我真正想要的是具有这种能力，不只是一个一堆按钮。我怎样才能确保每个按钮都有这些CommandBindings？如果有比使用CommandBindings更简单的方法，那可能是什么？

更新：根据要求，这里是另一个似乎并没有工作方法：

<Window x:Class="DiagramDesigner.CanvasControlArrowKeyTest" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     Title="CanvasControlArrowKeyTest" Height="300" Width="300"> 
    <Window.CommandBindings> 
     <CommandBinding Command="MoveDown" Executed="MoveDown_Executed" /> 
     <CommandBinding Command="MoveUp" Executed="MoveUp_Executed" /> 
     <CommandBinding Command="MoveLeft" Executed="MoveLeft_Executed" /> 
     <CommandBinding Command="MoveRight" Executed="MoveRight_Executed" /> 
    </Window.CommandBindings> 
    <Window.InputBindings> 
     <KeyBinding Key="Down" Command="MoveDown" /> 
     <KeyBinding Key="Up" Command="MoveUp" /> 
     <KeyBinding Key="Right" Command="MoveRight" /> 
     <KeyBinding Key="Left" Command="MoveLeft" /> 
    </Window.InputBindings> 
    <Canvas > 
     <Button Width="50" Height="50" /> 
    </Canvas> 
</Window> 

C＃

private void MoveDown_Executed(object sender, ExecutedRoutedEventArgs e) 
{ 
    var uiElement = (UIElement)e.OriginalSource; // Still doesn't point to the Button 
    double value = Canvas.GetTop(uiElement); 
    value = Double.IsNaN(value) ? 0 : value; 
    value++; 
    Canvas.SetTop(uiElement, value < 0 ? 0 : value); 
} 

更新：我放弃了这种做法。我最终使用了一个different solution来解决这个问题，一个不使用命令的问题。

Answer 1

你应该在路由事件处理程序来看一看：http://msdn.microsoft.com/en-us/library/ms742806.aspx

上面的链接有如何做你的要求的例子。

<Border Height="50" Width="300" BorderBrush="Gray" BorderThickness="1"> 
    <StackPanel Background="LightGray" Orientation="Horizontal" Button.Click="CommonClickHandler"> 
    <Button Name="YesButton" Width="Auto" >Yes</Button> 
    <Button Name="NoButton" Width="Auto" >No</Button> 
    <Button Name="CancelButton" Width="Auto" >Cancel</Button> 
    </StackPanel> 
</Border> 

和代码

private void CommonClickHandler(object sender, RoutedEventArgs e) 
{ 
    FrameworkElement feSource = e.Source as FrameworkElement; 
    switch (feSource.Name) 
    { 
    case "YesButton": 
     // do something here ... 
     break; 
    case "NoButton": 
     // do something ... 
     break; 
    case "CancelButton": 
     // do something ... 
     break; 
    } 
    e.Handled=true; 
} 

Answer 2

如果你创建（在这种情况下，窗口）的顶级对象化CommandBindings，你就能够重复使用他们为窗口的任何子女。

<Window x:Class="TesterApp.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     xmlns:data="clr-namespace:TesterApp" 
     x:Name="TheMainWindow" 
     Title="MainWindow" Height="350" Width="525"> 
    <Window.Resources> 
    </Window.Resources> 
    <Window.InputBindings> 
     <KeyBinding Key="A" Command="MoveDown" /> 
    </Window.InputBindings> 
    <Window.CommandBindings> 
     <CommandBinding Command="MoveDown" Executed="MoveDown_Executed" /> 
    </Window.CommandBindings> 
    <Grid> 
     <Button Height="30" Width="80" Content="Click" Command="MoveDown" /> 
    </Grid> 
</Window>