KeyBinding樣式

Question

我使用類似於RelayCommand的ICommand類以及類似的變體，但是擴展屬性傾向於使用命令。除了將這些屬性設置爲Command設置的一部分之外，我還可以在綁定時使用它們。例如

<UserControl.InputBindings> 
    <KeyBinding Command="{Binding SaveCommand}" Key="{Binding SaveCommand.GestureKey}" Modifiers="{Binding SaveCommand.GestureModifier}" /> 
</UserControl.InputBindings> 

現在我想要做的是有一個風格，利用這一點，像下面的代碼。它不起作用，因爲顯然KeyBinding沒有DataContext。有沒有辦法讓這個綁定或類似的工作？

乾杯，
Berryl

<Style x:Key="KeyBindingStyle" TargetType="{x:Type KeyBinding}"> 
    <Setter Property="Command" Value="{Binding Command}" /> 
    <Setter Property="Gesture" Value="{Binding GestureKey}" /> 
    <Setter Property="Modifiers" Value="{Binding GestureModifier}" /> 
</Style> 

<UserControl.InputBindings> 
    <KeyBinding DataContext="{Binding SaveCommand}" /> 
</UserControl.InputBindings> 

UPDATE

下面是在沿着切斷預定線延伸的鍵綁定該H.B.第一遍與我擴展的Command類的基本結構一起提示。該綁定不會編譯此錯誤：無法在'KeyBindingEx'類型的'CommandReference'屬性上設置'綁定'。 '綁定'只能在DependencyObject的DependencyProperty上設置。

<UserControl.InputBindings> 
    <cmdRef:KeyBindingEx CommandReference="{Binding SaveCommand}"/> 
</UserControl.InputBindings> 

    public class KeyBindingEx : KeyBinding 
{ 
    public static readonly DependencyProperty CommandReferenceProperty = DependencyProperty 
     .Register("VmCommand", typeof(CommandReference), typeof(KeyBindingEx),   
        new PropertyMetadata(new PropertyChangedCallback(OnCommandReferenceChanged))); 

    private static void OnCommandReferenceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { 
     var kb = (KeyBinding) d; 
     var cmdRef = (VmCommand)e.NewValue; 

     kb.Key = cmdRef.GestureKey; 
     kb.Modifiers = cmdRef.GestureModifier; 
     kb.Command = cmdRef; 
    } 

    public CommandReference CommandReference 
    { 
     get { return (CommandReference)GetValue(CommandReferenceProperty); } 
     set { SetValue(CommandReferenceProperty, value); } 
    } 
} 

public class CommandReference : PropertyChangedBase, ICommandReference 
{ 

    public Key GestureKey 
    { 
     get { return _gestureKey; } 
     set 
     { 
      if (_gestureKey == value) return; 

      _gestureKey = value; 
      NotifyOfPropertyChange(() => GestureKey); 
     } 
    } 
    private Key _gestureKey; 

    ... 
} 


public class VmCommand : CommandReference, ICommand 
{ 
    ... 

    public KeyBinding ToKeyBinding() 
    { 
     return new KeyBinding 
       { 
        Command = this, 
        Key = GestureKey, 
        Modifiers = GestureModifier 
       }; 
    } 

} 

Answer 1

在WPF中，你既可以創建一個markup extension其完成所有的任務，爲您或您的子類與應掛鉤您的自定義命令類型的新屬性鍵綁定屬性更改回調，然後再次可以設置其他屬性。現在想不出比這更優雅的東西。