在特定键上使用EventTrigger

问题描述

我想在触摸特定键(例如，空格键)时使用EventTrigger调用命令

I would like to invoke a command using EventTrigger when a particular key is touched (for example, the spacebar key)

目前，我有:

  <i:Interaction.Triggers>
       <i:EventTrigger EventName="KeyDown">
            <i:InvokeCommandAction Command="{Binding DoCommand}" CommandParameter="{BindingText}"/>
       </i:EventTrigger>
  </i:Interaction.Triggers>

现在我如何指定仅当KeyDown与空格键一起出现时才出现这种情况?

Now how can I specify that this should occur only when the KeyDown occurs with the spacebar?

推荐答案

您将必须构建一个自定义触发器来处理该问题:

You would have to build a custom Trigger to handle that:

public class SpaceKeyDownEventTrigger : EventTrigger {

    public SpaceKeyDownEventTrigger() : base("KeyDown") {
    }

    protected override void OnEvent(EventArgs eventArgs) {
        var e = eventArgs as KeyEventArgs;
        if (e != null && e.Key == Key.Space)
            this.InvokeActions(eventArgs);
    }
}

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