Binding WPF Events to MVVM ViewModel Commands in code behind of View

Question

I got the below solution in XAML side to bind an event to command and it works just fine.

References

xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"

Button Definition :

<Button>
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="MouseEnter" >
            <i:InvokeCommandAction Command="{Binding FooCommand}" />
        </i:EventTrigger>
    </i:Interaction.Triggers>
</Button>

Problem: Now I need to do the same thing in code behind for my object which is a FrameworkElementFactory but I can't figure it out , I thought maybe some one can help me.

here is where I stopped:

        FrameworkElementFactory newLabel = new FrameworkElementFactory(typeof(Label));
        newLabel.SetValue(Label.BackgroundProperty, Brushes.DarkMagenta);

        var eventTrigger = new System.Windows.Interactivity.EventTrigger("MouseDown");
        var invokeCommandAction = new System.Windows.Interactivity.InvokeCommandAction()
            {
                CommandName = "FooCommand",
                CommandParameter = new Object()
            };

any help please?

Thanks in advance , Farzad

brunnerh · Accepted Answer · 2011-08-31 11:23:39Z

1

Not quite sure if this is the only way but you could probably add the trigger on-load by using Interaction.GetTriggers:

//<Your other code>
eventTrigger.Actions.Add(invokeCommandAction);

RoutedEventHandler loadedHandler = null;
loadedHandler = new RoutedEventHandler((s, _) =>
 {
     var label = s as Label;
     var triggers = Interaction.GetTriggers(label);
     triggers.Add(eventTrigger);
     label.Loaded -= loadedHandler;
 });
newLabel.AddHandler(FrameworkElement.LoadedEvent, loadedHandler);

edited Aug 31, 2011 at 11:23

answered Aug 31, 2011 at 11:13

brunnerh

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