EventTrigger bind to event from DataContext

Question

I'm trying to accomplish something like this:

<DataTemplate.Triggers>
    <EventTrigger RoutedEvent="{Binding MyEvent}">
        <BeginStoryboard Storyboard="{StaticResource MyAnimation}" />
    </EventTrigger>
</DataTemplate.Triggers>

MyEvent is event from my DataContext.

This does not work because RoutedEvent can't be Binding expression. Any idea how to accomplish this? In fact, I need some mix of EventTrigger and DataTrigger...

Solution with Blend SDK:

<Interactivity:Interaction.Triggers>
    <Interactivity:EventTrigger SourceObject="{Binding}" EventName="MyEvent">
        <ei:ControlStoryboardAction ControlStoryboardOption="Play">
            <ei:ControlStoryboardAction.Storyboard>
                <Storyboard>
                    ....
                </Storyboard>
            </ei:ControlStoryboardAction.Storyboard>
        </ei:ControlStoryboardAction>
    </Interactivity:EventTrigger>
</Interactivity:Interaction.Triggers>

why trigger at all? can you not create a command, which starts your storyboard, and call that command's execute from wherever you want? — , Jan 09 '12 at 13:51
Just for clarifying.. Do you want to add custom events that you'll be able to raise manually? — Anatolii Gabuza, Jan 09 '12 at 19:19

score 4 · Accepted Answer · answered Jan 09 '12 at 13:53

4

Using the EventTriggers from Interactivity (Blend SDK) can trigger on any event on any object, the native ones only work for RoutedEvents which you normally only have on controls.

answered Jan 09 '12 at 13:53

H.B.

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ok, but how to set it to bind to event from DataContext? I've been trying a lot and can't make it work... – bkovacic Jan 09 '12 at 17:48
@pedala: Set the `SourceObject` to `{Binding}`, the `EventName` to the name of the event. – H.B. Jan 09 '12 at 17:54
I've been trying that and it didnt work. Now i tried it directly on control and it worked. Probably there's problem because it's inside `DataTemplate`? Where exactly should I put `Interactivity` inside this `DataTemplate`? I've put it inside `Grid` element because I can't put it in the root of `DataTemplate` as I've put `Trigger` in the question.. – bkovacic Jan 09 '12 at 18:03
@pedala: Use the root element of the `DataTemplate` as it needs an object to attach to. – H.B. Jan 09 '12 at 18:05
I was using `SourceName` instead of `SourceObject`. This part is working now. But, when I raise this event, I get exception: `No applicable name scope exists to resolve the name 'MyGrid'.` Any idea what that might be? – bkovacic Jan 09 '12 at 19:09
I solved this exception. I've put `Storyboard` inside `ControlStoryboardAction` instead of using it as a StaticResource. Thank you very much! – bkovacic Jan 09 '12 at 19:28

EventTrigger bind to event from DataContext

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