WPF Interaction triggers in a Style to invoke commands on View Model

Question

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How to add a Blend Behavior in a Style Setter

when I use an interaction trigger in a style, I am getting the following error, 'triggers is not attachable element of type style'. Any explanation what this error actually means and how to solve it.

For reference take a look at MVVM Light toolkit's EventToCommand example.

In this particular case, I am using Timeline control from Infragistics which represents events as EventTitle and when the EventTitle is clicked, I would like to raise the command (Note that Timeline control doesn't define any event like EventTitleClicked). Currently I am able to achieve the functionality by using events and calling my ViewModel method from the code behind, instead I would like to invoke the command directly from xaml.

<Style x:Key="EventTitleTopStyle" TargetType="igTl:EventTitle">
    <!-- The following is not working -->
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="MouseLeftButtonDown">
            <!--<cmd:EventToCommand Command="{Binding MyCommand}" />-->
        </i:EventTrigger>
    </i:Interaction.Triggers>

   <!-- Using event setter instead to achieve the same -->
    <EventSetter Event="MouseLeftButtonDown" Handler="TopTitleMouseLeftButtonDown" />
    ....

score 1 · Answer 1 · answered Apr 22 '11 at 20:30

1

<interactivity:Interaction.Triggers>
     <interactivity:EventTrigger EventName="MouseDoubleClick">
          <behaviours:ExecuteCommandAction Command="{Binding Path=DataContext.YourCommand, RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type UserControl}}}" 
               CommandParameter="{Binding }"/>
     </interactivity:EventTrigger>
</interactivity:Interaction.Triggers>

answered Apr 22 '11 at 20:30

sobby01

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Don't try in style try after your control that would work :) – sobby01 Apr 22 '11 at 20:33
See my above post i have taken a text box and on lost focus event i have bind a command. Make a command on view model – sobby01 Apr 22 '11 at 21:10
Mouse double click event will fire and your command will execute. – sobby01 Apr 22 '11 at 21:14

sobby01 · Answer 2 · 2011-04-22T21:15:03.343

-2

<TextBox x:Name="EditableControlTextBox" Loaded="RoomTextBox_Loaded">
         <interactivity:Interaction.Triggers>
              <interactivity:EventTrigger EventName="LostFocus">
                     <!--<cmd:EventToCommand Command="{Binding MyCommand}" />-->
              </interactivity:EventTrigger>
          </interactivity:Interaction.Triggers>
</TextBox>

edited Apr 22 '11 at 21:15

answered Apr 22 '11 at 21:08

sobby01

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This is beside the point, the asker wants to do it in a style, applying it to a discrete control is trivial. – H.B. Apr 22 '11 at 22:27

WPF Interaction triggers in a Style to invoke commands on View Model

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