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POWPF/MVVM - how to handle double-click on TreeViewItems in the ViewModel?
 

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  1. POWPF/MVVM - how to handle double-click on TreeViewItems in the ViewModel?
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    <p>(Note - this is a re-post as my first question got posted under wrong headline: <a href="https://stackoverflow.com/questions/4484430/in-wpf-mvvm-should-viewmodel-be-involved-in-opening-a-windog-e-g-about-window">Here</a> Sorry!)</p> <p>I have a standard WPF treeview and have bound items to view model classes.</p> <p>I now wish to handle behaviour when items are double-clicked (opening documents visual-studio-style).</p> <p>I can get event-handler to fire in the control housing the treeview (xaml shown), but how do I bind to specific behaviour on the view model classes - e.g. ProjectViewModel?</p> <p>Preferable bound to ICommand-implementer, as this is used elsewhere...</p> <pre><code>&lt;TreeView ItemsSource="{Binding Projects}" MouseDoubleClick="TreeView_MouseDoubleClick"&gt; &lt;TreeView.ItemContainerStyle&gt; &lt;!-- This Style binds a TreeViewItem to a TreeViewItemViewModel. --&gt; &lt;Style TargetType="{x:Type TreeViewItem}"&gt; &lt;Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" /&gt; &lt;Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" /&gt; &lt;Setter Property="FontWeight" Value="Normal" /&gt; &lt;Style.Triggers&gt; &lt;Trigger Property="IsSelected" Value="True"&gt; &lt;Setter Property="FontWeight" Value="Bold" /&gt; &lt;/Trigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;/TreeView.ItemContainerStyle&gt; &lt;TreeView.Resources&gt; &lt;HierarchicalDataTemplate DataType="{x:Type Implementations:ProjectViewModel}" ItemsSource="{Binding Children}"&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;Image Width="16" Height="16" Margin="3,0" Source="Images\Region.png" /&gt; &lt;TextBlock Text="{Binding DisplayName}" /&gt; &lt;/StackPanel&gt; &lt;/HierarchicalDataTemplate&gt; &lt;HierarchicalDataTemplate DataType="{x:Type Implementations:PumpViewModel}" ItemsSource="{Binding Children}"&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;Image Width="16" Height="16" Margin="3,0" Source="Images\State.png" /&gt; &lt;TextBlock Text="{Binding Name}" /&gt; &lt;/StackPanel&gt; &lt;/HierarchicalDataTemplate&gt; &lt;DataTemplate DataType="{x:Type Implementations:PumpDesignViewModel}"&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;Image Width="16" Height="16" Margin="3,0" Source="Images\City.png" /&gt; &lt;TextBlock Text="{Binding Name}" /&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;/TreeView.Resources&gt; &lt;/TreeView&gt; </code></pre>
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    1. COI have viewmodel-objects handling the individual treeitems with regards to display, lazy load etc. However, when I want to 'activate'/double-click an item in the treeview, I'd like this action to be handled by the same viewmodel objects that handle the display - but how do I do that?
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    2. COHave you tried looking at Attached Behaviors?
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    3. COSimilar question using ListView, but answers are control-agnostic http://stackoverflow.com/questions/1035023/firing-a-double-click-event-from-a-wpf-listview-item-using-mvvm/1510592#1510592
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