Adding a selection box into an ItemsControl?

Posted by Jens on Stack Overflow See other posts from Stack Overflow or by Jens
Published on 2010-05-26T09:05:51Z Indexed on 2010/05/26 9:11 UTC
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I have a WPF ItemsControl with a Canvas ItemPanel. Drawing from an internal source, it displays lots of automatically generated Rectangles.

As of now, it looks like this:

<Window    
// .. NameSpaces
  >
  <Window.Resources>
    <DataTemplate x:Key="binTemplate">
      <Rectangle x:Name="Rect" VerticalAlignment="Bottom"
                 Canvas.Left="10" StrokeThickness="0">
        // .. Databinding Height, Width, etc
      </Rectangle>
    </DataTemplate>
  </Window.Resources>
  <DockPanel x:Name="LayoutRoot" LastChildFill="True">
      <ItemsControl
          ItemsSource="{Binding Bins}"
          ItemTemplate="{StaticResource binTemplate}">
        <ItemsControl.ItemsPanel>
          <ItemsPanelTemplate>
            <Canvas MouseDown="Canvas_MouseDown" MouseMove="Canvas_MouseMove" MouseUp="Canvas_MouseUp">
              <Rectangle x:Name="Selection" Canvas.Left="0" Canvas.Top="0" Visibility="Hidden" />
            </Canvas>
          </ItemsPanelTemplate>
        </ItemsControl.ItemsPanel>
      </ItemsControl>
  </DockPanel>
</Window>

I now try to implement a selection box, too.. well.. select my Rectangles. =) I tried just adding the box into the ItemsControl PanelTemplate, and controlling it with the Canvas mouse events, but it appears I am not allowed to do so. The error message is "Cannot explicitly modify Children collection of Panel used as ItemsPanel for ItemsControl. ItemsControl generates child elements for Panel."

What is the preferred way to implement such behavior? I thought about overlaying another canvas (using negative Margin) and drawing the selection box in there, but that seems like a bad hack.

Thanks in advance!

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