Dragging contents of DataTemplate

[Cameron Molyneux]

I might be trying to do something that we can do but what I would like to do is attached a dragdrop manager to the contents of a datatemplate i display from an autocomplete box

I have the following code

<sdk:AutoCompleteBox KeyDown="searchbox_KeyDown"  telerik:StyleManager.Theme="Metro"  Height="24" HorizontalAlignment="Stretch"  Name="searchbox" BorderThickness="0" VerticalAlignment="Center"
                      VerticalContentAlignment="Center" FontSize="14" FilterMode="Contains" Margin="10,2" ValueMemberBinding="{Binding Path=Code}"
                       >
    <sdk:AutoCompleteBox.ItemTemplate>
         <DataTemplate>
            <StackPanel Orientation="Vertical">
                <TextBlock Width="100" telerikDragDrop:RadDragAndDropManager.AllowDrag="True"  telerikDragDrop:RadDragAndDropManager.DragQuery="TextBlock_DragQuery"  FontSize="15" FontWeight="Bold" Text="{Binding Path=Code}" Foreground="{StaticResource AccentBrush}">
                </TextBlock>
                <TextBlock Width="100" FontSize="10" Text="{Binding Path=Desc}" />
            </StackPanel>
        </DataTemplate>
    </sdk:AutoCompleteBox.ItemTemplate>
</sdk:AutoCompleteBox>

Which i though would let me drag the contents of the textblock but i get the following error

Error 28 The property 'DragQuery' does not exist on the type 'TextBlock' in the XML namespace 'clr-namespace:Telerik.Windows.Controls.DragDrop;assembly=Telerik.Windows.Controls'. D:\Development\UKI\trunk\iLaboratory\Views\iLaboratory.Common.Views\Controls\Menu.xaml 56 112 iLaboratory.Common.Views

I've tried replacing the textblock with a rad control and I still get a similar message

Can somebody advise what I'm doing wrong?

Many thanks

[Pavel Pavlov]

Hello Cameron ,

The reason for getting the error message is that you are trying to set an event handler the way attached properties are usually set.

Silverlight contrary to WPF does not support setting attached events in XAML .

The solution would be to set this in code .

For examle  - handle the loaded event ..

<TextBlock Width="100"
                                   telerik:RadDragAndDropManager.AllowDrag="True"
                                   Loaded="TextBlock_Loaded"

and in the loaded event handler -- subscribe to the drag event :

private void TextBlock_Loaded(object sender, RoutedEventArgs e)
{
    ((TextBlock)sender).AddHandler(RadDragAndDropManager.DropQueryEvent, new EventHandler<DragDropQueryEventArgs>(TextBlock_DragQuery), true);
}

* Please add using Telerik.Windows.Controls to your .cs file. in order to get access to the Telerik Addhandler extension method.


Regards,
Pavel Pavlov
the Telerik team

[Cameron Molyneux]

I knew it had to be something simple

Works a treat.

Many thanks