Hi Steven,
You can define a custom
DragCueTemplate and use it in the
DropInfo event handler of the RadDragAndDropManager. This technique is realized in the code snippets below. Please give it a try and let us know if it fits in your scenario.
XAML:
C#:
public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();
radTreeView.AddHandler(RadDragAndDropManager.DragInfoEvent, new EventHandler<DragDropEventArgs>(OnDragInfo));
radTreeView.ExpandAll();
ObservableCollection<DataItem> rootCollection = new ObservableCollection<DataItem>();
GenerateCollection(rootCollection, 4);
radTreeView.ItemsSource = rootCollection;
radTreeView.ExpandAll();
}
private void OnDragInfo(object sender, DragDropEventArgs e)
{
if (e.Options.Status == DragStatus.DragInProgress)
{
var draggedItem = e.Options.Source;
// Create Drag Cue
// 1. Create a ContentControl. It will be used as a DragCue.
ContentControl dragCue = new ContentControl();
// 2. Set the dragged item to the ContentControl's Content property.
dragCue.Content = draggedItem.DataContext;
// 3. Use a DataTemplate to "say" how the dragged item will be displayed.MessageBox.Show("ALO");
dragCue.ContentTemplate = this.Resources["DragCueTemplate"] as DataTemplate;
// 4. Set the ContentControl to the DragDropOptions' DragCue property.
e.Options.DragCue = dragCue;
// The other code follow here
}
}
private void buttonExpand_Click(object sender, RoutedEventArgs e)
{
radTreeView.ExpandAll();
}
public void GenerateCollection(ObservableCollection<DataItem> rootCollection, int levels)
{
if (levels == 0)
{
return;
}
for (int i = 0; i < 3; i++)
{
DataItem item = new DataItem()
{
Name = String.Format("Item " + i)
};
rootCollection.Add(item);
}
foreach (var dataitem in rootCollection)
{
GenerateCollection(dataitem.Children, levels - 1);
}
}
}
public class DataItem
{
public string Name { get; set; }
public ObservableCollection<DataItem> Children { get; set; }
public DataItem()
{
this.Children = new ObservableCollection<DataItem>();
}
}
Greetings,
Petar Mladenov
the Telerik team
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