/// <summary>
/// Finds the drag container that is the WPF element
/// that holds the DataObject that will be dragged.
/// </summary>
/// <param name="originalSource">
/// The original source where the
/// drag operation started.
/// </param>
/// <returns>
/// The element that holds the DataObject,
/// or null if none can be found.
/// </returns>
static DependencyObject FindDragContainer(DependencyObject originalSource)
{
var element = originalSource.FindParent <DependencyObject>(t =>
{
return(DragDropManager.GetDataObject(t) != null);
});
return(element);
}
static void StartDrag(DependencyObject d, MouseEventArgs e)
{
var sourceItem = DragDropManager.FindDragContainer(( DependencyObject )e.OriginalSource);
DragDropManager.SetIsDragging(d, true);
var obj = DragDropManager.GetDataObject(sourceItem);
var objType = DragDropManager.GetDataObjectType(sourceItem);
DataObject data = null;
if (String.IsNullOrEmpty(objType))
{
data = new DataObject(obj.GetType(), obj);
}
else
{
data = new DataObject(objType, obj);
}
var de = DragDrop.DoDragDrop(d, data, DragDropEffects.Move);
DragDropManager.SetIsDragging(d, false);
}