public DragSourceAttacher(UIElement element, DragSourceHelper.DragSource dragData)
{
this.Element = element;
this.DragData = dragData;
this.DragStartPoint = element.PointToScreen(Mouse.GetPosition((IInputElement)element));
element.QueryContinueDrag += new QueryContinueDragEventHandler(this.Element_QueryContinueDrag);
element.GiveFeedback += new GiveFeedbackEventHandler(this.Element_GiveFeedback);
}
private static bool InternalDataOfType <T>(object data, ref T result)
{
DragSourceHelper.DragSource dragSource = data as DragSourceHelper.DragSource;
if (dragSource != null && dragSource.Data is T)
{
result = (T)dragSource.Data;
return(true);
}
if (!(data is T))
{
return(false);
}
result = (T)data;
return(true);
}
public static DragDropEffects DoDragDrop(UIElement dragSource, object data, DragDropEffects allowedEffects)
{
DragSourceHelper.DragSource dragData = new DragSourceHelper.DragSource(data);
using (new DragSourceHelper.DragSourceAttacher(dragSource, dragData))
{
try
{
return(DragDrop.DoDragDrop((DependencyObject)dragSource, (object)dragData, allowedEffects));
}
catch (Exception ex)
{
return(DragDropEffects.None);
}
finally
{
dragData.OnDragFinished((object)dragSource, EventArgs.Empty);
}
}
}
