protected virtual void OnPreviewDropTarget(PreviewDropTargetEventArgs e)
{
EventHandler <PreviewDropTargetEventArgs> eh = this.Events[PreviewDropTargetEventKey] as EventHandler <PreviewDropTargetEventArgs>;
if (eh != null)
{
eh(this, e);
}
}
protected virtual void OnPreviewDropTarget(PreviewDropTargetEventArgs e)
{
EventHandler <PreviewDropTargetEventArgs> eventHandler = this.Events[RadDragDropService.PreviewDropTargetEventKey] as EventHandler <PreviewDropTargetEventArgs>;
if (eventHandler == null)
{
return;
}
eventHandler((object)this, e);
}
private ISupportDrop HitTestElementTree(ComponentThemableElementTree elementTree, Point screenMouse, out Point resultDropLocation)
{
if (elementTree == null)
{
resultDropLocation = Point.Empty;
return(null);
}
resultDropLocation = Point.Empty;
Point clientMouse = elementTree.Control.PointToClient(screenMouse);
RadElement hitElement = elementTree.GetElementAtPoint(clientMouse);
ISupportDrag dragInstance = this.Context as ISupportDrag;
ISupportDrop dropTarget = null;
ISupportDrop hitTarget = null;
while (hitElement != null)
{
hitTarget = hitElement as ISupportDrop;
dropTarget = null;
if (hitTarget != null && hitTarget.AllowDrop)
{
RadElement dropTargetElement = hitTarget as RadElement;
if (dropTargetElement != null)
{
resultDropLocation = dropTargetElement.PointFromControl(clientMouse);
}
else
{
resultDropLocation = clientMouse;
}
dropTarget = hitTarget;
}
//raise PreviewDropTarget event
PreviewDropTargetEventArgs args = new PreviewDropTargetEventArgs(dragInstance, hitTarget);
args.DropTarget = dropTarget;
this.OnPreviewDropTarget(args);
dropTarget = args.DropTarget;
if (dropTarget != null)
{
return(dropTarget);
}
hitElement = hitElement.Parent;
}
return(null);
}
private ISupportDrop HitTestElementTree(
ComponentThemableElementTree elementTree,
Point screenMouse,
out Point resultDropLocation)
{
if (elementTree == null)
{
resultDropLocation = Point.Empty;
return((ISupportDrop)null);
}
resultDropLocation = Point.Empty;
Point client = elementTree.Control.PointToClient(screenMouse);
RadElement radElement1 = elementTree.GetElementAtPoint(client);
ISupportDrag context = this.Context as ISupportDrag;
for (; radElement1 != null; radElement1 = radElement1.Parent)
{
ISupportDrop hitTarget = radElement1 as ISupportDrop;
ISupportDrop supportDrop = (ISupportDrop)null;
if (hitTarget != null && hitTarget.AllowDrop)
{
RadElement radElement2 = hitTarget as RadElement;
resultDropLocation = radElement2 == null ? client : radElement2.PointFromControl(client);
supportDrop = hitTarget;
}
PreviewDropTargetEventArgs e = new PreviewDropTargetEventArgs(context, hitTarget);
e.DropTarget = supportDrop;
this.OnPreviewDropTarget(e);
ISupportDrop dropTarget = e.DropTarget;
if (dropTarget != null)
{
return(dropTarget);
}
}
return((ISupportDrop)null);
}
