protected virtual void OnPreviewDragOver(RadDragOverEventArgs e)
{
EventHandler <RadDragOverEventArgs> eh = this.Events[PreviewDragOverEventKey] as EventHandler <RadDragOverEventArgs>;
if (eh != null)
{
eh(this, e);
}
}
protected virtual void OnPreviewDragOver(RadDragOverEventArgs e)
{
EventHandler <RadDragOverEventArgs> eventHandler = this.Events[RadDragDropService.PreviewDragOverEventKey] as EventHandler <RadDragOverEventArgs>;
if (eventHandler == null)
{
return;
}
eventHandler((object)this, e);
}
private void DoDrag(Point mousePt)
{
RadItem draggedElement = this.Context as RadItem;
this.SetHintWindowPosition(mousePt);
Point oldDropLocation = this.dropLocation;
ISupportDrop dropTarget = this.GetDropTarget(Control.MousePosition, out this.dropLocation);
if (dropTarget == null || !this.IsDropTargetValid(dropTarget))
{
Cursor.Current = this.InvalidCursor;
this.doCommit = false;
return;
}
if (dropTarget != null)
{
ISupportDrag draggedContext = this.Context as ISupportDrag;
if (this.target != dropTarget)
{
if (this.target != null)
{
this.target.DragLeave(oldDropLocation, draggedContext);
}
this.target = dropTarget;
this.target.DragEnter(this.dropLocation, draggedContext);
}
this.doCommit = this.target.DragOver(this.dropLocation, draggedContext);
RadDragOverEventArgs args = new RadDragOverEventArgs(draggedContext, this.target);
args.CanDrop = this.doCommit;
this.OnPreviewDragOver(args);
//use the CanDrop member of the event as it may be altered
this.doCommit = args.CanDrop;
if (this.doCommit)
{
//TODO: Provide logic for updating cursor with events and DragDropEffects
Cursor.Current = this.ValidCursor;
}
else
{
Cursor.Current = this.InvalidCursor;
}
}
else
{
this.target = null;
this.doCommit = false;
}
}
private void DoDrag(Point mousePt)
{
object context1 = this.Context;
this.SetHintWindowPosition(mousePt);
Point dropLocation = this.dropLocation;
ISupportDrop dropTarget = this.GetDropTarget(mousePt, out this.dropLocation);
if (dropTarget == null || !this.IsDropTargetValid(dropTarget))
{
Cursor.Current = this.InvalidCursor;
this.doCommit = false;
}
else if (dropTarget != null)
{
ISupportDrag context2 = this.Context as ISupportDrag;
if (this.target != dropTarget)
{
if (this.target != null)
{
this.target.DragLeave(dropLocation, context2);
}
this.target = dropTarget;
this.target.DragEnter(this.dropLocation, context2);
}
this.doCommit = this.target.DragOver(this.dropLocation, context2);
RadDragOverEventArgs e = new RadDragOverEventArgs(context2, this.target);
e.CanDrop = this.doCommit;
this.OnPreviewDragOver(e);
this.doCommit = e.CanDrop;
if (this.doCommit)
{
Cursor.Current = this.ValidCursor;
}
else
{
Cursor.Current = this.InvalidCursor;
}
}
else
{
this.target = (ISupportDrop)null;
this.doCommit = false;
}
}
