private void List_DragOver(object sender, DragEventArgs e)
{
e.Effects = DragDropEffects.None;
Tuple <ListViewItem, List <CodeMember> > dropTargetInfo = this.GetDropTargetInfo(e);
if (dropTargetInfo != null)
{
e.Effects = e.AllowedEffects;
LineDropTargetAdorner adorner = this.GetAdorner(true);
ListViewItem item = dropTargetInfo.Item1;
double position = this.list.PointFromScreen(item.PointToScreen(default(Point))).Y;
position += IsInBottomHalfOfItem(e, item) ? item.ActualHeight : -1;
// Our adorner won't be clipped, so we need to draw it short enough to not overlap the scroll bar, etc.
ScrollViewer viewer = GetVisualChild <ScrollViewer>(this.list);
double scrollBarWidth = viewer.ComputedVerticalScrollBarVisibility == Visibility.Visible ? SystemParameters.VerticalScrollBarWidth : 0;
double width = Math.Min(item.ActualWidth, viewer.ActualWidth - scrollBarWidth);
adorner.Show(position, width);
}
else
{
LineDropTargetAdorner adorner = this.GetAdorner(false);
if (adorner != null)
{
adorner.Hide();
}
}
// We have to indicate that we've handled the DragOver and set the desired Effects.
// This tells the system it doesn't need to use the default DragOver handler, and it lets
// the default GiveFeedback handler show the proper cursor when dropping isn't allowed.
e.Handled = true;
}
private void ClearDragMembers()
{
this.dragStart = null;
LineDropTargetAdorner adorner = this.GetAdorner(false);
if (adorner != null)
{
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this.list);
adornerLayer.Remove(adorner);
}
}
private void List_DragOver(object sender, DragEventArgs e)
{
e.Effects = DragDropEffects.None;
Tuple <ListViewItem, List <CodeMember> > dropTargetInfo = this.GetDropTargetInfo(e);
if (dropTargetInfo != null)
{
e.Effects = e.AllowedEffects;
LineDropTargetAdorner adorner = this.GetAdorner(true);
ListViewItem item = dropTargetInfo.Item1;
double position = this.list.PointFromScreen(item.PointToScreen(default)).Y;
private LineDropTargetAdorner GetAdorner(bool createIfNecessary)
{
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this.list);
LineDropTargetAdorner result = (adornerLayer.GetAdorners(this.list) ?? Enumerable.Empty <Adorner>())
.OfType <LineDropTargetAdorner>().FirstOrDefault();
if (result == null && createIfNecessary)
{
result = new LineDropTargetAdorner(this.list);
adornerLayer.Add(result);
}
return(result);
}
