private void CleanUpAdorners()
{
if (insertAdorner != null)
{
insertAdorner.Dispose();
insertAdorner = null;
}
}
private void DragEnd()
{
autoScroller.IsEnabled = false;
// Remove the drag adorner from the adorner layer.
CleanUpAdorners();
if (insertAdorner != null)
{
insertAdorner.Dispose();
insertAdorner = null;
}
if (itemMouseIsOver != null)
{
itemMouseIsOver.IsCurrentDropTarget = false;
itemMouseIsOver = null;
}
}
void OnDragOver(object sender, DragEventArgs e)
{
e.Effects = DragDropEffects.None;
e.Handled = true;
// drag over is the only event which returns the position
Point point = e.GetPosition(TreeView);
if (TryScroll(point))
{
return;
}
if (IsMouseOverAdorner(point))
{
return;
}
var itemsPresenter = TreeView.ScrollViewer.Content as ItemsPresenter;
/*
* if (itemsPresenter.InputHitTest(e.GetPosition(itemsPresenter)) == null)
* {
* if (insertAdorner != null) insertAdorner.Dispose();
* return;
* }
*/
if (itemMouseIsOver != null)
{
itemMouseIsOver.IsCurrentDropTarget = false;
}
itemMouseIsOver = GetTreeViewItemUnderMouse(point);
//if (itemMouseIsOver == null) return;
CanInsertReturn canInsertReturn = CanInsert(itemMouseIsOver, e.GetPosition, e.Data);
if (canInsertReturn != null)
{
e.Effects = DragDropEffects.Move;
if (insertAdorner == null)
{
insertAdorner = new InsertAdorner(itemMouseIsOver, new InsertContent {
Before = canInsertReturn.Before
});
}
else
{
insertAdorner.Dispose();
insertAdorner = new InsertAdorner(itemMouseIsOver, new InsertContent {
Before = canInsertReturn.Before
});
}
itemMouseIsOver.IsCurrentDropTarget = false;
}
else
{
if (insertAdorner != null)
{
insertAdorner.Dispose();
insertAdorner = null;
}
if (CanDrop(itemMouseIsOver, e.Data))
{
e.Effects = DragDropEffects.Move;
}
if (itemMouseIsOver != null)
{
itemMouseIsOver.IsCurrentDropTarget = true;
}
}
}