public void UpdateDrag(DragEventArgs e)
{
var categoryItemsControl = BudgetEditor.CategoryItemsControl;
var categoryItemsScrollViewer = BudgetEditor.CategoryItemsScrollViewer;
var position = e.GetPosition(categoryItemsScrollViewer);
var categoryItemsControlPosition = e.GetPosition(categoryItemsControl);
if (position.Y < 0 || position.X < 0 || position.Y > categoryItemsControl.ActualHeight || position.X > categoryItemsControl.ActualWidth)
{
DragAdorner = null;
DropTargetAdorner = null;
e.Effects = DragDropEffects.None;
e.Handled = true;
return;
}
if (DragAdorner == null)
{
DragAdorner = CreateDragAdorner();
}
var movePosition = e.GetPosition(DragAdorner.AdornedElement);
DragAdorner?.Move(movePosition, new Point(0, 1), ref AdornerMousePosition, ref AdornerSize);
Scroll(categoryItemsScrollViewer, position);
UpdateDropTarget(categoryItemsControl, categoryItemsControlPosition);
e.Effects = DragDropEffects.Move;
e.Handled = true;
}
