private void OnOwnerMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
FinishDrag();
if (!ValidateSelectionDragSource(e.OriginalSource) || AdornerLayer.GetAdornerLayer(Owner) == null)
{
return;
}
Owner.AddHandler(UIElement.MouseMoveEvent, new MouseEventHandler(OnOwnerMouseMove), true);
Owner.LostMouseCapture += OnOwnerLostMouseCapture;
Owner.PreviewMouseUp += OnOwnerPreviewMouseLeftButtonUp;
Owner.LostFocus += OnOwnerLostFocus;
SelectionBoxAdorner = CreateSelectionBoxAdorner(Owner, SelectionBox, e.GetPosition(Owner));
}
private void FinishDrag()
{
Owner.RemoveHandler(UIElement.MouseMoveEvent, new MouseEventHandler(OnOwnerMouseMove));
Owner.LostMouseCapture -= OnOwnerLostMouseCapture;
Owner.PreviewMouseUp -= OnOwnerPreviewMouseLeftButtonUp;
Owner.LostFocus -= OnOwnerLostFocus;
if (SelectionBoxAdorner != null)
{
AdornerLayer parentAdorner = AdornerLayer.GetAdornerLayer(Owner);
if (parentAdorner != null)
{
parentAdorner.Remove(SelectionBoxAdorner);
}
SelectionBoxAdorner.IsRemoved = true;
SelectionBoxAdorner = null;
}
IsSelecting = false;
Owner.ReleaseMouseCapture();
}