bool IsMouseOver(FrameworkElement target)
{
var bounds = VisualTreeHelper.GetDescendantBounds(target);
var mousePos = MouseUtilities.GetMousePosition(target);
return(bounds.Contains(mousePos));
}
void UpdateDragAdornerLocation()
{
if (_dragAdorner != null)
{
var ptCursor = MouseUtilities.GetMousePosition(ListView);
var left = ptCursor.X - _ptMouseDown.X;
var itemBeingDragged = GetListViewItem(_indexToSelect);
var itemLoc = itemBeingDragged.TranslatePoint(new Point(0, 0), ListView);
var top = itemLoc.Y + ptCursor.Y - _ptMouseDown.Y;
_dragAdorner.SetOffsets(left, top);
}
}
AdornerLayer InitializeAdornerLayer(ListViewItem itemToDrag)
{
var brush = new VisualBrush(itemToDrag);
_dragAdorner = new DragAdorner(_listView, itemToDrag.RenderSize, brush)
{
Opacity = DragAdornerOpacity
};
var layer = AdornerLayer.GetAdornerLayer(_listView);
layer.Add(_dragAdorner);
_ptMouseDown = MouseUtilities.GetMousePosition(_listView);
return(layer);
}
void OnListViewPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (IsMouseOverScrollbar)
{
_canInitiateDrag = false;
return;
}
int index = IndexUnderDragCursor;
_canInitiateDrag = index > -1;
if (_canInitiateDrag)
{
_ptMouseDown = MouseUtilities.GetMousePosition(_listView);
_indexToSelect = index;
}
else
{
_ptMouseDown = new Point(-10000, -10000);
_indexToSelect = -1;
}
}
