private bool IsMouseOver(Visual target)
{
var descendantBounds = VisualTreeHelper.GetDescendantBounds(target);
var mousePosition = MouseUtilities.GetMousePosition(target);
return(descendantBounds.Contains(mousePosition));
}
private void OnPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (IsMouseOverScrollbar)
{
_canInitiateDrag = false;
}
else
{
int index = GetIndexUnderDragCursor();
_canInitiateDrag = index > -1;
if (_canInitiateDrag)
{
_mouseDownPosition = MouseUtilities.GetMousePosition(_listView);
_indexToSelect = index;
ConfigureAllowDropToItems(index);
}
else
{
_mouseDownPosition = new Point(-10000, -10000);
_indexToSelect = -1;
}
}
}
private AdornerLayer InitializeAdornerLayer(ListViewItem itemToDrag)
{
var brush = new VisualBrush(itemToDrag);
_dragAdornerLayer = new DragAdornerLayer(this._listView, itemToDrag.RenderSize, brush);
_dragAdornerLayer.Opacity = _dragAdornerLayerOpacity;
var adornerLayer = AdornerLayer.GetAdornerLayer(_listView);
adornerLayer.Add(_dragAdornerLayer);
_mouseDownPosition = MouseUtilities.GetMousePosition(_listView);
return(adornerLayer);
}
private void UpdateDragAdornerLocation()
{
if (_dragAdornerLayer != null)
{
var mousePosition = MouseUtilities.GetMousePosition(_listView);
double left = mousePosition.X - this._mouseDownPosition.X;
var itemBeingDragged = _listView.GetListViewItem(_indexToSelect);
var itemLoc = itemBeingDragged.TranslatePoint(new Point(0, 0), _listView);
double top = itemLoc.Y + mousePosition.Y - _mouseDownPosition.Y;
_dragAdornerLayer.SetOffsets(left, top);
}
}