private static void ElementMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
var element = (UIElement)sender;
// find the ReoderListBox parent of the element
var reorderListBox = TreeHelpers.FindParent <ReorderListBox>(element);
if (reorderListBox != null)
{
// find the ItemContainer
FrameworkElement f = TreeHelpers.GetItemContainerFromChildElement(reorderListBox, element) as FrameworkElement;
if (f != null)
{
reorderListBox.BeginDrag(f);
}
}
}
protected override void OnMouseMove(MouseEventArgs e)
{
if (_isDragging && _dragAdorner != null)
{
// update the position of the adorner
var current = e.GetPosition(this);
_dragAdorner.OffsetX = current.X - _mouseDown.X;
_dragAdorner.OffsetY = current.Y - _mouseDown.Y;
// find the item that we are dragging over
var element = InputHitTest(new Point(e.GetPosition(this).X, e.GetPosition(this).Y)) as UIElement;
if (element != null)
{
var itemOver = TreeHelpers.GetItemContainerFromChildElement(this, element) as FrameworkElement;
if (itemOver != null)
{
var p = Mouse.GetPosition(itemOver);
var q = PointToQuadrant(itemOver, p);
if (itemOver != _lastMouseOverItem || q != _lastMouseOverQuadrant)
{
if (q == ReorderQuadrant.BottomLeft || q == ReorderQuadrant.BottomRight)
{
_lastMoveOverPlacement = ReorderPlacement.After;
}
else
{
_lastMoveOverPlacement = ReorderPlacement.Before;
}
PreviewInsert(itemOver, _lastMoveOverPlacement);
_lastMouseOverItem = itemOver;
_lastMouseOverQuadrant = q;
}
}
}
}
base.OnMouseMove(e);
}