public virtual void ProcessMouseMove(MouseEventArgs e)
{
if (e.Handled)
{
return;
}
#if DEBUG
this.CheckMouseEventArgs(e);
#endif
if ((this.InitialMousePositionToDragContainerAdorner.HasValue) &&
(e.LeftButton == MouseButtonState.Pressed))
{
if (!this.IsDragging)
{
Point currentPosition = e.GetPosition(this.AdornerLayerInsideDragContainer);
if (DragDropHelper.IsMouseMoveDrag(this.InitialMousePositionToDraggedElement.Value, currentPosition))
{
this.BeginDrag();
}
}
if (this.IsDragging)
{
this.Drag(e);
}
}
}
private void DragMove(Func <IInputElement, Point> getPosition, bool isCreatingCopy)
{
if (!m_initialMousePositionToAdorner.HasValue)
{
return;
}
if (!m_isDragging)
{
var position = getPosition.Invoke(m_adornerLayer);
if (DragDropHelper.IsMouseMoveDrag(m_initialMousePositionToAdorner.Value, position))
{
m_draggedElementGhost = DragSourceManagerBase.CreateDraggedElementGhost(m_draggedElement, isCreatingCopy);
this.OnDragStart(getPosition);
this.IsDragging = true;
}
}
if (m_isDragging)
{
this.OnDragMove(getPosition);
this.UpdateGhost(getPosition);
}
}
internal static IEnumerable <DropTargetInfo> GetDropTargetAtPoint(
UIElement draggedElement,
UIElement container,
MouseEventArgs e)
{
return(DragDropHelper.GetDropTargetAtPoint(draggedElement, container, e.GetPosition));
}
protected virtual IDropTarget GetDropTargetOnDrag(MouseEventArgs e, out Nullable <Point> dropTargetPosition, out IDropTarget lastFoundDropTarget)
{
IDropTarget dropTarget = DragDropHelper.GetDropTargetAtPoint(this.DraggedElement, this.DragContainer, e, out dropTargetPosition, out lastFoundDropTarget);
// ColumnManagerRow was defined as IDropTarget only because Animated Column Reordering required it, ignore it in base class
if (dropTarget is ColumnManagerRow)
{
dropTarget = null;
dropTargetPosition = null;
}
return(dropTarget);
}
protected virtual DropTargetInfo GetDropTarget(Func <IInputElement, Point> getPosition)
{
foreach (var info in DragDropHelper.GetDropTargetAtPoint(this.DraggedElement, this.Container, getPosition))
{
if (!info.CanDrop)
{
continue;
}
// ColumnManagerRow was defined as IDropTarget only because Animated Column Reordering required it, ignore it in base class
if (info.Target is ColumnManagerRow)
{
break;
}
return(info);
}
return(new DropTargetInfo(null, null, false));
}