private void dndPreviewMouseMove(object sender, MouseEventArgs e)
{
Point mousePos = e.GetPosition(this);
Vector diff = dndStartPoint - mousePos;
var headersPresenter = UIWpf.FindVisualChild <DataGridColumnHeadersPresenter>(this);
double headerActualHeight = headersPresenter.ActualHeight;
if (mousePos.Y <= headerActualHeight) // if header
{
e.Handled = false;
return;
}
if (hasButtonBeenDown && isDraggin == false &&
!UIWpf.IsMouseOverScrollbar(sender, dndStartPoint) &&
(e.LeftButton == MouseButtonState.Pressed) && (
(Math.Abs(diff.X) > Dnd.MinimumHorizontalDragDistance) ||
(Math.Abs(diff.Y) > Dnd.MinimumVerticalDragDistance)))
{
isDraggin = true;
RestoreSelectedVertexes();
IVertex dndVertex = MinusZero.Instance.CreateTempVertex();
if (Vertex.Get(@"SelectedEdges:\") != null)
{
foreach (IEdge ee in Vertex.GetAll(@"SelectedEdges:\"))
{
dndVertex.AddEdge(null, ee.To);
}
}
else
{
IVertex v = GetEdgeByLocation(dndStartPoint);
if (v != null)
{
dndVertex.AddEdge(null, v);
}
}
if (dndVertex.Count() > 0)
{
DataObject dragData = new DataObject("Vertex", dndVertex);
dragData.SetData("DragSource", this);
Dnd.DoDragDrop(this, dragData);
e.Handled = true;
}
isDraggin = false;
}
// e.Handled = true;
}
public IVertex GetEdgeByLocation(Point point)
{
var headersPresenter = UIWpf.FindVisualChild <DataGridColumnHeadersPresenter>(ThisDataGrid);
double headerActualHeight = headersPresenter.ActualHeight;
if (point.Y <= headerActualHeight) // if header
{
return(null);
}
foreach (var item in ThisDataGrid.Items)
{
var row = ThisDataGrid.ItemContainerGenerator.ContainerFromItem(item) as DataGridRow;
if (row != null)
{
DataGridRow roww = (DataGridRow)row;
if (VisualTreeHelper.HitTest(roww, TranslatePoint(point, roww)) != null)
{
if (point.X >= ThisDataGrid.Columns.First().ActualWidth&& roww.IsEditing)
{
return(null);
}
IVertex v = MinusZero.Instance.CreateTempVertex();
Edge.AddEdgeEdges(v, (IEdge)roww.Item);
return(v);
}
}
}
// DO WANT THIS FEATURE ?
//
if (GeneralUtil.CompareStrings(MinusZero.Instance.Root.Get(@"User\CurrentUser:\Settings:\AllowBlankAreaDragAndDrop:").Value, "StartAndEnd"))
{
return(Vertex.Get("BaseEdge:"));
}
else
{
return(null);
}
}