/// <summary>
/// Move item(s).
/// </summary>
void DragThumb_DragDelta(object sender, DragDeltaEventArgs e)
{
if (!dragStarted)
{
if (Math.Abs(e.HorizontalChange) >= MinDistanceToStart || Math.Abs(e.VerticalChange) >= MinDistanceToStart)
{
Start();
dragStarted = true;
}
}
if (dragStarted)
{
if (diagramDesignerVM == null)
{
return;
}
// update position of the drag adorner
DiagramItemsMovementInfo movementInfo = diagramDesignerVM.CalcMovementInfo(this.selectedItemsVM, e.HorizontalChange, e.VerticalChange);
this.dragAdorner.LeftOffset = movementInfo.HorizontalChange;
this.dragAdorner.TopOffset = movementInfo.VerticalChange;
}
}
/// <summary>
/// Dragging has ended, see if VM is IDiagramDesignerItem and notify of moving end.
/// </summary>
void DragThumb_DragCompleted(object sender, DragCompletedEventArgs e)
{
if (!dragStarted)
{
return;
}
else
{
dragStarted = false;
}
DiagramItemsMovementInfo movementInfo = diagramDesignerVM.CalcMovementInfo(this.selectedItemsVM, e.HorizontalChange, e.VerticalChange);
diagramDesignerVM.MoveElements(selectedItemsVM, movementInfo);
List <DiagramDesignerCanvas> selectionParentCanvases = new List <DiagramDesignerCanvas>();
foreach (DiagramDesignerItem item in selectedItems)
{
/*
* IDiagramItemViewModel designerItem = item.DataContext as IDiagramItemViewModel;
* if (designerItem == null)
* continue;
*
* // apply change
* double left = designerItem.Left + dragAdorner.LeftOffset;
* double top = designerItem.Top + dragAdorner.TopOffset;
* designerItem.Location = new PointD(left, top);
*/
DiagramDesignerCanvas canvas = (item as DiagramDesignerItem).ParentCanvas;
if (canvas != null)
{
if (!selectionParentCanvases.Contains(canvas))
{
selectionParentCanvases.Add(canvas);
}
}
}
// update diagram surfaces
foreach (DiagramDesignerCanvas canvas in selectionParentCanvases)
{
if (canvas != null)
{
canvas.InvalidateMeasure();
}
}
// remove drag adorner
if (this.IsMouseCaptured)
{
this.ReleaseMouseCapture();
}
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(this.diagramDesigner);
if (adornerLayer != null)
{
adornerLayer.Remove(this.dragAdorner);
}
e.Handled = false;
}
