private Point GetRelativeLocation(IEnumerable <WorkflowViewElement> draggedViews)
{
HashSet <WorkflowViewElement> viewElements = new HashSet <WorkflowViewElement>(draggedViews);
if (!viewElements.Contains(this))
{
viewElements.Add(this);
}
Dictionary <WorkflowViewElement, Point> locations = DragDropHelper.GetViewElementRelativeLocations(viewElements);
return(locations[this]);
}
public ViewElementDragShadow(UIElement owner, IEnumerable <WorkflowViewElement> viewElements, Point offset, double scaleFactor)
: base(owner)
{
Dictionary <WorkflowViewElement, Point> locations = DragDropHelper.GetViewElementRelativeLocations(viewElements);
Grid grid = new Grid();
foreach (WorkflowViewElement viewElement in viewElements)
{
Rect bounds = VisualTreeHelper.GetDescendantBounds(viewElement);
Rectangle rectangle = new Rectangle()
{
Width = bounds.Width,
Height = bounds.Height,
Fill = new VisualBrush(viewElement),
Margin = new Thickness(locations[viewElement].X, locations[viewElement].Y, 0, 0),
VerticalAlignment = VerticalAlignment.Top,
HorizontalAlignment = HorizontalAlignment.Left
};
grid.Children.Add(rectangle);
}
grid.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
this.width = grid.DesiredSize.Width;
this.height = grid.DesiredSize.Height;
this.content = new Rectangle()
{
Width = this.width,
Height = this.height,
Fill = new VisualBrush(grid)
{
Opacity = 0.6
}
};
this.InitializeCommon(offset, scaleFactor);
}
