private static void OnPositionChanged(object sender, PositionChangedEventArgs args)
{
var compoundVertexControl = args.Source as CompoundVertexControl;
if (compoundVertexControl == null || compoundVertexControl._activePositionChangeReaction)
{
return;
}
compoundVertexControl._activePositionChangeReaction = true;
//we are moving the compound vertex itself
if (compoundVertexControl == args.OriginalSource)
{
//move the children with the same amount
foreach (var childVertexControl in compoundVertexControl.Vertices)
{
GraphCanvas.SetX(childVertexControl, GraphCanvas.GetX(childVertexControl) + args.XChange);
GraphCanvas.SetY(childVertexControl, GraphCanvas.GetY(childVertexControl) + args.YChange);
}
}
else
{
//we are moving the parent or one of it's child
var childVertexControl = args.OriginalSource as VertexControl;
if (childVertexControl == null)
{
return;
}
if (compoundVertexControl.Vertices.Contains(childVertexControl))
{
//update the position of all child vertices
foreach (var cvc in compoundVertexControl.Vertices)
{
if (cvc == childVertexControl)
{
continue;
}
var childCenterPos = new Point(cvc.ActualWidth / 2, cvc.ActualHeight / 2);
var translatedChildCenterPos = cvc.TranslatePoint(childCenterPos, cvc.RootCanvas);
GraphCanvas.SetX(cvc, translatedChildCenterPos.X - cvc.RootCanvas.Translation.X);
GraphCanvas.SetY(cvc, translatedChildCenterPos.Y - cvc.RootCanvas.Translation.Y);
}
}
}
compoundVertexControl._activePositionChangeReaction = false;
}
public AnimationContext(GraphCanvas canvas)
{
GraphCanvas = canvas;
}
/// <summary>
/// Initializes a new instance of the <see cref="AnimationContext"/> class.
/// </summary>
/// <param name="canvas">Graph canvas.</param>
public AnimationContext([NotNull] GraphCanvas canvas)
{
GraphCanvas = canvas ?? throw new ArgumentNullException(nameof(canvas));
}
