protected override void SourceRectangleFiltered()
{
base.SourceRectangleFiltered();
var horizontalSnapped = HorizontalEdges.Where(EdgeIsSnappedToSnappableHorizontalEdges);
var verticalSnapped = VerticalEdges.Where(EdgeIsSnappedToSnappableVerticalEdges);
var snappedEdges = horizontalSnapped.Concat(verticalSnapped);
UnderlyingSnappedEdges.SynchronizeListTo(snappedEdges.ToList());
}
private void GenerateEdges()
{
HorizontalEdges.Clear();
VerticalEdges.Clear();
foreach (var canvasItem in Items)
{
HorizontalEdges.Add(canvasItem.Left);
HorizontalEdges.Add(canvasItem.Left + canvasItem.Width);
VerticalEdges.Add(canvasItem.Left);
VerticalEdges.Add(canvasItem.Top + canvasItem.Height);
}
}