protected override void OnResizeStart(UIElement element, ResizableBehavior resizableBehavior)
{
base.OnResizeStart(element, resizableBehavior);
var snapSide = ArtboardSnapEngineUtils.GetResizeSide(resizableBehavior.ResizeInfo.HandleKind);
_snapEngineContext = Canvas.Artboard?.SnapEngine?.CreateContext(new ArtboardSnapEngineContextParameters(element, snapSide));
}
public override IEnumerable <ArtboardSnapSourcePrimitive> GetSnapPrimitives(ArtboardSnapEngineContextParameters parameters)
{
var side = parameters.Side;
var hasLeft = ArtboardSnapEngineUtils.HasLeft(side);
var hasTop = ArtboardSnapEngineUtils.HasTop(side);
var hasRight = ArtboardSnapEngineUtils.HasRight(side);
var hasBottom = ArtboardSnapEngineUtils.HasBottom(side);
if (hasTop && hasLeft)
{
yield return(_topLeft);
}
if (hasTop && hasRight)
{
yield return(_topRight);
}
if (hasBottom && hasRight)
{
yield return(_bottomRight);
}
if (hasBottom && hasLeft)
{
yield return(_bottomLeft);
}
if (hasLeft)
{
yield return(_left);
}
if (hasTop)
{
yield return(_top);
}
if (hasRight)
{
yield return(_right);
}
if (hasBottom)
{
yield return(_bottom);
}
}
public override void SetBoundingBox(UIElement element, Rect rect)
{
if (_snapEngineContext != null)
{
rect = ArtboardSnapEngineUtils.CalcResizeRect(rect, _snapEngineContext.Engine.Snap(new ArtboardSnapParameters(rect, _snapEngineContext)).SnapRect, _snapEngineContext.Parameters.Side);
}
SetPosition(element, rect.TopLeft);
if (element is FrameworkElement frameworkElement)
{
frameworkElement.Width = rect.Width;
frameworkElement.Height = rect.Height;
}
Canvas.ArrangeChild(element, true);
}