protected override Size OnMeasure(Size size, IRendererContext context)
{
var panelSize = Margin.GetAbsoluteSize() + Padding.GetAbsoluteSize() + Border.AsSpacer().GetAbsoluteSize();
Inner?.Measure((size - panelSize).Union(Size.Empty), context);
return((Inner?.DesiredSize ?? Size.Empty) + panelSize);
}
