public override Visual UpdateVisual(IRenderContext context, Visual oldVisual)
{
VisualGroup container = oldVisual as VisualGroup;
if (container == null || container.Children.Count != 1)
{
return(CreateVisual(context));
}
var rectangle = container.Children.ElementAt(0) as Rectangle;
var lastState = container.GetRenderDataCache <PathIconState>();
if (rectangle == null || lastState == null)
{
container.Children.Clear();
return(CreateVisual(context));
}
if (!lastState.Equals(Bounds.Width, Bounds.Height, Pen, Brush))
{
UpdateRectangle(rectangle);
container.SetRenderDataCache(new PathIconState(Bounds.Width, Bounds.Height, Pen, Brush));
}
// arrange
container.SetCanvasArrangeRect(Bounds.ToRectD());
return(container);
}
public override Visual UpdateVisual(IRenderContext context, Visual oldVisual)
{
VisualGroup container = oldVisual as VisualGroup;
if (container == null || container.Children.Count != 1)
{
return(CreateVisual(context));
}
var path = container.Children.ElementAt(0) as Path;
var lastState = container.GetRenderDataCache <PathIconState>();
if (path == null || lastState == null || lastState.width != Bounds.Width || lastState.height != Bounds.Height)
{
return(CreateVisual(context));
}
if (!Equals(lastState.pen, Pen))
{
path.SetPen(Pen);
}
if (!Equals(lastState.brush, Brush))
{
path.Fill = Brush;
}
// arrange visual
container.SetCanvasArrangeRect(Bounds.ToRectD());
return(container);
}