private static void ensureAdorner(DependencyObject d, Action <StrokeAdorner> action)
{
var tb = d as TextBlock;
if (tb == null)
{
throw new Exception("StrokeAdorner only works on TextBlocks");
}
EventHandler f = null;
f = new EventHandler((o, e) =>
{
var adornerLayer = AdornerLayer.GetAdornerLayer(tb);
if (adornerLayer == null)
{
throw new Exception("AdornerLayer should not be empty");
}
var adorners = adornerLayer.GetAdorners(tb);
var adorner = adorners == null ? null : adorners.OfType <StrokeAdorner>().FirstOrDefault();
if (adorner == null)
{
adorner = new StrokeAdorner(tb);
adornerLayer.Add(adorner);
}
tb.LayoutUpdated -= f;
action(adorner);
});
tb.LayoutUpdated += f;
}
public StrokeTextBlock()
{
_adorner = new StrokeAdorner(this);
this.LayoutUpdated += StrokeTextBlock_LayoutUpdated;
}
