protected IVisual TestHit(Point p, int hitSize, Func <IVisual, Point, int, bool> hitTest)
{
if (p == _noHit)
{
return(null);
}
if ((Focused != null) && hitTest(Focused, p, hitSize))
{
return(Focused);
}
if ((Hovered != null) && hitTest(Hovered, p, hitSize))
{
return(Hovered);
}
int halfSize = hitSize / 2;
var hitBounds = new Rectangle(p.X - halfSize, p.Y - halfSize, hitSize, hitSize);
foreach (var visual in SpatialIndex.Query(hitBounds, ZOrder.EdgesFirst))
{
if ((visual == Focused) || (visual == Hovered))
{
continue;
}
if (hitTest(visual, p, hitSize))
{
return(visual);
}
}
_noHit = p;
return(null);
}