void _didUpdatePainter(CustomPainter newPainter, CustomPainter oldPainter)
{
if (newPainter == null)
{
D.assert(oldPainter != null);
markNeedsPaint();
}
else if (oldPainter == null ||
newPainter.GetType() != oldPainter.GetType() ||
newPainter.shouldRepaint(oldPainter))
{
markNeedsPaint();
}
if (attached)
{
oldPainter?.removeListener(markNeedsPaint);
newPainter?.addListener(markNeedsPaint);
}
}
public override void attach(object owner)
{
base.attach(owner);
_painter?.addListener(markNeedsPaint);
_foregroundPainter?.addListener(markNeedsPaint);
}
