detach method
- @override
override
Mark this node as detached.
Typically called only from the parent's detach, and by the owner to mark the root of a tree as detached.
Subclasses with children should override this method to first call their inherited detach method, and then detach all their children.
Implementation
@override
void detach() {
_painter?.dispose();
_painter = null;
super.detach();
// Since we're disposing of our painter, we won't receive change
// notifications. We mark ourselves as needing paint so that we will
// resubscribe to change notifications. If we didn't do this, then, for
// example, animated GIFs would stop animating when a DecoratedBox gets
// moved around the tree due to GlobalKey reparenting.
markNeedsPaint();
}