init method
Implementation
void init({required OverlayState overlayState, required Duration duration}) {
if (closed) return;
if (!mounted) _inited = false;
if (_inited) return;
_overlayState = overlayState;
if (mounted) {
_inited = true;
_controller?.dispose();
_controller =
AnimationController(vsync: overlayState, duration: duration);
controller.addStatusListener(listenStatus);
onCreateOverlayEntry();
}
}