Can't get listener value after max/min level

[ahmad-whizpool]

I'm not receiving the listener callback after reaching the maximum or minimum volume. I need to get the callback even when the volume is at max or min because I want to detect volume button presses.
// Calling this in the init method
RealVolume.onVolumeChanged.listen((event) async {
print(
"Current volum pressed ==> ${event.volumeLevel} ${event.streamType}");
});