Play/Pause icon does not change according to the controller

[Rulius]

First of all, thanks for share this application and explain how it works. I'm new in flutter, Is is being very interesting to build my first application.
I found a little problem with the icon Play and Pause. When you paused the crono, the icon should show Play, but it continues showing paused. The onPressed sentences, only applies to the controller and not about the Icon?, do you know way to solve this?
Thanks!!

[Rulius]

Adding the setState works well:

onPressed: () {
setState(() {
if (controladorppal.isAnimating) {
controladorppal.stop();
} else {
controladorppal.reverse(
from: controladorppal.value == 0.0 ? 1.0 : controladorppal.value);
}
});