Rebuilding navigated page with new state - user-interface

Question

I have a widget called Classroom, and in this widget has a button that navigattes you to another page called ButtonPage. It has only one button that triggers a function which affects Classroom's state. It works perfectly. But the problem is that I also want to change LightButton's color with the updated state in Classroom widget. Here is codes.
Classroom
class Classroom extends StatefulWidget {
#override
_ClassroomState createState() => _ClassroomState();
}
class _ClassroomState extends State<Classroom> {
bool isLightOn = false;
final List<String> lightColor = ["red", "green", "blue"];
String currentItem = "red";
void onButtonPress() {
setState(() {
isLightOn = isLightOn;
});
}
void selectItem(String selectedItem) {
setState(() {
currentItem = selectedItem;
});
}
Widget build(BuildContext context) {
return Container(
color: Colors.blue,
padding: EdgeInsets.all(5.0),
child: Column(
children: <Widget>[
LightBulb(
isLightOn: isLightOn,
currentItem: currentItem,
),
Container(
child: MaterialButton(
textColor: Colors.white,
color: Colors.blue,
child: Text("Go to button's page"),
onPressed: () {
Navigator.push(context,
MaterialPageRoute<void>(builder: (BuildContext context) {
return ButtonPage(
isLightOn: isLightOn,
onButtonPress: onButtonPress,
);
}));
},
),
),
LightColorSelector(
selectItem: selectItem,
currentItem: currentItem,
lightColor: lightColor,
),
],
),
);
}
}
ButtonPage
class ButtonPage extends StatelessWidget {
final bool isLightOn;
final VoidCallback onButtonPress;
const ButtonPage({this.isLightOn, this.onButtonPress});
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Button Page"),
),
body: Center(
child: Container(
child: LightButton(
isLightOn: isLightOn,
onButtonPress: onButtonPress,
),
)),
);
}
}
LightButton
class LightButton extends StatelessWidget {
final bool isLightOn;
final VoidCallback onButtonPress;
const LightButton({this.isLightOn, this.onButtonPress});
#override
Widget build(BuildContext context) {
return Container(
color: Colors.red,
padding: EdgeInsets.all(5.0),
child: MaterialButton(
materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
color: Colors.blue,
textColor: Colors.white,
child:
isLightOn ?? false ? Text("Turn light off") : Text("Turn light on"),
onPressed: () {
onButtonPress();
},
),
);
}
}
When I click MaterialButton which is labeled as Go to button's page, it navigates me to ButtonPage with isLightOn and onButtonPress variables. In LightButton, when onButtonPress is triggered, it rebuild only previous page. That's why Light Button's label isn't changed. How can I make it affected?