Passing route as argument in flutter - flutter

Question

i'm kinda new to flutter and i'm trying to get two buttons on my page and make them send the user to different pages on my app. Right now I have this code for my buttons, but to make it work, I just change the last part of the code from SearchPage() to ScanPage() and this seems to be inefficient. Can I somehow pass in the pages as arguements for the button widgets?
// Button for scanPage
Widget _buttonScan(String text, Color splashColor, Color highlightColor,
Color fillColor, Color textColor) {
return RaisedButton(
highlightElevation: 0.0,
splashColor: splashColor,
highlightColor: highlightColor,
elevation: 0.0,
color: fillColor,
shape: RoundedRectangleBorder(
borderRadius: new BorderRadius.circular(30.0)),
child: Text(
text,
style: TextStyle(
fontWeight: FontWeight.bold, color: textColor, fontSize: 20),
),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => ScanPage()),
);
},
);
}
// Button for searchPage
Widget _buttonSearch(String text, Color splashColor, Color highlightColor,
Color fillColor, Color textColor) {
return RaisedButton(
highlightElevation: 0.0,
splashColor: splashColor,
highlightColor: highlightColor,
elevation: 0.0,
color: fillColor,
shape: RoundedRectangleBorder(
borderRadius: new BorderRadius.circular(30.0)),
child: Text(
text,
style: TextStyle(
fontWeight: FontWeight.bold, color: textColor, fontSize: 20),
),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => SearchPage()),
);
},
);
}

Answer 1

You can pass a function as an argument to your widget that will take care of the navigation direction. In your case, either go to scanPage or searchPage, like this:
Widget _buttonScan(String text, Color splashColor, Color highlightColor,
Color fillColor, Color textColor, Widget Function() choosePage) {
return RaisedButton(
highlightElevation: 0.0,
splashColor: splashColor,
highlightColor: highlightColor,
elevation: 0.0,
color: fillColor,
shape: RoundedRectangleBorder(
borderRadius: new BorderRadius.circular(30.0)),
child: Text(
text,
style: TextStyle(
fontWeight: FontWeight.bold, color: textColor, fontSize: 20),
),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => choosePage()),
);
},
);
}
And when you call it:
_buttonScan(...,() => ScanPage ()) //To go to ScanPage
_buttonScan(...,() => SearchPage()) //To go to SearchPage

Answer 2

To pass arguments you need to use named routes of the Navigator like this :
Navigator.pushNamed(
context,
ExtractArgumentsScreen.routeName,
arguments: ScreenArguments(
'Extract Arguments Screen',
'This message is extracted in the build method.',
),
);
See the official documentation