Comment soustraire la hauteur de l'appar
Firstly declare the AppBar widget that you will use in your Scaffold.
Widget demoPage() {
AppBar appBar = AppBar(
title: Text('Demo'),
);
return Scaffold(
appBar: appBar,
body: /*
page body
*/,
);
}
Now you can get the height of your appBar using its preferredSized:
double height = appBar.preferredSize.height
Evil Eel