Flutter: possible to detect when a drawer is open?

Question

Is it possible to detect when a Drawer is open so that we can run some routine to update its content?

A typical use case I have would be to display the number of fol

Answer 1

I think one simple solution is to override the leading property of your AppBar so you can have access when the menu icon is pressed an run your API calls based on that.

Yet I may have misunderstood your question because with the use case you provided, you usually need to manage it in a way that you can listen to any change which will update the value automatically so I am not sure what are you trying to trigger when the drawer is open.

Anyway here is the example.

class DrawerExample extends StatefulWidget {
  @override
  _DrawerExampleState createState() => new _DrawerExampleState();
}

class _DrawerExampleState extends State {
  GlobalKey _key = new GlobalKey();
  int _counter =0;
  _handleDrawer(){
      _key.currentState.openDrawer();

           setState(() {
          ///DO MY API CALLS
          _counter++;
        });

  }
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      key: _key,
      appBar: new AppBar(
        title: new Text("Drawer Example"),
        centerTitle: true,
        leading: new IconButton(icon: new Icon(
          Icons.menu
        ),onPressed:_handleDrawer,),
      ),
      drawer: new Drawer(
        child: new Center(
          child: new Text(_counter.toString(),style: Theme.of(context).textTheme.display1,),
        ),
      ),
    );
  }
}