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

Best solution

ScaffoldState has a useful method isDrawerOpen which provides the status of open/close.

Example: Here on the back press, it first checks if the drawer is open, if yes then first it will close before exit.

/// create a key for the scaffold in order to access it later.
GlobalKey _scaffoldKey = GlobalKey();

@override
Widget build(context) {
   return WillPopScope(
  child: Scaffold(
    // assign key (important)
    key: _scaffoldKey,
    drawer: SideNavigation(),
  onWillPop: () async {
    // drawer is open then first close it
    if (_scaffoldKey.currentState.isDrawerOpen) {
      Navigator.of(context).pop();
      return false;
    }
    // we can now close the app.
    return true;
  });}