How to check whether Alert Dialog is open in flutter

Question

I am working on my flutter application and I want to check whether the alert dialog is open or not on the screen . Can anyone tell me how to do that, basically I want to do some stuff just before and after alert dialog opens and closes.

Answer 1

First thing is you will be showing dialog yourself. So, you can use a bool value to track it.

Like this.

bool _isDialogShowing = false;

void _showDialog() {
  _isDialogShowing = true; // set it `true` since dialog is being displayed
  showDialog(
    context: context,
    builder: (context) {
      return AlertDialog(
        title: Text("Title"),
        actions: <Widget>[
          FlatButton(
            child: Text("CANCEL"),
            onPressed: () {
              _isDialogShowing = false; // set it `false` since dialog is closed
              Navigator.of(context).pop();
            },
          )
        ],
      );
    },
  );
}

To listen for back button, you can wrap your root widget in WillPopScope and handle things in onWillPop() accordingly.

Answer 2

try this !!!

Future _dialog;

_checkAndShowDialog() async {

    if (_dialog == null) {
      _dialog = showMyDialog();
      await _dialog;
      _dialog = null;
    } else {
     //do nothing
    }

}

//dialog should return future
Future showMyDialog() {
    return showDialog(
        context: _context,
        child: Container(child: Text("I am dialog"),) );
  }