OpenFlutter/flutter_oktoast shows on main page only?

Question

I am using this library to show custom toast in my app. I have multiple pages in my app. The problem is, toast appears on the main page even when I call showToastWidget(...) from any other pages.

Main Page

  @override
  Widget build(BuildContext context) {
    return OKToast(
      child: Scaffold(
        backgroundColor: Theme.of(context).accentColor,
        body: Center(
          child: SizedBox(
            height: 50,
            width: 50,
            child: Image(image: AssetImage('assets/ic_logo.png')),
          ),
        ),
      ),
    );
  }

Page 2

@override
  Widget build(BuildContext context) {
    return OKToast(
      child: Scaffold(
        appBar: AppBar(
          centerTitle: true,
          title: Text('Reset Password'),
        ),
        body: Center(
          child: Padding(
            padding: EdgeInsets.all(20),
            child: FlatButton(
              onPressed: () {
                showToastWidget(
                  Text('Hello. I am Toast!!!'),
                  duration: Duration(seconds: 2),
                );
              },
              child: Text('Show'),
            ),
          ),
        ),
      ),
    );
  }

When I call showToastWidget(...) from this page, it appears on Main Page

EDIT 1 I get this exception when I pass context to showToastWidget()

I/flutter (24327): The following NoSuchMethodError was thrown while handling a gesture:
I/flutter (24327): The getter 'position' was called on null.
I/flutter (24327): Receiver: null
I/flutter (24327): Tried calling: position
I/flutter (24327): 
I/flutter (24327): When the exception was thrown, this was the stack:
I/flutter (24327): #0      Object.noSuchMethod (dart:core/runtime/libobject_patch.dart:50:5)
I/flutter (24327): #1      showToastWidget (package:oktoast/src/toast.dart:210:40)

Answer 1

I am the author of OKToast, I am very glad that you use this library.

This tip of Toast is based on the design of toast in android on the mobile side. The inspiration for OKToast itself comes from toast, so it is inevitable that it has received an impact, not adapting to the individual page-level Toast.

If you need a page-level OKToast component, you might need to do this:

import 'package:flutter/material.dart';
import 'package:oktoast/oktoast.dart';
import 'package:simple_widget/simple_widget.dart';

class CategoryPage extends StatefulWidget {
  @override
  _CategoryPageState createState() => _CategoryPageState();
}

class _CategoryPageState extends State<CategoryPage> {
  @override
  Widget build(BuildContext context) {
    return OKToast(
      child: SimpleScaffold(
        title: "CategoryPage",
        actions: <Widget>[
          Builder(
            builder: (ctx) => IconButton(
                  icon: Icon(Icons.trip_origin),
                  onPressed: () {
                    showToast("page toast", context: ctx); // use context to show toast in the page-level OKToast.
                  },
                ),
          ),
        ],
        child: Container(),
      ),
    );
  }

}

Answer 2

Looks like the OKToast library does not support multiple OKToast widgets in the same app. You will have to wrap your entire app in an OKToast widget, full sample:

import 'package:flutter/material.dart';
import 'package:oktoast/oktoast.dart';

void main() => runApp(App());

class App extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return OKToast(
      child: MaterialApp(
        home: MainPage(),
      ),
    );
  }
}

class MainPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Theme.of(context).accentColor,
      body: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            FlatButton(
              child: Text("Show"),
              onPressed: () {
                showToast(
                  "Main Page toast",
                  duration: Duration(seconds: 2),
                );
              },
            ),
            SizedBox(height: 12.0),
            FlatButton(
              child: Text("Go to next page"),
              onPressed: () => _goToNextPage(context),
            ),
          ],
        ),
      ),
    );
  }

  void _goToNextPage(BuildContext context) {
    Navigator.push(
      context,
      MaterialPageRoute(
        builder: (context) => SecondPage(),
      ),
    );
  }
}

class SecondPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        centerTitle: true,
        title: Text("Second Page"),
      ),
      body: Center(
        child: Padding(
          padding: EdgeInsets.all(20),
          child: FlatButton(
            onPressed: () {
              showToast(
                "Second Page toast",
                duration: Duration(seconds: 2),
              );
            },
            child: Text('Show'),
          ),
        ),
      ),
    );
  }
}