multi_navigator_bottom_bar 0.0.8

Helps you to build multi-navigator bottom navigation bar more easily.

example/lib/main.dart

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:multi_navigator_bottom_bar/multi_navigator_bottom_bar.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData.dark(),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key}) : super(key: key);

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  bool isPopLocking = false;
  static final tabSize = 4;
  var tabs = List.generate(
    tabSize,
    (index) => BottomBarTab(
          initPageBuilder: (_) => Page(index.toString()),
          tabIconBuilder: (_) => Icon(Icons.add),
          tabTitleBuilder: (_) => Text("Tab ${index.toString()}"),
        ),
  );

  @override
  Widget build(BuildContext context) => MultiNavigatorBottomBar(
        type: BottomNavigationBarType.fixed,
        initTabIndex: 0,
        pageWidgetDecorator: pageDecorator,
        tabs: tabs,
        shouldHandlePop: () => !isPopLocking,
      );

  Widget pageDecorator(pageWidget) => Column(
        children: <Widget>[
          Expanded(child: pageWidget),
          Container(
            alignment: AlignmentDirectional.center,
            height: 48.0,
            color: Colors.black,
            child: Row(
              children: <Widget>[
                Expanded(
                  child: Text(
                    "[PageWidgetDecorator] isPopLocking? $isPopLocking",
                    style: TextStyle(color: Colors.white),
                  ),
                ),
                MaterialButton(
                  child: Text(isPopLocking ? "Unlock" : "Lock"),
                  onPressed: () => setState(() => isPopLocking = !isPopLocking),
                )
              ],
            ),
          )
        ],
      );
}

class Page extends StatefulWidget {
  final String name;

  Page(this.name);

  @override
  State<StatefulWidget> createState() => PageState();
}

class PageState extends State<Page> {
  @override
  Widget build(BuildContext context) => Scaffold(
        body: Container(
          color: Colors.grey,
          alignment: AlignmentDirectional.center,
          child: FlatButton(
            color: Colors.pinkAccent,
            onPressed: () => Navigator.push(context,
                CupertinoPageRoute(builder: (context) => SubPage(widget.name))),
            child: Text("Page ${widget.name}"),
          ),
        ),
      );
}

class SubPage extends StatefulWidget {
  final String name;

  SubPage(this.name);

  @override
  State<StatefulWidget> createState() => SubPageState();
}

class SubPageState extends State<SubPage> {
  @override
  Widget build(BuildContext context) => Scaffold(
        body: Container(
          color: Colors.white,
          alignment: AlignmentDirectional.center,
          child: Text(
            "SubPage: ${widget.name}",
            style: TextStyle(color: Colors.black),
          ),
        ),
      );
}