Flutter make simple Facebook menu

Question

In Flutter i'm trying to make a simple Facebook menu, in below screen shot we have number one widget and when i click on that, widget which that is below the current widget, should be resized and grow up and showing another icons into that

this below code which i introduced reference work fine, but it doesn't have background container

in referenced the link Column used and i changed it to Stack and doesn't work correctly

reference

import 'package:flutter/material.dart';

class FancyFab extends StatefulWidget {
  final Function() onPressed;
  final String tooltip;
  final IconData icon;

  FancyFab({this.onPressed, this.tooltip, this.icon});

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

class _FancyFabState extends State<FancyFab>
    with SingleTickerProviderStateMixin {
  bool isOpened = false;
  AnimationController _animationController;
  Animation<Color> _buttonColor;
  Animation<double> _animateIcon;
  Animation<double> _translateButton;
  Curve _curve = Curves.easeOut;
  double _fabHeight = 56.0;

  @override
  initState() {
    _animationController =
        AnimationController(vsync: this, duration: Duration(milliseconds: 500))
          ..addListener(() {
            setState(() {});
          });
    _animateIcon =
        Tween<double>(begin: 0.0, end: 1.0).animate(_animationController);
    _buttonColor = ColorTween(
      begin: Colors.blue,
      end: Colors.red,
    ).animate(CurvedAnimation(
      parent: _animationController,
      curve: Interval(
        0.00,
        1.00,
        curve: Curves.linear,
      ),
    ));
    _translateButton = Tween<double>(
      begin: _fabHeight,
      end: -14.0,
    ).animate(CurvedAnimation(
      parent: _animationController,
      curve: Interval(
        0.0,
        0.75,
        curve: _curve,
      ),
    ));
    super.initState();
  }

  @override
  dispose() {
    _animationController.dispose();
    super.dispose();
  }

  animate() {
    if (!isOpened) {
      _animationController.forward();
    } else {
      _animationController.reverse();
    }
    isOpened = !isOpened;
  }

  Widget add() {
    return Container(
      child: FloatingActionButton(
        onPressed: null,
        tooltip: 'Add',
        child: Icon(Icons.add),
      ),
    );
  }

  Widget image() {
    return Container(
      child: FloatingActionButton(
        onPressed: null,
        tooltip: 'Image',
        child: Icon(Icons.image),
      ),
    );
  }

  Widget inbox() {
    return Container(
      child: FloatingActionButton(
        onPressed: null,
        tooltip: 'Inbox',
        child: Icon(Icons.inbox),
      ),
    );
  }

  Widget toggle() {
    return Container(
      child: FloatingActionButton(
        backgroundColor: _buttonColor.value,
        onPressed: animate,
        tooltip: 'Toggle',
        child: AnimatedIcon(
          icon: AnimatedIcons.menu_close,
          progress: _animateIcon,
        ),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: <Widget>[
        Transform(
          transform: Matrix4.translationValues(
            0.0,
            _translateButton.value * 3.0,
            0.0,
          ),
          child: add(),
        ),
        Transform(
          transform: Matrix4.translationValues(
            0.0,
            _translateButton.value * 2.0,
            0.0,
          ),
          child: image(),
        ),
        Transform(
          transform: Matrix4.translationValues(
            0.0,
            _translateButton.value,
            0.0,
          ),
          child: inbox(),
        ),
        toggle(),
      ],
    );
  }
}

I want to use this widget into Flutter listview, that should be appear where i clicked, for example you suppose i have i IconButton into ListView items, when i click on that, this widget should be appear on clicked position and Button should be FloatingActionButton

Answer 1

hi please look at this library ... https://pub.dev/packages/flutter_portal this is the simplest way to create an overlay in Flutter ...

PortalEntry(
  visible: isMenuVisible, //true Or False
  portalAnchor: Alignment.topLeft,
  childAnchor: Alignment.topRight,
  portal: TheMenuWidget, // option 1 + option 2 (White)
  child: MyButton, // show Menu Button (Grey) 
)

Answer 2

I implemented this using Stack and AnimatedContainer.

• using Positioned in Stack , I placed it at bottom. The reason for this is to align both the Container and FAB in same position when its animate.
• using AnimatedContainer, I made a simple animation that changes its height when we tap on FAB using bool value.

(I Add one extra container in column, it will hide behind FAB and also Align it perfectly, but you can add SizedBox or Container without color and keep its size as 54.0 at last, if you're not using list.generate)

Try this on DartPad

import 'package:flutter/material.dart';

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: darkBlue),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
            child: Container(
          width: 250,
          height: 250,
          color: Colors.white,
          child: YellowBird(),
        )),
      ),
    );
  }
}

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

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

class _YellowBirdState extends State<YellowBird> {
  bool animate = true;

  @override
  Widget build(BuildContext context) {
    return Stack(
      alignment: AlignmentDirectional.topCenter,
      children: [
      Positioned(
        bottom: 0,
        child: AnimatedContainer(
            width: 54.0,
            decoration: BoxDecoration(
             color: Colors.redAccent,
             borderRadius: BorderRadius.all(Radius.circular(360))
            ),
            height: animate ? 56.0 : 250.0,
            duration: Duration(milliseconds: 300),
            child: animate
                ? Container()
                : Column(
                    children: List.generate(
                        4,
                        (i) => Expanded(
                                child: Container(
                              width: 50,
                              height: 50,
                              decoration: BoxDecoration(
                                color: Colors.white,
                                shape: BoxShape.circle,
                              ),
                           ),
                        ),
                     ),
                  ),
               ),
            ),
      Positioned(
          bottom: 0,
          child: FloatingActionButton(
              backgroundColor: Colors.grey,
          child: Icon(animate ? Icons.menu : Icons.close, size: 30),
              onPressed: () {
                setState(() {
                  animate = !animate;
                });
              })),
    ]);
  }
}

let me know if this work or Is they anything to change from this.