A Segmented Control Widget in Material Design for Flutter

Material Segmented Control

A material segmented control like the one for iOS, in Material style.

image

Why?

We all know well the Cupertino segmented widget in Flutter. But there is no similar in Material, so I thought, why not to create one.

You can check it out on pub.dev: (see package on pub.dev)

How to use

Import the package

In your pubspec.yaml, add

dependencies: 
    material_segmented_control: ^5.0.0

Import code

Wherever you want to use this widget, import

import 'package:material_segmented_control/material_segmented_control.dart';

Basic usage

int _currentSelection = 0;

MaterialSegmentedControl(
    children: _children,
    selectionIndex: _currentSelection,
    borderColor: Colors.grey,
    selectedColor: Colors.redAccent,
    unselectedColor: Colors.white,
    selectedTextStyle: TextStyle(color: Colors.white),
    unselectedTextStyle: TextStyle(color: Colors.redAccent),
    borderWidth: 0.7,
    borderRadius: 32.0,
    disabledChildren: [3],
    onSegmentTapped: (index) {
      setState(() {
        _currentSelection = index;
      });
    },
);

Map<int, Widget> _children = {
  0: Text('Hummingbird'),
  1: Text('Kiwi'),
  2: Text('Rio'),
  3: Text('Telluraves')
};

Features

  • Disable the selection for all children by setting selectionIndex to null. It un-selects all options.
  • Disable children to being not "clickable" (like setting onPressed to null on a button) by setting disabledChildren. Give it a list with all indices that should be disabled. Give it either null or an empty list to not use the disabled feature.

You might want to check out the example project.

Use this package as a library

Depend on it

Run this command:

With Flutter:

 $ flutter pub add material_segmented_control

This will add a line like this to your package's pubspec.yaml (and run an implicit flutter pub get):

dependencies:
  material_segmented_control: ^5.0.0

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

Import it

Now in your Dart code, you can use:

import 'package:material_segmented_control/material_segmented_control.dart';

example/lib/main.dart

import 'dart:math';

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

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  int? _currentSelection = 0;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        useMaterial3: true,
      ),
      home: Scaffold(
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [
              MaterialSegmentedControl(
                children: _children,
                selectionIndex: _currentSelection,
                borderColor: Colors.grey,
                selectedColor: Colors.redAccent,
                unselectedColor: Colors.white,
                selectedTextStyle: TextStyle(color: Colors.white),
                unselectedTextStyle: TextStyle(color: Colors.redAccent),
                borderWidth: 0.7,
                borderRadius: 6.0,
                disabledChildren: _disabledIndices,
                verticalOffset: 8.0,
                onSegmentTapped: (index) {
                  setState(() {
                    _currentSelection = index;
                  });
                },
              ),
              SizedBox(
                height: 8,
              ),
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  ElevatedButton(
                    child: Text('Toggle disabled'),
                    onPressed: () {
                      // This is just an example on how disabled children work.
                      // A disabled index is determined randomly.
                      setState(() {
                        _disabledIndices.clear();
                        _disabledIndices.add(_randomInt());
                      });
                    },
                  ),
                  const SizedBox(width: 8),
                  ElevatedButton(
                    child: Text('Un-select all'),
                    onPressed: () => setState(() => _currentSelection = null),
                  ),
                ],
              ),
            ],
          ),
        ),
      ),
    );
  }

  Map<int, Widget> _children = {
    0: Text('Flutter'),
    1: Text('Dart'),
    2: Text('Desktop'),
    3: Text('Mobile'),
    4: Text('Web')
  };

  // Holds all indices of children to be disabled.
  // Set this list either null or empty to have no children disabled.
  List<int> _disabledIndices = [];

  int _randomInt() {
    return Random.secure().nextInt(_children.length);
  }
}

Download details:

Author: benjamin-kraatz

Source: https://github.com/benjamin-kraatz/material_segmented_control

#flutter #android #web-development #web #ios #ui #material 

A Segmented Control Widget in Material Design for Flutter
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