preview

Languages: English|简体中文

convex_bottom_bar

Pub github Codemagic build status Coverage Status

convex_bottom_bar is now a Flutter Favorite package!

The official BottomAppBar can only display a notch FAB with app bar, sometimes we need a convex FAB. This ConvexAppBar is inspired by BottomAppBar and NotchShape's implementation.

Online example can be found at https://appbar.codemagic.app.

Here are some supported style:

fixedreactbadge chip
fixedCirclereactCircleflip
textIntitledtab image

How to use

Typically ConvexAppBar can work with Scaffold by setup its bottomNavigationBar.

The ConvexAppBar has to two constructors, the ConvexAppBar() will use default style to simplify the tab creation.

Add this to your package's pubspec.yaml file, use the latest version Pub:

dependencies:
  convex_bottom_bar: ^latest_version

You like the package ? buy me a kofi :)

Buy Me a Coffee at ko-fi.com

import 'package:convex_bottom_bar/convex_bottom_bar.dart';

Scaffold(
  bottomNavigationBar: ConvexAppBar(
    items: [
      TabItem(icon: Icons.home, title: 'Home'),
      TabItem(icon: Icons.map, title: 'Discovery'),
      TabItem(icon: Icons.add, title: 'Add'),
      TabItem(icon: Icons.message, title: 'Message'),
      TabItem(icon: Icons.people, title: 'Profile'),
    ],
    initialActiveIndex: 2,//optional, default as 0
    onTap: (int i) => print('click index=$i'),
  )
);

Features

  • Provide multiple internal styles
  • Ability to change the theme of AppBar
  • Provide builder API to customize new style
  • Add badge on tab menu
  • Elegant transition animation
  • Provide hook API to override some of internal styles
  • RTL support

Table of contents

Badge

If you need to add badge on the tab, use ConvexAppBar.badge to get it done.

badge demo

ConvexAppBar.badge({0: '99+', 1: Icons.assistant_photo, 2: Colors.redAccent},
  items: [
    TabItem(icon: Icons.home, title: 'Home'),
    TabItem(icon: Icons.map, title: 'Discovery'),
    TabItem(icon: Icons.add, title: 'Add'),
  ],
  onTap: (int i) => print('click index=$i'),
);

The badge() method accept an array of badges; The badges is map with tab items, each value of entry can be either String, IconData, Color or Widget.

Theming

The bar will use default style, you may want to theme it. Here are some supported attributes:

AttributesDescription
backgroundColorAppBar background
gradientgradient will override backgroundColor
heightAppBar height
colortab icon/text color
activeColortab icon/text color when selected
curveSizesize of the convex shape
toptop edge of the convex shape relative to AppBar
stylestyle to describe the convex shape: fixed, fixedCircle, react, reactCircle, ...
chipBuildercustom badge builder, use ConvexAppBar.badge for default badge

Custom Example

If the default style does not match with your situation, try with ConvexAppBar.builder(), which allow you to custom nearly all the tab features.

Scaffold(
  bottomNavigationBar: ConvexAppBar.builder(
    count: 5,
    backgroundColor: Colors.blue,
    style: TabStyle.fixed,
    itemBuilder: Builder(),
  )
);

/*user defined class*/
class Builder extends DelegateBuilder {
  @override
  Widget build(BuildContext context, int index, bool active) {
    return Text('TAB $index');
  }
}

Full custom example can be found at example.

Style Hook

Hook for internal tab style. Unlike the ConvexAppBar.builder, you may want to update the tab style without define a new tab style.

Warning:
This hook is limited, and can lead to overflow broken if the size you provide does no match with internal style.

StyleProvider(
  style: Style(),
  child: ConvexAppBar(
    initialActiveIndex: 1,
    height: 50,
    top: -30,
    curveSize: 100,
    style: TabStyle.fixedCircle,
    items: [
      TabItem(icon: Icons.link),
      TabItem(icon: Icons.import_contacts),
      TabItem(title: "2020", icon: Icons.work),
    ],
    backgroundColor: _tabBackgroundColor,
  ),
)
class Style extends StyleHook {
  @override
  double get activeIconSize => 40;

  @override
  double get activeIconMargin => 10;

  @override
  double get iconSize => 20;

  @override
  TextStyle textStyle(Color color) {
    return TextStyle(fontSize: 20, color: color);
  }
}

RTL Support

RTL is supported internally, if you define the TextDirection inside app, the AppBar should work fine. Both RTL and LTR can be configured through Directionality:

Directionality(
  textDirection: TextDirection.rtl,
  child: Scaffold(body:ConvexAppBar(/*TODO ...*/)),
)

FAQ

Contribution

Please file feature requests and bugs at the issue tracker.

Libraries

convex_appbar