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Description:

convex bottom bar

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The official BottomAppBar can only display a notch FAB with an app bar, and sometimes we need a convex FAB. BottomAppBar and NotchShape's implementation inspires this ConvexAppBar.
Online example can be found at https://appbar.codemagic.app.
convex_bottom_bar is now a Flutter Favorite package!

Here are some supported style:

fixed
react
badge chip

fixedCircle
reactCircle
flip

textIn
titled
tab image

button
fixed corner

How to use #
Typically ConvexAppBar can work with Scaffold by setup its bottomNavigationBar.
The ConvexAppBar has two constructors. The ConvexAppBar() will use the default style to simplify the tab creation.
Add this to your package's pubspec.yaml file, use the latest version :
dependencies:
convex_bottom_bar: ^latest_version
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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'),
],
onTap: (int i) => print('click index=$i'),
)
);
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Flutter Version Support
As Flutter is developing fast. There can be breaking changes. We will be trying to support the
stable version and beta version through different package versions.

Stable Flutter Version
Package Version
More

>=1.20
>=2.4.0
Since v1.20, the stable version changed the Stack api

<1.20
<=2.3.0
Support for stable version such as v1.17, v1.12 is not going to be updated

Features #

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

Table of contents #

Theming
Badge
Single Button
Style Hook
RTL Support
Custom Example
FAQ
Donate

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

Attributes
Description

backgroundColor
AppBar background

gradient
gradient will override backgroundColor

height
AppBar height

color
tab icon/text color

activeColor
tab icon/text color when selected

curveSize
size of the convex shape

top
top edge of the convex shape relative to AppBar

cornerRadius
draw the background with topLeft and topRight corner; Only work with fixed tab style

style
style to describe the convex shape: fixed, fixedCircle, react, reactCircle, ...

chipBuilder
custom badge builder, use ConvexAppBar.badge for default badge

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

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'),
);
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The badge() method accepts an array of badges; The badges is a map with tab items. Each value of entry can be either String, IconData, Color or Widget.
Single Button #
If you only need a single button, checkout the ConvexButton.

Scaffold(
appBar: AppBar(title: const Text('ConvexButton Example')),
body: Center(child: Text('count $count')),
bottomNavigationBar: ConvexButton.fab(
onTap: () => setState(() => count++),
),
);
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Style Hook #
Hook for internal tab style. Unlike the ConvexAppBar.builder, you may want to update the tab style without defining a new tab style.
Warning:
This hook is limited and can lead to overflow broken if the size you provide does not 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);
}
}
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RTL Support #
RTL is supported internally, and if you define the TextDirection inside the app, the AppBar should work fine.
Both RTL and LTR can be configured through Directionality:
Directionality(
textDirection: TextDirection.rtl,
child: Scaffold(body:ConvexAppBar(/*TODO ...*/)),
)
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Custom Example #
If the default style does not match your situation, try with ConvexAppBar.builder(), allowing you to custom nearly all the tab features.
Scaffold(
bottomNavigationBar: ConvexAppBar.builder(
count: 5,
backgroundColor: Colors.blue,
itemBuilder: Builder(),
)
);

// user defined class
class Builder extends DelegateBuilder {
@override
Widget build(BuildContext context, int index, bool active) {
return Text('TAB $index');
}
}
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Full custom example can be found at example.
FAQ #
Please file feature requests and bugs at the issue tracker.

How to block tab event?
Crash on flutter dev/beta channel
Change active tab index programmatically
Using an image instead of an icon for actionItem
Is there anyway to remove elevation in the bottom bar?

Donate #
You like the package ? Buy me a coffee :)