convex_bottom_bar 1.0.1

A Flutter package which implements a ConvexAppBar to show a convex tab in the bottom bar. Theming supported.

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convex_bottom_bar

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.

Install Demo app-release.apk

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:

dependencies:
  convex_bottom_bar: ^0.0.1

import 'package:convex_bottom_bar/convex_bottom_bar.dart';

Scaffold(
  bottomNavigationBar: ConvexAppBar(
    items: TAB_ITEMS,
    onTap: (int i) => setState(() {
      _selectedIndex = i;
    }),
    actionItem: const TabItem(icon: Icons.add, title: "Publish"),
    onTapActionButton: () => setState(() {
      _selectedIndex = -1;
    }),
  ),
);

Table of contents

• Theming

• Custom Example

• Contribution

• Help

Theming

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

Attributes	Description
backgroundColor	AppBar background
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

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.

Here is a custom sample:

Scaffold(
  bottomNavigationBar: ConvexAppBar.builder(
    count: items.length,
    backgroundColor: _tabBackgroundColor,
    tabBuilder: (BuildContext context, int index, bool active) {
      var navigationItem = items[index];
      var _color = active ? Colors.white : Colors.white60;
      var _icon = active
          ? navigationItem.activeIcon ?? navigationItem.icon
          : navigationItem.icon;
      return Container(
        color: Colors.transparent,
        padding: EdgeInsets.only(bottom: 2),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.end,
          children: <Widget>[
            Icon(_icon, color: _color),
            Text(navigationItem.title, style: TextStyle(color: _color))
          ],
        ),
      );
    },
    actionBuilder: (BuildContext context, int index, bool active) {
      var _color = active ? Colors.white : Colors.white60;
      return Stack(
        alignment: Alignment.center,
        children: <Widget>[
          SizedBox(
            width: 60,
            height: 60,
            child: Container(
              decoration:
                  BoxDecoration(shape: BoxShape.circle, color: _color),
              child: Icon(
                Icons.add,
                size: 40,
                color: _tabBackgroundColor,
              ),
            ),
          )
        ],
      );
    },
  ),
);

Contribution

Please file feature requests and bugs at the issue tracker.

Help

For more detail, please refer to the example project.