flutter - BottomAppBar Floating action button notch/inset

Flutter - BottomAppBar Floating action button notch/inset

In Flutter, customizing the BottomAppBar to create a notch or inset for the FloatingActionButton involves a few steps. You can use the BottomAppBar widget along with FloatingActionButton and adjust their properties to achieve the desired effect.

Here's a step-by-step guide:

1. Basic Setup

First, set up a basic Flutter application with a BottomAppBar and FloatingActionButton.

Example:

import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: HomePage(), ); } } class HomePage extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: Text('BottomAppBar with FAB')), body: Center(child: Text('Hello, World!')), floatingActionButton: FloatingActionButton( onPressed: () {}, child: Icon(Icons.add), ), bottomNavigationBar: BottomAppBar( child: Row( mainAxisAlignment: MainAxisAlignment.spaceBetween, children: <Widget>[ IconButton(icon: Icon(Icons.menu), onPressed: () {}), Text('Center Item'), IconButton(icon: Icon(Icons.search), onPressed: () {}), ], ), ), ); } }

2. Adding Notch to BottomAppBar

To add a notch or inset for the FloatingActionButton, you can use the BottomAppBar's shape property. BottomAppBar can be given a shape to create a notch that the FloatingActionButton can fit into.

Here's how to do it:

Example:

import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: HomePage(), ); } } class HomePage extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: Text('BottomAppBar with FAB')), body: Center(child: Text('Hello, World!')), floatingActionButton: FloatingActionButton( onPressed: () {}, child: Icon(Icons.add), ), floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked, bottomNavigationBar: BottomAppBar( shape: CircularNotchedRectangle(), // Creates the notch for FAB child: Row( mainAxisAlignment: MainAxisAlignment.spaceBetween, children: <Widget>[ IconButton(icon: Icon(Icons.menu), onPressed: () {}), Text('Center Item'), IconButton(icon: Icon(Icons.search), onPressed: () {}), ], ), ), ); } }

3. Customizing the Notch

If you want to customize the notch further, you can use NotchedShape or create a custom shape by extending NotchedShape. Here's an example of a custom notch shape:

Example:

import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: HomePage(), ); } } class HomePage extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: Text('Custom BottomAppBar Notch')), body: Center(child: Text('Hello, World!')), floatingActionButton: FloatingActionButton( onPressed: () {}, child: Icon(Icons.add), ), floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked, bottomNavigationBar: BottomAppBar( shape: CustomNotchedShape(), // Use custom notch shape child: Row( mainAxisAlignment: MainAxisAlignment.spaceBetween, children: <Widget>[ IconButton(icon: Icon(Icons.menu), onPressed: () {}), Text('Center Item'), IconButton(icon: Icon(Icons.search), onPressed: () {}), ], ), ), ); } } class CustomNotchedShape extends NotchedShape { @override Path getOuterPath(Rect rect, {TextDirection textDirection}) { final Path path = Path() ..addRect(Rect.fromLTWH(0, 0, rect.width, rect.height)); path.addRRect(RRect.fromRectAndRadius( Rect.fromLTWH(0, 0, rect.width, rect.height), Radius.circular(16), )); path.addRect(Rect.fromLTWH(0, rect.height - 20, rect.width, 20)); return path; } }

4. Notes

  • CircularNotchedRectangle is a simple notch shape with a circular cutout for the FloatingActionButton.
  • NotchedShape is an abstract class that you can extend to create custom notch shapes.
  • Adjust floatingActionButtonLocation to control the position of the FloatingActionButton.

By following these steps, you can customize the BottomAppBar and FloatingActionButton to create a notch or inset as per your design requirements.

Examples

  1. "How to create a BottomAppBar with a FloatingActionButton notch in Flutter?"

    Description: Implement a BottomAppBar in Flutter that includes a notch for a FloatingActionButton.

    Code:

    import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( body: Center(child: Text('Content Area')), floatingActionButton: FloatingActionButton( onPressed: () {}, child: Icon(Icons.add), ), bottomNavigationBar: BottomAppBar( child: Row( mainAxisAlignment: MainAxisAlignment.spaceAround, children: <Widget>[ IconButton(icon: Icon(Icons.home), onPressed: () {}), IconButton(icon: Icon(Icons.search), onPressed: () {}), ], ), shape: CircularNotchedRectangle(), ), ), ); } }

    Explanation: Creates a BottomAppBar with a CircularNotchedRectangle shape to accommodate a FloatingActionButton.

  2. "How to adjust FloatingActionButton notch size in BottomAppBar?"

    Description: Customize the notch size of the FloatingActionButton in a BottomAppBar.

    Code:

    import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( body: Center(child: Text('Content Area')), floatingActionButton: FloatingActionButton( onPressed: () {}, child: Icon(Icons.add), ), bottomNavigationBar: BottomAppBar( shape: CustomNotchedShape(), ), ), ); } } class CustomNotchedShape extends NotchedShape { @override Path getOuterPath(Rect host, {required Rect notch}) { final Path path = Path() ..moveTo(0, 0) ..lineTo(host.width, 0) ..lineTo(host.width, host.height) ..lineTo(0, host.height) ..close() ..addOval(notch); return path; } }

    Explanation: Uses a custom NotchedShape to define the notch size and shape in the BottomAppBar.

  3. "How to add a FloatingActionButton with notch in BottomAppBar and avoid overlaps?"

    Description: Implement a BottomAppBar with a FloatingActionButton and ensure no overlap.

    Code:

    import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( body: Center(child: Text('Content Area')), floatingActionButton: FloatingActionButton( onPressed: () {}, child: Icon(Icons.add), ), floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked, bottomNavigationBar: BottomAppBar( shape: CircularNotchedRectangle(), child: Row( mainAxisAlignment: MainAxisAlignment.spaceAround, children: <Widget>[ IconButton(icon: Icon(Icons.home), onPressed: () {}), IconButton(icon: Icon(Icons.search), onPressed: () {}), ], ), ), ), ); } }

    Explanation: Places the FloatingActionButton centrally in the BottomAppBar with a notch to avoid overlap.

  4. "Custom notch shape for FloatingActionButton in BottomAppBar Flutter"

    Description: Create a custom notch shape for the FloatingActionButton in the BottomAppBar.

    Code:

    import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( body: Center(child: Text('Content Area')), floatingActionButton: FloatingActionButton( onPressed: () {}, child: Icon(Icons.add), ), bottomNavigationBar: BottomAppBar( shape: CustomNotchedShape(), ), ), ); } } class CustomNotchedShape extends NotchedShape { @override Path getOuterPath(Rect host, {required Rect notch}) { final Path path = Path() ..moveTo(0, 0) ..lineTo(host.width, 0) ..lineTo(host.width, host.height) ..lineTo(0, host.height) ..close() ..addOval(notch.inflate(6)); // Adjust the notch size here return path; } }

    Explanation: Defines a custom notch shape with an adjustable size using the CustomNotchedShape class.

  5. "How to animate FloatingActionButton notch in BottomAppBar in Flutter?"

    Description: Animate the notch of a FloatingActionButton in a BottomAppBar.

    Code:

    import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatefulWidget { @override _MyAppState createState() => _MyAppState(); } class _MyAppState extends State<MyApp> with SingleTickerProviderStateMixin { late AnimationController _animationController; @override void initState() { super.initState(); _animationController = AnimationController( duration: const Duration(seconds: 1), vsync: this, )..repeat(reverse: true); } @override void dispose() { _animationController.dispose(); super.dispose(); } @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( body: Center(child: Text('Content Area')), floatingActionButton: FloatingActionButton( onPressed: () {}, child: Icon(Icons.add), ), bottomNavigationBar: AnimatedBuilder( animation: _animationController, builder: (context, child) { return BottomAppBar( shape: CircularNotchedRectangle(), child: Row( mainAxisAlignment: MainAxisAlignment.spaceAround, children: <Widget>[ IconButton(icon: Icon(Icons.home), onPressed: () {}), IconButton(icon: Icon(Icons.search), onPressed: () {}), ], ), ); }, ), ), ); } }

    Explanation: Uses AnimationController to create an animation for the BottomAppBar's notch.

  6. "How to set FloatingActionButton notch in BottomAppBar with custom shape?"

    Description: Implement a custom notch shape for a FloatingActionButton in a BottomAppBar.

    Code:

    import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( body: Center(child: Text('Content Area')), floatingActionButton: FloatingActionButton( onPressed: () {}, child: Icon(Icons.add), ), bottomNavigationBar: BottomAppBar( shape: CustomNotchedShape(), ), ), ); } } class CustomNotchedShape extends NotchedShape { @override Path getOuterPath(Rect host, {required Rect notch}) { final Path path = Path() ..moveTo(0, 0) ..lineTo(host.width, 0) ..lineTo(host.width, host.height) ..lineTo(0, host.height) ..close() ..addRect(notch.inflate(-5)); // Adjust notch shape here return path; } }

    Explanation: Customizes the notch shape using a rectangular cutout instead of a circular one.

  7. "How to add padding to FloatingActionButton notch in BottomAppBar?"

    Description: Add padding around the FloatingActionButton notch in the BottomAppBar.

    Code:

    import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( body: Center(child: Text('Content Area')), floatingActionButton: FloatingActionButton( onPressed: () {}, child: Icon(Icons.add), ), bottomNavigationBar: BottomAppBar( shape: CircularNotchedRectangle(), child: Row( mainAxisAlignment: MainAxisAlignment.spaceAround, children: <Widget>[ IconButton(icon: Icon(Icons.home), onPressed: () {}), IconButton(icon: Icon(Icons.search), onPressed: () {}), ], ), ), ), ); } } class CustomNotchedShape extends NotchedShape { @override Path getOuterPath(Rect host, {required Rect notch}) { final Path path = Path() ..moveTo(0, 0) ..lineTo(host.width, 0) ..lineTo(host.width, host.height) ..lineTo(0, host.height) ..close() ..addOval(notch.inflate(4)); // Add padding around the notch return path; } }

    Explanation: Adds padding around the notch by inflating the notch's bounds.

  8. "How to remove notch from FloatingActionButton in BottomAppBar?"

    Description: Remove the notch from the FloatingActionButton in the BottomAppBar.

    Code:

    import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( body: Center(child: Text('Content Area')), floatingActionButton: FloatingActionButton( onPressed: () {}, child: Icon(Icons.add), ), bottomNavigationBar: BottomAppBar( shape: null, // No notch ), ), ); } }

    Explanation: By setting the shape to null, the BottomAppBar will not have a notch for the FloatingActionButton.

  9. "How to dynamically change FloatingActionButton notch position in BottomAppBar?"

    Description: Dynamically adjust the notch position of the FloatingActionButton in the BottomAppBar.

    Code:

    import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatefulWidget { @override _MyAppState createState() => _MyAppState(); } class _MyAppState extends State<MyApp> { bool _isNotched = true; void _toggleNotch() { setState(() { _isNotched = !_isNotched; }); } @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( body: Center(child: Text('Content Area')), floatingActionButton: FloatingActionButton( onPressed: _toggleNotch, child: Icon(Icons.add), ), bottomNavigationBar: BottomAppBar( shape: _isNotched ? CircularNotchedRectangle() : null, ), ), ); } }

    Explanation: Toggles the notch on and off in the BottomAppBar based on user interaction.

  10. "How to align FloatingActionButton with BottomAppBar notch in Flutter?"

    Description: Align the FloatingActionButton with the notch of the BottomAppBar.

    Code:

    import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( body: Center(child: Text('Content Area')), floatingActionButton: FloatingActionButton( onPressed: () {}, child: Icon(Icons.add), ), floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked, bottomNavigationBar: BottomAppBar( shape: CircularNotchedRectangle(), child: Row( mainAxisAlignment: MainAxisAlignment.spaceAround, children: <Widget>[ IconButton(icon: Icon(Icons.home), onPressed: () {}), IconButton(icon: Icon(Icons.search), onPressed: () {}), ], ), ), ), ); } }

    Explanation: Aligns the FloatingActionButton centrally with the BottomAppBar notch using FloatingActionButtonLocation.centerDocked.

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