A custom decoration for quickly adding multiple borders of varying colors and widths to your widgets.

Features

• Set each border's color.
• Set each border's width.
• Set a border radius for rectangular borders.
• Rectangular or circular borders.
• MultiBorderDecoration.evenBorders() constructor simplifies creating borders of even widths.

Getting started

Import:

import 'package:multi_border/multi_border.dart';

Add a MultiBorderDecoration to your Container widget:

Container(
  decoration: MultiBorderDecoration(
    borderSides: [
      BorderSide(color: Colors.blue.shade100, width: 8),
      BorderSide(color: Colors.blue.shade200, width: 12),
      BorderSide(color: Colors.blue.shade300, width: 16)
    ],
  ),
  child: const Text('Wrap me with colorful borders'),
);

Or, use the MultiBorderDecoration.evenBorders() constructor to create borders of equal width.

• This will create a border for each color in [borderColors] of width [width].

Container(
  decoration: MultiBorderDecoration.evenBorders(
    width: 8,
    borderColors: [
      Colors.blue.shade100,
      Colors.blue.shade200,
      Colors.blue.shade300,
    ],
  ),
  child: const Text('Wrap me with colorful borders'),
);

Examples

Sharp rectangle with even borders:

Container(
  decoration: MultiBorderDecoration.evenBorders(
    width: 8,
    borderColors: const [
      Color(0xFFF14A42),
      Color(0xFFF27D3B),
      Color(0xFFF2A83A),
      Color(0xFFF8C43F),
    ],
  ),
  child: Container(
    width: 100,
    height: 100,
    color: const Color(0xFF4B3D2F),
    child: const Icon(Icons.thumb_up, color: Color(0xFFCEC1B6)),
  ),
);

Rounded rectangle with even borders:

Container(
  clipBehavior: Clip.hardEdge,
  decoration: MultiBorderDecoration.evenBorders(
    width: 8,
    innerRadius: BorderRadius.circular(8),
    borderColors: const [
      Color(0xFFF14A42),
      Color(0xFFF27D3B),
      Color(0xFFF2A83A),
      Color(0xFFF8C43F),
    ],
  ),
  child: Container(
    width: 100,
    height: 100,
    color: const Color(0xFF4B3D2F),
    child: const Icon(Icons.thumb_up, color: Color(0xFFCEC1B6)),
  ),
);

Rounded rectangle with varying width borders:

Container(
  clipBehavior: Clip.hardEdge,
  decoration: MultiBorderDecoration(
    innerRadius: const BorderRadius.only(
      topLeft: Radius.circular(16),
      bottomRight: Radius.circular(16),
    ),
    borderSides: const [
      BorderSide(color: Color(0xFFF14A42), width: 4),
      BorderSide(color: Color(0xFFF27D3B), width: 8),
      BorderSide(color: Color(0xFFF2A83A), width: 12),
      BorderSide(color: Color(0xFFF8C43F), width: 16),
    ],
  ),
  child: Container(
    width: 100,
    height: 100,
    color: const Color(0xFF4B3D2F),
    child: const Icon(Icons.thumb_up, color: Color(0xFFCEC1B6)),
  ),
);

Circle with even borders:

Container(
  clipBehavior: Clip.antiAlias,
  decoration: MultiBorderDecoration.evenBorders(
    shape: BoxShape.circle,
    width: 8,
    borderColors: const [
      Color(0xFFF14A42),
      Color(0xFFF27D3B),
      Color(0xFFF2A83A),
      Color(0xFFF8C43F),
    ],
  ),
  child: Container(
    width: 100,
    height: 100,
    color: const Color(0xFF4B3D2F),
    child: const Icon(Icons.thumb_up, color: Color(0xFFCEC1B6)),
  ),
);

Circle with varying width borders:

Container(
  clipBehavior: Clip.antiAlias,
  decoration: MultiBorderDecoration(
    shape: BoxShape.circle,
    borderSides: const [
      BorderSide(color: Color(0xFFF14A42), width: 4),
      BorderSide(color: Color(0xFFF27D3B), width: 8),
      BorderSide(color: Color(0xFFF2A83A), width: 12),
      BorderSide(color: Color(0xFFF8C43F), width: 16),
    ],
  ),
  child: Container(
    width: 100,
    height: 100,
    color: const Color(0xFF4B3D2F),
    child: const Icon(Icons.thumb_up, color: Color(0xFFCEC1B6)),
  ),
);