fl_border_gradient 1.1.0

Flutter gradient borders: linear, sweep, radial, diagonal, spin, glow, dash, per-side frames, and theme defaults.

fl_border_gradient

A powerful and flexible Flutter package for creating stunning gradient borders for Containers and other widgets. Supports linear, diagonal, sweeping, and radial gradients with advanced features like animations, glowing effects, and dashed borders.

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🎨 Features

• Customizable Gradients: Linear, Sweep, Radial, Diagonal, and Opposite corners.
• Animated Borders: Create spinning gradient effects with just one widget.
• Glowing Effects: Add a perfectly synced blurred glow underneath your gradient borders.
• Dashed Borders: Support for dashed and dotted borders with gradient flow.
• Universal Compatibility: Works with BoxDecoration, BorderRadius, and all shapes (Rectangle, Circle).
• Per-side borders: Draw a gradient on any combination of edges (L-shape, top bar, etc.) with GradientSidesBoxBorder.
• Theming: Optional FlBorderGradientTheme via ThemeData.extensions for shared defaults.

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🚀 Getting Started

Add the package to your pubspec.yaml:

dependencies:
  fl_border_gradient: ^1.1.0

Import the package:

import 'package:fl_border_gradient/fl_border_gradient.dart';

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📖 Usage Examples

1. Standard Linear Border

The most straightforward way to add a gradient border to any BoxDecoration.

Container(
  decoration: BoxDecoration(
    borderRadius: BorderRadius.circular(20),
    border: GradientBoxBorder(
      colors: const [Color(0xFFFFFFFF), Color(0xFF639AFF)],
      stops: const [0.0, 1.0],
      tileMode: TileMode.mirror,
      width: 2.0,
    ),
  ),
  child: Center(child: Text("Linear Border")),
)

2. Diagonal Border

A specialized constructor that aligns colors to opposing corners (Top-Left to Bottom-Right and Top-Right to Bottom-Left).

Container(
  decoration: BoxDecoration(
    border: GradientBoxBorder.diagonal(
      colors: const [Colors.redAccent, Colors.purpleAccent],
      stops: const [0.5, 0.9], // Controls where mixing starts/stops!
      width: 1,
    ),
  ),
)

3. Opposite Corners Border

Creates a sweeping effect where opposite edges mirror each other.

Container(
  decoration: BoxDecoration(
    border: GradientBoxBorder.opposite(
      colors: const [Colors.amber, Colors.teal],
      width: 3.0,
    ),
  ),
)

4. Radial & Sweep Borders

Full support for standard Flutter radial and sweep shapes.

Radial Border	Standard Sweep

// Radial
GradientBoxBorder.radial(
  colors: const [Colors.orange, Colors.deepOrange],
  radius: 0.8,
)

// Sweep
GradientBoxBorder.sweep(
  colors: const [Colors.blue, Colors.green, Colors.yellow, Colors.red, Colors.blue],
  width: 3.0,
)

5. Dashed Borders

Add a dashPattern to any GradientBoxBorder.

GradientBoxBorder(
  colors: const [Colors.white, Colors.blue],
  width: 3.0,
  dashPattern: const [10.0, 5.0], // 10px dash, 5px gap
)

6. Per-side gradient border (GradientSidesBoxBorder)

Use GradientSidesBoxBorder when you only want specific edges (for example a top accent or an L-shaped frame). Partial sides are drawn on axis-aligned rectangles with no border radius. When all four sides are enabled, behavior matches GradientBoxBorder (including circles, rounded rects, and dashes).

Container(
  height: 56,
  width: double.infinity,
  decoration: BoxDecoration(
    border: GradientSidesBoxBorder.linear(
      colors: const [Colors.deepPurple, Colors.cyan],
      width: 3,
      includeTop: true,
      includeLeft: true,
      includeRight: false,
      includeBottom: false,
    ),
  ),
  child: const Center(child: Text('Top + left gradient edges')),
)

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🎨 Theme defaults (FlBorderGradientTheme)

Register FlBorderGradientTheme on MaterialApp / ThemeData to share default colors and widths:

MaterialApp(
  theme: ThemeData(
    extensions: const [
      FlBorderGradientTheme(
        defaultGradientColors: [Color(0xFF6366F1), Color(0xFFA855F7)],
        defaultBorderWidth: 2.5,
        defaultGlowSize: 10,
        defaultGlowOpacity: 0.45,
      ),
    ],
  ),
  home: YourHome(),
);

Read values anywhere:

final t = FlBorderGradientTheme.of(context);
Container(
  decoration: BoxDecoration(
    border: GradientBoxBorder(
      colors: t.defaultGradientColors,
      width: t.defaultBorderWidth,
    ),
  ),
  child: const Text('Themed border'),
);

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🖼️ BoxDecoration with image and gradient border

BoxDecoration paints in order: color → gradient → image → then border. A gradient border stacks cleanly on top of a background image.

BoxDecoration(
  image: DecorationImage(image: AssetImage('assets/bg.png'), fit: BoxFit.cover),
  border: GradientBoxBorder(
    colors: const [Colors.white, Colors.blueAccent],
    width: 2,
  ),
)

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♿ Accessibility

Gradient borders, spinning animations, and glow are visual decoration. Do not rely on color or motion alone to convey critical meaning.

• AnimatedGradientBorder defaults excludeBorderFromSemantics to true so assistive technologies focus on the child (set to false if you intentionally expose the ring).
• GlowingGradientBorder defaults excludeGlowFromSemantics to true for the blur layer under the real border.

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✨ Advanced Features

Animated Spinning Border

Use the AnimatedGradientBorder widget to add an infinite spinning effect.

AnimatedGradientBorder(
  gradientColors: const [Colors.green, Colors.blue, Colors.purple, Colors.red, Colors.green],
  borderWidth: 4.0,
  borderRadius: BorderRadius.circular(30),
  animationTime: const Duration(seconds: 4),
  child: Container( /* ... */ ),
)

Glowing Gradient Border

Add a neon-style glow effect that matches your gradient perfectly.

GlowingGradientBorder(
  glowSize: 15.0,
  glowOpacity: 0.8,
  borderRadius: BorderRadius.circular(12),
  border: GradientBoxBorder.diagonal(
    colors: const [Colors.redAccent, Colors.purpleAccent],
    width: 3.0,
  ),
  child: Container( /* ... */ ),
)

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🏗️ Shape Support

Built-in support for BoxShape.circle and high BorderRadius values.

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📜 MIT License

Copyright (c) 2026 Shithin Cp

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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Made with ❤️ by Shithin Cp