🌫️ glassy_navbar

A beautiful and customizable glassmorphic bottom navigation bar for Flutter apps with blur and transparency effects.

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📸 Preview

📸 Preview

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✨ Features

✅ Fully customizable (icons, labels, colors, blur, opacity)
✅ Supports custom SVG or standard Flutter icons
✅ Optional top border with custom style
✅ Blur effect using BackdropFilter
✅ Works well with Stack layout for layered glass effect
✅ Lightweight and easy to integrate
✅ Compatible with flutter_svg for SVG icons

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🚀 Installation

Add to your pubspec.yaml:

dependencies:
  glassy_navbar: ^0.0.7

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⚙️ Usage

Important:

• Wrap the GlassyNavBar inside a Stack.
• Set resizeToAvoidBottomInset: false in your Scaffold.
• Do not use it in bottomNavigationBar to preserve the blur effect.

✅ Example

import 'package:flutter/material.dart';
import 'package:flutter_svg/svg.dart';
import 'package:glassy_navbar/glassy_navbar.dart';

class BottomNavBarView extends StatefulWidget {
  const BottomNavBarView({super.key});

  @override
  State<BottomNavBarView> createState() => _BottomNavBarViewState();
}

class _BottomNavBarViewState extends State<BottomNavBarView> {
  int currentIndex = 0;

  final List<GlassyNavBarItem> navBarItems = [
    GlassyNavBarItem(
      customUnselectedIcon: SvgPicture.asset('assets/home_unselected.svg'),
      customSelectedIcon: SvgPicture.asset('assets/home_selected.svg'),
      label: 'Home',
    ),
    const GlassyNavBarItem(icon: Icons.search, label: 'Search'),
    const GlassyNavBarItem(icon: Icons.notifications, label: 'Notifications'),
    const GlassyNavBarItem(icon: Icons.person, label: 'Profile'),
    const GlassyNavBarItem(icon: Icons.settings, label: 'Settings'),
  ];

  final List<Widget> screens = [
    Container(),
    Container(),
    Container(),
    Container(),
    Container(),
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      resizeToAvoidBottomInset: false,
      body: Stack(
        children: [
          screens[currentIndex],
          GlassyNavBar(
            currentIndex: currentIndex,
            onItemTap: onNavItemTap,
            items: navBarItems,
            backgroundColor: const Color(0xFF00425C),
            blurSigma: 3,
            height: 70,
            opacity: 0.0,
            showLabels: true,
            selectedLabelStyle: const TextStyle(
              color: Colors.blue,
              fontSize: 12,
            ),
            unselectedLabelStyle: const TextStyle(
              color: Colors.white70,
              fontSize: 12,
            ),
            selectedIconTheme: const IconThemeData(
              color: Colors.blue,
              size: 22,
            ),
            unselectedIconTheme: const IconThemeData(
              color: Colors.white70,
              size: 22,
            ),
            showTopBorder: true,
            topBorderStyle: const TopBorderStyle(
              color: Color.fromARGB(255, 0, 157, 255),
              thickness: 1,
            ),
          ),
        ],
      ),
    );
  }

  void onNavItemTap(int index) {
    setState(() {
      currentIndex = index;
    });
  }
}

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🎨 Parameters

Parameter	Description
currentIndex	Index of the currently selected item
onItemTap	Function to handle tap on item
items	List of GlassmorphicNavBarItem
blurSigma	Blur intensity of the glass effect
backgroundColor	Base background color of the navbar
height	Height of the navigation bar
opacity	Opacity of the background (0.0 = transparent)
showLabels	Whether to show labels below icons
selectedLabelStyle	Text style for selected label
unselectedLabelStyle	Text style for unselected labels
selectedIconTheme	Icon theme for selected item
unselectedIconTheme	Icon theme for unselected items
showTopBorder	Whether to show the top border
topBorderStyle	Custom style for the top border

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📦 Assets

If using custom SVG icons, declare them in pubspec.yaml:

flutter:
  assets:
    - assets/home_selected.svg
    - assets/home_unselected.svg

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❗ Assertion Rules

To avoid runtime errors when using GlassmorphicNavBarItem, follow one of these valid setups:

✅ Option 1 (Material icon):

GlassmorphicNavBarItem(
  icon: Icons.home,
  label: 'Home',
);

✅ Option 2 (Custom icons):

GlassmorphicNavBarItem(
  customUnselectedIcon: SvgPicture.asset('...'),
  customSelectedIcon: SvgPicture.asset('...'),
  label: 'Home',
);

🚫 Do not mix both Material icons and custom icons. The following assertions will protect from misconfiguration:

assert(
  customUnselectedIcon == null || customSelectedIcon != null,
  '\n\ncustomSelectedIcon must also be provided\n',
),
assert(
  customSelectedIcon == null || customUnselectedIcon != null,
  '\n\ncustomUnselectedIcon must also be provided\n',
),
assert(
  (icon != null && customUnselectedIcon == null && customSelectedIcon == null) ||
  (icon == null && customUnselectedIcon != null && customSelectedIcon != null),
  '\nError: Must provide either:\n'
  '1. Just an icon (for Material icons) OR\n'
  '2. Both customUnselectedIcon AND customSelectedIcon (for custom icons)\n'
  'Do not mix both approaches.\n',
);

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💡 Tips

• Use opacity: 0.0 for full glass feel.
• Use inside a Stack for best visual layering.
• Avoid placing over solid opaque containers.
• Add animations or Hero transitions for smoother experience.

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📃 License

MIT License © 2025 — Ammar Ayman