Shimmer Loading Placeholder

Shimmer Loading Placeholder is a Flutter package that provides a visually appealing shimmer effect for loading states. Instead of displaying empty spaces or spinners, it enhances the user experience by showing placeholders with an animated shimmer effect.

📌 Features

✅ Shimmer effect for loading placeholders
✅ Compatible with any widget
✅ Customizable shimmer colors
✅ Adjustable animation speed
✅ Works seamlessly with ListView and GridView
✅ Supports rounded corners
✅ Configurable shimmer direction (left-to-right or right-to-left)

📦 Installation

Add the following dependency to your pubspec.yaml file:

dependencies:
  shimmer_loading_placeholder: latest_version

🚀 Usage

1️⃣ Basic ShimmerContainer

import 'package:flutter/material.dart';
import 'package:shimmer_loading_placeholder/shimmer_loading_placeholder.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('Shimmer Example')),
        body: Center(
          child: ShimmerContainer(
            child: Container(height: 100, width: 200, color: Colors.grey),
          ),
        ),
      ),
    );
  }
}

2️⃣ Using with ListView

ListView.builder(
  itemCount: 5,
  itemBuilder: (_, index) => const Padding(
    padding: EdgeInsets.symmetric(vertical: 8.0),
    child: ShimmerContainer(
      child: ListTile(
        leading: CircleAvatar(radius: 30),
        title: SizedBox(height: 10, width: 100, child: DecoratedBox(decoration: BoxDecoration(color: Colors.white))),
      ),
    ),
  ),
)

3️⃣ Customizing shimmer colors

ShimmerContainer(
  baseColor: Colors.grey[300]!,
  highlightColor: Colors.grey[100]!,
  child: Container(height: 100, width: 200, color: Colors.grey),
)

4️⃣ Using with GridView

GridView.builder(
  gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 2),
  itemCount: 6,
  itemBuilder: (_, index) => const Padding(
    padding: EdgeInsets.all(8.0),
    child: ShimmerContainer(
      child: SizedBox(height: 100, width: 100, child: DecoratedBox(decoration: BoxDecoration(color: Colors.white))),
    ),
  ),
)

🛠 Configuration

Parameter	Type	Description
child	Widget	The widget inside the shimmer container
baseColor	Color	The base background color
highlightColor	Color	The shimmer highlight color
duration	Duration	Animation duration
borderRadius	BorderRadius	Corner radius customization

🧪 Testing

To run tests, use the following command:

flutter test

📜 License

This project is licensed under the MIT License.

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If you encounter any issues or have feature suggestions, feel free to open an issue on GitHub. 🚀