Stacked Sheets 📚

An advanced, overlay-driven bottom sheet stack for Flutter. Create fluid, multi-layered experiences with automatic 3D parallax scaling and elegant transitions.

📸 Screenshots

Initial State	Single Sheet	Multiple Sheets

✨ Features

• Layered Stacking: Push multiple bottom sheets on top of each other.
• Parallax Scaling: Background sheets automatically scale down and dim as new layers are added, creating a beautiful depth effect.
• Overlay-Based: Built on Flutter's Overlay system, so it doesn't interfere with your Navigator routes.
• Highly Customizable: Control background colors, border radius, and initial extents for each individual sheet.
• Controller Driven: Manage your sheet stack from anywhere in your code using a simple ChangeNotifier based controller.

🚀 Getting started

Add stacked_sheets to your pubspec.yaml:

dependencies:
  stacked_sheets: ^0.0.1

Or run:

flutter pub add stacked_sheets

🛠 Usage

1. Setup the Coordinator

Wrap your main application widget (usually the one containing your Scaffold) with the StackedSheetCoordinator.

final controller = StackedSheetController();

@override
Widget build(BuildContext context) {
  return StackedSheetCoordinator(
    controller: controller,
    child: Scaffold(
      appBar: AppBar(title: Text('My App')),
      body: Center(
        child: ElevatedButton(
          onPressed: () => _showSheet(),
          child: Text('Open Sheet'),
        ),
      ),
    ),
  );
}

2. Push a Sheet

Use the controller to push a new StackedSheet.

void _showSheet() {
  controller.push(
    StackedSheet(
      initialExtent: 0.7,
      backgroundColor: Colors.white,
      borderRadius: BorderRadius.vertical(top: Radius.circular(24)),
      child: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          children: [
            Text('Hello Stacked Sheet!'),
            ElevatedButton(
              onPressed: () => controller.pop(),
              child: Text('Close'),
            ),
          ],
        ),
      ),
    ),
  );
}

3. Controller Actions

The StackedSheetController provides several methods to manage the stack:

Method	Description
push(StackedSheet)	Adds a new sheet to the top of the stack.
pop()	Removes the topmost sheet.
clear()	Closes all open sheets at once.
sheets	Access the current list of active sheets.

🎨 Customization

The StackedSheet model allows for per-sheet customization:

StackedSheet(
  child: MyWidget(),
  initialExtent: 0.8, // 0.0 to 1.0 (80% of screen height)
  dismissible: true,   // Allow dismissal (WIP)
  backgroundColor: Colors.grey[100]!,
  borderRadius: BorderRadius.circular(12),
);

📂 Example

Check out the example folder for a full implementation demonstrating multiple layers and interactive triggers.

🤝 Contributing

Contributions are welcome! If you find a bug or have a feature request, please open an issue.

📜 License

This project is licensed under the BSD 3-Clause License - see the LICENSE file for details.