A simple, lightweight, and fully customizable widget designed to shrink and expand a view/screen/widget programmatically. ✨

Similar to how iOS shrinks pages behind content in the foreground. Mainly intended to wrap Scaffold widgets.

-> Submit an issue here. -> Create a pull request here. -> Contact me via email here.

Features 🔥

• Shrinks and expands a view/screen/widget.
• Controlled programmatically with a ShrinkingViewController.
• Requires only a few lines of code - simplicity is beautiful.

Gif Demos 📸

Getting Started 📜

1. Install and import the package.
   

   $ flutter pub add shrinking_view
   
   import 'package:shrinking_view/shrinking_view.dart';
   

   
   

2. In your app, create a ShrinkingViewController to pass to the ShrinkingView like so:
   

   late ShrinkingViewController controller; // <--- Create a ShrinkingViewController.
   
       @override
       void initState() {
           controller = ShrinkingViewController(tickerProvider: this); // <-- Initialize it with a TickerProvider.
           super.initState();
       }
   

   Note: Make sure your class is using either a SingleTickerProviderStateMixin or TickerProviderStateMixin so you can pass in this as the TickerProvider as required by the ShrinkingViewController.
   

3. Wrap your Scaffold (or any widget, but Scaffold is recommended) inside the ShrinkingView, passing in the controller you just created.
   

   return ShrinkingView(
     controller: controller,
     child: const Scaffold(
       body: <YOUR_APP>,
     ),
   );
   

   
   

4. You're done! You can now call controller.<SOME_METHOD> to control your ShrinkingView! 🎉

ShrinkingViewController Methods 🛠️

• shrink() => void: Starts the shrinking animation.
  
• expand() => void: Starts the expanding animation.
  
• isShrunk() => bool: Returns true if the last static state was shrunk. For example, if the ShrinkingView is currently animating, this will reflect the state before the animation began.
  
• isExpanded() => bool: Returns true if the last static state was expanded. For example, if the ShrinkingView is currently animating, this will reflect the state before the animation began.
  
• isAnimating() => bool: Returns true if the ShrinkingView is currently animating.
  
• isShrinkingCurrently() => bool: Returns true if the ShrinkingView is currently shrinking.
  
• isExpandingCurrently() => bool: Returns true if the ShrinkingView is currently expanding.

ShrinkingView Properties 🛠️

• (required) controller: The ShrinkingViewController you must pass in order to control the ShrinkingView. No default value, as it's a required field.
  
• (required) child: The Widget you must pass that wraps what you want to be shrunk/expanded. Usually, this is a Scaffold. No default value, as it's a required field.
  
• topLeftSquared: Whether the top left of the widget should have no BorderRadius applied. Default: false.
  
• topRightSquared: Whether the top right of the widget should have no BorderRadius applied. Default: false.
  
• bottomRightSquared: Whether the bottom right of the widget should have no BorderRadius applied. Default: true.
  
• bottomLeftSquared: Whether the bottom left of the widget should have no BorderRadius. Default: true.
  
• safeAreaTop: Whether the widget should automatically add a top SafeArea. Default: false.
  
• safeAreaBottom: Whether the widget should automatically add a bottom SafeArea. Default: false.
  
• safeAreaLeft: Whether the widget should automatically add a left SafeArea. Default: false.
  
• safeAreaRight: Whether the widget should automatically add a right SafeArea. Default: false.
  
• backgroundColorWhileAnimating: The background Color behind the passed child widget that is (usually; depending on your implementation) displayed when a shrinking/expanding animation is occuring. Default: Colors.black.
  
• maintainBottomViewPadding: Specifies whether the SafeArea should maintain the bottom MediaQueryData.viewPadding instead of the bottom MediaQueryData.padding. Default: true.
  
• shrinkingAnimationCurve: The Animation Curve that's used when a shrinking animation is occuring. Default: Curves.decelerate.
  
• expandingAnimationCurve: The Animation Curve that's used when an expanding animation is occuring. Default: Curves.linear.
  
• verticalTranslateMultiplier: The factor by how much down the child should translate. This is proportionate to the screen height (translation down: screen height * verticalTranslateMultiplier). Default: 0.055.
  
• scaleMultiplier: The factor by how much smaller the child should get while shrinking. Example: 0.5 means the child would get 50% smaller, 0.25 means it would get 25% smaller. Default: 0.04.
  
• borderRadiusValue: The circular BorderRadius value each of the 4 corners can animate to (if their respective <Their_Side>Squared property is false). Default: 50.0.

Example ✍️

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

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

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

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'shrinking_view package',
      home: HomePage(),
    );
  }
}

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

  @override
  State<HomePage> createState() => _HomePageState();
}

// Ensure you use either SingleTickerProviderStateMixin or TickerProviderStateMixin.
class _HomePageState extends State<HomePage> with SingleTickerProviderStateMixin {
  late ShrinkingViewController controller; // <--- Create a ShrinkingViewController.

  @override
  void initState() {
    controller = ShrinkingViewController(tickerProvider: this); // <-- Initialize it with a TickerProvider.
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return ShrinkingView(
      // <--- Wrap your widget (usually a Scaffold) with the ShrinkingView.
      controller: controller, // <--- Pass it the controller.
      child: Scaffold(
        appBar: AppBar(
          title: const Text("shrinking_view example"),
        ),
        body: Center(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.center,
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              TextButton(
                onPressed: () => controller.expand(), // <--- Expand the ShrinkingView.
                child: const Text("Expand (void)"),
              ),
              TextButton(
                onPressed: () => controller.shrink(), // <--- Shrink the ShrinkingView.
                child: const Text("Shrink (void)"),
              ),
              TextButton(
                onPressed: () => print(controller.isShrunk()), // <--- Is it shrunk?
                child: const Text("Is shrunk? (bool)"),
              ),
              TextButton(
                onPressed: () => print(controller.isExpanded()), // <--- Is it expanded?
                child: const Text("Is expanded? (bool)"),
              ),
              TextButton(
                onPressed: () => print(controller.isAnimating()), // <--- Is it animating?
                child: const Text("Is animating? (bool)"),
              ),
              TextButton(
                onPressed: () => print(controller.isShrinkingCurrently()), // <--- Is it currently shrinking?
                child: const Text("Is currently shrinking? (bool)"),
              ),
              TextButton(
                onPressed: () => print(controller.isExpandingCurrently()), // <--- Is it currently expanding?
                child: const Text("Is currently expanding? (bool)"),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

Additional information 📣

The package is always open to improvements and suggestions! Hope you enjoy :)