Allow overflow container more than screen

Question

I have AnimatedContainer inside a Stack widget. I want to change the scale of the MyAnimatedContainer and make it bigger than screen, like image below :

How can I do that ?

Code:

@override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        fit: StackFit.expand,
        children: [            
          AnimatedContainer(
            height: _width,
            width: _height,
            duration: const Duration(milliseconds: 500),
            child: Image.asset('assets/Asset 2.png'),
          ),
        ],
      ),
    );
  }

I try to change width/height but it doesn't work.

Manishyadav · Accepted Answer · 2022-03-02 15:26:09Z

2

The constraints passed into theStack from its parent are tightened using stackfit.expand, So I want you to use stackfit.loose and than change the width and height . Just try if it works for you.

@override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        fit: StackFit.loose,
        children: [            
          AnimatedContainer(
            height: _width,
            width: _height,
            duration: const Duration(milliseconds: 500),
            child: Image.asset('assets/Asset 2.png'),
          ),
        ],
      ),
    );
  }

answered Mar 2, 2022 at 15:26

Manishyadav

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1 Comment

Sadra Kafiri Over a year ago

Thanks. I will try this.

PrzemekTom · Accepted Answer · 2023-03-15 09:05:21Z

@manishyadav solution didn't work for me. My animation was always constrained by the device size. Nonetheless, I achieved what @mohammadsadra-kafiri depicted in the question:

Allow overflow container more than screen

I used CustomPainter with AnimationController. Container from the image is actually RippleBackground in the code and here's full example:

import 'package:flutter/material.dart';

class RippleBackground extends StatefulWidget {
  const RippleBackground({required this.rippleColor, super.key});

  final Color rippleColor;

  @override
  RippleBackgroundState createState() => RippleBackgroundState();
}

class RippleBackgroundState extends State<RippleBackground> with SingleTickerProviderStateMixin {
  late AnimationController _controller;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      duration: const Duration(milliseconds: 400),
      vsync: this,
    )..forward();
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return CustomPaint(
      size: const Size(double.infinity, double.infinity),
      painter: _RipplePainter(
        animation: _controller,
        rippleColor: widget.rippleColor,
      ),
    );
  }
}

class _RipplePainter extends CustomPainter {
  final Animation<double> animation;

  _RipplePainter({required this.animation, required this.rippleColor})
      : _path = Path(),
        _paint = Paint(),
        super(repaint: animation);

  final Color rippleColor;
  final Path _path;
  final Paint _paint;

  @override
  void paint(Canvas canvas, Size size) {
    _paint
      ..color = rippleColor
      ..style = PaintingStyle.fill;

    var centralPoint = Offset(size.width / 2, size.height / 2);
    var radiusOfCircumscribedCircle = centralPoint.distance;

    var value = animation.value;
    if (value >= 0.0 && value <= 1.0) {
      canvas.drawPath(
        _path
          ..addOval(
            Rect.fromCircle(
              center: centralPoint,
              radius: radiusOfCircumscribedCircle * value,
            ),
          ),
        _paint,
      );
    }
  }

  @override
  bool shouldRepaint(_RipplePainter oldDelegate) => false;
}

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