Sonnat/lib/core/widgets/show_image_widget.dart

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

class ShowImageWidget extends StatelessWidget {
  final String imageUrl;
  final _transformationController = TransformationController();
  late TapDownDetails _doubleTapDetails;

  ShowImageWidget(this.imageUrl, {super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black,
      appBar: AppBar(
        leading: GestureDetector(
          child: const Icon(Icons.close, color: Colors.white),
          onTap: () {
            Navigator.pop(context);
          },
        ),
        backgroundColor: Colors.black,
        elevation: 0,
      ),
      body: Center(
        child: GestureDetector(
          onScaleUpdate: (ScaleUpdateDetails details) {},
          onDoubleTap: _handleDoubleTap,
          onDoubleTapDown: _handleDoubleTapDown,
          child: InteractiveViewer(
            minScale: 0.5,
            maxScale: 20,
            panEnabled: false,
            transformationController: _transformationController,
            child: Container(
              height: MediaQuery.of(context).size.height,
              alignment: Alignment.center,
              child: CachedNetworkImage(
                imageUrl: imageUrl,
                fit: BoxFit.fill,
              ),
            ),
          ),
        ),
      ),
    );
  }

  void _handleDoubleTapDown(TapDownDetails details) {
    _doubleTapDetails = details;
  }

  void _handleDoubleTap() {
    if (_transformationController.value != Matrix4.identity()) {
      _transformationController.value = Matrix4.identity();
    } else {
      final position = _doubleTapDetails.localPosition;
      _transformationController.value = Matrix4.identity()
        ..translate(-position.dx * 2, -position.dy * 2)
        ..scale(4.0);
    }
  }
}