VeloeKemonoPartyFlutter/lib/pages/widgets/smart_image_container.dart

import 'package:flutter/material.dart';

class SmartImageContainer extends StatefulWidget {
  final String imageUrl;

  const SmartImageContainer({required this.imageUrl});

  @override
  State<SmartImageContainer> createState() => SmartImageContainerState();
}

class SmartImageContainerState extends State<SmartImageContainer> {
  Size? _imageSize;
  ImageStream? _imageStream;

  @override
  void initState() {
    super.initState();
    _loadImageDimensions();
  }

  void _loadImageDimensions() async {
    final Image image = Image.network(widget.imageUrl);
    _imageStream = image.image.resolve(ImageConfiguration.empty);
    
    _imageStream!.addListener(
      ImageStreamListener((ImageInfo info, _) {
        if (!mounted) return;
        setState(() {
          _imageSize = Size(
            info.image.width.toDouble(),
            info.image.height.toDouble(),
          );
        });
      }),
    );
  }

  @override
  void dispose() {
    //_imageStream?.removeListener(ImageStreamListener(_updateSize));
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (context, constraints) {
        final maxWidth = constraints.maxWidth;
        double calculatedWidth = maxWidth;
        double calculatedHeight = maxWidth;

        if (_imageSize != null) {
          // Auto-sizing logic
          if (_imageSize!.width > maxWidth) {
            // Scale down large images
            final ratio = _imageSize!.height / _imageSize!.width;
            calculatedHeight = maxWidth * ratio;
          } else {
            // Keep original size for smaller images
            calculatedWidth = _imageSize!.width;
            calculatedHeight = _imageSize!.height;
          }
        }

        return AnimatedContainer(
          duration: const Duration(milliseconds: 300),
          width: calculatedWidth,
          height: calculatedHeight,
          alignment: Alignment.center,
          child: _imageSize != null
              ? Image.network(
                  widget.imageUrl,
                  fit: BoxFit.contain,
                  width: calculatedWidth,
                  height: calculatedHeight,
                )
              : _buildLoadingPlaceholder(maxWidth),
        );
      },
    );
  }

  Widget _buildLoadingPlaceholder(double maxWidth) {
    return Container(
      width: maxWidth,
      height: maxWidth * 0.75, // Default 4:3 ratio
      color: Colors.grey[200],
    );
  }
}