116 lines
3.2 KiB
Dart
116 lines
3.2 KiB
Dart
// lib/ui/widgets/lazy_network_image.dart
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import 'package:flutter/material.dart';
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class LazyNetworkImage extends StatefulWidget {
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final String imageUrl;
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final double width;
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final double height;
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final BoxFit fit;
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final Widget? placeholder;
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final Widget? errorWidget;
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final BorderRadius? borderRadius;
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const LazyNetworkImage({
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super.key,
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required this.imageUrl,
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required this.width,
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required this.height,
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this.fit = BoxFit.cover,
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this.placeholder,
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this.errorWidget,
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this.borderRadius,
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});
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@override
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State<LazyNetworkImage> createState() => _LazyNetworkImageState();
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}
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class _LazyNetworkImageState extends State<LazyNetworkImage> {
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bool _shouldLoad = false;
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Widget get _defaultPlaceholder => Container(
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width: widget.width,
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height: widget.height,
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decoration: BoxDecoration(
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color: Colors.grey[200],
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borderRadius: widget.borderRadius,
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),
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child: const Icon(
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Icons.music_note,
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color: Colors.grey,
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size: 24,
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),
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);
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Widget get _defaultErrorWidget => Container(
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width: widget.width,
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height: widget.height,
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decoration: BoxDecoration(
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color: Colors.grey[300],
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borderRadius: widget.borderRadius,
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),
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child: const Icon(
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Icons.broken_image,
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color: Colors.grey,
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size: 24,
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),
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);
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@override
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void initState() {
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super.initState();
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// Delay loading slightly to allow the widget to be built first
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (mounted) {
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setState(() {
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_shouldLoad = true;
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});
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}
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});
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}
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@override
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Widget build(BuildContext context) {
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return ClipRRect(
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borderRadius: widget.borderRadius ?? BorderRadius.zero,
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child: _shouldLoad && widget.imageUrl.isNotEmpty
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? Image.network(
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widget.imageUrl,
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width: widget.width,
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height: widget.height,
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fit: widget.fit,
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cacheWidth: (widget.width * 2).round(), // 2x for better quality on high-DPI
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cacheHeight: (widget.height * 2).round(),
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errorBuilder: (context, error, stackTrace) {
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return widget.errorWidget ?? _defaultErrorWidget;
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},
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loadingBuilder: (context, child, loadingProgress) {
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if (loadingProgress == null) return child;
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return Container(
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width: widget.width,
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height: widget.height,
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decoration: BoxDecoration(
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color: Colors.grey[100],
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borderRadius: widget.borderRadius,
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),
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child: Center(
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child: SizedBox(
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width: widget.width * 0.4,
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height: widget.height * 0.4,
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child: CircularProgressIndicator(
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strokeWidth: 2,
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value: loadingProgress.expectedTotalBytes != null
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? loadingProgress.cumulativeBytesLoaded /
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loadingProgress.expectedTotalBytes!
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: null,
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),
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),
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),
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);
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},
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)
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: widget.placeholder ?? _defaultPlaceholder,
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);
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}
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} |