105 lines
2.9 KiB
Dart
105 lines
2.9 KiB
Dart
import 'package:cached_network_image/cached_network_image.dart';
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import 'package:flutter/material.dart';
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import 'package:shadcn_ui/shadcn_ui.dart';
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/// 金值统一的网络图片入口。
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///
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/// 图片会自动使用 [CachedNetworkImage] 的磁盘缓存；业务页面不应直接创建
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/// `Image.network`，以保证加载和失败状态的视觉及缓存策略一致。
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class AppNetworkImage extends StatelessWidget {
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const AppNetworkImage({
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super.key,
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required this.imageUrl,
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this.width,
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this.height,
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this.fit = BoxFit.cover,
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this.alignment = Alignment.center,
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this.borderRadius,
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this.cacheKey,
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this.httpHeaders,
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this.placeholder,
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this.errorWidget,
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this.semanticLabel,
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});
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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 Alignment alignment;
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final BorderRadius? borderRadius;
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final String? cacheKey;
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final Map<String, String>? httpHeaders;
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final Widget? placeholder;
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final Widget? errorWidget;
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final String? semanticLabel;
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@override
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Widget build(BuildContext context) {
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final child = imageUrl.trim().isEmpty
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? _ImageFallback(errorWidget: errorWidget)
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: CachedNetworkImage(
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imageUrl: imageUrl,
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cacheKey: cacheKey,
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httpHeaders: httpHeaders,
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width: width,
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height: height,
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fit: fit,
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alignment: alignment,
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fadeInDuration: const Duration(milliseconds: 150),
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placeholder: (_, _) =>
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placeholder ?? const _ImageLoadingPlaceholder(),
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errorWidget: (_, _, _) => _ImageFallback(errorWidget: errorWidget),
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);
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final clipped = borderRadius == null
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? child
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: ClipRRect(borderRadius: borderRadius!, child: child);
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if (semanticLabel == null) return clipped;
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return Semantics(image: true, label: semanticLabel, child: clipped);
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}
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}
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class _ImageLoadingPlaceholder extends StatelessWidget {
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const _ImageLoadingPlaceholder();
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@override
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Widget build(BuildContext context) {
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final colors = ShadTheme.of(context).colorScheme;
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return ColoredBox(
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color: colors.muted,
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child: Center(
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child: SizedBox(
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width: 20,
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height: 20,
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child: CircularProgressIndicator(
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strokeWidth: 2,
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color: colors.mutedForeground,
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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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class _ImageFallback extends StatelessWidget {
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const _ImageFallback({required this.errorWidget});
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final Widget? errorWidget;
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@override
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Widget build(BuildContext context) {
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if (errorWidget != null) return errorWidget!;
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final colors = ShadTheme.of(context).colorScheme;
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return ColoredBox(
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color: colors.muted,
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child: Center(
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child: Icon(
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Icons.image_not_supported_outlined,
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color: colors.mutedForeground,
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),
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),
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);
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}
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}
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