初始化

2026-09-15 15:44:13 +07:00
commit a23ba685e9
1065 changed files with 101122 additions and 0 deletions
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+import 'dart:ui';
+
+import 'package:cached_network_image/cached_network_image.dart';
+import 'package:flutter/material.dart';
+import 'package:hgdj/assets_tool/images.dart';
+import 'package:hgdj/hj_utils/screen.dart';
+import 'package:hgdj/tools_base/cache/image_cache_manager.dart';
+
+class NetworkImageLoader extends StatelessWidget {
+  final double borderRadius;
+  final BorderRadius? imgBorderRadius;
+  final String? imageUrl;
+  final double? width;
+  final double? height;
+  final BoxFit fit;
+  final double? placeHolderH;
+  final double? placeHolderW;
+  final bool blur; //高斯模糊
+  final Alignment alignment;
+  final bool encrypt; //是否需要加密
+  final Widget? placeHolderWidget;
+  final int? loadWidth; // 服务端根据宽度等比例压缩
+  final bool? isResizeImage; //是否需要根据组件大小压缩
+
+  const NetworkImageLoader({
+    super.key,
+    required this.imageUrl,
+    this.borderRadius = 8,
+    this.imgBorderRadius,
+    this.height,
+    this.fit = BoxFit.cover,
+    this.width,
+    this.blur = false,
+    this.placeHolderH,
+    this.placeHolderW,
+    this.alignment = Alignment.center,
+    this.encrypt = true,
+    this.placeHolderWidget,
+    this.loadWidth,
+    this.isResizeImage = true,
+  });
+
+  bool get isGif => imageUrl?.contains(".gif") ?? false;
+  String get realImgUrl {
+    if (imageUrl == null) return "";
+    return imageUrl!;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return LayoutBuilder(builder: (context, cons) {
+      final imageWidget = CachedNetworkImage(
+        alignment: alignment,
+        imageUrl: realImgUrl,
+        width: width,
+        height: height,
+        fit: fit,
+        memCacheWidth: memCacheWidth(cons),
+        // 默认 FilterQuality.low 用廉价 bilinear，iOS retina(dpr=3) 上肉眼可见的模糊
+        // medium 是质量/性能平衡点，high 会卡列表滚动
+        filterQuality: FilterQuality.medium,
+        cacheManager: encrypt ? ImageCacheManager() : null,
+        placeholder: (context, url) => _buildPlaceHolder(),
+        errorWidget: (context, url, err) => _buildPlaceHolder(),
+        fadeInCurve: Curves.linear,
+        fadeOutCurve: Curves.linear,
+      );
+      final clip = borderRadius == 0
+          ? imageWidget
+          : ClipRRect(
+              borderRadius:
+                  imgBorderRadius ?? BorderRadius.circular(borderRadius),
+              child: imageWidget,
+            );
+      final backdrop = blur
+          ? ClipRRect(
+              borderRadius:
+                  imgBorderRadius ?? BorderRadius.circular(borderRadius),
+              child: ImageFiltered(
+                imageFilter: ImageFilter.blur(
+                  sigmaX: 5,
+                  sigmaY: 5,
+                ),
+                child: clip,
+              ),
+            )
+          : clip;
+      return backdrop;
+    });
+  }
+
+  //resize的宽度
+  int? memCacheWidth(BoxConstraints cons) {
+    final dpr = screen.devicePixelRatio;
+    if (isResizeImage == true) {
+      //约束无限时用屏幕宽兜底，避免退化成按原图解码（图片过载）
+      final w = (cons.maxWidth == double.infinity || cons.maxWidth.isNaN)
+          ? screen.screenWidth
+          : cons.maxWidth;
+      return (w * dpr).toInt();
+    } else {
+      return loadWidth != null
+          ? loadWidth!
+          : (screen.screenWidth * dpr).toInt();
+    }
+  }
+
+  _buildPlaceHolder() {
+    if (placeHolderWidget != null) return placeHolderWidget;
+    return Container(
+      padding: EdgeInsets.symmetric(horizontal: 4),
+      decoration: BoxDecoration(color: Color(0xff343434)),
+      alignment: Alignment.center,
+      child: Image.asset(
+        'place_holder_logo.webp'.commonImgPath,
+        width: placeHolderW ?? 136,
+        height: placeHolderW ?? 96,
+      ),
+    );
+  }
+}