huixiang_app/lib/view_widget/custom_image.dart

import 'dart:io';

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

class MImage extends StatelessWidget {
  final String src;
  final String errorSrc;
  final String fadeSrc;
  final BorderRadius radius;
  final double aspectRatio;
  double width;
  double height;
  final BoxFit fit;
  final bool isCircle;

  double scaleIndex = 2.5;

  MImage(
    this.src, {
    this.errorSrc = "assets/image/default_2_1.png",
    this.fadeSrc = "assets/image/default_2_1.png",
    this.aspectRatio,
    this.width,
    this.height,
    this.fit,
    this.isCircle = false,
    this.radius = BorderRadius.zero,
  });

  @override
  Widget build(BuildContext context) {
    Widget image = LayoutBuilder(
      builder: (context, constraints) {
        String imageUrl = "";
        ///压缩图片
        // if (src != null && src != "" && src.startsWith("http")) {
          // String oper = src.contains("?") ? "" :"?";
          // imageUrl =
          //     "$src$oper/imageMogr2/thumbnail/${constraints.constrainWidth() * scaleIndex}"
          //     "x${constraints.constrainHeight() * scaleIndex}/format/webp/quality/100";
        // }

        ///压缩图片
        if (src != "" && src.startsWith("http")) {
          imageUrl = "$src?imageView2/1/w/${(constraints.constrainWidth() * scaleIndex).toInt()}/h/${(constraints.constrainHeight() * scaleIndex).toInt()}/format/jpg/q/75";
        }

        // print("imageUrl:$imageUrl");
        // print("constrainWidth: ${constraints.constrainWidth()}");
        // print("constrainHeight: ${constraints.constrainHeight()}");

        if (imageUrl == null || imageUrl == "") {
          return Image.asset(
            "assets/image/default_2_1.png",
            fit: fit,
          );
        }
        Widget cachedNetworkImage;
        if (src.startsWith("http")) {
          cachedNetworkImage = CachedNetworkImage(
            imageUrl: imageUrl,
            cacheManager: DefaultCacheManager(),
            fadeInDuration: Duration(milliseconds: 300),
            fadeOutDuration: Duration(milliseconds: 300),
            imageBuilder: (context, provide) {
              return Image(
                image: provide,
                fit: fit,
              );
            },
            errorWidget: (context, error, stackTrace) {
              return Image.asset(
                errorSrc,
                fit: fit,
              );
            },
            placeholder: (context, placeholder) {
              return Image.asset(
                fadeSrc,
                fit: fit,
              );
            },
          );
        } else if (src.startsWith("file")) {
          cachedNetworkImage = Image.file(
            File(src),
            fit: fit,
            errorBuilder: (context, error, stackTrace) {
              return Image.asset(
                errorSrc,
                fit: fit,
              );
            },
          );
        }
        return cachedNetworkImage;
      },
    );

    var clipRRect;
    if (isCircle) {
      clipRRect = ClipOval(clipBehavior: Clip.antiAlias, child: image);
    } else {
      clipRRect = ClipRRect(
        borderRadius: radius,
        child: image,
      );
    }
    if (aspectRatio != null && aspectRatio > 0) {
      return Container(
        child: AspectRatio(
          aspectRatio: aspectRatio,
          child: clipRRect,
        ),
      );
    } else {
      return Container(
        width: width,
        height: height,
        child: clipRRect,
      );
    }
  }
}