flutter 中 oss图片显示处理工具类

// 按照边长缩放
import 'package:yp_erp/Common/Util/image_url_util.dart';

String resizeImageUrlWithLength(String url, int length) {
  if (!url.contains('?')) {
    return url + '?x-oss-process=image/resize,l_$length';
  } else {
    return url + 'x-oss-process=image/resize,l_$length';
  }
}

// 按照高缩放 缩放模式为lfit：m_lfit
String resizeImageUrlWithHeight(String url, int height) {
  if (!url.contains('?')) {
    return url + '?x-oss-process=image/resize,h_$height,m_lfit';
  } else {
    return url + 'x-oss-process=image/resize,h_$height,m_lfit';
  }
}

// 按照宽高缩放 缩放模式fixed：m_fixed (固定宽高缩放)
String resizeImageUrlWithHW(String url, int height, int width) {
  if (!url.contains('?')) {
    return url + '?x-oss-process=image/resize,m_fixed,h_$height,w_$width';
  } else {
    return url + 'x-oss-process=image/resize,m_fixed,h_$height,w_$width';
  }
}

// 按照宽高缩放 缩放模式fill：m_fill(固定宽高，自动裁剪)
String resizeImageUrlFill(String url, int height, int width) {
  // 过滤不规范的url
  String foomatUrl = ImageUrlUtil.formatUrl(url);
  if (!foomatUrl.contains('?')) {
    return foomatUrl + '?x-oss-process=image/resize,m_fill,h_$height,w_$width';
  } else if (foomatUrl.contains('x-oss-process')) {
    return foomatUrl;
  } else {
    return foomatUrl + 'x-oss-process=image/resize,m_fill,h_$height,w_$width';
  }
}

// 按比例缩放
String resizeImageUrProportion(String url, int p) {
  if (!url.contains('?')) {
    return url + '?x-oss-process=image/resize,p_$p';
  } else {
    return url + 'x-oss-process=image/resize,p_$p';
  }
}

// 固定宽高 缩放填充 缩放模式pad：m_pad,colorS 为填充色(例：FFFFFF)
String resizeImageFixdWH(
    String url, int heigth, int width, int p, String colorS) {
  if (!url.contains('?')) {
    return url +
        '?x-oss-process=image/resize,m_pad,h_$heigth,w_$width,color_$colorS';
  } else {
    return url +
        'x-oss-process=image/resize,,m_pad,h_$heigth,w_$width,color_$colorS';
  }
}