z-react-ui/lib/_utils/checkImageFileWH.js

z-react-ui，是一款基于 Dumi，由 React + TypeScript 开发的组件库 🎉。

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

/**
 * @description 限制图片的宽高
 * @author ronffy
 * @param {file: RcFile, option: CheckImageFileWHOption}
 * @return {Promise<void>}
 */
function checkImageFileWH(file, _ref) {
  var width = _ref.width,
      height = _ref.height,
      maxHeight = _ref.maxHeight,
      maxWidth = _ref.maxWidth,
      _ref$deviation = _ref.deviation,
      deviation = _ref$deviation === void 0 ? 2 : _ref$deviation;
  return new Promise(function (resolve, reject) {
    if (!width && !height && !maxHeight && !maxWidth) {
      resolve();
      return;
    }

    var filereader = new FileReader();

    filereader.onload = function (e) {
      var src = e.target.result;
      var image = new Image();

      image.onload = function () {
        var imgWidth = image.width;
        var imgHeight = image.height;

        if (Math.abs(width - imgWidth) > deviation) {
          reject('width');
          return;
        }

        if (Math.abs(height - imgHeight) > deviation) {
          reject('height');
          return;
        }

        if (maxWidth + deviation < imgWidth) {
          reject('maxWidth');
          return;
        }

        if (maxHeight + deviation < imgHeight) {
          reject('maxHeight');
          return;
        }

        resolve();
      };

      image.src = src;
      image.onerror = reject;
    };

    filereader.readAsDataURL(file);
  });
}

var _default = checkImageFileWH;
exports.default = _default;