choerodon-ui/es/upload/utils.js

export function T() {
  return true;
} // Fix IE file.status problem
// via coping a new Object

export function fileToObject(file) {
  return {
    lastModified: file.lastModified,
    lastModifiedDate: file.lastModifiedDate,
    name: file.filename || file.name,
    size: file.size,
    type: file.type,
    uid: file.uid,
    response: file.response,
    error: file.error,
    percent: 0,
    originFileObj: file
  };
}
/**
 * 生成Progress percent: 0.1 -> 0.98
 *   - for ie
 */

export function genPercentAdd() {
  var k = 0.1;
  var i = 0.01;
  var end = 0.98;
  return function (s) {
    var start = s;

    if (start >= end) {
      return start;
    }

    start += k;
    k -= i;

    if (k < 0.001) {
      k = 0.001;
    }

    return start * 100;
  };
}
export function getFileItem(file, fileList) {
  var matchKey = file.uid !== undefined ? 'uid' : 'name';
  return fileList.filter(function (item) {
    return item[matchKey] === file[matchKey];
  })[0];
}
export function removeFileItem(file, fileList) {
  var matchKey = file.uid !== undefined ? 'uid' : 'name';
  var removed = fileList.filter(function (item) {
    return item[matchKey] !== file[matchKey];
  });

  if (removed.length === fileList.length) {
    return null;
  }

  return removed;
}

var isImageFileType = function isImageFileType(type) {
  return type.indexOf('image/') === 0;
};

var MEASURE_SIZE = 200;
export function previewImage(file) {
  return new Promise(function (resolve) {
    if (!file.type || !isImageFileType(file.type)) {
      resolve('');
      return;
    }

    var canvas = document.createElement('canvas');
    canvas.width = MEASURE_SIZE;
    canvas.height = MEASURE_SIZE;
    canvas.style.cssText = "position: fixed; left: 0; top: 0; width: ".concat(MEASURE_SIZE, "px; height: ").concat(MEASURE_SIZE, "px; z-index: 9999; display: none;");
    document.body.appendChild(canvas);
    var ctx = canvas.getContext('2d');
    var img = new Image();

    img.onload = function () {
      var width = img.width,
          height = img.height;
      var drawWidth = MEASURE_SIZE;
      var drawHeight = MEASURE_SIZE;
      var offsetX = 0;
      var offsetY = 0;

      if (width < height) {
        drawHeight = height * (MEASURE_SIZE / width);
        offsetY = -(drawHeight - drawWidth) / 2;
      } else {
        drawWidth = width * (MEASURE_SIZE / height);
        offsetX = -(drawWidth - drawHeight) / 2;
      }

      ctx.drawImage(img, offsetX, offsetY, drawWidth, drawHeight);
      var dataURL = canvas.toDataURL();
      document.body.removeChild(canvas);
      resolve(dataURL);
    };

    img.src = window.URL.createObjectURL(file);
  });
}
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