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131 lines
3.2 KiB
131 lines
3.2 KiB
export function T() {
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return true;
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}
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// Fix IE file.status problem
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// via coping a new Object
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export function fileToObject(file) {
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return {
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...file,
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lastModified: file.lastModified,
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lastModifiedDate: file.lastModifiedDate,
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name: file.name,
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size: file.size,
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type: file.type,
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uid: file.uid,
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percent: 0,
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originFileObj: file,
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};
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}
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/**
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* 生成Progress percent: 0.1 -> 0.98
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* - for ie
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*/
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export function genPercentAdd() {
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let k = 0.1;
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const i = 0.01;
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const end = 0.98;
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return function(s) {
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let start = s;
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if (start >= end) {
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return start;
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}
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start += k;
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k = k - i;
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if (k < 0.001) {
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k = 0.001;
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}
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return start;
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};
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}
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export function getFileItem(file, fileList) {
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const matchKey = file.uid !== undefined ? 'uid' : 'name';
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return fileList.filter(item => item[matchKey] === file[matchKey])[0];
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}
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export function removeFileItem(file, fileList) {
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const matchKey = file.uid !== undefined ? 'uid' : 'name';
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const removed = fileList.filter(item => item[matchKey] !== file[matchKey]);
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if (removed.length === fileList.length) {
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return null;
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}
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return removed;
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}
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// ==================== Default Image Preview ====================
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const extname = (url = '') => {
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const temp = url.split('/');
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const filename = temp[temp.length - 1];
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const filenameWithoutSuffix = filename.split(/#|\?/)[0];
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return (/\.[^./\\]*$/.exec(filenameWithoutSuffix) || [''])[0];
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};
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const isImageFileType = type => !!type && type.indexOf('image/') === 0;
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export const isImageUrl = file => {
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if (isImageFileType(file.type)) {
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return true;
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}
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const url = file.thumbUrl || file.url;
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const extension = extname(url);
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if (
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/^data:image\//.test(url) ||
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/(webp|svg|png|gif|jpg|jpeg|jfif|bmp|dpg|ico)$/i.test(extension)
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) {
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return true;
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}
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if (/^data:/.test(url)) {
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// other file types of base64
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return false;
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}
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if (extension) {
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// other file types which have extension
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return false;
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}
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return true;
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};
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const MEASURE_SIZE = 200;
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export function previewImage(file) {
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return new Promise(resolve => {
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if (!isImageFileType(file.type)) {
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resolve('');
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return;
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}
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const canvas = document.createElement('canvas');
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canvas.width = MEASURE_SIZE;
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canvas.height = MEASURE_SIZE;
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canvas.style.cssText = `position: fixed; left: 0; top: 0; width: ${MEASURE_SIZE}px; height: ${MEASURE_SIZE}px; z-index: 9999; display: none;`;
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document.body.appendChild(canvas);
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const ctx = canvas.getContext('2d');
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const img = new Image();
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img.onload = () => {
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const { width, height } = img;
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let drawWidth = MEASURE_SIZE;
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let drawHeight = MEASURE_SIZE;
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let offsetX = 0;
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let offsetY = 0;
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if (width < height) {
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drawHeight = height * (MEASURE_SIZE / width);
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offsetY = -(drawHeight - drawWidth) / 2;
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} else {
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drawWidth = width * (MEASURE_SIZE / height);
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offsetX = -(drawWidth - drawHeight) / 2;
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}
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ctx.drawImage(img, offsetX, offsetY, drawWidth, drawHeight);
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const dataURL = canvas.toDataURL();
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document.body.removeChild(canvas);
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resolve(dataURL);
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};
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img.src = window.URL.createObjectURL(file);
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});
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}
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