ant-design-vue/components/upload/utils.jsx

131 lines
3.2 KiB
Vue

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