111 lines
2.4 KiB
JavaScript
111 lines
2.4 KiB
JavaScript
/*
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* @Author: rileycai
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* @Date: 2022-03-14 14:21:26
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* @LastEditTime: 2022-03-14 15:23:04
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* @LastEditors: rileycai
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* @Description: webp-image组件对t-image包裹了一层，主要实现图片裁剪、webp压缩功能
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* @FilePath: /tdesign-miniprogram-starter/components/webp-image/index.js
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*/
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let screenWidth = 375;
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let pixelRatio = 2;
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let screenReady = false;
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function ensureScreen() {
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if (screenReady) {
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return;
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}
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screenReady = true;
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try {
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const info = wx.getWindowInfo();
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screenWidth = info.screenWidth || info.windowWidth || 375;
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pixelRatio = info.pixelRatio || 2;
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} catch (err) {
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screenWidth = 375;
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pixelRatio = 2;
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}
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}
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Component({
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externalClasses: ['t-class', 't-class-load'],
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properties: {
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loadFailed: {
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type: String,
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value: 'default',
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},
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loading: {
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type: String,
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value: 'default',
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},
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src: {
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type: String,
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value: '',
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},
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mode: {
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type: String,
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value: 'aspectFill',
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},
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webp: {
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type: Boolean,
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value: true,
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},
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lazyLoad: {
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type: Boolean,
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value: false,
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},
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showMenuByLongpress: {
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type: Boolean,
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value: false,
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},
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},
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data: {
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thumbHeight: 375,
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thumbWidth: 375,
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screenWidth: 375,
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pixelRatio: 2,
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},
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lifetimes: {
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attached() {
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ensureScreen();
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this.setData({ screenWidth, pixelRatio });
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},
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ready() {
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const { mode } = this.properties;
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// 获取容器的真实宽高，设置图片的裁剪宽度
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this.getRect('.J-image').then((res) => {
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if (res) {
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const { width, height } = res;
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this.setData(
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mode === 'heightFix'
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? {
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thumbHeight: this.px2rpx(height) || 375,
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}
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: {
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thumbWidth: this.px2rpx(width) || 375,
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},
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);
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}
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});
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},
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},
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methods: {
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px2rpx(px) {
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ensureScreen();
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return (750 / (screenWidth || 375)) * px;
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},
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getRect(selector) {
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return new Promise((resolve) => {
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if (!this.selectorQuery) {
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this.selectorQuery = this.createSelectorQuery();
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}
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this.selectorQuery.select(selector).boundingClientRect(resolve).exec();
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});
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},
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onLoad(e) {
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this.triggerEvent('load', e.detail);
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},
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onError(e) {
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this.triggerEvent('error', e.detail);
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},
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},
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});
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