450 lines
14 KiB
Vue
450 lines
14 KiB
Vue
<template>
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<view class="u-qrcode"
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:id="rootId"
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:style="{
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width: useRootHeightAndWidth ? '100%' : 'auto',
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height: useRootHeightAndWidth ? '100%' : 'auto',
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}"
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@longpress="longpress">
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<view class="u-qrcode__content" @click="preview">
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<!-- #ifndef APP-NVUE || APP-PLUS -->
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<canvas
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class="u-qrcode__canvas"
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:id="cid"
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:canvas-id="cid"
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type="2d"
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:style="{ width: sizeLocal + unit, height: sizeLocal + unit }" />
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<!-- #endif -->
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<!-- #ifdef APP-PLUS -->
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<canvas
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class="u-qrcode__canvas"
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:id="cid"
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:canvas-id="cid"
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:style="{ width: sizeLocal + unit, height: sizeLocal + unit }" />
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<!-- #endif -->
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<!-- #ifdef APP-PLUS -->
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<canvas
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class="u-qrcode__canvas"
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:id="cid"
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:canvas-id="cid"
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:style="{ width: sizeLocal + unit, height: sizeLocal + unit }" />
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<!-- #endif -->
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<!-- #ifdef APP-NVUE -->
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<gcanvas class="u-qrcode__canvas" ref="gcanvess"
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:style="{ width: sizeLocal + unit, height: sizeLocal + unit }">
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</gcanvas>
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<!-- #endif -->
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<view v-if="showLoading && loading" class="u-qrcode__loading"
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:style="{ width: sizeLocal + unit, height: sizeLocal + unit }">
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<up-loading-icon vertical :text="loadingText" textSize="14px"></up-loading-icon>
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</view>
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</view>
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</view>
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</template>
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<script>
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import QRCode from "./qrcode.js"
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// #ifdef APP-NVUE
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// https://github.com/dcloudio/NvueCanvasDemo/blob/master/README.md
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import {
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enable,
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WeexBridge
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} from '../../libs/util/gcanvas/index.js';
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// #endif
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let qrcode
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export default {
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name: "u-qrcode",
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props: {
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cid: {
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type: String,
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default: () => `u-qrcode-canvas${Math.floor(Math.random() * 1000000)}`
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},
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size: {
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type: Number,
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default: 200
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},
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unit: {
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type: String,
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default: 'px'
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},
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show: {
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type: Boolean,
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default: true
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},
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val: {
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type: String,
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default: ''
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},
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background: {
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type: String,
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default: '#ffffff'
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},
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foreground: {
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type: String,
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default: '#000000'
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},
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pdground: {
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type: String,
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default: '#000000'
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},
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icon: {
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type: String,
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default: ''
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},
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iconSize: {
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type: Number,
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default: 40
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},
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lv: {
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type: Number,
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default: 3
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},
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onval: {
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type: Boolean,
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default: true
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},
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loadMake: {
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type: Boolean,
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default: true
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},
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usingComponents: {
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type: Boolean,
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default: true
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},
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showLoading: {
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type: Boolean,
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default: true
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},
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loadingText: {
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type: String,
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default: '生成中'
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},
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allowPreview: {
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type: Boolean,
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default: false
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},
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// 是否使用根节点宽高
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useRootHeightAndWidth: {
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type: Boolean,
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default: () => false
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},
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},
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emits: ['result', 'longpressCallback'],
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data() {
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return {
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loading: false,
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result: '',
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popupShow: false,
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list: [
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{
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name: '保存二维码',
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}
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],
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rootId: `rootId${Number(Math.random() * 100).toFixed(0)}`,
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ganvas: null,
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context: '',
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canvasObj: {},
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sizeLocal: this.size,
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ctx: null, // ctx 在new Qrcode 时js文件内部设置
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canvas: null, // ctx 在new Qrcode 时js文件内部设置
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}
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},
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async mounted(){
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// 如果使用根节点的宽高 则 重新设置 size
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if(this.useRootHeightAndWidth){
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await this.setNewSize()
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}
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// #ifdef APP-NVUE
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/*获取元素引用*/
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this.ganvas = this.$refs["gcanvess"]
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/*通过元素引用获取canvas对象*/
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this.canvasObj = enable(this.ganvas, {
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bridge: WeexBridge
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})
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/*获取绘图所需的上下文，目前不支持3d*/
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this.context = this.canvasObj.getContext('2d')
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// #endif
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if (this.loadMake) {
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if (!this._empty(this.val)) {
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setTimeout(() => {
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setTimeout(()=>{
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this._makeCode()
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})
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}, 0);
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}
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}
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},
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methods: {
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_makeCode() {
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let that = this
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if (!this._empty(this.val)) {
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// #ifndef APP-NVUE
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this.loading = true
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// #endif
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qrcode = new QRCode({
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context: that, // 上下文环境
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canvasId: that.cid, // canvas-id
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nvueContext: that.context,
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usingComponents: that.usingComponents, // 是否是自定义组件
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showLoading: false, // 是否显示loading
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loadingText: that.loadingText, // loading文字
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text: that.val, // 生成内容
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size: that.sizeLocal, // 二维码大小
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background: that.background, // 背景色
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foreground: that.foreground, // 前景色
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pdground: that.pdground, // 定位角点颜色
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correctLevel: that.lv, // 容错级别
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image: that.icon, // 二维码图标
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imageSize: that.iconSize,// 二维码图标大小
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cbResult: function (res) { // 生成二维码的回调
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that._result(res)
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},
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});
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} else {
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uni.showToast({
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title: '二维码内容不能为空',
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icon: 'none',
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duration: 2000
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});
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}
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},
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_clearCode() {
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this._result('')
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qrcode.clear()
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},
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_saveCode() {
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let that = this;
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if (this.result != "") {
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uni.saveImageToPhotosAlbum({
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filePath: that.result,
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success: function () {
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uni.showToast({
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title: '二维码保存成功',
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icon: 'success',
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duration: 2000
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});
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}
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});
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}
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},
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preview(e) {
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// 预览图片
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// console.log(this.result)
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if (this.allowPreview) {
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uni.previewImage({
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urls: [this.result],
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longPressActions: {
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itemList: ['保存二维码图片'],
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success: function(data) {
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// console.log('选中了第' + (data.tapIndex + 1) + '个按钮,第' + (data.index + 1) + '张图片');
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switch (data.tapIndex) {
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case 0:
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that._saveCode();
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break;
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}
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},
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fail: function(err) {
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console.log(err.errMsg);
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}
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}
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});
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}
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this.$emit('preview', {
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url: this.result
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}, e)
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},
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async longpress() {
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if (this.context) {
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this.ctx.toTempFilePath(
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0,
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0,
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this.sizeLocal,
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this.sizeLocal,
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this.sizeLocal,
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this.sizeLocal,
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"",
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1,
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res => {
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this.$emit('longpressCallback', res.tempFilePath)
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}
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);
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}
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else {
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// #ifdef MP-TOUTIAO || H5
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this.$emit('longpressCallback', this.ctx.canvas.toDataURL("image/png", 1));
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// #endif
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// #ifdef APP-PLUS
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uni.canvasToTempFilePath(
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{
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canvasId: this.cid,
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success :res => {
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this.$emit('longpressCallback', res.tempFilePath)
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},
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fail: err =>{
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}
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},
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this)
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// #endif
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// #ifndef MP-TOUTIAO || H5 || APP-PLUS
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const canvas = await this.getNode(this.cId,true);
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uni.canvasToTempFilePath(
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{
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canvas,
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success :res => {
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this.$emit('longpressCallback', res.tempFilePath)
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},
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fail: err =>{
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}
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},
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this)
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// #endif
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}
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},
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/**
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* 使用根节点宽高 设置新的size
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* @return {Promise<void>}
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*/
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async setNewSize(){
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const rootNode = await this.getNode(this.rootId,false);
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const { width , height } = rootNode;
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// 将最短的设置为二维码 的size
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if(width > height){
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this.sizeLocal = height
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}
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else{
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this.sizeLocal = width
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}
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},
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/**
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* 获取节点
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* @param id 节点id
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* @param isCanvas 是否为Canvas节点
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* @return {Promise<unknown>}
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*/
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async getNode(id,isCanvas){
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return new Promise((resolve, reject)=>{
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try {
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const query = uni.createSelectorQuery().in(this);
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query.select(`#${id}`)
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.fields({ node: true, size: true })
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.exec((res) => {
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if(isCanvas){
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resolve(res[0].node)
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}
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else{
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resolve(res[0])
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}
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})
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}
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catch (e) {
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console.error("获取节点失败",e)
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}
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})
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},
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selectClick(index) {
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switch (index) {
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case 0:
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alert('保存二维码')
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this._saveCode();
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break;
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}
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},
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_result(res) {
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this.loading = false;
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this.result = res;
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this.$emit('result', res);
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},
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_empty(v) {
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let tp = typeof v,
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rt = false;
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if (tp == "number" && String(v) == "") {
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rt = true
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} else if (tp == "undefined") {
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rt = true
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} else if (tp == "object") {
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if (JSON.stringify(v) == "{}" || JSON.stringify(v) == "[]" || v == null) rt = true
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} else if (tp == "string") {
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if (v == "" || v == "undefined" || v == "null" || v == "{}" || v == "[]") rt = true
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} else if (tp == "function") {
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rt = false
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}
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return rt
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},
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},
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watch: {
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size: function (n, o) {
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if (n != o && !this._empty(n)) {
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this.cSize = n
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if (!this._empty(this.val)) {
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setTimeout(() => {
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this._makeCode()
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}, 100);
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}
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}
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},
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val: function (n, o) {
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if (this.onval) {
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if (n != o && !this._empty(n)) {
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setTimeout(() => {
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this._makeCode()
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}, 0);
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}
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}
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}
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},
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computed: {
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}
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}
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</script>
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<style lang="scss" scoped>
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.u-qrcode {
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&__loading {
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display: flex;
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justify-content: center;
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align-items: center;
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background-color: #f7f7f7;
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position: absolute;
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top: 0;
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bottom: 0;
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left: 0;
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right: 0;
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}
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/* #ifdef MP-TOUTIAO */
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/**字节小程序在编译时会出现一个 [hidde]:{ display: none !important; } 这个样式
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* 会导致canvas 隐藏掉 没有找到具体原因先这样处理
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*/
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&__canvas {
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display: block !important;
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}
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/* #endif */
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&__content {
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position: relative;
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&__canvas {
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position: fixed;
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top: -99999rpx;
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left: -99999rpx;
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z-index: -99999;
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}
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}
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}
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</style>
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