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| <template>
| <view class="u-qrcode"
| :id="rootId"
| :style="{
| width: useRootHeightAndWidth ? '100%' : 'auto',
| height: useRootHeightAndWidth ? '100%' : 'auto',
| }"
| @longpress="longpress">
| <view class="u-qrcode__content" @click="preview">
| <!-- #ifdef MP || H5 -->
| <canvas
| class="u-qrcode__canvas"
| :id="cid"
| :canvas-id="cid"
| type="2d"
| :style="{ width: sizeLocal + unit, height: sizeLocal + unit }" />
| <!-- #endif -->
|
| <!-- #ifdef APP-PLUS -->
| <canvas
| class="u-qrcode__canvas"
| :id="cid"
| :canvas-id="cid"
| :style="{ width: sizeLocal + unit, height: sizeLocal + unit }" />
| <!-- #endif -->
|
| <!-- #ifdef APP-NVUE -->
| <web-view v-if="icon != ''" ref="web" src="/static/app-plus/up-canvas/local.html"
| :style="'width:' + sizeLocal + 'px;height:' + sizeLocal + 'px'"
| @onPostMessage="_onMessage" />
| <gcanvas v-else class="u-qrcode__canvas" ref="gcanvess"
| :style="{ width: sizeLocal + unit, height: sizeLocal + unit }">
| </gcanvas>
| <!-- #endif -->
| <view v-if="showLoading && loading" class="u-qrcode__loading"
| :style="{ width: sizeLocal + unit, height: sizeLocal + unit }">
| <up-loading-icon vertical :text="loadingText" textSize="14px"></up-loading-icon>
| </view>
| </view>
|
| </view>
| </template>
|
| <script>
| import QRCode from "./qrcode.js"
| import { sleep } from '../../libs/function/index';
| // #ifdef APP-NVUE
| // https://github.com/dcloudio/NvueCanvasDemo/blob/master/README.md
| import {
| enable,
| WeexBridge,
| Image as GImage
| } from '../../libs/util/gcanvas/index.js';
| import { nextTick } from "vue";
| // #endif
| let qrcode
| // 20260201不能在data中存储canvas，否则会导致在微信小程序getContext获取不到canvas对象报错Cannot read property 'type'
| let canvas = null
| export default {
| name: "u-qrcode",
| props: {
| cid: {
| type: String,
| default: () => {
| return `u-qrcode-canvas${Math.floor(Math.random() * 1000000)}`
| }
| },
| size: {
| type: Number,
| default: 200
| },
| unit: {
| type: String,
| default: 'px'
| },
| show: {
| type: Boolean,
| default: true
| },
| val: {
| type: String,
| default: ''
| },
| background: {
| type: String,
| default: '#ffffff'
| },
| foreground: {
| type: String,
| default: '#000000'
| },
| pdground: {
| type: String,
| default: '#000000'
| },
| icon: {
| type: String,
| default: ''
| },
| iconSize: {
| type: Number,
| default: 40
| },
| lv: {
| type: Number,
| default: 3
| },
| onval: {
| type: Boolean,
| default: true
| },
| loadMake: {
| type: Boolean,
| default: true
| },
| usingComponents: {
| type: Boolean,
| default: true
| },
| showLoading: {
| type: Boolean,
| default: true
| },
| loadingText: {
| type: String,
| default: '生成中'
| },
| allowPreview: {
| type: Boolean,
| default: false
| },
| // 是否使用根节点宽高
| useRootHeightAndWidth: {
| type: Boolean,
| default: () => false
| },
| },
| emits: ['preview', 'result', 'longpressCallback'],
| data() {
| return {
| loading: false,
| result: '',
| popupShow: false,
| list: [
| {
| name: '保存二维码',
| }
| ],
| rootId: `rootId${Number(Math.random() * 100).toFixed(0)}`,
| ganvas: null,
| canvasObj: {},
| sizeLocal: this.size,
| ctx: null,
| _ready: false
| }
| },
| async mounted(){
| // 如果使用根节点的宽高 则 重新设置 size
| if(this.useRootHeightAndWidth){
| await this.setNewSize()
| }
| canvas = await this.getCanvasNode(this.cid)
|
| if (!canvas) return
| // #ifdef MP
| // 不清楚是小程序的bug还是什么原因，canvas的node节点宽高和设置的宽高不一致 重新设置下
| canvas.width = this.sizeLocal
| canvas.height = this.sizeLocal
| // #endif
| // #ifdef APP-PLUS-NVUE
| this.isNvue = true
| // #endif
| this.ctx = this.getUPCanvasContext('2d')
|
| if (this.loadMake) {
| if (!this._empty(this.val)) {
| setTimeout(() => {
| setTimeout(()=>{
| this._makeCode()
| })
| }, 0);
| }
| }
| },
| methods: {
| _onMessage(e) {
| // console.log('post message', e)
| const message = e.detail.data[0]
| switch (message.action) {
| // web-view 初始化完毕
| case 'onJSBridgeReady':
| this._ready = true
| this.$refs.web.evalJs('setContent('+JSON.stringify(this.$props) +')')
| break
| // qrcodeOk
| case 'qrcodeOk':
| this._result(message.imageData)
| // this.$emit('load')
| break
| }
| },
| _makeCode() {
| let that = this
| if (!canvas) return
| if (!this._empty(this.val)) {
| // #ifndef APP-NVUE
| this.loading = true
| // #endif
| // nvue下时因为gcanvas的GImage不生效，因此icon模式会采用webview
| if ((this.icon == '' && that.isNvue) || !that.isNvue) {
| qrcode = new QRCode({
| vuectx: that, // 上下文环境
| canvasId: that.cid, // canvas-id
| ctx: that.ctx,
| isNvue: that.isNvue,
| usingComponents: that.usingComponents, // 是否是自定义组件
| showLoading: false, // 是否显示loading
| loadingText: that.loadingText, // loading文字
| text: that.val, // 生成内容
| size: that.sizeLocal, // 二维码大小
| background: that.background, // 背景色
| foreground: that.foreground, // 前景色
| pdground: that.pdground, // 定位角点颜色
| correctLevel: that.lv, // 容错级别
| image: that.icon, // 二维码图标
| imageSize: that.iconSize,// 二维码图标大小
| cbResult: function (res) { // 生成二维码的回调
| that._result(res)
| },
| });
| }
| } else {
| uni.showToast({
| title: '二维码内容不能为空',
| icon: 'none',
| duration: 2000
| });
| }
| },
| _clearCode() {
| this._result('')
| qrcode.clear()
| },
| _saveCode() {
| let that = this;
| if (this.result != "") {
| uni.saveImageToPhotosAlbum({
| filePath: that.result,
| success: function () {
| uni.showToast({
| title: '二维码保存成功',
| icon: 'success',
| duration: 2000
| });
| }
| });
| } else {
| this.toTempFilePath({
| success: res => {
| that.result = res.tempFilePath
| uni.saveImageToPhotosAlbum({
| filePath: that.result,
| success: function () {
| uni.showToast({
| title: '二维码保存成功',
| icon: 'success',
| duration: 2000
| });
| }
| });
| },
| fail: err => {
| }
| })
| }
| },
| preview(e) {
| // 预览图片
| // console.log(this.result)
| if (this.allowPreview) {
| uni.previewImage({
| urls: [this.result],
| longPressActions: {
| itemList: ['保存二维码图片'],
| success: function(data) {
| // console.log('选中了第' + (data.tapIndex + 1) + '个按钮,第' + (data.index + 1) + '张图片');
| switch (data.tapIndex) {
| case 0:
| that._saveCode();
| break;
| }
| },
| fail: function(err) {
| console.log(err.errMsg);
| }
| }
| });
| }
| this.$emit('preview', {
| url: this.result
| }, e)
| },
| async toTempFilePath({success, fail}) {
| if (this.ct) {
| this.ctx.toTempFilePath(
| 0,
| 0,
| this.sizeLocal,
| this.sizeLocal,
| this.sizeLocal,
| this.sizeLocal,
| "",
| 1,
| res => {
| success(res)
| }
| );
| }
| else {
| // #ifdef H5
| success({
| tempFilePath: this.ctx.canvas.toDataURL("image/png", 1)
| })
| // #endif
|
| // #ifndef H5
| uni.canvasToTempFilePath(
| {
| canvasId: this.cid,
| success :res => {
| success(res)
| },
| fail: fail
| },
| this)
| // #endif
| }
| },
| async longpress() {
| this.toTempFilePath({
| success: res => {
| this.$emit('longpressCallback', res.tempFilePath)
| },
| fail: err => {
| }
| })
| },
|
| /**
| * 使用根节点宽高 设置新的size
| * @return {Promise<void>}
| */
| async setNewSize(){
| const rootNode = await this.getCanvasNode(this.rootId, false);
| const { width , height } = rootNode;
| // 将最短的设置为二维码 的size
| if(width > height){
| this.sizeLocal = height
| }
| else{
| this.sizeLocal = width
| }
| },
|
| /**
| * 获取节点
| * @param id 节点id
| * @param isCanvas 是否为Canvas节点
| * @return {Promise<unknown>}
| */
| async getCanvasNode(id, isCanvas = true) {
| let that = this
| return new Promise((resolve, reject) => {
| try {
| // #ifdef APP-NVUE
| setTimeout(() => {
| /*获取元素引用*/
| this.ganvas = this.$refs["gcanvess"]
| /*通过元素引用获取canvas对象*/
| let canvasNode = enable(this.ganvas, {
| bridge: WeexBridge
| })
| resolve(canvasNode)
| }, 200)
| // #endif
| // #ifndef APP-PLUS-NVUE
| const query = uni.createSelectorQuery().in(that).select(`#${id}`);
| query.fields({
| node: true,
| size: true
| })
| .exec((res) => {
| if (isCanvas) {
| if (res[0]?.node) {
| resolve(res[0].node)
| } else {
| resolve(false)
| console.error("获取节点出错", res)
| }
| } else {
| resolve(res[0])
| }
| })
| // #endif
| } catch (e) {
| console.error("获取节点失败", e)
| }
| })
| },
| getUPCanvasContext() {
| // #ifdef APP-PLUS
| return uni.createCanvasContext(this.cid, this);
| // #endif
| // #ifdef APP-PLUS-NVUE || MP || H5
| return canvas.getContext('2d');
| // #endif
| },
| drawImage(url, x, y, w, h) {
| try {
| let img = {}
| // #ifdef APP-NVUE
| img = new GImage();
| // #endif
|
| // #ifdef H5
| // APP下不支持会一直卡住
| img = new Image();
| // #endif
|
| // #ifdef MP
| // 小程序2d
| // https://developers.weixin.qq.com/miniprogram/dev/api/canvas/Canvas.createImage.html
| img = canvas.createImage();
| // #endif
| // #ifdef APP-NVUE
| let that = this
| // console.log(img)
| img.onload = function(){
| if (process.env.NODE_ENV === 'development') {
| console.log('drawImage绘制2...')
| }
| that.cxt.drawImage(img, x, y, w, h);
| }
| // #endif
| // #ifdef H5 || MP
| img.onload = () => {
| this.ctx.drawImage(img, x, y, w, h);
| };
| // #endif
| img.src = url;
| // #ifdef APP-VUE
| this.ctx.drawImage(url, x, y, w, h);
| // #endif
| } catch (error) {
| console.log('drawImage绘制出错', error)
| }
| },
|
| selectClick(index) {
| switch (index) {
| case 0:
| alert('保存二维码')
| this._saveCode();
| break;
| }
| },
| _result(res) {
| this.loading = false;
| this.result = res;
| this.$emit('result', res);
| },
| _empty(v) {
| let tp = typeof v,
| rt = false;
| if (tp == "number" && String(v) == "") {
| rt = true
| } else if (tp == "undefined") {
| rt = true
| } else if (tp == "object") {
| if (JSON.stringify(v) == "{}" || JSON.stringify(v) == "[]" || v == null) rt = true
| } else if (tp == "string") {
| if (v == "" || v == "undefined" || v == "null" || v == "{}" || v == "[]") rt = true
| } else if (tp == "function") {
| rt = false
| }
| return rt
| },
| },
| watch: {
| size: function (n, o) {
| if (n != o && !this._empty(n)) {
| this.cSize = n
| if (!this._empty(this.val)) {
| setTimeout(() => {
| this._makeCode()
| }, 100);
| }
| }
| },
| val: function (n, o) {
| if (this.onval) {
| if (n != o && !this._empty(n)) {
| setTimeout(() => {
| this._makeCode()
| }, 0);
| }
| }
| }
| },
| computed: {
| }
| }
| </script>
| <style lang="scss" scoped>
| .u-qrcode {
| &__loading {
| display: flex;
| justify-content: center;
| align-items: center;
| background-color: #f7f7f7;
| position: absolute;
| top: 0;
| bottom: 0;
| left: 0;
| right: 0;
| }
|
| /* #ifdef MP-TOUTIAO */
| /**字节小程序在编译时会出现一个 [hidde]:{ display: none !important; } 这个样式
| * 会导致canvas 隐藏掉 没有找到具体原因先这样处理
| */
| &__canvas {
| display: block !important;
| }
| /* #endif */
|
| &__content {
| position: relative;
|
| &__canvas {
| position: fixed;
| top: -99999rpx;
| left: -99999rpx;
| z-index: -99999;
| }
| }
| }
| </style>
|
|
