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| <template>
| <view class="u-qrcode" @longpress="longpress">
| <view class="u-qrcode__content" @click="preview">
| <!-- #ifndef APP-NVUE -->
| <canvas class="u-qrcode__canvas"
| :id="cid" :canvas-id="cid" :style="{ width: size + unit, height: size + unit }" />
| <!-- #endif -->
| <!-- #ifdef APP-NVUE -->
| <gcanvas class="u-qrcode__canvas" ref="gcanvess"
| :style="{ width: size + unit, height: size + unit }">
| </gcanvas>
| <!-- #endif -->
| <view v-if="showLoading && loading" class="u-qrcode__loading"
| :style="{ width: size + unit, height: size + unit }">
| <up-loading-icon vertical :text="loadingText" textSize="14px"></up-loading-icon>
| </view>
| <!-- <image v-show="show" :src="result" :style="{ width: size + unit, height: size + unit }" /> -->
| </view>
| <!-- <up-action-sheet :actions="list" cancelText="取消"
| v-model:show="popupShow" @select="selectClick">
| </up-action-sheet> -->
| </view>
| </template>
|
| <script>
| import QRCode from "./qrcode.js"
| // #ifdef APP-NVUE
| // https://github.com/dcloudio/NvueCanvasDemo/blob/master/README.md
| import {
| enable,
| WeexBridge
| } from '../../libs/util/gcanvas/index.js';
| // #endif
| let qrcode
| export default {
| name: "u-qrcode",
| props: {
| cid: {
| type: String,
| default: 'u-qrcode-canvas' + Math.random().toString()
| },
| 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
| },
| },
| emits: ['result', 'longpress'],
| data() {
| return {
| loading: false,
| result: '',
| popupShow: false,
| list: [
| {
| name: '保存二维码',
| }
| ],
| ganvas: null,
| context: '',
| canvasObj: {}
| }
| },
| mounted: function () {
| // #ifdef APP-NVUE
| /*获取元素引用*/
| this.ganvas = this.$refs["gcanvess"]
| /*通过元素引用获取canvas对象*/
| this.canvasObj = enable(this.ganvas, {
| bridge: WeexBridge
| })
| /*获取绘图所需的上下文，目前不支持3d*/
| this.context = this.canvasObj.getContext('2d')
| // #endif
|
| if (this.loadMake) {
| if (!this._empty(this.val)) {
| setTimeout(() => {
| this._makeCode()
| }, 0);
| }
| }
| },
| methods: {
| _makeCode() {
| let that = this
| if (!this._empty(this.val)) {
| // #ifndef APP-NVUE
| this.loading = true
| // #endif
| qrcode = new QRCode({
| context: that, // 上下文环境
| canvasId: that.cid, // canvas-id
| nvueContext: that.context,
| usingComponents: that.usingComponents, // 是否是自定义组件
| showLoading: false, // 是否显示loading
| loadingText: that.loadingText, // loading文字
| text: that.val, // 生成内容
| size: that.size, // 二维码大小
| background: that.background, // 背景色
| foreground: that.foreground, // 前景色
| pdground: that.pdground, // 定位角点颜色
| correctLevel: that.lv, // 容错级别
| image: that.icon, // 二维码图标
| imageSize: that.iconSize,// 二维码图标大小
| cbResult: function (res) { // 生成二维码的回调
| that._result(res)
| },
| });
| } else {
| uni.showToast({
| title: '二维码内容不能为空',
| icon: 'none',
| duration: 2000
| });
| }
| },
| _clearCode() {
| this._result('')
| qrcode.clear()
| },
| _saveCode() {
| let that = this;
| if (this.result != "") {
| uni.saveImageToPhotosAlbum({
| filePath: that.result,
| success: function () {
| uni.showToast({
| title: '二维码保存成功',
| icon: 'success',
| duration: 2000
| });
| }
| });
| }
| },
| preview(e) {
| // 预览图片
| // console.log(this.result)
| if (this.allowPreview) {
| uni.previewImage({
| urls: [this.result],
| longPressActions: {
| itemList: ['保存二维码图片'],
| success: function(data) {
| // console.log('选中了第' + (data.tapIndex + 1) + '个按钮,第' + (data.index + 1) + '张图片');
| switch (data.tapIndex) {
| case 0:
| that._saveCode();
| break;
| }
| },
| fail: function(err) {
| console.log(err.errMsg);
| }
| }
| });
| }
| this.$emit('preview', {
| url: this.result
| }, e)
| },
| longpress() {
| this.$emit('longpress', this.result)
| },
| selectClick(index) {
| switch (index) {
| case 0:
| alert('保存二维码')
| this._saveCode();
| break;
| }
| },
| _result(res) {
| this.loading = false;
| this.result = res;
| this.$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;
| }
| &__content {
| position: relative;
|
| &__canvas {
| position: fixed;
| top: -99999rpx;
| left: -99999rpx;
| z-index: -99999;
| }
| }
| }
| </style>
|
|
