164 lines
4.5 KiB
Vue
164 lines
4.5 KiB
Vue
<template>
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<tpx-bluetooth-native ref="curBlueTooth">
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<template v-slot:button>
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<u-button @click="handlePrint" type="primary">确认打印</u-button>
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</template>
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<template v-slot:content>
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<view class="pt-20 pb-10">打印内容</view>
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<view class="canvas-con">
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<canvas :canvas-id="canvasId" :style="{width:canvasWidth + 'px', height: canvasHeight + 'px'}"></canvas>
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</view>
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</template>
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</tpx-bluetooth-native>
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<tpx-dialog type="type-dialog" title="打印中" :show="percentage">
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<u-row custom-style="width: 500rpx;min-height: 150rpx;padding: 10rpx;">
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<view>
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<u-line-progress :percentage="percentage" activeColor="#B12D29" height="30"></u-line-progress>
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<view class="pt-20">正在打印, 请勿退出页面, 如果卡住了请重连打印机重试</view>
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</view>
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</u-row>
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</tpx-dialog>
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</template>
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<script>
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import { showLoading, showToast, hideLoading, canvasGetImageData, getImageInfo, promiseTimeout } from "@/common/untool"
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import * as canvasUtil from "@/common/canvasUtil"
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import tanexPrinterUniSdk from './print/tanexPrinterUniSdk'
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import * as printModule from './print/print'
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export default {
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props:{
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},
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computed: {
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},
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data () {
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return {
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canvasId: uni.$u.guid(20),
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canvasWidth: 1,
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canvasHeight: 1,
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imgData: '',
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percentage: 0, // 打印进度
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imageUrl: '',
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paperWidth: 320,
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}
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},
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mounted () {
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this.initData()
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},
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unmounted() {
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},
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methods: {
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async initData() {
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await this.renderCanvasImg(this.imageUrl);
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},
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// 打印
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handlePrint(){
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const that = this
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return new Promise(async (resolve, reject)=> {
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let { bl, deviceId } = that.checkPrintParam()
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if(!bl) {
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return reject('打印参数校验不通过')
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}
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let prtInstance = tanexPrinterUniSdk.createInstance()
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prtInstance.init(that.canvasHeight)
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prtInstance.addBitmap(0, 0, that.imgData)
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prtInstance.setPagePrint()
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let commond = prtInstance.getPrintCmd()
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console.log("打印命令组装完成,开始打印=====")
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printModule.print(deviceId, commond, true)
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// printModule.printTestSimple(deviceId)
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})
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},
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renderCanvasImg(filePath) {
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let that = this
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showLoading()
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console.log("===renderCanvasImg:filePath=====", filePath)
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return new Promise(async (resolve, reject)=> {
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try{
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// 多次渲染，createCanvasContext，必须使用新的才可以
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that.canvasId = uni.$u.guid(20)
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await promiseTimeout(500)
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let res = await getImageInfo(filePath)
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console.log("getImageInfo res====", res)
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const ctx = uni.createCanvasContext(that.canvasId, that);
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// 打印宽度须是8的整数倍，这里处理掉多余的，使得宽度合适，不然有可能乱码
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const remainder = that.paperWidth % 8;
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const w = remainder === 0 ? that.paperWidth : that.paperWidth - remainder;
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// 等比算出图片的高度
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const h = Math.floor((res.height * w) / res.width);
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that.canvasWidth = w
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that.canvasHeight = h
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// 在canvas 画一张图片
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let imgRect = canvasUtil.containImg(0, 0, w, h, res.width, res.height)
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let ctData = [imgRect.dx, imgRect.dy, imgRect.dWidth, imgRect.dHeight]
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ctx.fillStyle = 'rgba(255,255,255,1)';
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ctx.clearRect(...ctData);
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ctx.fillRect(...ctData);
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// 把原图缩放到 打印宽度的比例 绘制
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ctx.drawImage(filePath, ...ctData);
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ctx.draw(false, async() => {
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await promiseTimeout(1000)
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let imgData = await canvasGetImageData({ canvasId: that.canvasId, width: w, height: h, })
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hideLoading()
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that.imgData = imgData
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resolve()
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});
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}catch(e){
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hideLoading()
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reject(e)
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}
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})
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},
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checkPrintParam() {
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let msg = '', bl = false
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let { deviceId } = this.$refs.curBlueTooth.getConData()
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!this.imgData && (msg = '打印内容不能为空，请重试')
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if(!msg && !(deviceId)) {
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msg = '请选选择打印设备'
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}
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msg && (showToast(msg))
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return {
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deviceId,
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msg,
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bl: !msg
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}
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},
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// 给外部调用api，打印自定义图
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async callPrint({ paperWidth, imageUrl } = {}) {
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try{
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this.paperWidth = paperWidth
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if(this.imageUrl != imageUrl || !this.imgData) {
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this.imageUrl = imageUrl
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await this.renderCanvasImg(this.imageUrl);
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}
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let conSta = await this.$refs.curBlueTooth.autoConnect()
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if(conSta) {
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await this.handlePrint()
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return true
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}
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} catch(e){
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}
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}
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}
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}
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</script>
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<style scoped lang="scss">
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.canvas-con{
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width: 100%;
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overflow: auto;
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}
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/*图片隐藏到窗口外*/
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canvas {
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// position: absolute;
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// z-index: -999;
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// top: -999px;
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}
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</style> |