54 lines
1.6 KiB
JavaScript
54 lines
1.6 KiB
JavaScript
import UQRCode from 'uqrcodejs'
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/**
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* 在组件内隐藏 canvas 上绘制二维码，导出临时文件路径供 <image> 展示。
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* @param {object} opts
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* @param {string} opts.text 二维码内容（出入库单 id）
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* @param {string} opts.canvasId canvas-id
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* @param {object} opts.componentInstance 组件实例（getCurrentInstance().proxy）
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* @param {number} [opts.size=200]
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* @returns {Promise<string>} tempFilePath
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*/
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export function makeQrTempFile({ text, canvasId, componentInstance, size = 200 }) {
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const content = String(text || '').trim()
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if (!content) {
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return Promise.reject(new Error('二维码内容为空'))
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}
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if (!componentInstance) {
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return Promise.reject(new Error('缺少组件实例'))
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}
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return new Promise((resolve, reject) => {
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try {
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const qr = new UQRCode()
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qr.data = content
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qr.size = size
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qr.margin = 10
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qr.make()
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const ctx = uni.createCanvasContext(canvasId, componentInstance)
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qr.canvasContext = ctx
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qr.drawCanvas()
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// drawCanvas 内部会 ctx.draw；稍延迟再导出
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setTimeout(() => {
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uni.canvasToTempFilePath(
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{
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canvasId,
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width: size,
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height: size,
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destWidth: size,
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destHeight: size,
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success: (res) => {
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if (res.tempFilePath) resolve(res.tempFilePath)
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else reject(new Error('二维码导出失败'))
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},
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fail: (err) => reject(err || new Error('二维码导出失败'))
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},
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componentInstance
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)
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}, 120)
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} catch (e) {
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reject(e)
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}
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})
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}
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