import React, {Component} from 'react'
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import PropTypes from 'prop-types'
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import { is, fromJS } from 'immutable'
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import { Button } from 'antd'
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import html2Canvas from 'html2canvas'
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import moment from 'moment'
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import JsPDF from 'jspdf'
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import MKEmitter from '@/utils/events.js'
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import MkIcon from '@/components/mk-icon'
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// import './index.scss'
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class ExportPDF extends Component {
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static propTpyes = {
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btn: PropTypes.object
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}
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state = {
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loading: false,
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}
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componentDidMount () {
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MKEmitter.addListener('triggerBtnId', this.actionTrigger)
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}
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shouldComponentUpdate (nextProps, nextState) {
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return !is(fromJS(this.state), fromJS(nextState))
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}
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componentWillUnmount () {
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this.setState = () => {
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return
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}
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MKEmitter.removeListener('triggerBtnId', this.actionTrigger)
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}
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/**
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* @description 触发按钮操作
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*/
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actionTrigger = (triggerId) => {
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const { btn } = this.props
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const { loading } = this.state
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if (loading) return
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if (triggerId && btn.uuid !== triggerId) return
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this.setState({
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loading: true
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}, () => {
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this.getCanvas()
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})
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}
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getCanvas = () => {
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const { btn } = this.props
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let wrap = document.getElementById('menu' + btn.$MenuID)
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const opts = {
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scale: 1.5, // 缩放比例，提高生成图片清晰度
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useCORS: false, // 允许加载跨域的图片
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allowTaint: false, // 允许图片跨域，和 useCORS 二者不可共同使用
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tainttest: false, // 检测每张图片已经加载完成
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logging: false // 日志开关，发布的时候记得改成 false
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}
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// eslint-disable-next-line
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html2Canvas(wrap, opts).then(canvas => {
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// const contentWidth = parseInt(canvas.style.width) * 2
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// const contentHeight = parseInt(canvas.style.height) * 2
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const contentWidth = canvas.width
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const contentHeight = canvas.height
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const pageHeight = (contentWidth / 592.28) * 841.89
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let leftHeight = contentHeight
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const imgWidth = 595.28
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const imgHeight = (592.28 / contentWidth) * contentHeight
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const pageData = canvas.toDataURL('image/jpeg', 1.0)
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let position = 0
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let title = btn.logLabel + moment().format('YYYYMMDDHHmmss')
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const PDF = new JsPDF('', 'pt', 'a4')
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if (leftHeight < pageHeight) {
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PDF.addImage(pageData, 'JPEG', 10, 0, imgWidth - 20, imgHeight)
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} else {
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while (leftHeight > 0) {
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PDF.addImage(pageData, 'JPEG', 10, position, imgWidth - 20, imgHeight)
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leftHeight -= pageHeight
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position -= 841.89
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if (leftHeight > 0) {
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PDF.addPage()
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}
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}
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}
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PDF.save(title + '.pdf')
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this.setState({
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loading: false
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})
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})
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}
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render() {
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const { btn } = this.props
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const { loading } = this.state
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let style = {...btn.style}
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if (loading) {
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style.opacity = 0
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}
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let label = ''
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if (btn.show === 'link') {
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label = <span>{btn.label}{btn.icon ? <MkIcon style={{marginLeft: '8px'}} type={btn.icon} /> : ''}</span>
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} else if (btn.show === 'icon') {
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label = <MkIcon type={btn.icon} />
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} else {
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label = <span>{btn.icon ? <MkIcon style={{marginRight: '8px'}} type={btn.icon} /> : ''}{btn.label}</span>
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}
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return (
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<Button
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type="link"
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title={btn.show === 'icon' ? btn.label : ''}
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style={style}
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className={btn.hover || ''}
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onClick={(e) => {e.stopPropagation(); this.actionTrigger()}}
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>{label}</Button>
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)
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}
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}
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export default ExportPDF
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