pdf的展示 翻页 及数据回显
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@ -1,97 +1,213 @@
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<template>
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<div class="canvasitem">
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<canvas v-for="(item,index) in pdfObj.numberOfPdf" :key="index" :id="'pdf-canvas'+(index+1)" :ref="'canvasPdf'+(index+1)" class="pdf-canvas" style="height:100vh;padding-right:10px"></canvas>
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<div class="pdfAdnFabric">
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<canvas id="pdf-fabric"></canvas>
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<canvas id="pdf-fabric1" v-if="props.pdfObj.numberOfPdf == 2"></canvas>
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</div>
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</div>
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</template>
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<script setup >
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import { ref, onMounted, watch, reactive,defineProps ,defineExpose,nextTick,defineEmits } from 'vue';
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import {
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ref,
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onMounted,
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watch,
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reactive,
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defineProps,
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defineExpose,
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nextTick,
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defineEmits
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} from 'vue'
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import { fabric } from 'fabric'
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import { ElMessage } from 'element-plus'
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import { handleevent, savecanvsStore, initcanvasdata, displayData } from '@/utils/pdfAndFabric'
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const props = defineProps({
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pdfObj: {
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type: Object,
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default: {
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numberOfPdf:2, //pdf数量 只有 1 2
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pdfUrl:null,
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numPages:1
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numberOfPdf: 2, //pdf数量 只有 1 2
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pdfUrl: null,
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numPages: 1
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}
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}
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})
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const numPages=ref(0)
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// canvas的所有数据
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const canvsStore = reactive({
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id: 'xxxx',
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pageArr: []
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})
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const fabriccanvas = ref(null)
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const fabriccanvas1 = ref(null)
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// 页面总数
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const numPagesTotal = ref(0)
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const imgarr = ref([])
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// 多个pdf的对象
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const canvasNumbsValue = ref([]);
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const emit = defineEmits(['update:numPages'])
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const canvasNumbsValue = ref([])
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const emit = defineEmits(['update:numPagesTotal'])
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const renderPage = async (canvasobj) => {
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if(canvasobj.page>numPages.value) return
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const pdf = await pdfjsLib.getDocument(props.pdfObj.pdfUrl).promise;
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if (canvasobj.page > numPagesTotal.value) return
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const pdf = await pdfjsLib.getDocument(props.pdfObj.pdfUrl).promise
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// 渲染当前页
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const page1 = await pdf.getPage(canvasobj.page);
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const viewport1 = page1.getViewport({ scale: 1 });
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const canvasElement1 = canvasobj.canvas;
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canvasElement1.width = viewport1.width;
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canvasElement1.height = viewport1.height;
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const page = await pdf.getPage(canvasobj.page)
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const viewport = page.getViewport({ scale: 1 })
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const renderContext1 = {
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canvasContext:canvasobj.context,
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viewport: viewport1,
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};
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await page1.render(renderContext1).promise;
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};
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const canvasElement = canvasobj.canvas
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canvasElement.width = viewport.width
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canvasElement.height = viewport.height
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const renderContext = {
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canvasContext: canvasobj.context,
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viewport: viewport
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}
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page.render(renderContext).promise.then((res) => {
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const img = document.createElement('img')
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img.src = canvasobj.canvas.toDataURL('image/png')
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canvasobj.canvas.remove()
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imgarr.value.push({ src: img.src, page: canvasobj.page, JSONdata: {}, index: canvasobj.index })
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img.onload = () => {
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// 在这里执行图像加载完成后的操作
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// 根据传过来的pdf对象 判断改渲染哪一个fabric
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if (props.pdfObj.numberOfPdf == 2) {
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if (canvasobj.index == 0) {
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fabriccanvas.value.setWidth(img.width)
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fabriccanvas.value.setHeight(img.height)
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displayData(fabriccanvas, canvsStore, canvasobj, fabric, img)
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} else {
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fabriccanvas1.value.setWidth(img.width)
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fabriccanvas1.value.setHeight(img.height)
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displayData(fabriccanvas1, canvsStore, canvasobj, fabric, img)
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}
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} else {
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fabriccanvas.value.setWidth(img.width)
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fabriccanvas.value.setHeight(img.height)
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displayData(fabriccanvas, canvsStore, canvasobj, fabric, img)
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}
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// console.log(imgarr.value)
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img.remove()
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}
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// 判断imgarr的JSONdata在canvsStore.pageArr有没有
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canvsStore.pageArr.forEach((item) => {
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if (item.page == canvasobj.page) {
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imgarr.value.forEach((img) => {
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if (img.page == canvasobj.page) {
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img.JSONdata = item.JSONdata
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}
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})
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}
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})
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})
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}
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const updatePage = (canvasobj) => {
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renderPage(canvasobj);
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};
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renderPage(canvasobj)
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}
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const loadPdf = async (canvasobj) => {
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updatePage(canvasobj)
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}
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updatePage(canvasobj);
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};
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const initPdf = async() => {
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const initPdf = async (type = 'default') => {
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// 保存数据
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savecanvsStore(imgarr, canvsStore)
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// initcanvasdata(fabriccanvas)
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// initcanvasdata(fabriccanvas1)
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// 单页模式
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if (type == 'restone') {
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// 清除 canvas 上的所有对象
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fabriccanvas1.value.clear()
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// 释放 canvas 的资源
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fabriccanvas1.value.dispose()
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}
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// 清除现有 canvas 元素的内容
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canvasNumbsValue.value.forEach((canvasObj) => {
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const context = canvasObj.context;
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context.clearRect(0, 0, canvasObj.canvas.width, canvasObj.canvas.height);
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});
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canvasNumbsValue.value=[]
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if(props.pdfObj.pdfUrl){
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await nextTick(); // 确保 DOM 渲染完成
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if(props.pdfObj.numberOfPdf==1){
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canvasNumbsValue.value=[{}]
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canvasNumbsValue.value[0].canvas = document.getElementById('pdf-canvas1');
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canvasNumbsValue.value[0].context = canvasNumbsValue.value[0].canvas.getContext('2d');
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canvasNumbsValue.value[0].page =Number(props.pdfObj.numPages)*props.pdfObj.numberOfPdf
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await loadPdf(canvasNumbsValue.value[0]);
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}else{
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for(var i=0;i<props.pdfObj.numberOfPdf;i++){
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canvasNumbsValue.value[i] = {};
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canvasNumbsValue.value[i].canvas = document.getElementById('pdf-canvas'+(i+1));
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canvasNumbsValue.value[i].context = canvasNumbsValue.value[i].canvas.getContext('2d');
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if(i==0){
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canvasNumbsValue.value[i].page =Number(props.pdfObj.numPages)*props.pdfObj.numberOfPdf-1
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}else{
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canvasNumbsValue.value[i].page =Number(props.pdfObj.numPages)*props.pdfObj.numberOfPdf
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}
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await loadPdf(canvasNumbsValue.value[i]);
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}
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const context = canvasObj.context
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context.clearRect(0, 0, canvasObj.canvas.width, canvasObj.canvas.height)
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})
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// 清除所有对象
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imgarr.value = []
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canvasNumbsValue.value = []
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if (props.pdfObj.pdfUrl) {
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await nextTick() // 确保 DOM 渲染完成
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if (props.pdfObj.numberOfPdf == 1) {
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canvasNumbsValue.value = [{}]
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const canvasElement = document.createElement('canvas')
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canvasNumbsValue.value[0].canvas = canvasElement
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canvasNumbsValue.value[0].context = canvasNumbsValue.value[0].canvas.getContext('2d')
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canvasNumbsValue.value[0].page = props.pdfObj.numPages
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canvasNumbsValue.value[0].index = 0
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await loadPdf(canvasNumbsValue.value[0])
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} else {
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for (var i = 0; i < props.pdfObj.numberOfPdf; i++) {
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canvasNumbsValue.value[i] = {}
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const canvasElement = document.createElement('canvas')
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canvasNumbsValue.value[i].canvas = canvasElement
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canvasNumbsValue.value[i].context = canvasNumbsValue.value[i].canvas.getContext('2d')
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// 设置页数
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if (i == 0) {
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canvasNumbsValue.value[i].page = props.pdfObj.numPages
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} else {
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canvasNumbsValue.value[i].page = props.pdfObj.numPages + 1
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}
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canvasNumbsValue.value[i].index = i
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// 加载FabricVue
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await loadPdf(canvasNumbsValue.value[i])
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}
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}
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}
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}
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onMounted( async() => {
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const pdf = await pdfjsLib.getDocument(props.pdfObj.pdfUrl).promise;
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numPages.value = pdf.numPages;
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emit('update:numPages', pdf.numPages);
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const initPdfone = async () => {
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setTimeout(() => {
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fabriccanvas1.value = new fabric.Canvas('pdf-fabric1')
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fabriccanvas1.value.isDrawingMode = true
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fabriccanvas1.value.freeDrawingBrush.color = 'red'
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fabriccanvas1.value.setWidth(595)
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}, 0)
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initPdf('addOnePage')
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}
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onMounted(async () => {
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try {
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const pdf = await pdfjsLib.getDocument(props.pdfObj.pdfUrl).promise
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numPagesTotal.value = pdf.numPages
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// console.log(pdf)
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// 初始化fabriccanvas
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fabriccanvas.value = new fabric.Canvas('pdf-fabric')
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fabriccanvas.value.setWidth(595)
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fabriccanvas.value.isDrawingMode = true
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fabriccanvas.value.freeDrawingBrush.color = 'red'
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fabriccanvas1.value = new fabric.Canvas('pdf-fabric1')
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fabriccanvas1.value.isDrawingMode = true
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fabriccanvas1.value.freeDrawingBrush.color = 'red'
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fabriccanvas1.value.setWidth(595)
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emit('update:numPagesTotal', pdf.numPages)
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initPdf()
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});
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} catch (error) {
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console.log(error)
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ElMessage.error('pdf文件错误')
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}
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// 监听2个canvas事件
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handleevent(fabriccanvas.value, imgarr)
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handleevent(fabriccanvas1.value, imgarr, 'two')
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})
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defineExpose({
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initPdf
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});
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initPdf,
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initPdfone
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})
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</script>
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<style lang="scss" scoped>
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.canvasitem{
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.canvasitem {
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display: flex;
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flex-wrap: wrap;
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width: 100%;
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justify-content: center
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justify-content: center;
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}
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.pdfAdnFabric {
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position: relative;
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display: flex;
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height: 100vh;
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align-items: center;
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:deep(> div:nth-of-type(1)) {
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margin-right: 10px;
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}
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}
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</style>
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@ -28,6 +28,8 @@ export class CanvasClickEvent {
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// 事件：按下鼠标
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canvas?.on('mouse:down', (e) => {
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console.log(222222222222222222222222222)
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this.isMouseDown = true
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if (this.isSpaceKeyDown) {
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return
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@ -148,6 +150,8 @@ export class CanvasClickEvent {
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// 事件：移动鼠标
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canvas?.on('mouse:move', (e) => {
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console.log(222222222222222222222222222)
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if (this.isMouseDown) {
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// Press space, drag the canvas, stop drawing.
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if (this.isSpaceKeyDown) {
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@ -180,6 +184,8 @@ export class CanvasClickEvent {
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// 事件：松开鼠标
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canvas?.on('mouse:up', (e) => {
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console.log(222222222222222222222222222)
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this.isMouseDown = false
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if (this.autoDrawInk?.[0]?.length > 3) {
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autoDrawData.addInk([...this.autoDrawInk])
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@ -0,0 +1,129 @@
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// 所有事件
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export function handleevent(canvas, imgarr, type = 'defalut') {
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// 鼠标按下
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canvas.on('mouse:down', function (e) {})
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// // 监听鼠标移动事件
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// canvas.on('mouse:move', (options) => {
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// console.log('Mouse move event:', options);
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// });
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// 监听鼠标释放事件
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canvas.on('mouse:up', (options) => {
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//判断是点击的哪一个
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if (type == 'defalut') {
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if (imgarr.value[0].index == 0) {
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imgarr.value[0].JSONdata = canvas.toJSON()
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}
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if (imgarr.value[1].index == 0) {
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imgarr.value[1].JSONdata = canvas.toJSON()
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}
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} else {
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if (imgarr.value[0].index == 1) {
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imgarr.value[0].JSONdata = canvas.toJSON()
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}
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if (imgarr.value[1].index == 1) {
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imgarr.value[1].JSONdata = canvas.toJSON()
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}
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}
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})
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}
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// 保存数据
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export function savecanvsStore(imgarr, canvsStore) {
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canvsStore.pageArr = mergeAndReplace(canvsStore.pageArr, imgarr.value)
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// console.log(canvsStore.pageArr,22222222222222222222+'存入')
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}
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// 重显数据
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export function displayData(canvas, canvsStore, canvasobj, fabric, img) {
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// 初始化
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if (!canvsStore.pageArr.length) {
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fabric.Image.fromURL(img.src, (img) => {
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img.set({
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left: 0,
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top: 0,
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scaleX: canvas.value.width / img.width,
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scaleY: canvas.value.height / img.height
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})
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canvas.value.setBackgroundImage(img, canvas.value.renderAll.bind(canvas.value))
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})
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return
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}
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canvsStore.pageArr.forEach((item) => {
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//初始化
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if (item.page == canvasobj.page) {
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canvas.value.clear() // 清除 Canvas
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// console.log(item.JSONdata, '找到一样的数据')
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canvas.value.loadFromJSON(item.JSONdata, () => {
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// 在所有对象加载完成后重新渲染画布
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requestAnimationFrame(() => {
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// 渲染所有对象
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canvas.value.renderAll.bind(canvas.value)
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canvas.value.renderAll()
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})
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})
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} else {
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// 使用 requestAnimationFrame 来更新画布，确保在下一帧进行重绘
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canvas.value.clear() // 清除 Canvas
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requestAnimationFrame(function () {
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fabric.Image.fromURL(img.src, (img) => {
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img.set({
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left: 0,
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top: 0,
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scaleX: canvas.value.width / img.width,
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scaleY: canvas.value.height / img.height
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})
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canvas.value.setBackgroundImage(img, canvas.value.renderAll.bind(canvas.value))
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})
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// 渲染所有对象
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canvas.value.renderAll.bind(canvas.value)
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})
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}
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})
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}
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//page 一样替换
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const mergeAndReplace = (arr1, arr2) => {
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// // 用于存储替换后的数组
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// const resultArray = array1.map(item1 => {
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// // 在 array2 中查找 page 相同的对象
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// const replacement = array2.find(item2 => item2.page == item1.page);
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// // 如果找到替换对象，则返回替换对象，否则返回原对象
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// return replacement ? replacement : item1;
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// });
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// // 将 array2 中 page 不在 array1 中的对象追加到结果数组中
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// array2.forEach(item2 => {
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// const existsInArray1 = array1.some(item1 => item1.page == item2.page);
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// if (!existsInArray1) {
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// resultArray.push(item2);
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// }
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// });
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// return resultArray;
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// 创建一个映射，将 arr2 中的对象按 page 属性存储
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let map = new Map(arr2.map((item) => [item.page, item]))
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// 使用 map 替换 arr1 中相应 page 的对象，并添加 arr2 中的对象
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arr1 = arr1.map((item) => (map.has(item.page) ? map.get(item.page) : item))
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// 将 map 中存在但 arr1 中不存在的对象添加到 arr1
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for (let [page, obj] of map) {
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if (!arr1.some((item) => item.page === page)) {
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arr1.push(obj)
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}
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}
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return arr1
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}
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// 初始化数据
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export function initcanvasdata(canvas) {
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canvas.value.clear() // 清除 Canvas
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// 设置画布的背景色或其他属性
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canvas.value.backgroundColor = 'rgba(255, 255, 255, 1)' // 白色背景
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// 使用 requestAnimationFrame 来更新画布，确保在下一帧进行重绘
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requestAnimationFrame(function () {
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// 渲染所有对象
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canvas.value.renderAll.bind(canvas.value)
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})
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}
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@ -1,17 +1,28 @@
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<template>
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<div class="pdfbox" ref="pdfbox">
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<pdfCanvas :pdfObj="pdfObj" ref="pdfCanvaslist" @update:numPages="handleUpdate" />
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<pdfCanvas :pdfObj="pdfObj" ref="pdfCanvaslist" @update:numPagesTotal="handleUpdate" />
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<div class="pdf-btn">
|
||||
<el-button style=" border-top-left-radius: 8px;" @click="switchPageMode">
|
||||
<i class="iconfont icon-danyemoban" v-if="pdfObj.numberOfPdf==2"></i>
|
||||
<i class="iconfont icon-shuangye" v-if="pdfObj.numberOfPdf==1"></i>
|
||||
<span class="texts">{{ pdfObj.numberOfPdf==1?'双页':'单页' }}</span>
|
||||
<el-button
|
||||
style="border-top-left-radius: 8px"
|
||||
@click="switchPageMode"
|
||||
:disabled="numPagesTotal == 1"
|
||||
>
|
||||
<i class="iconfont icon-danyemoban" v-if="pdfObj.numberOfPdf == 2"></i>
|
||||
<i class="iconfont icon-shuangye" v-if="pdfObj.numberOfPdf == 1"></i>
|
||||
<span class="texts">{{ pdfObj.numberOfPdf == 1 ? '双页' : '单页' }}</span>
|
||||
</el-button>
|
||||
<el-button @click="navtopage('up')" :disabled="pdfObj.numPages==1">
|
||||
<el-button @click="navtopage('up')" :disabled="pdfObj.numPages == 1 || numPagesTotal == 1">
|
||||
<i class="iconfont icon-shangyiye"></i>
|
||||
<span class="texts">上一页</span>
|
||||
</el-button>
|
||||
<el-button @click="navtopage('lower')" :disabled="pdfObj.numPages >= numPages/pdfObj.numberOfPdf" >
|
||||
<el-button
|
||||
@click="navtopage('lower')"
|
||||
:disabled="
|
||||
pdfObj.numberOfPdf == 1
|
||||
? pdfObj.numPages >= numPagesTotal
|
||||
: pdfObj.numPages >= numPagesTotal - 1 || numPagesTotal == 1
|
||||
"
|
||||
>
|
||||
<i class="iconfont icon-xiayiye"></i>
|
||||
<span class="texts">下一页</span>
|
||||
</el-button>
|
||||
|
|
@ -20,59 +31,59 @@
|
|||
</template>
|
||||
|
||||
<script setup>
|
||||
import { ref, onMounted, watch, reactive } from 'vue';
|
||||
import * as pdfjsLib from 'pdfjs-dist/legacy/build/pdf';
|
||||
pdfjsLib.GlobalWorkerOptions.workerSrc = '/lib/build/pdf.worker.mjs';
|
||||
import pdfCanvas from '@/components/pdf/index.vue';
|
||||
import { ref, onMounted, watch, reactive } from 'vue'
|
||||
import * as pdfjsLib from 'pdfjs-dist/legacy/build/pdf'
|
||||
pdfjsLib.GlobalWorkerOptions.workerSrc = '/lib/build/pdf.worker.mjs'
|
||||
import pdfCanvas from '@/components/pdf/index.vue'
|
||||
|
||||
// 传过去的参数
|
||||
const pdfObj = reactive({
|
||||
numberOfPdf:2, //显示几页
|
||||
pdfUrl:'/aaa.pdf', //url
|
||||
numPages:1//当前页数
|
||||
});
|
||||
const numPages=ref(0)
|
||||
|
||||
const pdfCanvaslist=ref(null);
|
||||
const navtopage=(type)=>{
|
||||
const maxpage=numPages.value/pdfObj.numberOfPdf
|
||||
if(type=='up'){
|
||||
pdfObj.numPages--;
|
||||
}else{
|
||||
pdfObj.numPages++;
|
||||
numberOfPdf: 2, //显示几页
|
||||
pdfUrl: '/aaa.pdf', //url
|
||||
numPages: 1 //当前页数
|
||||
})
|
||||
// 总条数
|
||||
const numPagesTotal = ref(0)
|
||||
const pdfCanvaslist = ref(null)
|
||||
const navtopage = (type) => {
|
||||
let num = 1
|
||||
if (pdfObj.numberOfPdf == 2) {
|
||||
num = 2
|
||||
}
|
||||
if(pdfObj.numPages>maxpage) return
|
||||
if (type == 'up') {
|
||||
pdfObj.numPages -= num
|
||||
} else {
|
||||
pdfObj.numPages += num
|
||||
}
|
||||
if (pdfObj.numPages > numPagesTotal.value) return
|
||||
pdfCanvaslist.value.initPdf()
|
||||
}
|
||||
|
||||
const handleUpdate=(data)=>{
|
||||
numPages.value=data
|
||||
}
|
||||
const divideWithRemainder=(num1, num2)=> {
|
||||
// 执行除法运算
|
||||
const quotient = Math.floor(num1 / num2);
|
||||
const remainder = num1 % num2;
|
||||
|
||||
// 如果有余数，则结果加 1
|
||||
return remainder === 0 ? quotient : quotient + 1;
|
||||
const handleUpdate = (data) => {
|
||||
numPagesTotal.value = data
|
||||
if (numPagesTotal.value == 1) {
|
||||
pdfObj.numberOfPdf = 1
|
||||
pdfCanvaslist.value.initPdf('restone')
|
||||
}
|
||||
}
|
||||
// 单双页切换
|
||||
const switchPageMode=()=>{
|
||||
const switchPageMode = () => {
|
||||
// 单页切多页
|
||||
if(pdfObj.numberOfPdf==1){
|
||||
pdfObj.numberOfPdf=2;
|
||||
pdfObj.numPages= divideWithRemainder(pdfObj.numPages,pdfObj.numberOfPdf)
|
||||
}else{
|
||||
// 多页切单页
|
||||
pdfObj.numberOfPdf=1;
|
||||
pdfObj.numPages=pdfObj.numPages*2-1
|
||||
if (pdfObj.numberOfPdf == 1) {
|
||||
// 如果最后一页 切双页需要减1
|
||||
if (pdfObj.numPages == numPagesTotal.value) {
|
||||
pdfObj.numPages = pdfObj.numPages - 1
|
||||
}
|
||||
pdfObj.numberOfPdf = 2
|
||||
// 初始化第二个pdf canvas
|
||||
pdfCanvaslist.value.initPdfone()
|
||||
} else {
|
||||
// 多页切单页
|
||||
pdfObj.numberOfPdf = 1
|
||||
pdfCanvaslist.value.initPdf('restone')
|
||||
}
|
||||
|
||||
pdfCanvaslist.value.initPdf()
|
||||
}
|
||||
onMounted(async () => {
|
||||
|
||||
});
|
||||
|
||||
onMounted(async () => {})
|
||||
</script>
|
||||
|
||||
<style lang="scss" scoped>
|
||||
|
|
@ -82,17 +93,17 @@ onMounted(async () => {
|
|||
justify-content: center;
|
||||
background: #f0f0f0;
|
||||
flex-wrap: wrap;
|
||||
.pdf-btn{
|
||||
.pdf-btn {
|
||||
position: absolute;
|
||||
right: 0;
|
||||
bottom: 0;
|
||||
box-shadow: 0 4px 6px rgba(0, 0, 0, 0.5);
|
||||
border-radius: 5px 0 0 0;
|
||||
.texts{
|
||||
.texts {
|
||||
display: block !important;
|
||||
margin-top: 10px;
|
||||
}
|
||||
button{
|
||||
button {
|
||||
margin-left: 0;
|
||||
border: none;
|
||||
font-size: 16px;
|
||||
|
|
@ -100,10 +111,10 @@ onMounted(async () => {
|
|||
border-radius: 0;
|
||||
width: 80px;
|
||||
height: 70px;
|
||||
:deep(>span) {
|
||||
:deep(> span) {
|
||||
display: block !important;
|
||||
}
|
||||
.iconfont{
|
||||
.iconfont {
|
||||
font-size: 26px;
|
||||
margin-bottom: 10px;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue