<template>
<div class="cw-block cw-block-document">
<courseware-default-block
:block="block"
:canEdit="canEdit"
:isTeacher="isTeacher"
:preview="false"
@showEdit="initCurrentData"
@storeEdit="storeBlock"
@closeEdit="initCurrentData"
>
<template #content>
<div class="cw-pdf-main-container">
<template v-if="hasFile">
<div v-if="currentTitle !== ''" class="cw-block-title">
{{ currentTitle }}
</div>
<div class="cw-pdf-toolbar">
<div class="cw-pdf-toolbar-left">
<div class="cw-pdf-toc">
<button
class="undecorated"
:class="{ active: pdfTOCDisplay }"
:title="$gettext('Inhaltsverzeichnis')"
:aria-pressed="pdfTOCDisplay ? 'true' : 'false'"
@click="toggleTOCViewer"
>
<studip-icon
shape="table-of-contents"
:role="
pdfTOC.length === 0
? 'inactive'
: pdfTOCDisplay
? 'info_alt'
: 'clickable'
"
:size="18"
class="text-bottom"
/>
</button>
</div>
<div class="cw-pdf-search-toggle-btn">
<button
class="undecorated"
:class="{ active: showPdfSearchBox }"
:title="$gettext('Suche')"
:aria-pressed="showPdfSearchBox ? 'true' : 'false'"
@click="togglePdfSearchBox"
>
<studip-icon
shape="search"
:role="showPdfSearchBox ? 'info_alt' : 'clickable'"
:size="18"
class="text-bottom"
/>
</button>
</div>
<div class="cw-pdf-search-box" v-show="showPdfSearchBox">
<input
ref="pdfSearchInput"
type="text"
v-model="pdfSearch"
@change="doSearchInPdf"
/>
<div class="cw-pdf-search-navs" v-if="pdfSearchFoundNums > 1">
<button class="undecorated" @click="prevPdfSearch" :title="$gettext('Letzte')">
<studip-icon
shape="arr_1left"
:role="pdfSearchFoundSelectedIndex === 0 ? 'inactive' : 'clickable'"
:size="18"
class="text-bottom"
/>
</button>
<button class="undecorated" @click="nextPdfSearch" :title="$gettext('Nächste')">
<studip-icon
shape="arr_1right"
:role="
pdfSearchFoundSelectedIndex === pdfSearchFoundNums - 1
? 'inactive'
: 'clickable'
"
:size="18"
class="text-bottom"
/>
</button>
</div>
<span class="cw-pdf-search-num" v-if="pdfSearchFoundNums > 0">
{{ pdfSearchFoundSelectedIndex + 1 }} / {{ pdfSearchFoundNums }}
{{ $gettext('Treffer') }}
</span>
</div>
<div class="cw-pdf-page-nav">
<button
class="undecorated"
@click="prevPage"
:title="$gettext('Eine Seite zurück')"
>
<studip-icon
shape="arr_1up"
:role="pageNum - 1 === 0 ? 'inactive' : 'clickable'"
:size="18"
class="text-bottom"
/>
</button>
<button class="undecorated" @click="nextPage" :title="$gettext('Eine Seite vor')">
<studip-icon
shape="arr_1down"
:role="pageNum === pageCount ? 'inactive' : 'clickable'"
:size="18"
class="text-bottom"
/>
</button>
<input
type="text"
ref="pageNumInput"
class="cw-pdf-page-num"
:aria-label="$gettext('Seite')"
:value="pageNum"
@change="updatePageNum"
/>
<span> {{ $gettext('von') }} {{ pageCount }} </span>
</div>
</div>
<div class="cw-pdf-toolbar-middle">
<div class="cw-pdf-zoom-buttons">
<button class="undecorated" @click="zoomIn" :title="$gettext('Vergrößern')">
<studip-icon shape="add" :size="18" class="text-bottom" />
</button>
<button class="undecorated" @click="zoomOut" :title="$gettext('Verkleinern')">
<studip-icon shape="remove" :size="18" class="text-bottom" />
</button>
<select v-model="currentScale" :aria-label="$gettext('Zoom')" @change="updateZoom">
<option v-show="false" :value="currentScale">{{ formattedZoom }}%</option>
<option v-for="(value, index) in scaleValues" :key="index" :value="value.scale">
{{ value.name }}
</option>
</select>
</div>
<div class="cw-pdf-rotate">
<button class="undecorated" @click="doRotatePdf" :title="$gettext('Drehen')">
<studip-icon shape="rotate-right" :size="18" class="text-bottom" />
</button>
</div>
</div>
<div class="cw-pdf-toolbar-right">
<div class="cw-pdf-handtool">
<button
class="undecorated"
:class="{ active: pdfHandTool }"
:title="$gettext('Hand-Werkzeug')"
:aria-pressed="pdfHandTool ? 'true' : 'false'"
@click="toggleHandTool"
>
<studip-icon
shape="hand"
:role="pdfHandTool ? 'info_alt' : 'clickable'"
:size="18"
class="text-bottom"
/>
</button>
</div>
<div class="cw-pdf-download">
<a
v-if="downloadable === 'true'"
:href="currentUrl"
download
:title="$gettext('Speichern')"
>
<studip-icon shape="download" :size="18" class="text-bottom" />
</a>
</div>
</div>
</div>
<div class="cw-pdf-outer-container" ref="outerContainer">
<div class="cw-pdf-content">
<span class="sr-only" aria-live="polite">{{ srMessage }}</span>
<div class="cw-pdf-sidebar" v-show="pdfTOCDisplay">
<ul class="cw-pdf-toc-list">
<CoursewarePDFTableOfContent
v-for="(item, index) in pdfTOC"
:item="item"
:key="index"
@tocPageNav="tocPageNav"
/>
</ul>
</div>
<div
ref="container"
class="cw-pdf-viewer-container"
:class="{
'hand-cursor-grab': pdfHandTool,
grabbing: pdfGrabbing,
'has-error': pdfError,
}"
v-dragscroll="pdfHandTool"
@mousedown="handleMouseDown"
@mouseup="handleMouseUp"
>
<div class="pdfViewer" />
</div>
</div>
<div v-show="pdfError" class="cw-pdf-error-page">
<courseware-companion-box
mood="sad"
:msgCompanion="$gettext('Es gab einen Fehler. Bitte versuchen Sie es erneut!')"
>
</courseware-companion-box>
</div>
<div ref="fakeContainer" class="cw-pdf-viewer-fake-container">
<div class="pdfViewer" />
</div>
</div>
</template>
</div>
</template>
<template v-if="canEdit" #edit>
<form class="default" @submit.prevent="">
<label>
{{ $gettext('Überschrift') }}
<input type="text" v-model="currentTitle" />
</label>
<label>
{{ $gettext('Datei') }}
<studip-file-chooser
v-model="currentFileId"
selectable="file"
:courseId="context.id"
:userId="userId"
:isDocument="true"
:excludedCourseFolderTypes="excludedCourseFolderTypes"
/>
</label>
<label>
{{ $gettext('Download-Icon anzeigen') }}
<select v-model="currentDownloadable">
<option value="true">{{ $gettext('Ja') }}</option>
<option value="false">{{ $gettext('Nein') }}</option>
</select>
</label>
<label>
{{ $gettext('Dateityp') }}
<select v-model="currentDocType">
<option value="pdf">PDF</option>
</select>
</label>
</form>
</template>
<template #info>
<p>{{ $gettext('Informationen zum Dokument-Block') }}</p>
</template>
</courseware-default-block>
</div>
</template>
<script>
import BlockComponents from './block-components.js';
import blockMixin from '@/vue/mixins/courseware/block.js';
import CoursewarePDFTableOfContent from './CoursewarePDFTableOfContent.vue';
import { getDocument } from 'pdfjs-dist';
import {
DefaultAnnotationLayerFactory,
DefaultTextLayerFactory,
DefaultXfaLayerFactory,
DefaultStructTreeLayerFactory,
PDFFindController,
PDFLinkService,
PDFPageView,
PDFViewer,
EventBus,
} from 'pdfjs-dist/web/pdf_viewer.js';
// pdfjsWorker must be imported!
import pdfjsWorker from 'pdfjs-dist/build/pdf.worker.entry';
import { dragscroll } from 'vue-dragscroll';
import { mapActions, mapGetters } from 'vuex';
import 'pdfjs-dist/web/pdf_viewer.css';
export default {
name: 'courseware-document-block',
mixins: [blockMixin],
components: Object.assign(BlockComponents, { CoursewarePDFTableOfContent }),
directives: {
dragscroll,
},
props: {
block: Object,
canEdit: Boolean,
isTeacher: Boolean,
},
data() {
return {
currentTitle: '',
currentFileId: '',
currentFile: {},
currentDownloadable: '',
currentDocType: '',
pdfError: false,
pdfBasePage: null,
pdfPage: null,
pdfTextContent: null,
pdfHandTool: false,
pdfGrabbing: false,
pdfTextLayer: null,
pdfAnnotationLayer: null,
pdfAnnotation: false,
pdfRotate: 0,
pdfViewer: null,
pdfEventBus: null,
pdfLinkService: null,
pdfFindController: null,
pdfDoc: null,
pdfLoadingTask: null,
pdfSearch: '',
pdfSearchMatchesMapping: [],
pdfSearchFoundNums: 0,
pdfSearchFoundSelectedIndex: 0,
pdfSearchHighlightedList: [],
showPdfSearchBox: false,
pdfTOC: [],
pdfTOCDisplay: false,
pageNum: 1,
pageCount: 0,
scale: 1,
baseScale: 1,
currentScale: 1,
file: null,
srMessage: '',
};
},
computed: {
...mapGetters({
fileRefById: 'file-refs/byId',
}),
title() {
return this.block?.attributes?.payload?.title;
},
fileDownloadable() {
return this.currentDownloadable === 'true';
},
downloadable() {
return this.block?.attributes?.payload?.downloadable ?? 'true';
},
fileId() {
return this.block?.attributes?.payload?.file_id;
},
docType() {
return this.block?.attributes?.payload?.doc_type;
},
currentUrl() {
if (this.currentFile?.meta) {
return this.currentFile.meta['download-url'];
} else {
return '';
}
},
hasFile() {
return this.currentFileId !== '';
},
formattedZoom() {
return Number.parseInt(this.scale * 100, 10);
},
scaleValues() {
const defaultValues = [
{ name: '25%', scale: 0.25 },
{ name: '50%', scale: 0.5 },
{ name: '75%', scale: 0.75 },
{ name: '100%', scale: 1.0 },
{ name: '150%', scale: 1.5 },
{ name: '200%', scale: 2.0 },
{ name: '300%', scale: 3.0 },
];
return defaultValues.concat([{ name: this.$gettext('volle Breite'), scale: this.baseScale }]);
},
},
watch: {
scale(newValue) {
let overflow = newValue > this.baseScale ? 'auto' : 'hidden';
let container = this.$refs.container;
container.style.overflow = overflow;
this.currentScale = newValue;
},
pageNum(newValue) {
this.resetPdfViewer();
},
showPdfSearchBox() {
this.resetPdfSearch();
},
currentFileId(newId) {
if (newId) {
this.currentFile = this.fileRefById({ id: newId });
}
}
},
mounted() {
if (this.block.id) {
this.loadFileRefs(this.block.id).then((response) => {
this.file = response[0];
this.currentFile = this.file;
this.initPdfTask();
});
}
this.initCurrentData();
},
methods: {
...mapActions({
updateBlock: 'updateBlockInContainer',
loadFileRefs: 'loadFileRefs',
companionWarning: 'companionWarning',
}),
initCurrentData() {
this.currentTitle = this.title;
this.currentDownloadable = this.downloadable;
this.currentFileId = this.fileId;
this.currentDocType = this.docType;
},
initPdfTask() {
if (this.currentUrl) {
let view = this;
view.pdfEventBus = new EventBus();
view.pdfLoadingTask = getDocument(this.currentUrl).promise;
view.pdfLoadingTask.__PDFDocumentLoadingTask = true;
// Link Service
view.pdfLinkService = new PDFLinkService({
eventBus: view.pdfEventBus,
});
// Find Controller
view.pdfFindController = new PDFFindController({
eventBus: view.pdfEventBus,
linkService: view.pdfLinkService,
});
// Annotation Layer
view.pdfAnnotationLayer = new DefaultAnnotationLayerFactory();
// Text Layer
view.pdfTextLayer = new DefaultTextLayerFactory();
// Load Pdf Document
view.loadPdfDocument();
// Handle search results.
view.pdfEventBus.on('updatetextlayermatches', ({ source, pageIndex }) => {
if (view.pdfViewer.pdfPage._pageIndex == pageIndex) {
setTimeout(() => {
view.handleSearchMatches();
}, 260);
}
});
}
},
loadPdfDocument() {
if (this.pdfLoadingTask) {
let view = this;
view.pdfLoadingTask.then((pdfDocument) => {
view.pdfDoc = pdfDocument;
view.pageCount = pdfDocument.numPages;
// get table of contents if any.
view.loadPdfTOC();
// Rendering PDF viewer
view.loadPdfViewer();
view.pdfLinkService.setDocument(view.pdfDoc, null);
view.pdfFindController.setDocument(view.pdfDoc);
});
}
},
loadPdfTOC() {
if (this.pdfDoc) {
let view = this;
view.pdfTOC = [];
// Get the tree outline
view.pdfDoc.getOutline().then((outline) => {
if (outline) {
view.pdfTOC = outline;
}
});
}
},
loadPdfViewer() {
if (this.pdfDoc) {
let view = this;
this.pdfError = false;
let container = this.$refs.container;
let outerContainer = this.$refs.outerContainer;
let fakeContainer = this.$refs.fakeContainer;
this.pdfDoc
.getPage(parseInt(view.pageNum))
.then((pdfPage) => {
view.pdfPage = pdfPage;
const width = outerContainer.offsetWidth;
view.baseScale = (width / pdfPage.view[2] / 1.33).toFixed(2);
view.scale = view.baseScale;
// Creating the page view with default parameters.
let defaultViewport = pdfPage.getViewport({
scale: 1.0,
});
view.pdfBasePage = new PDFViewer({
container: fakeContainer,
eventBus: view.pdfEventBus,
findController: view.pdfFindController,
});
let pdfPageViewOptions = {
container: container,
id: view.pageNum,
scale: view.scale,
defaultViewport: defaultViewport,
eventBus: view.pdfEventBus,
findController: view.pdfFindController,
textHighlighterFactory: view.pdfBasePage,
xfaLayerFactory: view.pdfDoc.isPureXfa ? new DefaultXfaLayerFactory() : null,
structTreeLayerFactory: new DefaultStructTreeLayerFactory(),
};
if (view.pdfHandTool === false) {
pdfPageViewOptions.textLayerFactory = view.pdfTextLayer;
pdfPageViewOptions.annotationLayerFactory = view.pdfAnnotationLayer;
} else {
pdfPageViewOptions.textLayerMode = 0;
pdfPageViewOptions.annotationMode = 0;
}
// Force annotation to be disabled.
if (!this.pdfAnnotation && pdfPageViewOptions?.annotationLayerFactory) {
pdfPageViewOptions.annotationLayerFactory = null;
pdfPageViewOptions.annotationMode = 0;
}
view.pdfViewer = new PDFPageView(pdfPageViewOptions);
// Associates the actual page with the view, and drawing it
view.pdfViewer.setPdfPage(view.pdfPage);
// Set LinkService viewer
view.pdfLinkService.setViewer(view.pdfViewer);
view.renderPage();
})
.catch((err) => {
console.log(err);
outerContainer.style.minHeight = '350px';
view.pdfError = true;
});
}
},
renderPage() {
if (this.pdfViewer) {
this.updatePdfViewer();
this.pdfViewer.draw();
if (!this.pdfHandTool) {
this.pdfViewer.textLayer.findController = this.pdfFindController;
}
if (this.pdfPage) {
this.pdfPage.getTextContent().then((textContent) => {
this.pdfTextContent = textContent;
});
}
if (this.pdfSearchMatchesMapping.length) {
this.pdfSearchDisplayHandler();
}
}
},
resetPdfViewer() {
this.pdfViewer.destroy();
let container = this.$refs.container;
while (!container.lastChild.classList.contains('pdfViewer')) {
container.removeChild(container.lastChild);
}
this.loadPdfViewer();
},
updatePdfViewer(resetScale = false) {
let updateArgs = {
scale: resetScale ? 1 : this.scale,
rotation: this.pdfRotate,
};
this.pdfViewer.update(updateArgs);
},
prevPage() {
if (this.pageNum <= 1) {
return;
}
this.pageNum--;
},
nextPage() {
if (this.pageNum >= this.pdfDoc.numPages) {
return;
}
this.pageNum++;
},
goToPage(page) {
const pageNum = Number.parseInt(page, 10);
if (pageNum < 1 || pageNum > this.pdfDoc.numPages) {
return;
}
this.pageNum = pageNum;
},
tocPageNav(dest) {
let view = this;
let destObj = dest.find(
(ref) =>
typeof ref === 'object' &&
ref !== null &&
Number.isInteger(ref.num) &&
ref.num >= 0 &&
Number.isInteger(ref.gen) &&
ref.gen >= 0
);
if (destObj) {
view.pdfDoc.getPageIndex(destObj).then((pageIndex) => {
view.goToPage(pageIndex + 1);
});
}
},
updatePageNum() {
let pageNumInput = this.$refs.pageNumInput;
let value = Number.parseInt(pageNumInput.value, 10);
if (Number.isInteger(value) && value > 0 && value <= Number.parseInt(this.pageCount, 10)) {
this.pageNum = value;
} else {
pageNumInput.value = this.pageNum;
}
},
doRotatePdf() {
let rotationDegs = [0, 90, 180, 270, 360];
let index = rotationDegs.indexOf(this.pdfRotate);
let nextIndex = index + 1 >= rotationDegs.length ? 0 : index + 1;
let nextDeg = rotationDegs[nextIndex];
this.pdfRotate = nextDeg;
this.renderPage();
this.updateSrMessage(this.$gettext('gedreht'));
},
zoomIn() {
this.scale = this.scale < 4 ? ((this.scale * 10 + 1) / 10).toFixed(1) : this.scale;
this.renderPage();
this.updateSrMessage(this.$gettext('vergrößert'));
},
zoomOut() {
this.scale = this.scale > 0.1 ? ((this.scale * 10 - 1) / 10).toFixed(1) : this.scale;
this.renderPage();
this.updateSrMessage(this.$gettext('verkleinert'));
},
updateZoom(e) {
const value = e.target.value;
if (this.scale === value) {
return;
}
this.scale = value;
this.renderPage();
this.updateSrMessage(this.$gettext('Zoom Stufe ausgweählt'));
},
toggleHandTool() {
this.pdfHandTool = !this.pdfHandTool;
this.resetPdfViewer();
this.showPdfSearchBox = false;
},
handleHandToolDisplay(event) {
this.pdfGrabbing = event.type === 'mousedown';
},
handleMouseDown(e) {
this.handleHandToolDisplay(e);
},
handleMouseUp(e) {
this.handleHandToolDisplay(e);
},
togglePdfSearchBox() {
this.showPdfSearchBox = this.pdfHandTool ? false : !this.showPdfSearchBox;
if (this.showPdfSearchBox) {
this.$nextTick(() => {
this.$refs.pdfSearchInput.focus();
});
}
},
handleSearchMatches() {
let view = this;
let allMatches = view.pdfFindController.pageMatches;
let totalMatches = 0;
let searchSelectIndex = 0;
let matchesPageCount = 0;
view.pdfSearchMatchesMapping = [];
for (let pageIndex = 0; pageIndex < view.pageCount; pageIndex++) {
let pageNum = pageIndex + 1;
let pageMatches = allMatches[pageIndex];
totalMatches += pageMatches.length;
if (pageMatches.length) {
matchesPageCount++;
}
for (let i in pageMatches) {
let matchIndex = parseInt(i, 10);
let mappingObj = {
selectIndex: searchSelectIndex,
matchIndex: matchIndex,
pageNum: pageNum,
};
view.pdfSearchMatchesMapping.push(mappingObj);
searchSelectIndex++;
}
}
// Find next match if there the current page has nothing.
if (
view.pdfSearchFoundSelectedIndex === 0 &&
view.pdfViewer.pdfPage._pageIndex > 0 &&
matchesPageCount > 0
) {
let nextMapped = view.pdfSearchMatchesMapping.filter(
(map) => map.pageNum >= view.pdfViewer.pdfPage._pageIndex + 1
);
if (nextMapped.length) {
view.pdfSearchFoundSelectedIndex = nextMapped[0].selectIndex;
}
}
view.pdfSearchFoundNums = totalMatches;
view.pdfSearchDisplayHandler();
},
doSearchInPdf() {
let findObj = {
type: '',
query: this.pdfSearch,
phraseSearch: true,
caseSensitive: false,
entireWord: true,
highlightAll: true,
findPrevious: false,
matchDiacritics: false,
};
this.pdfEventBus.dispatch('find', findObj);
},
prevPdfSearch() {
if (this.pdfSearchFoundSelectedIndex === 0) {
return;
}
this.pdfSearchFoundSelectedIndex--;
this.pdfSearchDisplayHandler();
},
nextPdfSearch() {
if (this.pdfSearchFoundSelectedIndex === this.pdfSearchFoundNums - 1) {
return;
}
this.pdfSearchFoundSelectedIndex++;
this.pdfSearchDisplayHandler();
},
pdfSearchDisplayHandler() {
// Go to page based on selected index.
let pageMatches = this.pdfSearchMatchesMapping.filter(
(map) => map.selectIndex === this.pdfSearchFoundSelectedIndex
);
if (pageMatches.length) {
let matchObj = pageMatches[0];
// A timeout of > 250ms is needed when page is changed!
let highlightRenderTimeout = 0;
if (matchObj.pageNum !== this.pageNum) {
this.goToPage(matchObj.pageNum);
highlightRenderTimeout = 260;
}
setTimeout(() => {
this.setPdfSearchHighlighted();
this.scrollToSearchFounds(matchObj.matchIndex);
}, highlightRenderTimeout);
}
},
scrollToSearchFounds(matchIndex) {
if (this.pdfSearchHighlightedList?.length) {
let selectedSpan = this.pdfSearchHighlightedList[matchIndex];
if (selectedSpan) {
selectedSpan.classList.add('selected');
selectedSpan.scrollIntoView({ behavior: 'smooth', block: 'center' });
}
}
},
setPdfSearchHighlighted() {
if (this.pdfViewer?.textLayer?.textDivs) {
let textDivs = this.pdfViewer.textLayer.textDivs;
let highlightedSpans = [];
for (let textSpan of textDivs) {
if (textSpan?.children) {
let children = [...textSpan.children];
for (let child of children) {
if (child.nodeName == 'SPAN' && child.classList.contains('highlight')) {
child.classList.remove('selected');
highlightedSpans.push(child);
}
}
}
}
// Sort the array based on the top of the span.
highlightedSpans.sort((current, next) => {
let currentTop = parseInt(current.parentNode.style.top, 10);
let nextTop = parseInt(next.parentNode.style.top, 10);
return currentTop > nextTop;
});
this.pdfSearchHighlightedList = highlightedSpans;
}
},
resetPdfSearch() {
this.pdfSearch = '';
this.pdfSearchFoundNums = 0;
this.pdfSearchFoundSelectedIndex = 0;
this.pdfSearchHighlightedList = [];
this.pdfSearchMatchesMapping = [];
this.doSearchInPdf();
},
toggleTOCViewer() {
if (this.pdfTOC.length) {
this.pdfTOCDisplay = !this.pdfTOCDisplay;
} else {
this.pdfTOCDisplay = false;
}
},
storeBlock() {
if (this.currentFile === undefined) {
this.companionWarning({
info: this.$gettext('Bitte wählen Sie eine Datei aus.'),
});
return false;
} else {
let attributes = {};
attributes.payload = {};
attributes.payload.title = this.currentTitle;
attributes.payload.file_id = this.currentFile.id;
attributes.payload.downloadable = this.currentDownloadable.toString();
attributes.payload.doc_type = this.currentDocType;
this.updateBlock({
attributes: attributes,
blockId: this.block.id,
containerId: this.block.relationships.container.data.id,
});
}
},
updateSrMessage(message) {
this.srMessage = '';
this.srMessage = message;
},
},
};
</script>
<style scoped lang="scss">
@import '../../../../assets/stylesheets/scss/courseware/blocks/document.scss';
</style>