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332 lines
9.1 KiB
HTML
332 lines
9.1 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<style>
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body {
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overflow: hidden;
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}
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#content {
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/* Needs this in case the content contains elements with absolute positioning */
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/* Without this they would just stay at a fixed position when scrolling */
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position: relative;
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overflow-y: auto;
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height: 100%;
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padding-left: 10px;
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padding-right: 10px;
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}
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mark {
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background: #F3B717;
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color: black;
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}
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.mark-selected {
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background: #CF3F00;
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color: white;
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}
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ul ul, ul ol, ol ul, ol ol {
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margin-bottom: 0px;
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}
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</style>
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</head>
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<body id="body">
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<div id="styleContainer"></div>
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<div id="markScriptContainer"></div>
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<div id="content" ondragstart="return false;" ondrop="return false;"></div>
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<script src="./lib.js"></script>
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<script>
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const ipcProxySendToHost = (methodName, arg) => {
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window.postMessage({ target: 'main', name: methodName, args: [ arg ] }, '*');
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}
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try {
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const contentElement = document.getElementById('content');
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const ipc = {};
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window.addEventListener('message', webviewLib.logEnabledEventHandler(event => {
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// Here we only deal with messages that are sent from the main Electro process to the webview.
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if (!event.data || event.data.target !== 'webview') return;
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const callName = event.data.name;
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const callData = event.data.data;
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if (!ipc[callName]) {
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console.warn('Missing IPC function:', event.data);
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} else {
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ipc[callName](callData);
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}
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}));
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const loadedCssFiles_ = {};
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function loadCssFiles(cssFiles) {
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for (let i = 0; i < cssFiles.length; i++) {
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const f = cssFiles[i];
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if (loadedCssFiles_[f]) continue;
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const link = document.createElement('link');
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link.rel = 'stylesheet';
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link.href = f;
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document.getElementById('styleContainer').appendChild(link);
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}
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}
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// Note: the scroll position source of truth is "percentScroll_". This is easier to manage than scrollTop because
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// the scrollTop value depends on the images being loaded or not. For example, if the scrollTop is saved while
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// images are being displayed then restored while images are being reloaded, the new scrollTop might be changed
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// so that it is not greater than contentHeight. On the other hand, with percentScroll it is possible to restore
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// it at any time knowing that it's not going to be changed because the content height has changed.
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// To restore percentScroll the "checkScrollIID" interval is used. It constantly resets the scroll position during
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// one second after the content has been updated.
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//
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// ignoreNextScroll is used to differentiate between scroll event from the users and those that are the result
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// of programmatically changing scrollTop. We only want to respond to events initiated by the user.
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let percentScroll_ = 0;
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let checkScrollIID_ = null;
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function setPercentScroll(percent) {
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percentScroll_ = percent;
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contentElement.scrollTop = percentScroll_ * maxScrollTop();
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}
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function percentScroll() {
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return percentScroll_;
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}
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function restorePercentScroll() {
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setPercentScroll(percentScroll_);
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}
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ipc.setHtml = (event) => {
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const html = event.html;
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markJsHackMarkerInserted_ = false;
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updateBodyHeight();
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contentElement.innerHTML = html;
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let previousContentHeight = contentElement.scrollHeight;
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let startTime = Date.now();
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restorePercentScroll();
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if (!checkScrollIID_) {
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checkScrollIID_ = setInterval(() => {
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const h = contentElement.scrollHeight;
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if (h !== previousContentHeight) {
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previousContentHeight = h;
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restorePercentScroll();
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}
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if (Date.now() - startTime >= 1000) {
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clearInterval(checkScrollIID_);
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checkScrollIID_ = null;
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}
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}, 1);
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}
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loadCssFiles(event.options.cssFiles);
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if (event.options.downloadResources === 'manual') {
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webviewLib.setupResourceManualDownload();
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}
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}
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let ignoreNextScrollEvent = false;
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ipc.setPercentScroll = (event) => {
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const percent = event.percent;
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if (checkScrollIID_) {
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clearInterval(checkScrollIID_);
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checkScrollIID_ = null;
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}
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ignoreNextScrollEvent = true;
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setPercentScroll(percent);
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}
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// HACK for Mark.js bug - https://github.com/julmot/mark.js/issues/127
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let markJsHackMarkerInserted_ = false;
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function addMarkJsSpaceHack(document) {
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if (markJsHackMarkerInserted_) return;
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const prepareElementsForMarkJs = (elements, type) => {
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// const markJsHackMarker_ = '​ ​'
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const markJsHackMarker_ = ' ';
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for (let i = 0; i < elements.length; i++) {
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if (!type) {
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elements[i].innerHTML = elements[i].innerHTML + markJsHackMarker_;
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} else if (type === 'insertBefore') {
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elements[i].insertAdjacentHTML('beforeBegin', markJsHackMarker_);
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}
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}
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}
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prepareElementsForMarkJs(document.getElementsByTagName('p'));
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prepareElementsForMarkJs(document.getElementsByTagName('div'));
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prepareElementsForMarkJs(document.getElementsByTagName('br'), 'insertBefore');
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markJsHackMarkerInserted_ = true;
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}
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let mark_ = null;
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let markSelectedElement_ = null;
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function setMarkers(keywords, options = null) {
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if (!options) options = {};
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// TODO: Add support for scriptType on mobile and CLI
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if (!mark_) {
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mark_ = new Mark(document.getElementById('content'), {
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exclude: ['img'],
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acrossElements: true,
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});
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}
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addMarkJsSpaceHack(document);
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mark_.unmark()
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if (markSelectedElement_) markSelectedElement_.classList.remove('mark-selected');
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let selectedElement = null;
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let elementIndex = 0;
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const onEachElement = (element) => {
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if (!('selectedIndex' in options)) return;
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if (('selectedIndex' in options) && elementIndex === options.selectedIndex) {
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markSelectedElement_ = element;
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element.classList.add('mark-selected');
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selectedElement = element;
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}
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elementIndex++;
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}
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const markKeywordOptions = {
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each: onEachElement,
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};
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if ('separateWordSearch' in options) markKeywordOptions.separateWordSearch = options.separateWordSearch;
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for (let i = 0; i < keywords.length; i++) {
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let keyword = keywords[i];
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markJsUtils.markKeyword(mark_, keyword, {
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pregQuote: pregQuote,
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replaceRegexDiacritics: replaceRegexDiacritics,
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}, markKeywordOptions);
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}
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ipcProxySendToHost('setMarkerCount', elementIndex);
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if (selectedElement) selectedElement.scrollIntoView();
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}
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let markLoaded_ = false;
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ipc.setMarkers = (event) => {
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const keywords = event.keywords;
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const options = event.options;
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if (!keywords.length && !markLoaded_) return;
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if (!markLoaded_) {
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const script = document.createElement('script');
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script.onload = function() {
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setMarkers(keywords, options);
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};
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script.src = '../../node_modules/mark.js/dist/mark.min.js';
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document.getElementById('markScriptContainer').appendChild(script);
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markLoaded_ = true;
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} else {
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setMarkers(keywords, options);
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}
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}
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function maxScrollTop() {
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return Math.max(0, contentElement.scrollHeight - contentElement.clientHeight);
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}
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// The body element needs to have a fixed height for the content to be scrollable
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function updateBodyHeight() {
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document.getElementById('body').style.height = window.innerHeight + 'px';
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}
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contentElement.addEventListener('scroll', webviewLib.logEnabledEventHandler(e => {
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if (ignoreNextScrollEvent) {
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ignoreNextScrollEvent = false;
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return;
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}
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const m = maxScrollTop();
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const percent = m ? contentElement.scrollTop / m : 0;
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setPercentScroll(percent);
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ipcProxySendToHost('percentScroll', percent);
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}));
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document.addEventListener('contextmenu', webviewLib.logEnabledEventHandler(event => {
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let element = event.target;
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// To handle right clicks on resource icons
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if (element && !element.getAttribute('data-resource-id')) element = element.parentElement;
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if (element && element.getAttribute('data-resource-id')) {
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ipcProxySendToHost('contextMenu', {
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type: element.getAttribute('src') ? 'image' : 'resource',
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resourceId: element.getAttribute('data-resource-id'),
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});
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} else {
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const selectedText = window.getSelection().toString();
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if (selectedText) {
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ipcProxySendToHost('contextMenu', {
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type: 'text',
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textToCopy: selectedText,
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});
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} else if (event.target.getAttribute('href')) {
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ipcProxySendToHost('contextMenu', {
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type: 'link',
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textToCopy: event.target.getAttribute('href'),
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});
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}
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}
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}));
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webviewLib.initialize({
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postMessage: ipcProxySendToHost,
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});
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// Disable drag and drop otherwise it's possible to drop a URL
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// on it and it will open in the view as a website.
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document.addEventListener('drop', webviewLib.logEnabledEventHandler(e => {
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e.preventDefault();
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e.stopPropagation();
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}));
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document.addEventListener('dragover', webviewLib.logEnabledEventHandler(e => {
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e.preventDefault();
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e.stopPropagation();
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}));
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document.addEventListener('dragover', webviewLib.logEnabledEventHandler(e => {
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e.preventDefault();
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}));
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window.addEventListener('resize', webviewLib.logEnabledEventHandler(() => {
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updateBodyHeight();
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}));
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updateBodyHeight();
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} catch (error) {
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ipcProxySendToHost('error:' + JSON.stringify(webviewLib.cloneError(error)));
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throw error;
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}
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</script>
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</body>
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</html>
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