mirror of
https://github.com/laurent22/joplin.git
synced 2024-12-15 09:04:04 +02:00
193 lines
5.6 KiB
HTML
193 lines
5.6 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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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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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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.katex { font-size: 1.3em; } /* This controls the global Katex font size*/
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</style>
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</head>
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<body>
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<div id="hlScriptContainer"></div>
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<div id="content" ondragstart="return false;" ondrop="return false;"></div>
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<script>
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const { ipcRenderer } = require('electron');
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const contentElement = document.getElementById('content');
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// ----------------------------------------------------------------------
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// Handle dynamically loading HLJS when a code element is present
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// ----------------------------------------------------------------------
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let hljsScriptAdded = false;
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let hljsLoaded = false;
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function loadHljs(callback) {
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hljsScriptAdded = true;
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const script = document.createElement('script');
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script.onload = function () {
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hljsLoaded = true;
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applyHljs();
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};
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script.src = 'highlight/highlight.pack.js';
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document.getElementById('hlScriptContainer').appendChild(script);
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const link = document.createElement('link');
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link.rel = 'stylesheet';
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// https://ace.c9.io/build/kitchen-sink.html
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// https://highlightjs.org/static/demo/
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link.href = 'highlight/styles/atom-one-light.css';
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document.getElementById('hlScriptContainer').appendChild(link);
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}
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function loadAndApplyHljs() {
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var codeElements = document.getElementsByClassName('code');
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if (!codeElements.length) return;
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if (!hljsScriptAdded) {
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this.loadHljs();
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return;
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}
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// If HLJS is not loaded yet, no need to do anything. When it loads
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// it will automatically apply the style to all the code elements.
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if (hljsLoaded) applyHljs(codeElements);
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}
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function applyHljs(codeElements) {
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if (typeof codeElements === 'undefined') codeElements = document.getElementsByClassName('code');
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for (var i = 0; i < codeElements.length; i++) {
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try {
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hljs.highlightBlock(codeElements[i]);
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} catch (error) {
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console.warn('Cannot highlight code', error);
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}
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}
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}
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// ----------------------------------------------------------------------
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// / Handle dynamically loading HLJS when a code element is present
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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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ipcRenderer.on('setHtml', (event, html) => {
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contentElement.innerHTML = html;
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loadAndApplyHljs();
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// Remove the bullet from "ul" for checkbox lists and extra padding
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const checkboxes = document.getElementsByClassName('checkbox');
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for (let i = 0; i < checkboxes.length; i++) {
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const cb = checkboxes[i];
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const ul = cb.parentElement.parentElement;
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if (!ul) {
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console.warn('Unexpected layout for checkbox');
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continue;
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}
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ul.style.listStyleType = 'none';
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ul.style.paddingLeft = 0;
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}
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let previousContentHeight = contentElement.scrollHeight;
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let startTime = Date.now();
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ignoreNextScrollEvent = true;
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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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ignoreNextScrollEvent = true;
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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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});
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let ignoreNextScrollEvent = false;
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ipcRenderer.on('setPercentScroll', (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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function maxScrollTop() {
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return Math.max(0, contentElement.scrollHeight - contentElement.clientHeight);
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}
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contentElement.addEventListener('scroll', function(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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ipcRenderer.sendToHost('percentScroll', percent);
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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', function(e) {
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e.preventDefault();
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e.stopPropagation();
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});
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document.addEventListener('dragover', function(e) {
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e.preventDefault();
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e.stopPropagation();
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});
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document.addEventListener('dragover', function(e) {
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e.preventDefault();
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});
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</script>
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</body>
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</html> |