mirror of
https://github.com/qvacua/vimr.git
synced 2024-11-28 19:47:41 +03:00
155 lines
4.3 KiB
HTML
155 lines
4.3 KiB
HTML
<!doctype html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<link rel="stylesheet" href="github-markdown.css">
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<script>
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// Scrolling
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const sourceposRegex = /(\d+):(\d+)-(\d+):(\d+)/;
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let suppressNextScrollEvent = false;
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function isTopLeftInsideViewport(el) {
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const rect = el.getBoundingClientRect();
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return rect.top >= 0 && rect.left >= 0;
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}
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function isElementVisibleInViewport(el) {
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const rect = el.getBoundingClientRect();
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return (
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((rect.top >= 0 && window.innerHeight - rect.top >= 0) || (rect.top < 0 && rect.bottom > 0)) &&
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((rect.left >= 0 && window.innerWidth - rect.left >= 0) || (rect.left < 0 && rect.right > 0))
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);
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}
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function positionOfMarkdownElement(element) {
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const regexResult = element.dataset.sourcepos.match(sourceposRegex);
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if (regexResult.length != 5) {
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return null;
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}
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return {
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lineBegin: parseInt(regexResult[1], 10),
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columnBegin: parseInt(regexResult[2], 10),
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lineEnd: parseInt(regexResult[3], 10),
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columnEnd: parseInt(regexResult[4], 10)
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};
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}
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function toArray(nodeList) {
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return Array.prototype.slice.call(nodeList)
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}
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function currentTopMarkdownElement() {
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const mdElements = toArray(document.querySelectorAll("[data-sourcepos]"));
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return mdElements.find(isTopLeftInsideViewport) || mdElements.find(isElementVisibleInViewport);
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}
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let lastMarkdownPosition = {
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lineBegin: 1,
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columnBegin: 1,
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lineEnd: 1,
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columnEnd: 1
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};
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function scrollCallback() {
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const candidate = currentTopMarkdownElement();
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if (!candidate) {
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return;
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}
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const result = positionOfMarkdownElement(candidate);
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if (result.lineBegin == lastMarkdownPosition.lineBegin
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&& result.columnBegin == lastMarkdownPosition.columnBegin
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&& result.lineEnd == lastMarkdownPosition.lineEnd
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&& result.columnEnd == lastMarkdownPosition.columnEnd)
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{
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return;
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}
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lastMarkdownPosition = result;
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// console.log(`webview scrolled to ${result.lineBegin}:${result.columnBegin}`);
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window.webkit.messageHandlers.com_vimr_tools_preview_markdown.postMessage(result);
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}
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let lastKnownScrollPos = 0;
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let ticking = false;
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window.addEventListener('scroll', () => {
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lastKnownScrollPos = window.scrollY;
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if (!ticking) {
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window.requestAnimationFrame(() => {
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if (lastKnownScrollPos >= 0 && !suppressNextScrollEvent) {
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scrollCallback();
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}
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suppressNextScrollEvent = false;
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ticking = false;
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});
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}
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ticking = true;
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});
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// Forward search
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function scrollToPosition(row, column) {
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const entries = toArray(document.querySelectorAll("[data-sourcepos]"))
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.map(element => {
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const position = positionOfMarkdownElement(element);
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return {
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element: element,
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position: position,
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rowDistance: Math.abs(row - position.lineBegin),
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columnDistance: Math.abs(column - position.columnBegin)
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};
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});
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const minRowDistance = entries.reduce((result, entry) => {
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return Math.min(result, entry.rowDistance)
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}, Number.MAX_SAFE_INTEGER);
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const entriesWithMinRowDistance = entries.filter(entry => entry.rowDistance == minRowDistance);
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const minColumnDistance = entriesWithMinRowDistance.reduce((result, entry) => {
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return Math.min(result, entry.columnDistance)
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}, Number.MAX_SAFE_INTEGER);
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const candidateEntry = entriesWithMinRowDistance.find(entry => entry.columnDistance == minColumnDistance);
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if (!candidateEntry) {
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return;
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}
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const element = candidateEntry.element;
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if (isElementVisibleInViewport(element)) {
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return;
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}
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let {x, y} = scrollPosition(element);
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suppressNextScrollEvent = true;
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window.scrollTo(x, y);
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// console.log(`scrolled webview to ${x}:${y}`);
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}
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function scrollPosition(element) {
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let {x, y} = { x: 0, y: 0 };
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let curEl = element;
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while (curEl) {
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x += curEl.offsetLeft;
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y += curEl.offsetTop;
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curEl = curEl.offsetParent;
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}
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return { x: x, y: y };
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}
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</script>
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<title>{{ title }}</title>
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</head>
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<body class="markdown-body">
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{{ body }}
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</body>
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</html>
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