code-server/extensions/markdown-language-features/preview-src/index.ts

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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { ActiveLineMarker } from './activeLineMarker';
import { onceDocumentLoaded } from './events';
import { createPosterForVsCode } from './messaging';
import { getEditorLineNumberForPageOffset, scrollToRevealSourceLine, getLineElementForFragment } from './scroll-sync';
import { getSettings, getData } from './settings';
import throttle = require('lodash.throttle');
declare let acquireVsCodeApi: any;
let scrollDisabled = true;
const marker = new ActiveLineMarker();
const settings = getSettings();
const vscode = acquireVsCodeApi();
const originalState = vscode.getState();
const state = {
...(typeof originalState === 'object' ? originalState : {}),
...getData<any>('data-state')
};
// Make sure to sync VS Code state here
vscode.setState(state);
const messaging = createPosterForVsCode(vscode);
window.cspAlerter.setPoster(messaging);
window.styleLoadingMonitor.setPoster(messaging);
window.onload = () => {
updateImageSizes();
};
onceDocumentLoaded(() => {
const scrollProgress = state.scrollProgress;
if (typeof scrollProgress === 'number' && !settings.fragment) {
setImmediate(() => {
scrollDisabled = true;
window.scrollTo(0, scrollProgress * document.body.clientHeight);
});
return;
}
if (settings.scrollPreviewWithEditor) {
setImmediate(() => {
// Try to scroll to fragment if available
if (settings.fragment) {
state.fragment = undefined;
vscode.setState(state);
const element = getLineElementForFragment(settings.fragment);
if (element) {
scrollDisabled = true;
scrollToRevealSourceLine(element.line);
}
} else {
if (!isNaN(settings.line!)) {
scrollDisabled = true;
scrollToRevealSourceLine(settings.line!);
}
}
});
}
});
const onUpdateView = (() => {
const doScroll = throttle((line: number) => {
scrollDisabled = true;
scrollToRevealSourceLine(line);
}, 50);
return (line: number) => {
if (!isNaN(line)) {
state.line = line;
doScroll(line);
}
};
})();
let updateImageSizes = throttle(() => {
const imageInfo: { id: string, height: number, width: number; }[] = [];
let images = document.getElementsByTagName('img');
if (images) {
let i;
for (i = 0; i < images.length; i++) {
const img = images[i];
if (img.classList.contains('loading')) {
img.classList.remove('loading');
}
imageInfo.push({
id: img.id,
height: img.height,
width: img.width
});
}
messaging.postMessage('cacheImageSizes', imageInfo);
}
}, 50);
window.addEventListener('resize', () => {
scrollDisabled = true;
updateScrollProgress();
updateImageSizes();
}, true);
window.addEventListener('message', event => {
if (event.data.source !== settings.source) {
return;
}
switch (event.data.type) {
case 'onDidChangeTextEditorSelection':
marker.onDidChangeTextEditorSelection(event.data.line);
break;
case 'updateView':
onUpdateView(event.data.line);
break;
}
}, false);
document.addEventListener('dblclick', event => {
if (!settings.doubleClickToSwitchToEditor) {
return;
}
// Ignore clicks on links
for (let node = event.target as HTMLElement; node; node = node.parentNode as HTMLElement) {
if (node.tagName === 'A') {
return;
}
}
const offset = event.pageY;
const line = getEditorLineNumberForPageOffset(offset);
if (typeof line === 'number' && !isNaN(line)) {
messaging.postMessage('didClick', { line: Math.floor(line) });
}
});
const passThroughLinkSchemes = ['http:', 'https:', 'mailto:', 'vscode:', 'vscode-insiders:'];
document.addEventListener('click', event => {
if (!event) {
return;
}
let node: any = event.target;
while (node) {
if (node.tagName && node.tagName === 'A' && node.href) {
if (node.getAttribute('href').startsWith('#')) {
return;
}
let hrefText = node.getAttribute('data-href');
if (!hrefText) {
// Pass through known schemes
if (passThroughLinkSchemes.some(scheme => node.href.startsWith(scheme))) {
return;
}
hrefText = node.getAttribute('href');
}
// If original link doesn't look like a url, delegate back to VS Code to resolve
if (!/^[a-z\-]+:/i.test(hrefText)) {
messaging.postMessage('openLink', { href: hrefText });
event.preventDefault();
event.stopPropagation();
return;
}
return;
}
node = node.parentNode;
}
}, true);
window.addEventListener('scroll', throttle(() => {
updateScrollProgress();
if (scrollDisabled) {
scrollDisabled = false;
} else {
const line = getEditorLineNumberForPageOffset(window.scrollY);
if (typeof line === 'number' && !isNaN(line)) {
messaging.postMessage('revealLine', { line });
}
}
}, 50));
function updateScrollProgress() {
state.scrollProgress = window.scrollY / document.body.clientHeight;
vscode.setState(state);
}