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improve markdown preview scroll sync (#58852)

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* improve markdown preview scroll sync
This commit is contained in:
SteVen Batten 2018-09-18 15:08:37 -07:00 committed by GitHub
parent 0f4893299a
commit f8f4d3af30
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GPG key ID: 4AEE18F83AFDEB23
7 changed files with 112 additions and 11 deletions
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25
extensions/markdown-language-features/media/index.js
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2
extensions/markdown-language-features/media/pre.js
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28
extensions/markdown-language-features/preview-src/index.ts
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@ -27,6 +27,10 @@ const messaging = createPosterForVsCode(vscode);
window.cspAlerter.setPoster(messaging);
window.styleLoadingMonitor.setPoster(messaging);
window.onload = () => {
updateImageSizes();
};
onceDocumentLoaded(() => {
if (settings.scrollPreviewWithEditor) {
setTimeout(() => {
@ -53,8 +57,32 @@ const onUpdateView = (() => {
};
})();
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;
updateImageSizes();
}, true);
window.addEventListener('message', event => {

12
extensions/markdown-language-features/src/features/preview.ts
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@ -33,6 +33,7 @@ export class MarkdownPreview {
private forceUpdate = false;
private isScrolling = false;
private _disposed: boolean = false;
private imageInfo: { id: string, width: number, height: number }[] = [];
public static async revive(
webview: vscode.WebviewPanel,
@ -123,6 +124,10 @@ export class MarkdownPreview {
}
switch (e.type) {
case 'cacheImageSizes':
this.onCacheImageSizes(e.body);
break;
case 'command':
vscode.commands.executeCommand(e.body.command, ...e.body.args);
break;
@ -181,7 +186,8 @@ export class MarkdownPreview {
return {
resource: this.resource.toString(),
locked: this._locked,
line: this.line
line: this.line,
imageInfo: this.imageInfo
};
}
@ -400,6 +406,10 @@ export class MarkdownPreview {
vscode.workspace.openTextDocument(this._resource).then(vscode.window.showTextDocument);
}
private async onCacheImageSizes(imageInfo: { id: string, width: number, height: number }[]) {
this.imageInfo = imageInfo;
}
}
export interface PreviewSettings {

22
extensions/markdown-language-features/src/features/previewContentProvider.ts
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@ -79,7 +79,7 @@ export class MarkdownContentProvider {
data-strings="${JSON.stringify(previewStrings).replace(/"/g, '&quot;')}"
data-state="${JSON.stringify(state || {}).replace(/"/g, '&quot;')}">
<script src="${this.extensionResourcePath('pre.js')}" nonce="${nonce}"></script>
${this.getStyles(sourceUri, nonce, config)}
${this.getStyles(sourceUri, nonce, config, state)}
<base href="${markdownDocument.uri.with({ scheme: 'vscode-resource' }).toString(true)}">
</head>
<body class="vscode-body ${config.scrollBeyondLastLine ? 'scrollBeyondLastLine' : ''} ${config.wordWrap ? 'wordWrap' : ''} ${config.markEditorSelection ? 'showEditorSelection' : ''}">
@ -147,14 +147,30 @@ export class MarkdownContentProvider {
</style>`;
}
private getStyles(resource: vscode.Uri, nonce: string, config: MarkdownPreviewConfiguration): string {
private getImageStabilizerStyles(state?: any) {
let ret = '<style>\n';
if (state && state.imageInfo) {
state.imageInfo.forEach((imgInfo: any) => {
ret += `#${imgInfo.id}.loading {
height: ${imgInfo.height}px;
width: ${imgInfo.width}px;
}\n`;
});
}
ret += '</style>\n';
return ret;
}
private getStyles(resource: vscode.Uri, nonce: string, config: MarkdownPreviewConfiguration, state?: any): string {
const baseStyles = this.contributions.previewStyles
.map(resource => `<link rel="stylesheet" type="text/css" href="${resource.toString()}">`)
.join('\n');
return `${baseStyles}
${this.getSettingsOverrideStyles(nonce, config)}
${this.computeCustomStyleSheetIncludes(resource, config)}`;
${this.computeCustomStyleSheetIncludes(resource, config)}
${this.getImageStabilizerStyles(state)}`;
}
private getScripts(nonce: string): string {

24
extensions/markdown-language-features/src/markdownEngine.ts
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@ -6,6 +6,7 @@
import { MarkdownIt, Token } from 'markdown-it';
import * as path from 'path';
import * as vscode from 'vscode';
import * as crypto from 'crypto';
import { MarkdownContributions } from './markdownExtensions';
import { Slugifier } from './slugify';
import { getUriForLinkWithKnownExternalScheme } from './util/links';
@ -62,6 +63,7 @@ export class MarkdownEngine {
this.addLineNumberRenderer(this.md, renderName);
}
this.addImageStabilizer(this.md);
this.addFencedRenderer(this.md);
this.addLinkNormalizer(this.md);
@ -131,6 +133,28 @@ export class MarkdownEngine {
};
}
private addImageStabilizer(md: any): void {
const original = md.renderer.rules.image;
md.renderer.rules.image = (tokens: any, idx: number, options: any, env: any, self: any) => {
const token = tokens[idx];
token.attrJoin('class', 'loading');
const src = token.attrGet('src');
if (src) {
const hash = crypto.createHash('sha256');
hash.update(src);
const imgHash = hash.digest('hex');
token.attrSet('id', `image-hash-${imgHash}`);
}
if (original) {
return original(tokens, idx, options, env, self);
} else {
return self.renderToken(tokens, idx, options, env, self);
}
};
}
private addFencedRenderer(md: any): void {
const original = md.renderer.rules['fenced'];
md.renderer.rules['fenced'] = (tokens: any, idx: number, options: any, env: any, self: any) => {

10
src/vs/workbench/parts/webview/electron-browser/webview-pre.js
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@ -308,21 +308,21 @@
const frame = getActiveFrame();
// keep current scrollTop around and use later
// keep current scrollY around and use later
var setInitialScrollPosition;
if (firstLoad) {
firstLoad = false;
setInitialScrollPosition = (body, window) => {
if (!isNaN(initData.initialScrollProgress)) {
if (body.scrollTop === 0) {
if (window.scrollY === 0) {
window.scroll(0, body.clientHeight * initData.initialScrollProgress);
}
}
};
} else {
const scrollY = frame && frame.contentDocument && frame.contentDocument.body ? frame.contentDocument.body.scrollTop : 0;
const scrollY = frame && frame.contentDocument && frame.contentDocument.body ? frame.contentWindow.scrollY : 0;
setInitialScrollPosition = (body, window) => {
if (body.scrollTop === 0) {
if (window.scrollY === 0) {
window.scroll(0, scrollY);
}
};
@ -359,7 +359,7 @@
var onLoad = (contentDocument, contentWindow) => {
if (contentDocument.body) {
// Workaround for https://github.com/Microsoft/vscode/issues/12865
// check new scrollTop and reset if neccessary
// check new scrollY and reset if neccessary
setInitialScrollPosition(contentDocument.body, contentWindow);
}