Microsoft/vscode
1
0
Fork 0
mirror of https://github.com/microsoft/vscode.git synced 2026-04-27 03:54:24 +01:00
Code Issues Packages Projects Releases Wiki Activity

scroll state persists while toggling between static preview and text

Browse Source
This commit is contained in:
Andrea Mah
2021-05-12 16:59:57 -06:00
parent 22fc27d4cf
commit 18950181eb
3 changed files with 66 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
extensions/markdown-language-features/src/util/topmostLineMonitor.ts
View File

@@ -7,13 +7,21 @@ import * as vscode from 'vscode';
import { Disposable } from '../util/dispose';
import { isMarkdownFile } from './file';
export interface LastScrollLocation {
readonly line: number;
readonly uri: vscode.Uri | undefined;
}
export class TopmostLineMonitor extends Disposable {
private readonly pendingUpdates = new Map<string, number>();
private readonly throttle = 50;
public previousMDTextEditor: vscode.TextEditor | undefined;
public previousStaticEditorInfo: LastScrollLocation = { line: 0, uri: undefined };
constructor() {
super();
this.previousMDTextEditor = vscode.window.activeTextEditor;
this._register(vscode.window.onDidChangeTextEditorVisibleRanges(event => {
if (isMarkdownFile(event.textEditor.document)) {
const line = getVisibleLine(event.textEditor);
@@ -22,6 +30,21 @@ export class TopmostLineMonitor extends Disposable {
}
}
}));
this._register(vscode.window.onDidChangeActiveTextEditor(textEditor => {
// When at a markdown file, apply existing scroll settings from static preview if applicable.
// Also save reference to text editor for line number reference later
if (textEditor && isMarkdownFile(textEditor.document!)) {
if (this.previousStaticEditorInfo.uri?.toString() === textEditor.document.uri.toString()) {
const line = this.previousStaticEditorInfo.line ? this.previousStaticEditorInfo.line : 0;
scrollEditorToLine(line, textEditor);
}
this.previousMDTextEditor = textEditor;
}
}));
}
private readonly _onChanged = this._register(new vscode.EventEmitter<{ readonly resource: vscode.Uri, readonly line: number }>());
@@ -68,3 +91,18 @@ export function getVisibleLine(
const progress = firstVisiblePosition.character / (line.text.length + 2);
return lineNumber + progress;
}
/**
* Change the top-most visible line of `editor` to be at `line`
*/
export function scrollEditorToLine(
line: number,
editor: vscode.TextEditor
) {
const sourceLine = Math.floor(line);
const fraction = line - sourceLine;
const text = editor.document.lineAt(sourceLine).text;
const start = Math.floor(fraction * text.length);
editor.revealRange(
new vscode.Range(sourceLine, start, sourceLine + 1, 0),
vscode.TextEditorRevealType.AtTop);
}