Move files to better folders and add better name

extensions/markdown-language-features/src/util/topmostLineMonitor.ts

@@ -1,110 +0,0 @@
-/*---------------------------------------------------------------------------------------------
- *  Copyright (c) Microsoft Corporation. All rights reserved.
- *  Licensed under the MIT License. See License.txt in the project root for license information.
- *--------------------------------------------------------------------------------------------*/
-
-import * as vscode from 'vscode';
-import { Disposable } from '../util/dispose';
-import { isMarkdownFile } from './file';
-
-export interface LastScrollLocation {
-	readonly line: number;
-	readonly uri: vscode.Uri;
-}
-
-export class TopmostLineMonitor extends Disposable {
-
-	private readonly pendingUpdates = new Map<string, number>();
-	private readonly throttle = 50;
-	private previousTextEditorInfo = new Map<string, LastScrollLocation>();
-	private previousStaticEditorInfo = new Map<string, LastScrollLocation>();
-
-	constructor() {
-		super();
-
-		if (vscode.window.activeTextEditor) {
-			const line = getVisibleLine(vscode.window.activeTextEditor);
-			this.setPreviousTextEditorLine({ uri: vscode.window.activeTextEditor.document.uri, line: line ?? 0 });
-		}
-
-		this._register(vscode.window.onDidChangeTextEditorVisibleRanges(event => {
-			if (isMarkdownFile(event.textEditor.document)) {
-				const line = getVisibleLine(event.textEditor);
-				if (typeof line === 'number') {
-					this.updateLine(event.textEditor.document.uri, line);
-					this.setPreviousTextEditorLine({ uri: event.textEditor.document.uri, line: line });
-				}
-			}
-		}));
-	}
-
-	private readonly _onChanged = this._register(new vscode.EventEmitter<{ readonly resource: vscode.Uri; readonly line: number }>());
-	public readonly onDidChanged = this._onChanged.event;
-
-	public setPreviousStaticEditorLine(scrollLocation: LastScrollLocation): void {
-		this.previousStaticEditorInfo.set(scrollLocation.uri.toString(), scrollLocation);
-	}
-
-	public getPreviousStaticEditorLineByUri(resource: vscode.Uri): number | undefined {
-		const scrollLoc = this.previousStaticEditorInfo.get(resource.toString());
-		this.previousStaticEditorInfo.delete(resource.toString());
-		return scrollLoc?.line;
-	}
-
-
-	public setPreviousTextEditorLine(scrollLocation: LastScrollLocation): void {
-		this.previousTextEditorInfo.set(scrollLocation.uri.toString(), scrollLocation);
-	}
-
-	public getPreviousTextEditorLineByUri(resource: vscode.Uri): number | undefined {
-		const scrollLoc = this.previousTextEditorInfo.get(resource.toString());
-		this.previousTextEditorInfo.delete(resource.toString());
-		return scrollLoc?.line;
-	}
-
-	public getPreviousStaticTextEditorLineByUri(resource: vscode.Uri): number | undefined {
-		const state = this.previousStaticEditorInfo.get(resource.toString());
-		return state?.line;
-	}
-
-	public updateLine(
-		resource: vscode.Uri,
-		line: number
-	) {
-		const key = resource.toString();
-		if (!this.pendingUpdates.has(key)) {
-			// schedule update
-			setTimeout(() => {
-				if (this.pendingUpdates.has(key)) {
-					this._onChanged.fire({
-						resource,
-						line: this.pendingUpdates.get(key) as number
-					});
-					this.pendingUpdates.delete(key);
-				}
-			}, this.throttle);
-		}
-
-		this.pendingUpdates.set(key, line);
-	}
-}
-
-/**
- * Get the top-most visible range of `editor`.
- *
- * Returns a fractional line number based the visible character within the line.
- * Floor to get real line number
- */
-export function getVisibleLine(
-	editor: vscode.TextEditor
-): number | undefined {
-	if (!editor.visibleRanges.length) {
-		return undefined;
-	}
-
-	const firstVisiblePosition = editor.visibleRanges[0].start;
-	const lineNumber = firstVisiblePosition.line;
-	const line = editor.document.lineAt(lineNumber);
-	const progress = firstVisiblePosition.character / (line.text.length + 2);
-	return lineNumber + progress;
-}