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

@@ -4,33 +4,28 @@
  *--------------------------------------------------------------------------------------------*/
 
 import * as vscode from 'vscode';
-import { disposeAll } from '../util/dispose';
+import { Disposable } from '../util/dispose';
 import { isMarkdownFile } from './file';
 
-export class MarkdownFileTopmostLineMonitor {
-	private readonly disposables: vscode.Disposable[] = [];
+export class TopmostLineMonitor extends Disposable {
 
 	private readonly pendingUpdates = new Map<string, number>();
-
 	private readonly throttle = 50;
 
 	constructor() {
-		vscode.window.onDidChangeTextEditorVisibleRanges(event => {
+		super();
+		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);
 				}
 			}
-		}, null, this.disposables);
+		}));
 	}
 
-	dispose() {
-		disposeAll(this.disposables);
-	}
-
-	private readonly _onDidChangeTopmostLineEmitter = new vscode.EventEmitter<{ resource: vscode.Uri, line: number }>();
-	public readonly onDidChangeTopmostLine = this._onDidChangeTopmostLineEmitter.event;
+	private readonly _onChanged = this._register(new vscode.EventEmitter<{ readonly resource: vscode.Uri, readonly line: number }>());
+	public readonly onDidChanged = this._onChanged.event;
 
 	private updateLine(
 		resource: vscode.Uri,
@@ -41,7 +36,7 @@ export class MarkdownFileTopmostLineMonitor {
 			// schedule update
 			setTimeout(() => {
 				if (this.pendingUpdates.has(key)) {
-					this._onDidChangeTopmostLineEmitter.fire({
+					this._onChanged.fire({
 						resource,
 						line: this.pendingUpdates.get(key) as number
 					});