list.onContextMenu

src/vs/base/browser/ui/list/listWidget.ts

@@ -6,11 +6,12 @@
 import 'vs/css!./list';
 import { IDisposable, dispose } from 'vs/base/common/lifecycle';
 import { isNumber } from 'vs/base/common/types';
+import { memoize } from 'vs/base/common/decorators';
 import * as DOM from 'vs/base/browser/dom';
 import { EventType as TouchEventType } from 'vs/base/browser/touch';
 import { KeyCode } from 'vs/base/common/keyCodes';
 import { StandardKeyboardEvent } from 'vs/base/browser/keyboardEvent';
-import Event, { Emitter, EventBufferer, chain, mapEvent } from 'vs/base/common/event';
+import Event, { Emitter, EventBufferer, chain, mapEvent, fromCallback } from 'vs/base/common/event';
 import { domEvent } from 'vs/base/browser/event';
 import { IDelegate, IRenderer, IListMouseEvent, IFocusChangeEvent, ISelectionChangeEvent } from './list';
 import { ListView, IListViewOptions } from './listView';
@@ -217,14 +218,21 @@ export class List<T> implements IDisposable {
 	private controller: Controller<T>;
 	private disposables: IDisposable[];
 
+	@memoize
 	get onFocusChange(): Event<IFocusChangeEvent<T>> {
 		return this.eventBufferer.wrapEvent(mapEvent(this.focus.onChange, e => this.toListEvent(e)));
 	}
 
+	@memoize
 	get onSelectionChange(): Event<ISelectionChangeEvent<T>> {
 		return this.eventBufferer.wrapEvent(mapEvent(this.selection.onChange, e => this.toListEvent(e)));
 	}
 
+	@memoize
+	get onContextMenu(): Event<IListMouseEvent<T>> {
+		return fromCallback(handler => this.view.addListener('contextmenu', handler));
+	}
+
 	private _onDOMFocus: Event<FocusEvent>;
 	get onDOMFocus(): Event<FocusEvent> { return this._onDOMFocus; }
 

src/vs/base/common/event.ts

@@ -223,6 +223,17 @@ export function fromEventEmitter<T>(emitter: EventEmitter, eventType: string): E
 	};
 }
 
+export function fromCallback<T>(fn: (handler: (e: T) => void) => IDisposable): Event<T> {
+	let listener: IDisposable;
+
+	const emitter = new Emitter<T>({
+		onFirstListenerAdd: () => listener = fn(e => emitter.fire(e)),
+		onLastListenerRemove: () => listener.dispose()
+	});
+
+	return emitter.event;
+}
+
 export function fromPromise(promise: TPromise<any>): Event<void> {
 	const emitter = new Emitter<void>();
 	let shouldEmit = false;