Merge commit 'be3e8236086165e5e45a5a10783823874b3f3ebd' as 'lib/vscode'

lib/vscode/src/vs/workbench/common/component.ts

@@ -0,0 +1,45 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { Memento, MementoObject } from 'vs/workbench/common/memento';
+import { IThemeService, Themable } from 'vs/platform/theme/common/themeService';
+import { IStorageService, StorageScope } from 'vs/platform/storage/common/storage';
+
+export class Component extends Themable {
+
+	private readonly memento: Memento;
+
+	constructor(
+		private readonly id: string,
+		themeService: IThemeService,
+		storageService: IStorageService
+	) {
+		super(themeService);
+
+		this.id = id;
+		this.memento = new Memento(this.id, storageService);
+
+		this._register(storageService.onWillSaveState(() => {
+
+			// Ask the component to persist state into the memento
+			this.saveState();
+
+			// Then save the memento into storage
+			this.memento.saveMemento();
+		}));
+	}
+
+	getId(): string {
+		return this.id;
+	}
+
+	protected getMemento(scope: StorageScope): MementoObject {
+		return this.memento.getMemento(scope);
+	}
+
+	protected saveState(): void {
+		// Subclasses to implement for storing state
+	}
+}