introduce IEditorGroupService and move some methods over from IEditorService (for #1608)

src/vs/workbench/services/group/common/groupService.ts

@@ -0,0 +1,44 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+'use strict';
+
+import {createDecorator, ServiceIdentifier} from 'vs/platform/instantiation/common/instantiation';
+import {Position} from 'vs/platform/editor/common/editor';
+
+export enum GroupArrangement {
+	MINIMIZE_OTHERS,
+	EVEN_WIDTH
+}
+
+export var IEditorGroupService = createDecorator<IEditorGroupService>('editorGroupService');
+
+/**
+ * The editor service allows to open editors and work on the active
+ * editor input and models.
+ */
+export interface IEditorGroupService {
+	serviceId : ServiceIdentifier<any>;
+
+	/**
+	 * Keyboard focus the editor group at the provided position.
+	 */
+	focusGroup(position: Position): void;
+
+	/**
+	 * Activate the editor group at the provided position without moving focus.
+	 */
+	activateGroup(position: Position): void;
+
+	/**
+	 * Allows to move the editor group from one position to another.
+	 */
+	moveGroup(from: Position, to: Position): void;
+
+	/**
+	 * Allows to arrange editor groups according to the GroupArrangement enumeration.
+	 */
+	arrangeGroups(arrangement: GroupArrangement): void;
+}