Remove children on ExtHost side and refactor

src/vs/workbench/api/node/mainThreadTreeExplorers.ts

@@ -0,0 +1,46 @@
+/*---------------------------------------------------------------------------------------------
+ *  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 { TreeExplorerNode } from 'vscode';
+import { TPromise } from 'vs/base/common/winjs.base';
+import { IThreadService } from 'vs/workbench/services/thread/common/threadService';
+import { ExtHostContext, MainThreadTreeExplorersShape, ExtHostTreeExplorersShape } from './extHost.protocol';
+import { ITreeExplorerViewletService } from 'vs/workbench/parts/explorers/browser/treeExplorerViewletService';
+import { InternalTreeExplorerNode } from 'vs/workbench/parts/explorers/common/treeExplorerViewModel';
+
+export class MainThreadTreeExplorers extends MainThreadTreeExplorersShape {
+	private _proxy: ExtHostTreeExplorersShape;
+
+	private _treeContents: { [treeContentProviderId: string]: InternalTreeExplorerNode };
+
+	constructor(
+		@IThreadService threadService: IThreadService,
+		@ITreeExplorerViewletService private treeExplorerViewletService: ITreeExplorerViewletService
+	) {
+		super();
+
+		this._proxy = threadService.get(ExtHostContext.ExtHostExplorers);
+		this._treeContents = Object.create(null);
+	}
+
+	$registerTreeContentProvider(providerId: string): void {
+		this.treeExplorerViewletService.registerTreeContentProvider(providerId, {
+			provideRootNode: (): TPromise<InternalTreeExplorerNode> => {
+				return this._proxy.$provideRootNode(providerId).then(treeContent => {
+					this._treeContents[providerId] = treeContent;
+					return treeContent;
+				})
+			},
+			resolveChildren: (node: InternalTreeExplorerNode): TPromise<InternalTreeExplorerNode[]> => {
+				return this._proxy.$resolveChildren(providerId, node);
+			}
+		});
+	}
+
+	$unregisterTreeContentProvider(treeContentProviderId: string): void {
+
+	}
+}