Feature/tree component (#2077)

*added tree component to the model builder

src/sql/parts/modelComponents/tree/treeViewDataProvider.ts

@@ -0,0 +1,39 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+'use strict';
+
+import { ExtHostModelViewTreeViewsShape, SqlExtHostContext } from 'sql/workbench/api/node/sqlExtHost.protocol';
+import { IExtHostContext } from 'vs/workbench/api/node/extHost.protocol';
+import { IModelViewTreeViewDataProvider, ITreeComponentItem } from 'sql/workbench/common/views';
+import { INotificationService } from 'vs/platform/notification/common/notification';
+import * as vsTreeView from 'vs/workbench/api/electron-browser/mainThreadTreeViews';
+
+
+export class TreeViewDataProvider extends vsTreeView.TreeViewDataProvider implements IModelViewTreeViewDataProvider {
+	constructor(handle: number, treeViewId: string,
+		context: IExtHostContext,
+		notificationService?: INotificationService
+	) {
+		super(`${handle}-${treeViewId}`, context.getProxy(SqlExtHostContext.ExtHostModelViewTreeViews), notificationService);
+	}
+
+	onNodeCheckedChanged(treeViewId: string, treeItemHandle?: string, checked?: boolean) {
+		(<ExtHostModelViewTreeViewsShape>this._proxy).$onNodeCheckedChanged(treeViewId, treeItemHandle, checked);
+	}
+
+	protected postGetChildren(elements: ITreeComponentItem[]): ITreeComponentItem[] {
+		const result = [];
+		if (elements) {
+			for (const element of elements) {
+				element.onCheckedChanged = (checked: boolean) => {
+					this.onNodeCheckedChanged(this.treeViewId, element.handle, checked);
+				};
+				this.itemsMap.set(element.handle, element);
+				result.push(element);
+			}
+		}
+		return result;
+	}
+}