Put 'loading' text while loading the saved controllers in Big Data Cluster extension (#6375)

extensions/big-data-cluster/src/bigDataCluster/tree/loadingControllerNode.ts

@@ -0,0 +1,47 @@
+/*---------------------------------------------------------------------------------------------
+ *  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 * as nls from 'vscode-nls';
+import * as azdata from 'azdata';
+import * as vscode from 'vscode';
+import { TreeNode } from './treeNode';
+import { BdcItemType } from '../constants';
+
+const localize = nls.loadMessageBundle();
+
+export class LoadingControllerNode extends TreeNode {
+	private readonly nodeType: string;
+
+	constructor() {
+		super(localize('textLoadingWithDots', "Loading..."));
+		this.nodeType = BdcItemType.loadingController;
+	}
+
+	public async getChildren(): Promise<TreeNode[]> {
+		return [];
+	}
+
+	public getTreeItem(): vscode.TreeItem {
+		let item = new vscode.TreeItem(this.label, vscode.TreeItemCollapsibleState.None);
+		item.contextValue = this.nodeType;
+		return item;
+	}
+
+	public getNodeInfo(): azdata.NodeInfo {
+		return {
+			label: this.label,
+			isLeaf: this.isLeaf,
+			errorMessage: undefined,
+			metadata: undefined,
+			nodePath: this.nodePath,
+			nodeStatus: undefined,
+			nodeType: this.nodeType,
+			iconType: this.nodeType,
+			nodeSubType: undefined
+		};
+	}
+}