Move SQL 2019 extension's notebook code into Azure Data Studio (#4090)

extensions/notebook/src/prompts/progressIndicator.ts

@@ -0,0 +1,70 @@
+'use strict';
+
+// This code is originally from https://github.com/DonJayamanne/bowerVSCode
+// License: https://github.com/DonJayamanne/bowerVSCode/blob/master/LICENSE
+
+import { window, StatusBarItem, StatusBarAlignment } from 'vscode';
+
+export default class ProgressIndicator {
+
+	private _statusBarItem: StatusBarItem;
+
+	constructor() {
+		this._statusBarItem = window.createStatusBarItem(StatusBarAlignment.Left);
+	}
+
+	private _tasks: string[] = [];
+	public beginTask(task: string): void {
+		this._tasks.push(task);
+		this.displayProgressIndicator();
+	}
+
+	public endTask(task: string): void {
+		if (this._tasks.length > 0) {
+			this._tasks.pop();
+		}
+
+		this.setMessage();
+	}
+
+	private setMessage(): void {
+		if (this._tasks.length === 0) {
+			this._statusBarItem.text = '';
+			this.hideProgressIndicator();
+			return;
+		}
+
+		this._statusBarItem.text = this._tasks[this._tasks.length - 1];
+		this._statusBarItem.show();
+	}
+
+	private _interval: any;
+	private displayProgressIndicator(): void {
+		this.setMessage();
+		this.hideProgressIndicator();
+		this._interval = setInterval(() => this.onDisplayProgressIndicator(), 100);
+	}
+	private hideProgressIndicator(): void {
+		if (this._interval) {
+			clearInterval(this._interval);
+			this._interval = undefined;
+		}
+		this.ProgressCounter = 0;
+	}
+
+	private ProgressText = ['|', '/', '-', '\\', '|', '/', '-', '\\'];
+	private ProgressCounter = 0;
+	private onDisplayProgressIndicator(): void {
+		if (this._tasks.length === 0) {
+			return;
+		}
+
+		let txt = this.ProgressText[this.ProgressCounter];
+		this._statusBarItem.text = this._tasks[this._tasks.length - 1] + ' ' + txt;
+		this.ProgressCounter++;
+
+		if (this.ProgressCounter >= this.ProgressText.length - 1) {
+			this.ProgressCounter = 0;
+		}
+	}
+}