Added output "opened" to component (#546)

Added new output "opened" that will be emitted every time the components options dropdown changes visibility

components/select/select.ts

@@ -298,6 +298,7 @@ export class SelectComponent implements OnInit {
   @Output() public selected:EventEmitter<any> = new EventEmitter();
   @Output() public removed:EventEmitter<any> = new EventEmitter();
   @Output() public typed:EventEmitter<any> = new EventEmitter();
+  @Output() public opened:EventEmitter<any> = new EventEmitter();
 
   public options:Array<SelectItem> = [];
   public itemObjects:Array<SelectItem> = [];
@@ -308,8 +309,17 @@ export class SelectComponent implements OnInit {
     return this._active;
   }
 
+  private set optionsOpened(value:boolean){
+    this._optionsOpened = value;
+    this.opened.emit(value);
+  }
+
+  private get optionsOpened(): boolean{
+    return this._optionsOpened;
+  }
+
   private inputMode:boolean = false;
-  private optionsOpened:boolean = false;
+  private _optionsOpened:boolean = false;
   private behavior:OptionsBehavior;
   private inputValue:string = '';
   private _items:Array<any> = [];