This widget is a spinner or activity indicator. Spinners provide visual feedback to users use when performing an activity for an unknown duration such as processing a large amount of data or presenting a complex user interface.
You use it just making it visible or invisible.
An alternative can be an animated GIF image.
- markerCount: the number of dots of the spinner
- ScaleMarkers: If true the markers have different size, otherwise they are all of the same size.