Drag 'n' Drop could be improved. A first approach that can be also useful in other context is to allow to read mouse position of a TouchArea event it is not pressed. And also allow this if an other TouchArea is pressed. By Drag 'n' Drop you need to read to read the mouse position on the element you want to drag (drag target) and then the mouse position of the element you want drop in (drop target). In the hand it would be great to have dedicated drag and drop handlers e.g. on the TouchArea.