@Seb-Tur You can use Qt::WaitCursor like in https://stackoverflow.com/questions/13495283/change-cursor-to-hourglass-wait-busy-cursor-and-back-in-qt. There is also QProgressBar/Dialog.

No, bad design. The child should never even know who its parent is. The correct process is to push information downstream. The child should have setters for all the data it need. The manwindow calls those setters.

@MrErfan Are you sure the role's assigned in QML match with those returned from the model ? They are case-sensitive.