SpinBox like a slider

[Alundra]

I didn't knew QStackedWidget, I tried and the switch works nicely but one problem remains who is the slider who needs to be like a button, so the slider must works on all the surface of the widget and not just the bar of the slider like the basic slider widget does.
The goal is to have a widget of this style : http://uppix.com/f-spinbox_slider5271107600146aae.png.
The stylesheet is the best way to achieve that or a better solution exist ?
Thanks for the help