Qt + QML is IMO not just the currently best way, but also some kind of global optimum for me (coming from Swing, SWT and WPF/XAML). The data dependency handling

Qt + QML is IMO not just the currently best way, but also some kind of global optimum for me (coming from Swing, SWT and WPF/XAML). The data dependency handling is incredibly well done (it sometimes feels like using a Rx library without all the boilerplate), the handling of visual state is superb (think VisualStateManager without 4 pages of XAML).