Qt framework started its life as a GUI widget's library, much like Tk, GTK+, or Java's AWT. For a long time, it was quite sufficient, but then two things happened. First, there was the iPhone revolution, bringing fluid, hardware accelerated, swipeable GUI to the general public. On the other hand, the look and feel of the UI was radically simplified in comparison to the desktop GUI of that time marking a beginning of a new kind of approach to user interaction. Then second, less known development, was the emerging of declarative UI languages in mainstream products, such as for example, XAML in Windows.

Starting with its version four, Qt reacted to these developments by providing a wholly new way of writing GUIs, by using a declarative-style, hardware-accelerated Qt Quick module, also known for its declarative notation language as...