Qt - What is a QWidget?

Question

In the book C++ GUI Programming with Qt 4, the example in the first chapter mentions what QWidgetserves as the main application window.

And on Qt Reference Documentation: http://doc.qt.io/qt-4.8/qwidget.html there is a lot of information about QWidget.

But what is the baseline? What does QWidget basically do? When should I think about it?

Answer 1

One way to think about it - any object that knows how to display itself on the screen is a QWidget (in particular, some subclass of QWidget).

, QPicture, , QPicture , . QLabel (, QWidget).

Answer 2

. / , Qt, QWidget.

, , .

Answer 3

- X11 - , . , , ..

, , Window Gadget.

Answer 4

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