What's the difference between QMainWindow, QWidget and QDialog?

qt4 qt-creator qtwidgets
zibib picture zibib · Jul 21, 2010 · Viewed 57.5k times · Source

What's the difference between QMainWindow, QWidget and QDialog?

Answer

Caleb Huitt - cjhuitt picture Caleb Huitt - cjhuitt · Jul 21, 2010

A QWidget is the base class for all drawable classes in Qt. Any QWidget-based class can be shown as a window by showing it when it has no parent.

A QDialog is based on QWidget, but designed to be shown as a window. It will always appear in a window, and has functions to make it work well with common buttons on dialogs (accept, reject, etc.).

QMainWindow is designed around common needs for a main window to have. It has predefined places for a menu bar, a status bar, a toolbar, and other widgets. It does not have any built-in allowances for buttons like QDialog does.

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