setWindowFlagQtWindowStaysOnTopHint

SetWindowFlag is a Qt class that provides a way to set flags on windows in Qt applications. These flags can be used to override the default behavior of windows in Qt, such as whether a window should be visible by default or whether it should be resizable.

The class provides several functions to set and unset flags using bitwise operations. The most commonly used function is setWindowFlag, which takes a WindowType and a boolean value as arguments and sets or clears the corresponding flag on the window. The WindowType is an enumeration class that specifies which flag is being set. For example, Qt::WindowSystemMenuHint sets the flag to include the system menu in the window's title bar.

Other functions provided by the class include unsetWindowFlag, which clears a flag, and testFlag, which returns the state of a flag on a window. These functions can be used to check and modify the state of a window's flags without having to use a separate boolean value to store that state.

SetWindowFlag is often used in conjunction with other Qt classes, such as QWidget and QCoreApplication, to create windows that exhibit non-standard behavior. For example, an application might use setWindowFlag to make a window stay on top of others in the windowing system.

Qt's setWindowFlag class is a fundamental part of creating custom window behaviors in Qt applications, and is commonly used in a wide range of applications, from desktop software to mobile device apps.