QHBoxLayout *layout = new QHBoxLayout; layout->setContentsMargins(10, 10, 10, 10);
QGridLayout *layout = new QGridLayout; layout->setContentsMargins(20, 30, 20, 30);In the above example, a QGridLayout is created and its outer margins are set to 20 pixels on the left and right sides, and 30 pixels on the top and bottom. Package/Library - The QLayout setContentsMargins method is part of the Qt GUI library, which is a cross-platform application development framework used for creating graphical user interfaces in C++.