QWidget* widget = new QWidget(parent); QSizePolicy sizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding); widget->setSizePolicy(sizePolicy);
QWidget* widget = new QWidget(parent); QSizePolicy sizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding); widget->setSizePolicy(sizePolicy);In this example, we create a new QWidget and set its size policy to Fixed in the horizontal direction and Expanding in the vertical direction. This means that the widget will maintain a fixed width and expand or shrink vertically to fill the available space. Package library: This method is part of the Qt framework, which is a C++ cross-platform development framework. The Qt framework includes a rich set of libraries and tools for creating GUI applications, network applications, embedded systems, and more.