QLayout

QLayout is a layout management class in the Qt application framework. It is used to manage the size and position of child widgets in a layout area. QLayout is a base class for several layout classes, including QHBoxLayout, QVBoxLayout, QGridLayout, and others.

QLayout provides several methods for adding and removing widgets from the layout, as well as controls for spacing and alignment. The layout's geometry and widget positions can be adjusted at runtime, allowing for dynamic resizing and reorganization of the user interface. QLayout also supports signals and slots, which can be used to connect widget interactions to other parts of the application.

QLayout has several key features that make it a useful tool for Qt developers. It is highly customizable, allowing developers to create tailored layouts that meet specific application requirements. QLayout also supports stacking policies, which determine how widgets are added or removed from the layout.

QLayout has several subclass classes that provide more specific layout management capabilities. For example, QHBoxLayout arranges widgets horizontally, while QVBoxLayout arranges them vertically. QGridLayout arranges widgets in a table-like structure. These subclasses add dynamic positioning, structure and repetition functionality, allowing developers to create complex user interfaces with relative ease.

QLayout is widely used in Qt applications, and is seen as a core part of the Qt Framwork. It has been maintained and developed by the Qt Project since the project's inception in the 1990s.