These classes provide automatic geometry (layout) management of widgets.
| Q3Grid | Simple geometry management of its children |
| Q3HBox | Horizontal geometry management for its child widgets |
| Q3VBox | Vertical geometry management of its child widgets |
| QBoxLayout | Lines up child widgets horizontally or vertically |
| QButtonGroup | Container to organize groups of button widgets |
| QGridLayout | Lays out widgets in a grid |
| QGroupBox | Group box frame with a title |
| QHBoxLayout | Lines up widgets horizontally |
| QLayout | The base class of geometry managers |
| QLayoutItem | Abstract item that a QLayout manipulates |
| QSizePolicy | Layout attribute describing horizontal and vertical resizing policy |
| QSpacerItem | Blank space in a layout |
| QStackedLayout | Stack of widgets where only one widget is visible at a time |
| QStackedWidget | Stack of widgets where only one widget is visible at a time |
| QVBoxLayout | Lines up widgets vertically |
| QWidgetItem | Layout item that represents a widget |
