Описание тега qgridlayout
A QGridLayout is a class from the Qt toolkit which lays out GUI widgets in a grid.
QGridLayout takes the space made available to it by its parent layout or widget, divides it up into rows and columns, and puts each widget it manages into the correct cell.
Each column and row has a minimum width/height and a stretch factor (which determines how much of the available space the column or row will get over and above its necessary minimum). It is also possible for widgets to span multiple rows and/or columns.
The official Qt documentation can be found here.