QSplitter implements a splitter widget. ... QSplitter  ( Orientation, QWidget * parent=0, const char * name=0 )  . ... A splitter lets the user control the size of child widgets by dragging the boundary between the children. ... Use setResizeMode () to specify that a widget should keep its size when the splitter is resized. QSplitter normally resizes the children only at the end of a resize operation, but if you call setOpaqueResize ( TRUE ), the widgets are resized as often as possible. ...