Qt - How to control the widget sizes in QLayout

Question

I am trying to put some spinboxes,line edits in a layout. But the size extends more than the neccesity. Below is the figure

Answer 1

It's easy. It can be done by giving the stretching factor. That means you have to initiate the value when you use the functions

addWidget(widget,stretchfactor);
       or
addLayout(layout,stretchfactor);