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

Here I am adding a QScrollArea widget,and a QVBoxLayout into a QHBoxLayout. Then I am adding the line edits,spin boxes into the QVBoxLayout. But I want to reduce the width as 2/10 of the total width. Can anybody help me in this?

Solution 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);

Solution 2

In my opinion, working with stretch factors is not the right solution, here. It's a bit "hackish". Stretch factors are useful e.g. when you have two widgets that both use as much space as possible, but not at a 50:50 rate.

Here, as I see it, you have two widgets (or groups of widgets), where one should only use as much space as it really needs and the other one should take the rest. That is what size policies are for. Set the horizontal policy of the left one to Expanding (or MinimumExpanding if you want to prevent scroll bars) and the right one to Preferred.

Comments

[prabhakaran]

The above picture is not a maximized one, that is it's default size. And I want the widgets should be maximized, when the main widget is maximized . Also The layout's should keep the ratio.

[Sebastian Negraszus]

In my opinion, this is not the best approach. Take a look at my answer.

[prabhakaran]

widget only having setSizePolicy. I couldn't find the same for QVBoxLayout

[Sebastian Negraszus]

You can put widgets into another QWidget or QGroupBox

[Alph0r]

You can also use the setStretch() method of the layout after you added the widgets.