Qt - Centering a checkbox in a QTable

Question

In QtCreater I added a table to my project. in my code I am generating some data to output into the table. I want to add a QCheckbox into each row to allow the row to be selected. All the content of the table is aligned left, how do I make only these checkboxes in the first column of every row align to the center?

I'm adding the QCheckbox using:

ui->data_table->setCellWidget(rowCount,0, new QCheckBox);

Solution 1

I usually use a layout and a container widget for this. It is an ugly solution, but it works:

QWidget * w = new QWidget();
QHBoxLayout *l = new QHBoxLayout();
l->setAlignment( Qt::AlignCenter );
l->addWidget( <add your checkbox here> );
w->setLayout( l );
ui->data_table->setCellWidget(rowCount,0, w);

So basically you will have:

Table Cell -> Widget -> Layout -> Checkbox

you'll have to consider it if you will need to access the checkbox through the table.

Solution 2

Two thumbs up for Barry Mavin! You don't even have to subclass.

one line...

pCheckBox->setStyleSheet("margin-left:50%; margin-right:50%;");

done!!

Solution 3

This is an old post but in fact there is a much easier and lighter way of achieving this, just subclass QCheckBox and set the stylesheet to

margin-left:50%;
margin-right:50%;

Solution 4

It works for me, but my checkbox is not completely displayed.

To have a complete view of the widget, remove margins in layout :

l->setContentsMargins(0,0,0,0);

Solution 5

As stated in similar question around Stack Overflow, it's currently an open BUG:

https://bugreports.qt-project.org/browse/QTBUG-5368

View more solutions

Comments

[Mitch]

It seems like something that should be much easier then that. I was looking through docs for a long time trying to find a function or something that did what I wanted. But what you posted works perfectly, I would of never figured that out on my own though. Thanks!

[Spencer]

Im in PyQt4 and this only works when setting the initial value. That is, if I resize the column it does not continue to center the checkbox, it only centers it when it is first created.

[Dark King]

@SingerOfTheFall, how to get the checkstatus of the checkbox?

[drescherjm]

For some reason margin-left:50%; margin-right:50%; is giving me off-center with respect to the column heading. Any ideas.

[drescherjm]

I ended up using the first method which worked correctly without the offset.

[jpo38]

Alignment is perfect here. It's not when using stylesheet proposed by other answers (where checkbox ends up shifted to the right by some pixels).