Set grid spacing using Qt

Question

I have created a Gird with QPushButton. I would like to set each button spacing to 0. As you can see I set it, but there is still little padding around the button, and I would like to eliminate it.

QVector<QVector<QPushButton*>> buttons(10);

void MainWindow::createGrid() {
    QFrame *frame = new QFrame(this);
    QGridLayout *layout = new QGridLayout(frame);

    layout->setMargin(0);
    layout->setSpacing(0);

    for(int i = 0; i < 10; ++i){
        buttons[i].resize(10);

        for(int j = 0; j < 10; ++j){
            QPushButton *button = new QPushButton("0");
            button->setMinimumSize(50,50);
            button->setMaximumSize(50,50);

            layout->addWidget(button,i,j);

            buttons[i][j] = button;
        }
    }

    setCentralWidget(frame);  

}

Does this answer your question? [QT: Remove space between QLabel in QGridLayout](https://stackoverflow.com/questions/16388092/qt-remove-space-between-qlabel-in-qgridlayout) — talamaki, Jun 18 '21 at 11:11
layout->setContentsMargins(0,0,0,0); still not solve my problem — , Jun 18 '21 at 11:18
Are you sure the apparent space isn't actually part of the buttons themselves? What happens if you do `button->setFlat(true)` -- do you still see the space? — G.M., Jun 18 '21 at 11:21

score 0 · Accepted Answer · answered Jun 18 '21 at 21:00

Actually you already have proper settings, spacing is correct parameter for you task.

The issue here is that you QStyle (looks like you are using Windows and your default style is QWindowsVistaStyle). That style just draws QPushButton in this way, without Bevels (more info about button structure: https://doc.qt.io/qt-5/style-reference.html#push-buttons).

To ensure that it is your issue - you can setup custom style in QtDesigner and check application preview with another style:

Settings->Preferences->Forms->Print/Preview Configuration->Style

With Fusion style it will looks like this:

To set custom style from code you need to add something like this:

QApplication app(argc, argv);
app.setStyle(QStyleFactory::create("Fusion"));

Set grid spacing using Qt

1 Answers1