Cell padding problem while centering a checkbox in QTableWidget

[Binary91]

Hello,

I try to add checkboxes to every cell of my QTableWidget, like this:

int main(int argc, char** args)
{
  FreeConsole();
  QApplication app(argc, args);
  QWidget window;

  QVBoxLayout layout(&window);
     
  QTableWidget table_main;
  table_main.setStyleSheet("QTableWidget::item { padding: 0px }");    // <--- not solving the problem
  table_main.setColumnCount(9);
  table_main.setRowCount(10);
  QStringList table_main_headers_h;
  table_main_headers_h << "Amount" << "Person 1" << "Person 2" << "Person 3" << "Person 4" << "Person 5";
  table_main.setHorizontalHeaderLabels(table_main_headers_h);

  for(int i = 0;i < table_main.rowCount(); i++)
  {
    for(int ii = 1; ii < table_main.columnCount(); ii++)
    {
      QWidget *table_main_cell_widget = new QWidget();
      table_main_cell_widget->setContentsMargins(0,0,0,0);    // <--- also not solving the problem
      QHBoxLayout *table_main_cell_layout = new QHBoxLayout(table_main_cell_widget);
      table_main_cell_layout->setAlignment(Qt::AlignCenter);

      QCheckBox *table_main_cb = new QCheckBox();
      table_main_cell_layout->addWidget(table_main_cb);
      table_main_cell_widget->setLayout(table_main_cell_layout);    // <--- second Question: why do I need this command? There is no change if I don't use it...
      table_main.setCellWidget(i, ii, table_main_cell_widget);
    }
  }

  layout.addWidget(&table_main);

  window.setWindowTitle("Calculator");
  window.showMaximized();
  app.exec();

 return 0;
}

The problem is that the checkboxes are not fully displayed (left & right border are shown, but top and bottom border are missing). When I manually change the vertical cell size with mouse, then the top and bottom borders of the checkboxes in this row appear...

How can I manage it that my widgets inside the table cells are also vertically shown in full size?

[KidTrent]

Ran into the same issue, and figured I'd post a reply since there was 1.1k views and not a single answer...

The reason is due to the layout margins,. So in this users case, using the following would solve the problem:

table_main_cell_layout->setMargins(0);

[Christian Ehrlicher]

@KidTrent said in Cell padding problem while centering a checkbox in QTableWidget:

views and not a single answer...

Because it was answered already a lot of times elsewhere - Qt does not support it out of the box and the best is to use a custom item delegate and paint it by yourself.