QTableView has a corner button, occupying the intersection between the horizontal and the vertical header. Clicking this will select all cells in the table. What I\'m wonder
You can add text on the corner button by finding a child from QTableWidget and add a QLabel to it by using the vertical layout as below.
QAbstractButton* button = qFindChild< QAbstractButton* >(TableWidget);
if (button)
{
QVBoxLayout* lay = new QVBoxLayout(button);
lay->setContentsMargins(0, 0, 0, 0);
QLabel* label = new QLabel("No");
label->setStyleSheet("QLabel {font-face: ArialMT; font-size: 10px; color: #FFFFFF; font-weight: bold; }""QToolTip { color: #ffffff; background-color: #000000; border: 1px #000000; }");
label->setAlignment(Qt::AlignCenter);
label->setToolTip("Text");
label->setContentsMargins(2, 2, 2, 2);
lay->addWidget(label);
}