How to set icon center in QTableView?

Question

NetworkPageForm::NetworkPageForm(QWidget *parent) :
      QWidget(parent),
      ui(new Ui::NetworkPageForm),
      devicesModel(NULL)
{
      ui->setupUi(this);
         


        

Answer 1

There is no default way. You should implement your own QStyledItemDelegate.

UPD: example added

void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    Q_ASSERT(index.isValid());

    QStyleOptionViewItemV4 opt = option;
    initStyleOption(&opt, index);
    // disable default icon
    opt.icon = QIcon();
    // draw default item
    QApplication::style()->drawControl(QStyle::CE_ItemViewItem, &opt, painter, 0);

    const QRect r = option.rect;

    // get pixmap
    QIcon icon = qvariant_cast<QIcon>(index.data(Qt::DecorationRole));
    QPixmap pix = icon.pixmap(r.size());

    // draw pixmap at center of item
    const QPoint p = QPoint((r.width() - pix.width())/2, (r.height() - pix.height())/2);
    painter->drawPixmap(r.topLeft() + p, pix);
}

Answer 2

It's no need to do it in delegate. The delegate will make your style sheet unavailable. You can paint the icon in the middle of a rectangle pixmap which is as same size as the cell, and return it in the QAbstractItemModel::data() function with Qt::DecorationRole. Like this:

Qt::DecoratoinRole:
    QPixmap pixmap(w, h);  //w=cell width, h=cell
    pixmap.fill(Qt::transparent); // draw a transparent rectangle
    QPixmap iconPixmap(":/xx.png");
    QPainter painter(&pixmap);
    //Calculate the center coordinate x,y for iconPixmap
    painter.draw(x, y, iconWidth, iconHeight, iconPixmap);
    return pixmap;