I have a QTreeview with 2 columns. One column there is supposed to be a pixmap and the other column has pixmap and icon. The column with just the pixmap does not show anything.

[Tater]

I have a pixmapList that holds my visibility icons. I am trying to add the visibility icon just for column = 1. Everything populates correctly for column=0

    this->VisiblePixmapList = new QPixmap[(int)(VisibleIconType::LAST) + 1];
    this->VisiblePixmapList[(int)VisibleIconType::EYEBALL].load(":/images/Eyeball.png");
    this->VisiblePixmapList[(int)VisibleIconType::EYEBALL_GRAY].load(":/images/EyeballClosed.png");

    QPixmap emptyPixmap(16,16);
    emptyPixmap.fill();
    this->VisiblePixmapList[(int)VisibleIconType::LAST] = emptyPixmap;

QVariant function::data(const QModelIndex& idx, int role) const
{
    if (!idx.isValid() || idx.model() != this)
    {
        return QVariant();
    }
    auto item = reinterpret_cast<functionItem*>(idx.internalPointer());

    auto source = item->Node;
    switch (role)
    {
    case Qt::ToolTipRole:
        if (source)
        {
            return QVariant(source->getToolTips().c_str());
        }

        // THE BELOW DOES NOT WORK LIKE I INTEND
    case Qt::DisplayRole:
        if (idx.column() == 1)
        {
            auto test = this->VisiblePixmapList[(int)item->VisibilityIcon];
            auto testSize = test.size();
            auto test2 = test.scaled(QSize(32,32));
            return QVariant(test2);
        }

    case Qt::EditRole:
        if (idx.column() == 0)
        {
            if (source)
            {
                return QVariant(source->getName().c_str());
            }
            else
            {
                qDebug() << "Cannot decide type.";
            }
        }
        break;

    case Qt::DecorationRole:
        if (idx.column() == 0 && this->PixmapList)
        {
            if (item && item->getType() != function::Invalid)
            {
                auto scaledPixMap = this->PixmapList[(int)item->getIconType()].scaled(QSize(32,32));
                return QVariant(scaledPixMap);
            }
        }
        break;
    }
    return QVariant();
}

[JonB]

@Tater

• Start by demonstrating what value this->VisiblePixmapList[(int)item->VisibilityIcon] has. It's probably correct, but we/you don't know that for sure till you print it out.

• Use break statements correctly and consistently in your switch statement.

• You are returning a QPixmap for DisplayRole. Where does Qt say you can do that? DisplayRole has to resolve to a string, https://doc.qt.io/qt-6/qt.html#ItemDataRole-enum

Qt::DisplayRole 0 The key data to be rendered in the form of text. (QString)

QPixmap does not, so probably comes out empty. I have not tried it, but from that page don't you want:

Qt::DecorationRole 1 The data to be rendered as a decoration in the form of an icon. (QColor, QIcon or QPixmap)

?