QTableView: add delete button to each row

[galrub]

Hello all,
I have a QTableView with QSqlRelationalTableModel as a model, I'm trying to add a button with a minus sign at the end of each row (a column of minus...), this button will delete the specific row and refresh the table.

Any ideas?
Thanks,
G

[andre]

Two approaches:

Create a proxy model that adds a column in which you show a small image depicting the - sign button

Create a custom delegate for your last column that draws this button.

I think I would go with option 1, as that is a bit easier to do I think. Drawing code is always tricky to get right.

[galrub]

1st option sounds good enough, but how do I create such a proxy model... also, as far as option two, I'm trying to understand how to implement the QItemDelegate ::paint() so, what I have now is:
@
/header portion/
class RemoveRowButoonItemDelegate : public QItemDelegate {
Q_OBJECT

public:
RemoveRowButoonItemDelegate(QObject *parent = 0);

RemoveRowButoonItemDelegate(QString & iconResourceId, QObject *parent = 0);

QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
                    const QModelIndex &index) const;

void setEditorData(QWidget *editor, const QModelIndex &index) const;
void setModelData(QWidget *editor, QAbstractItemModel *model,
                const QModelIndex &index) const;

void updateEditorGeometry(QWidget *editor,
    const QStyleOptionViewItem &option, const QModelIndex &index) const;

void paint(QPainter *painter, const QStyleOptionViewItem &option,
const QModelIndex &index) const;

public slots:
void removeRow();
private:
QString _iconResourceId;
QToolButton * btn;

/*implementation portion */

RemoveRowButoonItemDelegate::RemoveRowButoonItemDelegate(QObject *parent) : QItemDelegate(parent){
_iconResourceId = ":/myApp/IDB_MINUS";
btn = new QToolButton(parent);
QIcon icon;
icon.addFile(_iconResourceId, QSize(), QIcon::Normal, QIcon::Off);
btn->setIcon(icon);
connect(btn, SIGNAL(clicked()), this, SLOT(removeRow()));
}

RemoveRowButoonItemDelegate::RemoveRowButoonItemDelegate(QString & _icon,QObject *parent) : QItemDelegate(parent), _iconResourceId(_icon){
btn = new QToolButton(parent);
QIcon icon;
icon.addFile(_iconResourceId, QSize(), QIcon::Normal, QIcon::Off);
btn->setIcon(icon);
connect(btn, SIGNAL(clicked()), this, SLOT(removeRow()));
}

QWidget *RemoveRowButoonItemDelegate::createEditor(QWidget *parent,
const QStyleOptionViewItem & options,
const QModelIndex &index) const {
return btn;
}

void RemoveRowButoonItemDelegate::setEditorData(QWidget *editor,
const QModelIndex &index) const {
}

void RemoveRowButoonItemDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
const QModelIndex &index) const {
}

void RemoveRowButoonItemDelegate::updateEditorGeometry(QWidget editor,
const QStyleOptionViewItem &option, const QModelIndex &/ index */) const {
editor->setGeometry(option.rect);
}

void RemoveRowButoonItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
const QModelIndex &index) const {
if (option.state & QStyle::State_Selected)
painter->fillRect(option.rect, option.palette.highlight());
//?... how do I put btn inside the cell?
}
@
I will add the filterEvent portion later, it will return false in all signals so, no editing will be allowed.

so, how do I paint the button inside the rec of the cell?

Thanks,
G