[Qt-interest] QDataWidgetMapper, QSqlTableModel and AutoSubmit

[Wilhelm]

Am 11.10.2010 18:07, schrieb Wilhelm:
> Hi,
>
> I found a strange behaviuor with QDataWidgetMapper:
>
> The first time I edit a field value with the widget (QLineEdit) the
> column is mapped to, the model gets updated (e.g. the QTableView gets
> this new value). When I modifiy the field a second time, nothing happens!
>   

Update:
This works only if I add:

    connect(tv->selectionModel(),
        SIGNAL(currentRowChanged(QModelIndex,QModelIndex)),
        mapper, SLOT(setCurrentModelIndex(QModelIndex)));

> And further: if I edit the field value in the QTableView, the mapped
> widget gets not updated.
>   

Update:
This works only if I add:

    connect(tm, SIGNAL(dataChanged(QModelIndex,QModelIndex)),
        mapper, SLOT(setCurrentModelIndex(QModelIndex)));


Well, reading the docu of QDataWidgetMapper carefully, the example below
should work *without* the above
connections.

Is this by design or a bug?

> Any hints?
> -
>
> Widget::Widget(QWidget *parent)
>     : QWidget(parent) {
>
>     QVBoxLayout* l = new QVBoxLayout(this);
>
>     QTableView* tv = new QTableView(this);
>     l->addWidget(tv);
>
>     QSqlTableModel* tm = new QSqlTableModel(this);
>     tm->setEditStrategy(QSqlTableModel::OnFieldChange);
>
>     tm->setTable("vorgang");
>     tm->setHeaderData(0, Qt::Horizontal, tr("id"));
>     tm->setHeaderData(1, Qt::Horizontal, tr("Start"));
>     tm->setHeaderData(2, Qt::Horizontal, tr("End"));
>
>     if (!tm->select()) {
>         qDebug() << "select nok";
>     }
>     tv->setModel(tm);
>     tv->resizeColumnsToContents();
>     tv->setItemDelegateForColumn(1, new Delegate(this));
>
>     l->addWidget(new QLabel("Vorgang"));
>     QLineEdit* le = new QLineEdit(this);
>     l->addWidget(le);
>
>     QDataWidgetMapper* mapper = new QDataWidgetMapper(this);
>     mapper->setModel(tm);
>     mapper->addMapping(le, tm->fieldIndex("beschreibung"));
>     mapper->setSubmitPolicy(QDataWidgetMapper::AutoSubmit);
>     mapper->toFirst();
> }
>
>
>   


-- 
Wilhelm