[SOLVED] Use of QIdentityProxyModel and QTableView (Qt5.2)

SGaist

IIRC you would have to also modify mapToSource

? Offline

Hi,

Ok Thank you. Below is the code.
It works. I mean i have the "new line" displayed as the first line and the sql data displayed the other lines.
But i still have 2 problems :

The first is that when i move the mouse over the first line, the program crashes.
Instead of having the text "NEW" in the cell where it should be displayed, i have a small rectangular and the text "N...".

Would you have some suggestions to make it work ? Thank you.
By the way, would you have some working example ? It would be great.
Many thanks!

@
QModelIndex ProxyModelForTablePers::index(int row, int column, const QModelIndex &parent) const {

if (row == 0) {
    return this->createIndex(row, column);
} else
    return this->sourceModel()->index(row-1, column, parent);

}

QModelIndex ProxyModelForTablePers::mapFromSource(const QModelIndex & source) const
{
if (!sourceModel())
return QModelIndex();

if (!source.parent().isValid())
    return QModelIndex();

return index(source.row()+1, source.column());

}

QModelIndex ProxyModelForTablePers::mapToSource(const QModelIndex & proxy) const
{

if (!sourceModel())
    return QModelIndex();

if (proxy.row()==0)
    return QModelIndex();

return this->sourceModel()->index(proxy.row()-1, proxy.column());

}
@

SGaist

Did you implement the data function ? If so, how does it look like ?

? Offline

Hi,

Below is the my code :

@
ProxyModelForTablePers::ProxyModelForTablePers (QObject* parent)
: QSortFilterProxyModel (parent) {

}

int ProxyModelForTablePers::rowCount(const QModelIndex &parent) const {
return (this->sourceModel()->rowCount()+1);
}

QVariant ProxyModelForTablePers::data(const QModelIndex &proxyIndex, int role) const {

if (!proxyIndex.isValid())
    return QVariant ();

if (proxyIndex.row() == 0) {

    if (proxyIndex.column()==1)
        return QVariant ("new");
    else
        return QVariant("test");
} else
    return QSortFilterProxyModel::data(proxyIndex, role);
    //return this->sourceModel()->data(this->mapToSource(proxyIndex), role);

}

bool ProxyModelForTablePers::setData(const QModelIndex &index, const QVariant &value, int role) {

if (index.row() == 0) {
    return false;
}
else
    return this->sourceModel()->setData (index, value, role);

}

Qt::ItemFlags ProxyModelForTablePers::flags(const QModelIndex &index) const {

Qt::ItemFlags flags = QSortFilterProxyModel::flags(index);
flags |= Qt::ItemIsEditable;
return flags;

}

QModelIndex ProxyModelForTablePers::index(int row, int column, const QModelIndex &parent) const {

if (row == 0) {
    return this->createIndex(row, column);
} else
    return this->sourceModel()->index(row-1, column, parent);

}

QModelIndex ProxyModelForTablePers::mapFromSource(const QModelIndex & source) const
{
if (!sourceModel())
return QModelIndex();

if (!source.parent().isValid())
    return QModelIndex();

return index(source.row()+1, source.column());

}

QModelIndex ProxyModelForTablePers::mapToSource(const QModelIndex & proxy) const
{

if (!sourceModel())
    return QModelIndex();

if (proxy.row()==0)
    return QModelIndex();

return this->sourceModel()->index(proxy.row()-1, proxy.column());

}

TableViewPers::TableViewPers (QWidget *parent)
: QTableView (parent)
{

this->setEditTriggers(QAbstractItemView::AllEditTriggers);
this->setSortingEnabled(true);
this->setSelectionBehavior(QAbstractItemView::SelectRows);
this->setSelectionMode(QAbstractItemView::ContiguousSelection);

_SourceModel = new QSqlTableModel (this, DataBaseManager::getManager()->getDataBase());

FillSourceModelViewPers();

ProxyModelForTablePers * lProxy = new ProxyModelForTablePers (this);
lProxy->setSourceModel(_SourceModel);

this->setModel(lProxy);

this->setColumnHidden(0, true);
this->resizeColumnsToContents();

}

@

SGaist

You don't check what role you are given so basically you are giving "test" and "new" for every role whether it asks for DisplayRole or DecorationRole etc...

? Offline

Hi, thanks for your help !
You are perfectly right! It is well displayed now !

But i still have the crash problem when the mouse is over the first line. ..Like a onmouseOver event ? Have you got any clue about it ?

@
QVariant ProxyModelForTablePers::data(const QModelIndex &proxyIndex, int role) const {

qDebug()<<proxyIndex.row()<<" "<<proxyIndex.column()<<" "<<rowCount();

if (role != Qt::DisplayRole)
        return QVariant();

if (!proxyIndex.isValid())
    return QVariant ();

if (proxyIndex.row() == 0) {
            if (proxyIndex.column()==1)
                return QVariant ("new");
            else
                return QVariant("test");

} else
    //return QSortFilterProxyModel::data(proxyIndex, role);
    return this->sourceModel()->data(this->mapToSource(proxyIndex), role);

}
@

SGaist

You should run your program using the debugger, from your proxy code here the only thing that could happen is that you don't have a source model which shouldn't happen since you are setting it in the constructor of TableViewPers

? Offline

Hi,

I don't understand. Maybe that is a Qt bug ?
In debug mode, this are the last calls before crash :
QSortFilterProxyModel::parent
QTableView::visualRect
QAbstractItenView::viewportEvent

I removed the wrong line from mapFromSource
if (!source.parent().isValid())
return QModelIndex();

But i still have the problem. Any idea ? Thanks

SGaist

First thing to do is correct the data function to return proper values (or default) for each role

? Offline

Hi,

It was simply to implement the parent method...
Thanks

SGaist

Of course ! I forgot about that one… Sorry