QModelIndex Mapping in Template QWidget Class

[stefanadelbert]

I have created a template class that inherits from QWidget and aggregates a sortable QTableView and a QSortFilterProxyModel. I want to be able to react to a double click in the QTableView and pass the QModelIndex to my custom model, which has the slot void DoubleClicked(const QModelIndex&) defined on it.

This is a slimmed down version of the template class:

template<typename MODEL>
class TTableViewWidget : public QWidget
{
public:
    TTableViewWidget(MODEL& m, QWidget* parent = 0) :
	QWidget(parent),
        model(m)
    {
        sortProxy.reset(new QSortFilterProxyModel(this));
        sortProxy->setSourceModel(&model);
 
        SetupUI();
 
        connect(tableView.get(), SIGNAL(doubleClicked(const QModelIndex&)),
            &model, SLOT(DoubleClicked(const QModelIndex&)));
    }
    ~TTableViewWidget() {}
 
private:
    void SetupUI() {
        tableView.reset(new QTableView(this));
        tableView->setSortingEnabled(true);
        tableView->setModel(sortProxy.get());
 
        verticalLayout.reset(new QVBoxLayout(this));
        verticalLayout->addWidget(tableView.get());
    }
 
private:
    std::auto_ptr<QVBoxLayout> verticalLayout;
    std::auto_ptr<QTableView> tableView;
    std::auto_ptr<QSortFilterProxyModel> sortProxy;
 
private:
    MODEL& model;
 
};

template<typename MODEL>
class TTableViewWidget : public QWidget
{
public:
    TTableViewWidget(MODEL& m, QWidget* parent = 0) :
	QWidget(parent),
        model(m)
    {
        sortProxy.reset(new QSortFilterProxyModel(this));
        sortProxy->setSourceModel(&model);

        SetupUI();
        
        connect(tableView.get(), SIGNAL(doubleClicked(const QModelIndex&)),
            &model, SLOT(DoubleClicked(const QModelIndex&)));
    }
    ~TTableViewWidget() {}

private:
    void SetupUI() {
        tableView.reset(new QTableView(this));
        tableView->setSortingEnabled(true);
        tableView->setModel(sortProxy.get());

        verticalLayout.reset(new QVBoxLayout(this));
        verticalLayout->addWidget(tableView.get());
    }

private:
    std::auto_ptr<QVBoxLayout> verticalLayout;
    std::auto_ptr<QTableView> tableView;
    std::auto_ptr<QSortFilterProxyModel> sortProxy;

private:
    MODEL& model;

};

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The problem is that a QTableView::doubleClicked signal returns a QModelIndex that needs to be mapped using the QSortFilterProxyModel. Q_OBJECT does not handle template classes, so I'm not able to define signals or slots in my template class, otherwise I could simply do the mapping in a slot on the template class.

One idea I had was the subclass a QSortFilterProxyModel and provide a DoubleClicked slot that would map and call into its source model. Does anyone else have any clever ideas?

[stefanadelbert]

It seems there are answers out there. For example, http://doc.trolltech.com/qq/qq15-aca...ingtotemplates,

If the signals and slots don't require the template parameter to be part of the prototype, the workaround is to make a template class inherit a QObject subclass that provides the required signals and slots: