How to connect Signal / Slot with inheritence

Infinity

I created a custom QSqlTableModel class. It looks like this:

mysqltablemodelreadonly.h

#include <QObject>
#include <QDebug>
#include <QItemSelection>
#include <QSqlTableModel>

class MySqlTableModelReadOnly : public QSqlTableModel
{
    Q_OBJECT

public:
    explicit MySqlTableModelReadOnly(const QString table, QObject *parent = nullptr);

    void setSelection(const QItemSelection selection);

private:
    QItemSelection m_selection;

signals:
    void selectionChanged();
};

mysqltablemodelreadonly.cpp

MySqlTableModelReadOnly::MySqlTableModelReadOnly(const QString table, QObject *parent) : QSqlTableModel(parent)
{
    this->setTable(table);
}

void MySqlTableModelReadOnly::setSelection(const QItemSelection selection)
{
    // This selection is set by the view
    m_selection = selection;

    emit this->selectionChanged();
}

I created two classes which inherit MySqlTableModelReadOnly:

MySqlModelProfile::MySqlModelProfile(QObject *parent) : MySqlTableModelReadOnly("profile", parent)
{
    connect(this, &MySqlModelProfile::selectionChanged,
            this, &MySqlModelProfile::on_profileSelectionChanged);
}

and:

MySqlModelAccount::MySqlModelAccount(QObject *parent) : MySqlTableModelReadOnly("account", parent)
{
    connect(this, &MySqlModelAccount::selectionChanged,
            this, &MySqlModelAccount::on_accountSelectionChanged);
}

When MySqlTableModelReadOnly::selectionChanged() is emitted both classes which inherit MySqlTableModelReadOnly catch the signal on_selectionChanged.

How do I have to connect the slots, that just the child class receives the signal?

Christian Ehrlicher

@Infinity said in How to connect Singal / Slot with inheritence:

How do I have to connect the slots, that just the child class receives the signal?

Use another slot.

Infinity

@Christian-Ehrlicher What do you mean with "use another slot"? I already have two different slots.

Christian Ehrlicher

Then disconnect the other one.
But on the other side - your design is flawed - why don't you want that your base class does it's work?

Infinity

@Christian-Ehrlicher said in How to connect Signal / Slot with inheritence:

But on the other side - your design is flawed - why don't you want that your base class does it's work?

How should I do this? I don't have much experience with this.

Christian Ehrlicher

@Infinity said in How to connect Signal / Slot with inheritence:

How should I do this?

See QObject::disconnect()

Infinity

@Christian-Ehrlicher Thank you very much. That solved my issue.