QT4 designer doesnot accept ‘&’ reference and ‘ ‘ space character in signal/slot editor

I hate to be the bearer of bad news, but I can't think of any easy way to do what you want. I can think of a couple of options, each more painful than the last:

• You could create a delegate that always shows the editors, and when the user changes the selected row, set that delegate for the newly selected row, and the original delegate for the deselected row.
• You could try inheriting from the table view, and overriding the behavior for drawing the appropriate items for everything in the given row. I have no idea how hard this would be, but I doubt it would be trivial.
• You could create your own view to display the model. I've never done this, and I'd hate to think about all that would be required to "complete" support the models. However, to match with one specific model, you might be able to get away with it.

This has been fixed as of Qt 4.8.0:

https://bugreports.qt.io/browse/QTBUG-10637

Suppose we have a QObject* m_subject, and wish to connect the change-notification signal of a property to a propertyChanged() slot:

const QMetaObject* meta = m_subject->metaObject();
QMetaProperty prop = meta->property(meta->indexOfProperty("myProperty"));
if (prop.hasNotifySignal()) {
    QMetaMethod signal = prop.notifySignal();
    QMetaMethod updateSlot = metaObject()->method(
        metaObject()->indexOfSlot("propertyChanged()"));
    connect(m_subject, signal, this, updateSlot);
}

I successfully used this to make a QWidget subclass which finds all the properties of any QObject and creates a QLineEdit for each of them, with a connection to keep the QLineEdit updated whenever the corresponding property changes. (Because I didn't find a way to pass a propertyID value to propertyChanged() though, it was necessary to make a subclass of QLineEdit and implement propertyChanged() there. QSignalMapper didn't help, because all the properties are in the same object.)