As is often the case in Qt, there are objects that are not QObjects, but that are managed by a QObject (or otherwise accessible via one). You need to make MyObject
monitor the model the items are in. The code below could be a starting point.
Another approach, not implemented but certainly feasible, is to dynamically replace all items in a model with copies that are instances that you yourself created. By monitoring the relevant model signals, you can be notified of all item additions and replace items with instances that you are a factory for. It would be a thinly veiled dependency injection into a QStandardItemModel
.
The lowest-overhead approach would be to move the signals and slots from individual objects to the model itself, so that you avoid the overhead of having potentially very many QObjects, while still retaining their signal/slot functionality.
class MyObject : public QObject {
Q_OBJECT
QStandardItem * m_item;
Q_SLOT void onRowsAboutToBeRemoved(const QModelIndex & parent, int start, int end) {
if (m_item->parent() == parent &&
m_item->index().row() >= start &&
m_item->index().row() <= end) onItemGone;
}
Q_SLOT void onColumnsAboutToBeRemoved(const QModelIndex & parent, int start, int end) {
if (m_item->parent() == parent &&
m_item->index().column() >= start &&
m_item->index().column() <= end) onItemGone;
}
Q_SLOT void onItemGone() {
m_item = 0;
deleteLater();
}
public:
MyObject(QStandardItem* item, QObject * parent = 0) :
QObject(parent), m_item(item)
{
Q_ASSERT(m_item.model());
connect(m_item.model(), SIGNAL(rowsAboutToBeRemoved(QModelIndex,int,int)),
SLOT(onRowsAboutToBeRemoved(QModelIndex,int,int)));
connect(m_item.model(), SIGNAL(columnsAboutToBeRemoved(QModelIndex,int,int)),
SLOT(onColumnsAboutToBeRemoved(QModelIndex,int,int)));
connect(m_item.model(), SIGNAL(modelAboutToBeReset()), SLOT(onItemGone());
connect(m_item.model(), SIGNAL(destroyed()), SLOT(onItemGone());
}
};