[Development] QAbstractItemModel's meta-object got changed in QtQuick

[Ziming Song]

Hi,

I’m playing with QtQuick TreeView with custom QAbstractItemModel in C++. The program runs fine, except some error logs when program exits:


qt.core.qobject.connect: QObject::disconnect: No such signal QObject::rowsAboutToBeRemoved(QModelIndex,int,int)

qt.core.qobject.connect: QObject::disconnect: No such signal QObject::columnsAboutToBeRemoved(QModelIndex,int,int)

qt.core.qobject.connect: QObject::disconnect: No such signal QObject::rowsAboutToBeInserted(QModelIndex,int,int)

qt.core.qobject.connect: QObject::disconnect: No such signal QObject::columnsAboutToBeInserted(QModelIndex,int,int)

qt.core.qobject.connect: QObject::disconnect: No such signal QObject::rowsAboutToBeMoved(QModelIndex,int,int,QModelIndex,int)

qt.core.qobject.connect: QObject::disconnect: No such signal QObject::columnsAboutToBeMoved(QModelIndex,int,int,QModelIndex,int)

qt.core.qobject.connect: QObject::disconnect: No such signal QObject::rowsMoved(QModelIndex,int,int,QModelIndex,int)

qt.core.qobject.connect: QObject::disconnect: No such signal QObject::columnsMoved(QModelIndex,int,int,QModelIndex,int)

qt.core.qobject.connect: QObject::disconnect: No such signal QObject::layoutAboutToBeChanged(QList<QPersistentModelIndex>,QAbstractItemModel::LayoutChangeHint)

qt.core.qobject.connect: QObject::disconnect: No such signal QObject::layoutChanged(QList<QPersistentModelIndex>,QAbstractItemModel::LayoutChangeHint)

qt.core.qobject.connect: QObject::disconnect: No such signal QObject::modelReset()

This is what I found.

Error messages come from QItemSelectionModelPrivate::initModel, which is called (at least) twice, one during app start to set the model and connect some signals, one during app close to disconnect signals and set model to NULL.

At app starting, m->metaObject()->className() is correct (my custom model class name).

At app closing, m->metaObject() value changes, and m->metaObject()->className() is “QObject”, which doesn’t have those signals, thus the error message.

Can metaobject be modified during execution? If so, why?

Thanks in advance
songziming
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