<![CDATA[How to override QAbstractItemModel::parent() in QSortFilterProxyModel?]]>I want the QAbstractItemModel::parent() function to return different ancestors at will and the tree structure to change accordingly. To do this, I redefine parent() in QSortFilterProxyModel, but this does not give the desired effect. Is there any working way to override QAbstractItemModel::parent()?

]]>https://forum.qt.io/topic/142147/how-to-override-qabstractitemmodel-parent-in-qsortfilterproxymodelRSS for NodeFri, 10 Apr 2026 00:07:01 GMTThu, 12 Jan 2023 08:53:07 GMT60<![CDATA[Reply to How to override QAbstractItemModel::parent() in QSortFilterProxyModel? on Fri, 13 Jan 2023 07:23:29 GMT]]>Thanks for the answer, I'll try it and say what happened.

]]>https://forum.qt.io/post/743693https://forum.qt.io/post/743693Fri, 13 Jan 2023 07:23:29 GMT<![CDATA[Reply to How to override QAbstractItemModel::parent() in QSortFilterProxyModel? on Fri, 13 Jan 2023 03:53:30 GMT]]>@Ilya-Andreev said in How to override QAbstractItemModel::parent() in QSortFilterProxyModel?:

I want the QAbstractItemModel::parent() function to return different ancestors at will and the tree structure to change accordingly. To do this, I redefine parent() in QSortFilterProxyModel, but this does not give the desired effect. Is there any working way to override QAbstractItemModel::parent()?

How is the view supposed to know that it needs to check the parent() of a particular item again?

The intended path to implement this is via QAbstractItemModel::beginMoveRows and QAbstractItemMode::endMoveRows, or emit the signals mentioned in the first link directly. If the change is complicated enough, use QAbstractItemModel::beginResetModel and QAbstractItemModel::endResetModel.

]]>https://forum.qt.io/post/743672https://forum.qt.io/post/743672Fri, 13 Jan 2023 03:53:30 GMT<![CDATA[Reply to How to override QAbstractItemModel::parent() in QSortFilterProxyModel? on Thu, 12 Jan 2023 13:22:22 GMT]]>@JonB Unfortunately, overriding this function has no effect on the tree structure. Perhaps there is another way to redefine the parent without changing the original elements.

]]>https://forum.qt.io/post/743595https://forum.qt.io/post/743595Thu, 12 Jan 2023 13:22:22 GMT<![CDATA[Reply to How to override QAbstractItemModel::parent() in QSortFilterProxyModel? on Thu, 12 Jan 2023 13:16:26 GMT]]>@Ilya-Andreev said in How to override QAbstractItemModel::parent() in QSortFilterProxyModel?:

QModelIndex QAbstractItemModel::parent(const QModelIndex &index) const

Well since that is virtual you can in principle override the override in QSortFilterProxyModel by sub-classing that. Whether it will behave as you desire/safely I do not know.

]]>https://forum.qt.io/post/743594https://forum.qt.io/post/743594Thu, 12 Jan 2023 13:16:26 GMT<![CDATA[Reply to How to override QAbstractItemModel::parent() in QSortFilterProxyModel? on Thu, 12 Jan 2023 10:48:33 GMT]]>I think I need to clarify: I want to redefine the

QModelIndex QAbstractItemModel::parent(const QModelIndex &index) const

not

QObject *  QAbstractItemModel::parent()
]]>https://forum.qt.io/post/743570https://forum.qt.io/post/743570Thu, 12 Jan 2023 10:48:33 GMT<![CDATA[Reply to How to override QAbstractItemModel::parent() in QSortFilterProxyModel? on Thu, 12 Jan 2023 09:42:18 GMT]]>@Ilya-Andreev I don't understand your use case. A QObject based object can only have ONE parent, returning arbitrary object as parent which is not actual parent will not change the parent/child relationship.

]]>https://forum.qt.io/post/743565https://forum.qt.io/post/743565Thu, 12 Jan 2023 09:42:18 GMT