Hide children of QStandardItem in QTreeView

I feel like I'm missing something really obvious, but is it possible to disable expansion of a particular QStandardItem within a QTreeView when it has children? My model has 4 root items uniquely subclassed from QStandardItem, each with a set of children of unknown quantity, but I only want two of them to actually show their children. Is this possible?

I think QTreeWidgetItem::ChildIndicatorPolicy is a convenience function that does something like this, but I can't see anything similar in QStandardItem. Where in QStandardItem's implementation does it control the display of its children?

In case it's relevant, I'm displaying them in a QTreeView.

if you have your own implementation of QAbstractItemModel or QStandardItemModel for your QTreeView you can return 0 from rowCount() for particular items
or override function hasChildren () and returm false for particular items

That is exactly what I was looking for! Thank you.

Here's my code:

Code:

---

//myitemmodel.h
class MyItemModel : public QStandardItemModel
{
	Q_OBJECT
public:
	explicit MyItemModel(QObject *parent = 0);
	explicit MyItemModel(int rows, int columns, QObject* parent = 0);
 
	virtual int rowCount(const QModelIndex &parent = QModelIndex()) const;
	virtual bool hasChildren(const QModelIndex &parent) const;
};
 
//myitemmodel.cpp
#include "myitem.h"
MyItemModel::MyItemModel(QObject *parent) :
    QStandardItemModel(parent)
{}
 
MyItemModel::MyItemModel(int rows, int columns, QObject *parent) :
	QStandardItemModel(rows, columns, parent)
{}
 
bool MyItemModel::hasChildren(const QModelIndex &parent) const
{
	if(itemFromIndex(parent) != 0)
	{
		switch(itemFromIndex(parent)->type())
		{
			case MyItem::CUSTOMTYPE1:		//QStandardItem::UserType +1
			case MyItem::CUSTOMTYPE3:		//QStandardItem::UserType +3
			case MyItem::CUSTOMTYPE4:		//QStandardItem::UserType +4
				/* force children to be hidden, no matter the view type */
				return false;
 
			case MyItem::CUSTOMTYPE2:		//QStandardItem::UserType +2
			default:
				/* proceed normally */
				break;
		}
	}
	return QStandardItemModel::hasChildren(parent);
}
 
int SessionItemModel::rowCount(const QModelIndex &parent) const
{
	if(itemFromIndex(parent) != 0)
	{
		switch(itemFromIndex(parent)->type())
		{
			case MyItem::CUSTOMTYPE1:		//QStandardItem::UserType +1
			case MyItem::CUSTOMTYPE3:		//QStandardItem::UserType +3
			case MyItem::CUSTOMTYPE4:		//QStandardItem::UserType +4
				/* force children to be hidden, no matter the view type */
				return 0;
 
			case MyItem::CUSTOMTYPE2:		//QStandardItem::UserType +2
			default:
				/* proceed normally */
				break;
		}
	}
	return QStandardItemModel::rowCount(parent);
}

---

This had the desired effect of particular item types appearing as if they had no children in my QTreeView. Note that only overriding QStandardItemModel::rowCount() made it so that the expansion button still appeared in the QTreeView even though its children were hidden, so I had to override QStandardItemModel::hasChildren(), too. It seems that overriding rowCount is optional in my case, but I did it anyway to be safe.