How to set widgets as children items on QTreeView

[q130s]

Is it possible to add widgets to the children items on QTreeView?

Thanks to [this thread on stackoverflow](http://stackoverflow.com/questions/9...setindexwidget), I'm able to add widgets to 2nd or later column of `QAbstractItemView` (in my example QTreeView of top level items of a view.

Here's what I've tried which partly went well:

#!/usr/bin/env python
    import os
 
    from PyQt4.QtCore import QModelIndex, Qt
    from PyQt4.QtGui import QApplication, QItemSelectionModel, \
                            QPushButton, QStandardItem, \
                            QStandardItemModel, QTreeView
    from PyQt4.uic import loadUi
 
 
    class PrvTreeviewNest(QTreeView):
        def __init__(self):
            super(PrvTreeviewNest, self).__init__()
 
            loadUi('/home/user/yourproject/resource/treeview_nest.ui')
 
            # row can be 0 even when it's more than 0.
            self._datamodel = QStandardItemModel(0, 2)
            self.setModel(self._datamodel)
 
            for i in range(4):
                self._add_widget(i + 1)
 
            self.show()
 
        def _add_widget(self, n):
            std_item = QStandardItem('{}th item'.format(n))
            self._datamodel.setItem(n, 0, std_item)
 
            node_widget = QPushButton('{}th button'.format(n))
            qindex_widget = self._datamodel.index(n, 1, QModelIndex())
            self.setIndexWidget(qindex_widget, node_widget)
 
            if n == 2:
                std_item_child = QStandardItem('child')
                std_item.appendRow(std_item_child)
 
                node_widget_child = QPushButton('petit button')
                qindex_widget_child = self._datamodel.index(n, 1, QModelIndex())
                self.setIndexWidget(qindex_widget_child, node_widget_child)
 
    if __name__ == '__main__':
        import sys
        app = QApplication(sys.argv)
        window = PrvTreeviewNest()
        window.resize(320, 240)
        window.setWindowTitle(
             QApplication.translate("toplevel", "Top-level widget"))
 
        sys.exit(app.exec_())

#!/usr/bin/env python
    import os
    
    from PyQt4.QtCore import QModelIndex, Qt
    from PyQt4.QtGui import QApplication, QItemSelectionModel, \
                            QPushButton, QStandardItem, \
                            QStandardItemModel, QTreeView
    from PyQt4.uic import loadUi
    
    
    class PrvTreeviewNest(QTreeView):
        def __init__(self):
            super(PrvTreeviewNest, self).__init__()
    
            loadUi('/home/user/yourproject/resource/treeview_nest.ui')
    
            # row can be 0 even when it's more than 0.
            self._datamodel = QStandardItemModel(0, 2)
            self.setModel(self._datamodel)
    
            for i in range(4):
                self._add_widget(i + 1)
    
            self.show()
    
        def _add_widget(self, n):
            std_item = QStandardItem('{}th item'.format(n))
            self._datamodel.setItem(n, 0, std_item)
    
            node_widget = QPushButton('{}th button'.format(n))
            qindex_widget = self._datamodel.index(n, 1, QModelIndex())
            self.setIndexWidget(qindex_widget, node_widget)
    
            if n == 2:
                std_item_child = QStandardItem('child')
                std_item.appendRow(std_item_child)
    
                node_widget_child = QPushButton('petit button')
                qindex_widget_child = self._datamodel.index(n, 1, QModelIndex())
                self.setIndexWidget(qindex_widget_child, node_widget_child)
    
    if __name__ == '__main__':
        import sys
        app = QApplication(sys.argv)
        window = PrvTreeviewNest()
        window.resize(320, 240)
        window.setWindowTitle(
             QApplication.translate("toplevel", "Top-level widget"))
    
        sys.exit(app.exec_())

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[treeview_nest.ui](http://pastebin.com/G0DhQay3) is available.

You see in the image below that the item `child` doesn't show a button and its parent's button is overwritten. Apparently I have no idea how to write a code for it.
TPsZ9.png