ParameterTree hiding nested groups

[WodkaRHR]

Hello together,

I currently am desining a ParameterTree with nested GroupParameters. So far so good. One group (I will call it group_a) has n+1 children:

• index : A parameter that can take int values
• n times another GroupParameter, where each of these GroupParameters represents a different "index".

What I want to do: Only show the one of the n subgroups, which index matches the value of the 'index' subparameter. That is, whenever I change the value of the 'index' parameter in group_a, I want to:

1. hide all n GroupParameters in group_a
2. show the one of the n GroupParameters that matches the value of the 'index' parameter of group_a

What I implemented so far works kind of:

import os

import pyqtgraph.parametertree.ParameterTree as ParameterTree

from pyqtgraph.parametertree import Parameter, parameterTypes

from pyqtgraph.Qt import QtCore, QtGui

class MyGroup(parameterTypes.GroupParameter):

    def __init__(self, *args):

       super().__init__(name='GroupA')

       self.addChild(parameterTypes.ListParameter(name='idx', values=[0, 1, 2, 3], value=0))

       for i in range(4):

           self.addChild(Parameter.create(name=str(i), type='group', children=[{

               'name' : 'member', 'type' : 'str'

           }]))

       self.update_value()

    def treeStateChanged(self, param, changes):

       if param is self.child('idx'):

           # Show the element at this index

           self.update_value()

       

   def update_value(self):

       # Destroy the old child

       for child in self.children():

           if child.name() != 'idx':

               child.hide()

       idx = self.child('idx').value()

       self.child(str(idx)).show()

tree.addParameters(MyGroup())

win = QtGui.QWidget()

layout = QtGui.QGridLayout()

win.setLayout(layout)

layout.addWidget(tree)

win.show()

## Start Qt event loop unless running in interactive mode or using pyside.

if __name__ == '__main__':

   import sys

   if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):

       QtGui.QApplication.instance().exec_()

When I call this method in the constructor, everything works fine, only the group with the default value of the 'index' parameter of group_a is shown. However, once the Tree is visible and I change the value of the 'index' parameter in GroupA, the respective subgroups will neither be hidden nor shown. Is there any good solution to this issue? Or am I doing something wrong?

[WodkaRHR]

Also i tried to add

super().treeStateChanged(param, changes)

To the treeStateChanged method of the class, however with no results.