how to update only one row of model in qtableview @ pyside6

[Aiden.k]

I want to update only 1 row or 1 cell.

but all cell is updated when datachanged is emitted.

data() was called hundreds times for each cells and each roles.

what is wrong with this code ?

class TestitemTableModel(QAbstractTableModel):

def __init__(self, data):
    super(TestitemTableModel, self).__init__()
    self._data = data

def data(self, index, role):

    if role == QtCore.Qt.DisplayRole:
        value = self._data.iloc[index.row(), index.column()]
        return str(value)

    if role == QtCore.Qt.TextAlignmentRole:
        return int(QtCore.Qt.AlignCenter | QtCore.Qt.AlignVCenter)


def setData(self, index, value, role):

    if not index.isValid():
        return False

    if role == QtCore.Qt.DisplayRole:
        self._data.iloc[index.row(), index.column()] = 'WTF'
        
        self.dataChanged.emit(index, index)

        return True

    return QAbstractTableModel.setData(self,index,value,role)

def rowCount(self, index):
    return self._data.shape[0]

def columnCount(self, index):
    return self._data.shape[1]

def headerData(self, section, orientation, role):
    if role == QtCore.Qt.DisplayRole:
        if orientation == QtCore.Qt.Horizontal:
            return str(self._data.columns[section])
        
        if orientation == QtCore.Qt.Vertical:
            return str(self._data.index[section])

[JonB]

@Aiden-k
I don't know exactly what your problem is, or what you are trying to do.

Qt infrastructure will call data() multiple times with different roles.

Your setData() sets the data on the DisplayRole. This is wrong. setData() is called with EditRole to make an update on the value. Start by getting that right.

[Aiden.k]

This situation is occured by below option.

tableview.horizontalHeader().setSectionResizeMode(QHeaderView.ResizeToContents)

Works fine when I disable that option.