The QHeaderView has a slight vertical offset between the row index and the text in each row

[zhyemqww]

As shown in the figure, there is a slight vertical offset between the row index and the contents of each column. How can I resolve this issue? By the way, how can I make the row index start from 1 instead of 0?

class PandasModel(QAbstractTableModel):
    """A model to interface a Qt view with pandas dataframe """

    def __init__(self, dataframe: pd.DataFrame, parent=None):
        QAbstractTableModel.__init__(self, parent)
        self._dataframe = dataframe

    def rowCount(self, parent=QModelIndex()) -> int:
        """ Override method from QAbstractTableModel

        Return row count of the pandas DataFrame
        """
        if not parent.isValid():
            return len(self._dataframe)
        return 0

    def columnCount(self, parent=QModelIndex()) -> int:
        """Override method from QAbstractTableModel

        Return column count of the pandas DataFrame
        """
        if not parent.isValid():
            return len(self._dataframe.columns)
        return 0

    def data(self, index: QModelIndex, role=Qt.ItemDataRole) -> any:
        """Override method from QAbstractTableModel

        Return data cell from the pandas DataFrame
        """
        if not index.isValid():
            return None

        if role == Qt.ItemDataRole.DisplayRole:
            return str(self._dataframe.iloc[index.row(), index.column()])

        if role == Qt.ItemDataRole.TextAlignmentRole:
            return Qt.AlignmentFlag.AlignLeft | Qt.AlignmentFlag.AlignVCenter  # Set the alignment to Left

        return None

    def headerData(self, section: int, orientation: Qt.Orientation, role: Qt.ItemDataRole) -> any:
        """Override method from QAbstractTableModel

        Return dataframe index as vertical header data and columns as horizontal header data.
        """
        if role == Qt.ItemDataRole.DisplayRole:
            if orientation == Qt.Orientation.Horizontal:
                return str(self._dataframe.columns[section])

            if orientation == Qt.Orientation.Vertical:
                return str(self._dataframe.index[section])

        return None


def creat_table(qtable_view, data):
    qtable_view: QTableView
    qtable_view.setStyleSheet(STYLE_SHEET["table_view"])
    qtable_view.horizontalHeader().setStretchLastSection(True)
    qtable_view.setAlternatingRowColors(True)
    qtable_view.setSelectionBehavior(QTableView.SelectionBehavior.SelectRows)  # Updated API

    # Hide the row headers (vertical header)
    # qtable_view.verticalHeader().setVisible(False)

    model = PandasModel(data)
    qtable_view.setModel(model)```

[StarterKit]

Hi @zhyemqww
This question is easy - "how can I make the row index start from 1 instead of 0?".
In your headerData method your should return str(self._dataframe.index[section]) + 1 instead of str(self._dataframe.index[section]) for Qt.Orientation.Vertical.

Wit regards to vertical offset... I think it depends on our OS and desktop theme being used. I may propose to use custom drawing but I think (and hope) it might be an overkill for this case. So I rather wait for more experienced people to comment on it. But.... I have one more suspect looking at your screenshot - you might use different fort for header than for data. So I would start with it - to check that fonts set for headers and body are the same.

[zhyemqww]

@StarterKit When I modified the font for both the header and the body, keeping them consistent, the problem was not resolved.

[JonB]

@zhyemqww
You may not like to hear this, especially being a Python developer, but I wonder if you might look at the source of how Qt positions the header's rows/columns to see if you can figure from that why it is "out of sync" wrt the content rows/columns.