Setting header data in QTableView

[Maurizio Berti]

Il giorno sab 6 feb 2021 alle ore 10:46 Rodrigo de Salvo Braz <
rodrigobraz at gmail.com> ha scritto:

> Hi,
>
> Qt's documentation says
> <https://doc.qt.io/qtforpython-5.12/overviews/sql-presenting.html> one
> can use setHeaderData to set column headers.
>
> However, I used it in the simple example below and it has no effect. Why
> not?
>

If you simply try to print the result of your `setHeaderData()` calls,
you'll see that the returned value is always False.

By default abstract item models do not implement anything on their basic
methods, especially when trying to set data and properties on the model
itself. Those methods are implemented in models that are *not* abstract and
allow data writing (such as QStandardModelItem or, in your case,
QSqlQueryModel and all its inherited classes which are reported in your
link). The same would happen, in fact, for setData(), which makes sense:
being an abstract model, it's up to you to actually set the data and return
whether if the setting actually occurred or not.

Methods like setHeaderData() will always return False (meaning that the
data has not been set) unless they're actually implemented in order to
return True.

class TableModel(QtCore.QAbstractTableModel):
    def __init__(self):
        super().__init__()
        self.headers = []
        for i in range(4):
            self.setHeaderData(i, Qt.Horizontal, "Column " + str(i))

    def setHeaderData(self, section, orientation, value,
role=QtCore.Qt.EditRole):
        if (orientation == QtCore.Qt.Horizontal and
            0 <= section < self.columnCount() and role ==
QtCore.Qt.EditRole):
                while len(self.headers) < section + 1:
                    self.headers.append(None)
                self.headers[section] = value
                self.headerDataChanged.emit(orientation, section, section)
                return True
        return False

-- 
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cuore. - "Sostiene Pereira", Antonio Tabucchi
http://www.jidesk.net
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