[PyKDE] Next sip4 Problem, WAS: ANN: SIP v4.0pre3 Released

[Hans-Peter Jansen]

On Wednesday 29 October 2003 14:07, Phil Thompson wrote:
>
> There are two unrelated bugs - fixes will be in tonight's snapshot,
> or apply the attached patch.

Thanks, applied it, and they vanished. Cool.

Now, I have two (related?) problems in a QDataTable derived class:

Traceback (most recent call last):
  File "/home/hp/src/python/qt/wiv/artikeltable.py", line 38, in paintField
    fn = str(field.name())
AttributeError: name
QWidget (qt_clipped_viewport): deleted while being painted
QPaintDevice: Cannot destroy paint device that is being painted

Traceback (most recent call last):
  File "/home/hp/src/python/qt/wiv/artikeltable.py", line 51, in paintField
    Qt.AlignRight|Qt.AlignVCenter, v)
RuntimeError: underlying C/C++ object has been deleted
QWidget (qt_clipped_viewport): deleted while being painted
QPaintDevice: Cannot destroy paint device that is being painted

which are triggered unpredictably. Here's the source:

# -*- coding: iso-8859-1 -*-
from qt import *
from qtsql import QDataTable

class ArtikelTable(QDataTable):
    def __init__(self, *args):
        #print "ArtikelTable.__init__"
        apply(QDataTable.__init__, (self,) + args)
        self.addColumn("artnr", "ArtNr")
        self.addColumn("bez", "Bezeichnung")
        self.addColumn("firma", "Firma")
        self.addColumn("sorte", "Sorte")
        self.addColumn("gewicht", "Gewicht")
        self.addColumn("faktor", "Faktor")
        self.addColumn("bem", "Bemerkungen")
        self.addColumn("created", "Erfasst")
        self.addColumn("changed", "Geändert")
        self.addColumn("changedby", "von")
        self.setReadOnly(1)
        self.setSorting(1)
        self.setAutoEdit(0)
        ArtikelTable_stringlist = QStringList()
        ArtikelTable_stringlist.append("artnr ASC")
        self.setSort(ArtikelTable_stringlist)

    def keyPressEvent(self, e):
        k = e.key()
        if k == Qt.Key_Return or k == Qt.Key_Enter:
            self.emit(PYSIGNAL("EditArtikel"), ())
            e.accept()
        else:
            QDataTable.keyPressEvent(self, e)

    def paintField(self, p, field, cr, b):
        if not field:
            return
        fn = str(field.name())		                   # <<< Line 38
        if fn in ("gewicht", "faktor"):
            cur = self.sqlCursor()
            gew = cur.field("gewicht").value().toDouble()
            fak = cur.field("faktor").value().toDouble()
            if fak == 0.0 or gew > (fak * 1.8):
                p.setPen(QColor("red"))
            v = QString("%.2f" % field.value().toDouble())
            p.drawText(2, 2, cr.width()-8, cr.height()-4,
                        Qt.AlignRight|Qt.AlignVCenter, v)
        elif fn in ("artnr", "firma", "sorte"):
            v = field.value().toString()
            p.drawText(2, 2, cr.width()-8, cr.height()-4,
                        Qt.AlignRight|Qt.AlignVCenter, v)  # <<< Line 51
        else:
            QDataTable.paintField(self, p, field, cr, b)

Cheers,
Pete