GTK error on Destructor of PlotWidget caused by missing parent Widget

[David Hornung]

Hello,
 i report a bug using PlotWidget. It appears if I closed my application(code below). But doesn't occur if watches every tab widget.

propably this could help regarding to this article http://stackoverflow.com/questions/12433491/is-this-pyqt-4-python-bug-or-wrongly-behaving-code

errors messages:

(python:30803): Gtk-CRITICAL **: IA__gtk_container_add: assertion 'GTK_IS_CONTAINER (container)' failed

(python:30803): Gtk-CRITICAL **: IA__gtk_widget_realize: assertion 'GTK_WIDGET_ANCHORED (widget) || GTK_IS_INVISIBLE (widget)' failed

(python:30803): Gtk-CRITICAL **: IA__gtk_widget_realize: assertion 'GTK_WIDGET_ANCHORED (widget) || GTK_IS_INVISIBLE (widget)' failed

(python:30803): Gtk-CRITICAL **: IA__gtk_container_add: assertion 'GTK_IS_CONTAINER (container)' failed

(python:30803): Gtk-CRITICAL **: IA__gtk_widget_realize: assertion 'GTK_WIDGET_ANCHORED (widget) || GTK_IS_INVISIBLE (widget)' failed
.....

code snippet below:

app = QtGui.QApplication([])
mw = QtGui.QMainWindow()
cw = QtGui.QWidget(None)
cwl = QtGui.QGridLayout(cw)
tw = QtGui.QTabWidget(cw)
cwl.addWidget(tw)
mw.setCentralWidget(cw)
mw.resize(1024,600)

class MachineView():
    def __init__(self, machine):
        self.machine = machine
        self.data = []
        self.w = QtGui.QWidget(tw)
        self.l = QtGui.QVBoxLayout(self.w)
        self.pw = pg.PlotWidget(parent=self.w)
        self.pwzoom = pg.PlotWidget(parent=self.w)
        self.lr = pg.LinearRegionItem([400,700])

        self.l.addWidget(self.pw)
        self.l.addWidget(self.pwzoom)
        self.pw.addItem(self.lr)
        self.lr.sigRegionChanged.connect(self._updatePlot)
        self.pwzoom.sigXRangeChanged.connect(self._updateRegion)

        self.updateTimer = QtCore.QTimer()
        self.updateTimer.timeout.connect(self.updateData)
        self.updateTimer.start(3000)
        self.updateData()

    def updateData(self):
        self.data = [1,2,3,2]# something what you want
        self.pw.plot(self.data)
        self.pwzoom.plot(self.data)

    def getWidget(self):
        return self.w

    def _updatePlot(self):
         self.pwzoom.setXRange(*self.lr.getRegion(), padding=0)

    def _updateRegion(self):
         self.lr.setRegion(self.pwzoom.getViewBox().viewRange()[0])

class Monitor():
    def __init__(self):
        self.machines = ["m1","m2","m3"]

        self.machineViews = {}
        for machine in self.machines:
            pw = MachineView(machine)
            self.machineViews[machine] = pw
            #cwl.addWidget(pw.getWidget())
            tw.addTab(pw.getWidget(), machine)

monitor = Montior()
mw.show()

[Alex K (arbitraryvalue)]

I get this same issue with the following simple test program:

import pyqtgraph
from pyqtgraph.Qt import QtCore, QtGui

app = QtGui.QApplication([])
plot = pyqtgraph.PlotWidget()

[Alex K (arbitraryvalue)]

With these modifications, the program no longer crashes for me:

import pyqtgraph
from pyqtgraph.Qt import QtCore, QtGui

app = QtGui.QApplication([])
win = QtGui.QMainWindow()
plot = pyqtgraph.PlotWidget(parent=win)
win = None
plot = None

[lcampagn (luke-campagnola)]

Thanks, Alex. I will play around with this.
Please note that pyqtgraph is now hosted at http://github.com/pyqtgraph.