A simpler fix would be:
class FigureWindow(QtGui.QMainWindow):
def __init__(self):
super(FigureWindow, self).__init__()
def closeEvent(self, event):
super(FigureWindow, self).closeEvent(event)
self.emit(QtCore.SIGNAL('destroyed()'))
and replacing QtGui.QMainWindow by FigureWindow in FigureManagerQT.
Pierre
Pierre Raybaut a écrit :
> Hi,
>
> Some Spyder users have reported a critical bug occuring with
> matplotlib 0.99's Qt4 backend and PyQt4 v4.6 (e.g. in Ubuntu Karmic).
>
>
> Here is the traceback after calling 'plot([])', closing figure and
> calling again 'plot([])' (e.g. in an IPython session with options
> --pylab and --q4thread):
>
> Traceback (most recent call last):
> File "/home/rick/Temp/untitled0.py", line 9, in <module>
> show()
> File "/usr/lib/pymodules/python2.6/matplotlib/backends/backend_qt4.py",
> line 63, in show
> manager.window.show()
> RuntimeError: underlying C/C++ object has been deleted
>
>
> I found out that the 'destroyed()' signal (connected in class
> FigureManagerQT) is never emitted when figure is closed.
> As a consequence, SIP is not very happy when trying to draw a deleted
> object...
>
> I made the following changes to make it work:
>
> # New class to clarify code in FigureManagerQT
> class FigureWindow(QtGui.QMainWindow):
> def __init__(self, num, canvas, close_callback):
> super(FigureWindow, self).__init__()
> self.close_callback = close_callback
> self.setAttribute(QtCore.Qt.WA_DeleteOnClose)
> self.setWindowTitle("Figure %d" % num)
> image = os.path.join(matplotlib.rcParams['datapath'],
> 'images', 'matplotlib.png')
> self.setWindowIcon(QtGui.QIcon(image))
> self._destroying = False
> self.setCentralWidget(canvas)
> if matplotlib.is_interactive():
> self.show()
> def closeEvent(self, event):
> super(FigureWindow, self).closeEvent(event)
> self.close_callback()
>
> class FigureManagerQT( FigureManagerBase ):
> """
> Public attributes
>
> canvas : The FigureCanvas instance
> num : The Figure number
> toolbar : The qt.QToolBar
> window : The qt.QMainWindow
> """
>
> def __init__( self, canvas, num ):
> if DEBUG: print 'FigureManagerQT.%s' % fn_name()
> FigureManagerBase.__init__( self, canvas, num )
> self.canvas = canvas
>
> # Give the keyboard focus to the figure instead of the manager
> self.canvas.setFocusPolicy( QtCore.Qt.ClickFocus )
> self.canvas.setFocus()
>
> self.window = FigureWindow(num, self.canvas, self._widgetclosed)
> self.toolbar = self._get_toolbar(self.canvas, self.window)
> self.window.addToolBar(self.toolbar)
> QtCore.QObject.connect(self.toolbar, QtCore.SIGNAL("message"),
> self.window.statusBar().showMessage)
> # [...]
>
> And we may now remove the "QtCore.QObject.disconnect" for the no
> longer existing signal 'destroyed()' in method 'FigureManagerQT.
> destroy'.
>
> HTH
>
> Cheers,
> Pierre
>
>
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