Hello,
I just got started with a simple Python-based Plasma widget. Right now I'm
getting segfaults I cannot explain; so maybe someone could give me a hint,
whether this is really a bug or a my fault.
I roughly followed an howto from techbase and everything works fine until I
call "addStretch" on a QGraphicsLinearLayout instance. Then I'm getting a
segfault with the following backtrace:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb3db9720 (LWP 11622)]
0xb741e737 in QGraphicsLayoutItem::isLayout () from /usr/lib/libQtGui.so.4
(gdb) bt
#0 0xb741e737 in QGraphicsLayoutItem::isLayout () from /usr/lib/libQtGui.so.4
#1 0xa85debf1 in ?? () from /usr/lib/pymodules/python2.5/PyQt4/QtGui.so
#2 0xa8b60bdd in PyCFunction_Call (func=0xa7078a6c, arg=0xa772a48c, kw=0x0) at
../Objects/methodobject.c:73
#3 0xa8bb2f09 in PyEval_EvalFrameEx (f=0x846620c, throwflag=0) at
../Python/ceval.c:3612
#4 0xa8bb3e3f in PyEval_EvalFrameEx (f=0x84012cc, throwflag=0) at
../Python/ceval.c:3698
#5 0xa8bb488d in PyEval_EvalCodeEx (co=0xa8a8f800, globals=0xa8a9e3e4,
locals=0x0, args=0xa772a738, argcount=1, kws=0x0, kwcount=0, defs=0x0,
defcount=0, closure=0x0)
at ../Python/ceval.c:2875
#6 0xa8b4b5fa in function_call (func=0xa7fd5bc4, arg=0xa772a72c, kw=0x0) at
../Objects/funcobject.c:517
#7 0xa8b27a47 in PyObject_Call (func=0x0, arg=0xa772a72c, kw=0x0) at
../Objects/abstract.c:1861
#8 0xa8b2f875 in instancemethod_call (func=0xa7fd5bc4, arg=0xa772a72c, kw=0x0)
at ../Objects/classobject.c:2519
#9 0xa8b27a47 in PyObject_Call (func=0x0, arg=0xa8ac502c, kw=0x0) at
../Objects/abstract.c:1861
#10 0xa8bacb8c in PyEval_CallObjectWithKeywords (func=0xa772966c,
arg=0xa8ac502c, kw=0x0) at ../Python/ceval.c:3481
#11 0xb3b2e883 in ?? () from /usr/lib/python2.5/site-packages/sip.so
#12 0xa772966c in ?? ()
#13 0xa8ac502c in ?? ()
#14 0x00000000 in ?? ()
And here is the actual code.
class LosungApplet(plasmascript.Applet):
def __init__(self,parent,args=None):
plasmascript.Applet.__init__(self,parent)
@pyqtSignature("strLinkClicked(const QString &)")
def strLinkClicked(self, url):
self.linkClicked(QUrl(url))
@pyqtSignature("linkClicked(const QUrl &)")
def linkClicked(self, url):
#webbrowser.open(url.toString(), new=2)
kio.KRun.runUrl(kdecore.KUrl(url), "text/html", None)
def _setupWebView(self, losung):
webView = Plasma.WebView(self.applet)
webView.page().setLinkDelegationPolicy(QWebPage.DelegateAllLinks)
QObject.connect(webView.page(), SIGNAL("linkClicked( const QUrl & )"),
self.linkClicked)
r = LosungenRenderer()
webView.setHtml(r.renderLosung(losung))
return webView
def _setupLabel(self, losung):
label = Plasma.Label()
nw = label.nativeWidget()
nw.setTextInteractionFlags(Qt.TextBrowserInteraction)
QObject.connect(label, SIGNAL("linkActivated( const QString & )"),
self.strLinkClicked)
r = LosungenRenderer()
label.setText(r.renderLosung(losung))
return label
def init(self):
self.setHasConfigurationInterface(True)
self.setAspectRatioMode(Plasma.IgnoreAspectRatio)
self.losungenDB = LosungenDB("%s%s"%(self.package().path(),
LOSUNGEN_CSV))
self.theme = Plasma.Svg(self)
self.theme.setImagePath("widgets/background")
self.setBackgroundHints(Plasma.Applet.DefaultBackground)
arrowLeftIcon = kdeui.KIcon("arrow-left")
arrowRightIcon = kdeui.KIcon("arrow-right")
goTodayIcon = kdeui.KIcon("go-jump-today")
self.arrowLeft = Plasma.ToolButton()
self.arrowLeft.nativeWidget().setIcon(arrowLeftIcon)
self.arrowLeft.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)
self.arrowRight = Plasma.ToolButton()
self.arrowRight.nativeWidget().setIcon(arrowRightIcon)
self.goToday = Plasma.ToolButton()
self.goToday.nativeWidget().setIcon(goTodayIcon)
losung = self.losungenDB.getLosung(datetime.date.today())
self.contentWidget = self._setupLabel(losung)
#self.layout = QGraphicsLinearLayout(Qt.Vertical, self.applet)
buttons = QGraphicsLinearLayout(Qt.Horizontal, self.applet)
buttons.addItem(self.arrowLeft)
buttons.addStretch()
buttons.addItem(self.goToday)
buttons.addStretch()
buttons.addItem(self.arrowRight)
#self.layout.addItem(self.contentWidget)
#self.layout.addItem(buttons)
self.setLayout(buttons)
self.resize(350,200)
def paintInterface(self, painter, option, rect):
pass
def CreateApplet(parent):
return LosungApplet(parent)
Thanks a lot for any hints,
Johannes Wolter
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