python - Inserted tabs not showing in QTabWidget despite show() called -

i have qtabwidget in pyqt provides possibility tear off tabs , re-attach them when closed. works except newly attached tabs aren't showing. blank widget showing , widget shown after current tab has been changed , changed back.

i've searched stackoverflow , answers similar problems have pointed out added widget's show()-method needs called after new tab added. tried newly added tab still not showing.

slimmed down example code:

from pyqt4 import qtgui, qtcore   class detachabletabwidget(qtgui.qtabwidget):      """ subclass of qtabwidget provides ability detach     tabs , making floating windows them can reattached.     """      def __init__(self, *args, **kwargs):         super(detachabletabwidget, self).__init__(*args, **kwargs)         self.settabbar(_detachabletabbar())      def detach_tab(self, i):         """ make floating window of tab.          :param i: index of tab detach         """         teared_widget = self.widget(i)         widget_name = self.tabtext(i)          # shift index left , remove tab.         self.setcurrentindex(self.currentindex() - 1 if self.currentindex() > 0 else 0)         self.removetab(i)          # store widgets window-flags , close event.         teared_widget._flags = teared_widget.windowflags()         teared_widget._close = teared_widget.closeevent          # make stand-alone window.         teared_widget.setwindowflags(qtcore.qt.window)         teared_widget.show()          # redirect windows close-event reattachment.         teared_widget.closeevent = lambda event: self.attach_tab(teared_widget, widget_name)      def attach_tab(self, widget, name):         """ attach widget when receiving signal child-window.          :param widget: :class:`qtgui.qwidget`         :param name: name of attached widget         """         widget.setwindowflags(widget._flags)         widget.closeevent = widget._close         self.addtab(widget, name)         self.setcurrentwidget(widget)         self.currentwidget().show()   class _detachabletabbar(qtgui.qtabbar):      def __init__(self, *args, **kwargs):         super(_detachabletabbar, self).__init__(*args, **kwargs)         self._start_drag_pos = none         self._has_dragged = false         self.setmovable(true)      def mousepressevent(self, event):         # keep track of drag-starts.         self._start_drag_pos = event.globalpos()         super(_detachabletabbar, self).mousepressevent(event)      def mousemoveevent(self, event):         # if tab detached, nothing.         if self._has_dragged:             return          # detach-tab if drag in y-direction large enough.         if abs((self._start_drag_pos - event.globalpos()).y()) >= qtgui.qapplication.startdragdistance()*8:             self._has_dragged = true             self.parent().detach_tab(self.currentindex())      def mousereleaseevent(self, event):         self._has_dragged = false   if __name__ == '__main__':     import sys     app = qtgui.qapplication(sys.argv)     window = qtgui.qmainwindow()     widget = detachabletabwidget()      widget.addtab(qtgui.qlabel('tab 1'), 'tab 1')     widget.addtab(qtgui.qlabel('tab 2'), 'tab 2')      window.setcentralwidget(widget)     window.show()     sys.exit(app.exec_()) 

it seems when accept qcloseevent (default behavior) widget hidden @ end of closeevent handler. call show() occurs before end of handler. solution ignore qcloseevent.

    ...     teared_widget.closeevent = lambda event: self.attach_tab(teared_widget, widget_name, event)  def attach_tab(self, widget, name, event):     """ attach widget when receiving signal child-window.      :param widget: :class:`qtgui.qwidget`     :param name: name of attached widget     :param event: close event     """     widget.setwindowflags(widget._flags)     widget.closeevent = widget._close     self.addtab(widget, name)     self.setcurrentwidget(widget)     event.ignore()