[PyQt] Phonon hasVIdeo problem

[Gionata Boccalini]

Hi everyone,
     I need to put a video widget in my application, which is made with 
Phonon framework, and has a button to load a file into the viewer. The 
class is simply:

class VideoWidget(QWidget):
     def __init__(self,  parent = None):
         super(VideoWidget, self).__init__(parent)

         self.__fileName = ""

         openButton = QPushButton(self.tr("Open..."))
         self.__playButton = QPushButton()
         self.__playButton.setEnabled(False)
         
self.__playButton.setIcon(self.style().standardIcon(QStyle.SP_MediaPlay))

         self.__positionSlider = Phonon.SeekSlider(self)
         self.__positionSlider.setIconVisible(False)
         self.__positionSlider.show()

         controlLayout = QHBoxLayout()
         controlLayout.setMargin(0)
         controlLayout.addWidget(openButton)
         controlLayout.addWidget(self.__playButton)
         controlLayout.addWidget(self.__positionSlider)

         self.__player = Phonon.VideoWidget()
         self.__player.setSizePolicy(QSizePolicy.Expanding,  
QSizePolicy.Expanding)
         audioOutput = Phonon.AudioOutput(Phonon.VideoCategory, self)

         self.__mediaObj = Phonon.MediaObject()
         Phonon.createPath(self.__mediaObj,  self.__player)
         Phonon.createPath(self.__mediaObj, audioOutput);

         self.__positionSlider.setMediaObject(self.__mediaObj)

         layout = QVBoxLayout()
         layout.addWidget(self.__player)
         layout.addLayout(controlLayout)

         self.setLayout(layout)

         # Signals
         self.__playButton.clicked.connect(self.play)
         openButton.clicked.connect(self.open)
         self.__mediaObj.hasVideoChanged.connect(self.hasVideoChanged)


I have two slots and a callable used from the outside of this class:

     @QtCore.pyqtSlot("bool")
     def hasVideoChanged(self,  res):
         if self.__mediaObj.hasVideo():
             self.__playButton.setEnabled(True)


     @QtCore.pyqtSlot()
     def play(self):
         if not self.__mediaObj.state() == Phonon.PlayingState:
             self.__mediaObj.play()
             
self.__playButton.setIcon(self.style().standardIcon(QStyle.SP_MediaPause))
         else:
             self.__mediaObj.pause()
             
self.__playButton.setIcon(self.style().standardIcon(QStyle.SP_MediaPlay))


    def openFile(self,  filename):
         if  not fileName.isEmpty():
             self.__playButton.setEnabled(False)
             self.__fileName = fileName
             
self.__mediaObj.setCurrentSource(Phonon.MediaSource(self.__fileName))


With the "openFile" method one can load  a file (of any type, even a 
non-video file) and try to play it with the widget. I set the play 
button disabled by default, then, if the MediaObject has a video frame, 
the slot  "hasVideoChanged" is ran and the play button is set enabled. 
So the playButton is enabled only when a correct video file is ready to 
be played. But when the file isn't a video file, let's say a text file, 
the slot hasVideoChanged is called again and the method 
self.__mediaObj.hasVideo() returns TRUE!! Since this time the source 
file is not a video, that method should return FALSE! Maybe I have 
misunderstood the documentation but hasVideo() should return true only 
when there is a real video to be played in the file that was set in the 
media source...
As an alternative I could check the MIME type of the file before 
loading, but I prefered the solution integrated with Phonon!
Thanks in advance for your help!

Gionata Boccalini