How VLC implement the functionality of playing video in full screen mode ?

[redstoneleo]

How VLC implement the functionality of playing video in full screen mode ?
when you double click the black rectangle ,VLC will play video in full screen mode ,
then if I doubleclick again ,it should return back .
http://www.freeimagehosting.net/st4su

so how to implement this functionality ?
for simplicity ,you can modify the following code to implement it ?thanks
NOTE ： showFullScreen()only affects windows

@import sys
from PyQt4 import QtGui, QtCore

class Player(QtGui.QMainWindow):

def __init__(self, master=None):
    QtGui.QMainWindow.__init__(self, master)


    self.createUI()


def createUI(self):
    
    self.Widget = QtGui.QWidget(self)
    self.setCentralWidget(self.Widget)


    self.VideoFrame = QtGui.QFrame()
    self.Palette = self.VideoFrame.palette()
    self.Palette.setColor (QtGui.QPalette.Window,
                           QtGui.QColor(0,0,0))
    self.VideoFrame.setPalette(self.Palette)
    self.VideoFrame.setAutoFillBackground(True)

    self.PositionSlider = QtGui.QSlider(QtCore.Qt.Horizontal, self)
    self.PositionSlider.setToolTip("Position")
    self.PositionSlider.setMaximum(1000)


    self.HButtonBox = QtGui.QHBoxLayout()
    self.PlayButton = QtGui.QPushButton("Play")
    self.HButtonBox.addWidget(self.PlayButton)


    self.StopButton = QtGui.QPushButton("Stop")
    self.HButtonBox.addWidget(self.StopButton)


    self.HButtonBox.addStretch(1)
    self.VolumeSlider = QtGui.QSlider(QtCore.Qt.Horizontal, self)
    self.VolumeSlider.setMaximum(100)
    
    self.VolumeSlider.setToolTip("Volume")
    self.HButtonBox.addWidget(self.VolumeSlider)

    self.VBoxLayout = QtGui.QVBoxLayout()
    self.VBoxLayout.addWidget(self.VideoFrame)
    self.VBoxLayout.addWidget(self.PositionSlider)
    self.VBoxLayout.addLayout(self.HButtonBox)

    self.Widget.setLayout(self.VBoxLayout)

if name == "main":
QtGui.QApplication.setStyle('macintosh')
app = QtGui.QApplication(sys.argv)
MediaPlayer = Player()
MediaPlayer.show()
MediaPlayer.resize(640, 480)
sys.exit(app.exec_())
@

[Sam]

Did you try the implementation provided "here":http://qt-project.org/forums/viewthread/23852/ as both the posts are same.