How to Fullscreen the child widget

[redstoneleo]

How to Fullscreen the child widget

The UI is as following
http://img.my.csdn.net/uploads/201212/06/1354779576_2592.jpg

What I want to do is that
When doubleclick the black widget ,it should become in full screen mode ,then if I doubleclick again ,it should return back .
So how to ?

showFullScreen()only affects windows

but when I setWindowFlags(Qt.Window) of that black widget ,the UI becomes like this

http://img.my.csdn.net/uploads/201212/06/1354779928_2090.jpg

so how can I implement this functionality ?

BTW ,Phonon.VideoWidget Inherits QWidget and it has setFullScreen() method ,who know how it is implemented ?

[danut.iurascu]

This is just a layout issue, should not be related with the setFullScreen() implementation.
You just need to add a QGridLayout in the main window, and use the grid as the main container.

[jazzycamel]

The following is a basic working example of what I think you're trying to do. It also hides the lower controls (sliders and buttons) in full screen mode like a media player would (just delete line 55 to prevent this):

@
from PyQt4.QtCore import *
from PyQt4.QtGui import *

class BlackWidget(QWidget):

doubleClick=pyqtSignal()

def __init__(self, parent=None, **kwargs):
    QWidget.__init__(self, parent, **kwargs)

def paintEvent(self, e):
    p=QPainter(self)
    p.fillRect(self.rect(), Qt.black)

def mouseDoubleClickEvent(self, e):
    self.doubleClick.emit()

class Widget(QWidget):
def init(self, parent=None):
QWidget.init(self, parent)

    self.resize(640,480)
    self._fullScreen=False

    l=QGridLayout(self)

    blackWidget=BlackWidget(self, doubleClick=self.changeScreenSize)
    l.addWidget(blackWidget, 0, 0, 1, 4)

    self._controls=[]

    slider1=QSlider(Qt.Horizontal, self)
    self._controls.append(slider1)
    l.addWidget(slider1, 1, 0, 1, 4)

    button1=QPushButton("Button 1", self)
    self._controls.append(button1)
    l.addWidget(button1, 2, 0)

    button2=QPushButton("Button 2", self)
    self._controls.append(button2)
    l.addWidget(button2, 2, 1)

    button3=QPushButton("Button 3", self)
    self._controls.append(button3)
    l.addWidget(button3, 2, 2)

    slider2=QSlider(Qt.Horizontal, self)
    self._controls.append(slider2)
    l.addWidget(slider2, 2, 3)

@pyqtSlot()
def changeScreenSize(self):
    self.showNormal() if self._fullScreen else self.showFullScreen()
    for c in self._controls: c.setVisible(self._fullScreen)
    self._fullScreen^=True

if name=="main":
from sys import argv, exit
a=QApplication(argv)
w=Widget()
w.show()
w.raise_()
exit(a.exec_())
@

Hope this helps ;o)