How to get complete fullscreen with PyQt4

Question

I am having trouble getting a QWidget to real fullscreen in PyQt 4.8 . I took two approaches:

1. Code directly (this works)

    import sys from PyQt4 import QtGui, QtCore import qimage2ndarray as q2n import numpy as np from scipy.misc.common import lena class FullscreenWindow(QtGui.QWidget): def __init__(self, parent=None): QtGui.QWidget.__init__(self, parent) self.qg = QtGui.QGraphicsView(self) self.scene = QtGui.QGraphicsScene(self) self.qg.setScene(self.scene) # Make window fullscreen and always on top self.setWindowFlags(QtCore.Qt.WindowStaysOnTopHint) self.setWindowFlags(QtCore.Qt.FramelessWindowHint) # set the image (lena) qimg = q2n.array2qimage(np.pad(lena(), ((0,0),(0,0)), mode='constant')) pix = QtGui.QPixmap(qimg) self.scene.clear() self.scene.addPixmap(pix) self.show() class MainWindow(QtGui.QMainWindow): def __init__(self, parent=None): QtGui.QMainWindow.__init__(self, parent) self.fullscreen = FullscreenWindow() qdw = QtGui.QDesktopWidget() screen = qdw.screenGeometry(screen=1) self.fullscreen.setGeometry(screen) if __name__ == '__main__': app = QtGui.QApplication(sys.argv) winMain = MainWindow(None) winMain.show() app.exec_()

2. Designed the window(s) with QtDesigner, having a QWidget with a QGraphicsView, set a QGraphicsScene with my Image. Basically the same code as above but importing the ui-file with the uic module. An image of the result is appended. I am always getting a gray border that appears to be part of the QWidget.

Why is that? How to get rid of it?

Answer 1

To my knowledge, its the default style sheet of QWidgets adding that slight border to themselves; in this case QGraphicsView .

So, if set the style sheet on your main window through setStyleSheet , you can override the css to remove the border--

    styleSheetCss="QGraphicsView {border-width: 0px;}"
    self.setStyleSheet(styleSheetCss)

In your example-

class FullscreenWindow(QtGui.QWidget):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent) 
        self.qg = QtGui.QGraphicsView(self)
        self.scene = QtGui.QGraphicsScene(self)
        self.qg.setScene(self.scene)

        # Make window fullscreen and always on top
        self.setWindowFlags(QtCore.Qt.WindowStaysOnTopHint)
        self.setWindowFlags(QtCore.Qt.FramelessWindowHint)

        # set the image (lena)
        qimg = q2n.array2qimage(np.pad(lena(), ((0,0),(0,0)), mode='constant'))        
        pix = QtGui.QPixmap(qimg)        
        self.scene.clear()
        self.scene.addPixmap(pix)  

        styleSheetCss="QGraphicsView {border-width: 0px;}"
        self.setStyleSheet(styleSheetCss)

        self.show()   

If there is another way to address this problem, I dunno, but this has worked for me.

Side note, you can also string css changes together-

styleSheetCss="""
QPushButton {color:#ffffff;background-color:#202020;padding:4px;border:1px solid #303030;}
QMenu {color:#ffffff;background-color:#505050;border:1px solid #282828;}
QMenu::item {color:#ffffff;background-color:#505050;padding:2px;}
QMenu::item:selected {color:#ffffff;background-color:#6c6c6c;padding:2px;}
QSlider {background-color:#323232;}
QScrollBar:vertical {width:10px;color:#ffffff;background-color:#808080;border:1px solid #202020;}"""
self.setStyleSheet(styleSheetCss)

Answer 2

Problem is a bug with QGraphicsView::fitInView() they don't care about: https://bugreports.qt.io/browse/QTBUG-11945

Solution:

self.setViewportMargins(-2, -2, -2, -2)
self.setFrameStyle(QFrame.NoFrame)

self is QGraphicsView in this case, so you might want to change this.