[PyQt] question about size hints

Darren Dale dsdale24 at gmail.com
Sun Apr 18 17:42:47 BST 2010

I have a question about size hints that can be illustrated with the
simple example below. If I create my Test widget so it returns a size
hint of (200,100), it is rendered with a size of 200, 100. If I create
Test so it is 100x70, it is rendered to be 200x100. If I create test
to be 1000x700, it is rendered to be 853x533 (my screen resolution is
1280x800). If I set the size policy to be fixed, then the central
widget size policy is respected, but I can't resize the window. How
can I make m respect the size hint of the central widget, but still
maintain the ability to resize the window?

Thank you,

import sys
from PyQt4 import QtCore, QtGui

class Test(QtGui.QWidget):

    def __init__(self, width, height):
        #self.setSizePolicy(QtGui.QSizePolicy.Fixed, QtGui.QSizePolicy.Fixed)
        print 'Central widget should have width=%d, height=%d' %(width, height)
        self._width = width
        self._height = height

    def sizeHint(self):
        return QtCore.QSize(self._width, self._height)

app = QtGui.QApplication([])
m = QtGui.QMainWindow()
c = Test(1000, 700)
s = c.size()
print 'but central widget has width=%d, height=%d'% (s.width(), s.height())

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