[PyQt] QLabel word wrap causes incorrect sizeHint

[Jugdish]

If you enable wordWrap on a QLabel, it calculates the sizeHint()
incorrectly. When there is a certain length of text in the label, it seems
to calculate the sizeHint() based on if the text were wrapped -- even when
it isn't -- causing the height to be larger than it should. Here is a simple
example:

####################################################
from PyQt4 import QtGui

class MyWidget(QtGui.QWidget):
    def __init__(self, wordWrap, parent=None):
        super(MyWidget, self).__init__(parent)
        self.setFixedWidth(800)

        self.label = QtGui.QLabel()
        self.label.setFrameStyle(QtGui.QFrame.Box)
        self.label.setWordWrap(wordWrap)
        self.label.setText("Word wrap is set to '%s'" % wordWrap)

        layout = QtGui.QVBoxLayout()
        layout.addWidget(self.label)
        self.setLayout(layout)

if __name__ == "__main__":
    app = QtGui.QApplication([])
    w1 = MyWidget(True)
    w2 = MyWidget(False)
    w1.show()
    w2.show()
    print "wordWrap sizeHint() =", w1.label.sizeHint()
    print "non-wordWrap sizeHint() =", w2.label.sizeHint()
    app.exec_()
####################################################

If you run this, you see that the label with wordWrap enabled has a larger
top and bottom margin, and the sizeHint returned is 112x33 whereas the one
without wordWrap has a sizeHint of 169x18.

Any ideas why this is and how to avoid it?

Thanks,
-Jugdish
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.riverbankcomputing.com/pipermail/pyqt/attachments/20100118/cb7f89a0/attachment.html>