[PyKDE] PyQt4: setPaletteBackgroundColor

[Patrick Stinson]

this is interestin because the palette still doesn't propogate to the
widgets' children.

"""
A common base class for all pk widgets.
"""

from PyQt4.QtGui import QFrame, QPalette


class PKWidget(QFrame):
    """ Conveinience class """
    def set_background(self, color):
        palette = QPalette()
        palette.setColor(QPalette.Window, color)
        palette.setColor(QPalette.Background, color)
        self.setPalette(palette)



On 2/7/06, Gerard Vermeulen <gerard.vermeulen at grenoble.cnrs.fr> wrote:
>
> On Tue, 7 Feb 2006 14:11:46 -0900
> Patrick Stinson <patrickkidd at gmail.com> wrote:
>
> > I relaize that this is a question for qt-interest, but I'm getting a
> slow
> > response.
> >
> > What is the preferred method for setting the background color of a
> widget in
> > qt4? I'm using palette().setColor(QPalette.Window, mycolor)), but this
> > setting for child widgets seems to be overriden by the color you set the
> > parent widget with. Are you supposed to draw a rect in paintEvent()? The
> > QWidget docs don't seem to say much.
> >
>
> It is the C++ reference returned by Qt's palette() which bites you. You
> change the palette, but it is still shared with the other widgets in the
> widget tree that your widget is part of.
>
> A work-around is to explicitly create a palette (from a not yet released
> PyQwt-5 example):
>
>     def __colorTheme(self, base):
>         background = base.dark(150)
>         foreground = base.dark(200)
>
>         mid = base.dark(110)
>         dark = base.dark(170)
>         light = base.light(170)
>         text = foreground.light(800)
>
>         palette = QtGui.QPalette()
>         for colorGroup in colorGroupList:
>             palette.setColor(colorGroup, QtGui.QPalette.Base, base)
>             palette.setColor(colorGroup, QtGui.QPalette.Background,
> background)
>             palette.setColor(colorGroup, QtGui.QPalette.Mid, mid)
>             palette.setColor(colorGroup, QtGui.QPalette.Light, light)
>             palette.setColor(colorGroup, QtGui.QPalette.Dark, dark)
>             palette.setColor(colorGroup, QtGui.QPalette.Text, text)
>             palette.setColor(colorGroup, QtGui.QPalette.Foreground,
> foreground)
>
>         return palette
>
>     # __colorTheme()
>
> and elsewhere __colorTheme() is used as:
>
>     def __init__(self, *args):
>         QtGui.QFrame.__init__(self, *args)
>         self.setPalette(
>             self.__colorTheme(QtGui.QColor(QtCore.Qt.darkGray).dark(150)))
>
> This is a nasty pitfall, because the references returned by Qt are quite
> often
> shared and Python programmers have to be aware of this.
>
> Gerard
>
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>



--
Patrick Kidd Stinson
http://www.patrickkidd.com/
http://pkaudio.sourceforge.net/
http://pksampler.sourceforge.net/
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