On Oct 30, 2008, at 23:24 , Jeremy Friesner wrote:
> Hi all,
>
> I've been testing my codebase under OS/X Leopard (10.5.5, Intel) and
> Qt4.5.0-tp1 to see if I can find any fresh bugs... my code works fine
> when built against Qt4.4.2, FWIW.
>
> One thing I've found is that if I use QWindowsStyle and set up a
> custom palette, my window's colors don't show up correctly until I
> resize the window. I haven't been able to reproduce this problem
> exactly outside of my program, but here is something I think is
> related:
>
> 1) Edit the file $QTDIR/examples/script/calculator/main.cpp, inserting
> the following lines directly after the declaration of the QApplication
> object on line 57:
>
> {
> app.setStyle(new QWindowsStyle);
> QPalette p = QPlastiqueStyle().standardPalette();
> p.setColor(QPalette::Active, QPalette::Window, Qt::blue);
> app.setPalette(p);
> }
>
> 2) Compile and run the program (you'll need to add the necessary
> #include lines too, of course)
>
> 3) At this point, I would expect to see a Calculator GUI, with widgets
> shown in the WindowsXP style, with a blue background.
>
> However, if I run the program like this:
>
> open calculator.app
>
> then I only see the window flash blue for a second, and then it
> reverts to the default WindowsXP colors. That is wrong, I think.
>
> On the other hand, if I run the program like this:
>
> ./calculator.app/Contents/MacOS/calculator
>
> then the window opens with the correct colors (blue background), but
> reverts to the default WindowsXP colors as soon as it is clicked on.
> This is also wrong.
>
> It should start up blue, and stay blue.
This is because of "desktop settings aware." We constantly check what
the settings are and enforce them on specific widgets, if you do
something interesting with the palette and expect it to inherit, you
will see "flashes" like this.
You can try calling QApplication::setDesktopSettingsAware(false); at
the beginning of your application and see if that solves your problem.
It might work better to set the palette explicitly on the widgets you
wish to have this palette and not expect them to inherit from the
application.
The same applies for QApplication::setFont().
Hope this helps,
--
Trenton Schulz
Senior Software Engineer
Nokia, Qt Software
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