make a widget paint itself even thought it is not shown

[momesana]

Your problem is that widget is only resized for the first time when it is first shown.

Well the problem shows up everytime the widget is resized while hidden.

There are ways to fake visibility of a widget - you need to set some flags for it, grab its contents and clear the flags again. Also calling ensurePolished() and family could be advisable.

Sounds promising. I'll try that.

Aren't you trying to do something like this?
http://doc.trolltech.com/qq/qq16-fader.html
http://labs.trolltech.com/blogs/2007...from-the-past/

[/code]
Exactly . Thanks for the interesting links.

Thanks a lot

[wysota]

Well the problem shows up everytime the widget is resized while hidden.

The question is why would you want to resize a widget when it's hidden... it'd be a pure waste of cpu cycles.

[momesana]

The question is why would you want to resize a widget when it's hidden... it'd be a pure waste of cpu cycles.

Well, I don't. All I want is to have grabWidget() take this into consideration before taking the screenshot so it doesn't return outdated pixmaps or pixmaps whose size does not correspond to the actual current size of the widget :-). So I don't question Qt's policy of ignoring (rather postponing ...) such events when the widget is hidden, but the way grabWidget works. It should do whatever is necessary to return a pixmap that resembles the way the widget would look like if it was shown.

[wysota]

grabWidget() grabs the widget at its current state. Calling ensurePolished() might help, although it's a long shot. In general I'd try avoiding grabbing an invisible widget, if I were you. Remember that a widget only has a size when it is visible. In all other situations its size should be treated as undetermined. If you want a dirty hack, use this:

widget->show();
qApp->processEvents();
QPixmap px = QPixmap::grabWidget(widget);
widget->hide();
qApp->processEvents();

widget->show();
qApp->processEvents();
QPixmap px = QPixmap::grabWidget(widget);
widget->hide();
qApp->processEvents();

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