Hi. The methods setWindowIcon are not yet implemented in Qt5. That concerns QWindow, QWidget and QApplication.
I guess the reason for that is that QIcon is part of QtWidget and not QtGui. QIcon seems not movable, it use a lot of QWidget styles stuffs For that reason the not-implemented QWindow::setWindowIcon ( as well as QPlatformWindow::setWindowIcon) take a QImage as parameter. So it will only use one image for all sizes the system required, and icon will certainly look ugly as they are upscale/downscale too much. For that reason I think we need something like a QWindowIcon or a QApplicationIcon to stores a different QImage for different size. It's a sub-optimal solution, because the setWindowIcon will have different signature in QtGui and QtWidget. So .. Can you think of something better ? What should be the features & api of QWindow Icon. ? Is it still time for this change in 5.0 ? or should we wait 5.1 ? I think in both case, we have to start using it privately if we want keep QWidget::setWindowIcon working. This change is mostly required for linux, since windows will use the icon provided by the RC file and Mac using the one declared by Info.plist. I worked on a small ugly change about this issue https://codereview.qt-project.org/#change,25373 , just to see what would need to be done. Sincerely, Corentin Jabot. _______________________________________________ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development