I find this docs in Microsoft, but they use C#. I don't know If Qt can do the same as them?

Microsoft Title bar

9035dd12-20d8-40d1-8733-563f3ae7d060-image.png

@mcf1lmnfs No, because title bar is not a Qt element, is system made, so I cannot change it via Qt Style Sheets.

Hi
I have not seen steam on linux , however they might have use
https://en.wikipedia.org/wiki/Client-side_decoration
or something similar.
or have hand made it.
While this works ok for win
https://github.com/dfct/TrueFramelessWindow
I have not seen one for linux. Maybe due to all the different managers.

Short story is. Qt do not draw the title bar so one can either totally fake it and draw all - and handle all min/max resize etc by
manual code or if the Desktop/Manager supports it, use direct api extensions.

@SGaist I tried the Qt 5.12.6 and it did the trick! Thanks.

But interestingly, the title of the main application is no longer scaled by "Make text bigger" setting but the dockwidget ones does. I guess that there is an intention not to scale the main title. "Make everything bigger" setting does scale everything properly now except the titlebar height of only the main application looks not enough for the enlarged font size. I will give qt5.14 a try as well.

@p3c0 said:

Window {
flags: Qt.FramelessWindowHint
}

Thanks
it works.

Update: I managed to get a QWindow involved into the code, yet the toolbar is messed up.
Screenshot

New code:

void Test::createFancyMacWindow() { QWindow* w = new QWindow(); NSView* mainWindowNSView = (NSView*) w->winId(); NSWindow* window = [mainWindowNSView window]; NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; // move toolbar where the titlebar used to be [window setTitleVisibility: NSWindowTitleHidden]; // Adjust Cocoa layouts NSView *contentView = [window contentView]; [contentView setAutoresizesSubviews:YES]; QMacNativeWidget *nativeWidget = new QMacNativeWidget(contentView); //nativeWidget->move(0, 0); nativeWidget->setPalette(QPalette(Qt::red)); nativeWidget->setAutoFillBackground(true); NSView *nativeWidgetView = nativeWidget->nativeView(); [contentView addSubview:nativeWidgetView positioned:NSWindowAbove relativeTo:nil]; [nativeWidgetView setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable]; [nativeWidgetView setAutoresizesSubviews:YES]; nativeWidget->show(); // Show the window. [window makeKeyAndOrderFront:window]; [pool release]; QMacToolBar *toolBar = new QMacToolBar(); toolBar->addItem(QIcon(), QStringLiteral("Helloooo")); toolBar->attachToWindow(w); [window setToolbar: toolBar->nativeToolbar()]; w->show(); }