Non client area painting with Qt

[rajendrant]

Dear Qt Developers/Experts

My goal is to draw tabbar in titlebar (only in Windows) similar to firefox/chrome.
I am using some DWM apis to achieve that as mentioned in http://msdn.microsoft.com/en-us/library/windows/desktop/bb688195%28v=vs.85%29.aspx
Basically I make the entire area as nonclientarea and tabbar is drawn at the top automatically.

I know these DWM apis only work with Windows Aero enabled, and I am fine with tabbar not shown in titlebar with DWM disabled.

I am facing two issues.
1. When the application is maximized, part of the left, top window portion gets clipped. See the attached image.
2. If I enable 'Auto hide taskbar' property in Windows, I would expect the taskbar to popup when mouse is moved down near the taskbar with application maximized. That is not happening as well.

I have attached a sample project that creates the issue.
Can somebody help with this.
Any suggestions are welcome.

I can perfectly solve issue (1) with setContentsMargins() if I know the exact amount of pixels that are being clipped.

Thanks
Rajendran

[rajendrant]

Dear All,

I managed to fix aforementioned issues (at least in Qt4.8.5) and attaching working project.

9382

Our project QuTTY (http://code.google.com/p/qutty/) also uses this technique to provide tabs in titlebar similar to Google Chrome.

However, Qt5.1.0 has some issues with left, bottom sides of the mainwindow geometry getting reduced.

Thanks
Rajendran

[Ivan Rodríguez]

Hi Rajendran,

It is a bit old, but I have a question. Is it possible to get this DWM API working without Aero enabled? The documentation says nothing about it.

Thanks.

Ivan RodrÃ*guez.