How to set Orientation(Portrait/Lanscape) of Qt app ?

[sumitsasken]

Hi
I am running my Qt app on 5800, I need to set orientation of my Qt app to portrait irrespective of device's orientation. For this I used setOrientation(Qt::Vertical), but no use.

Please help me to find out how we can do it.

Thanks in advance
Sumit

[niemi23]

Hi,

Qt originally being developed for desktop use, I'm not sure if the current API provides support for such a thing at all. Hopefully someone will correct me if I'm wrong here.

There is an example application in the Wiki which shows a workaround:

http://wiki.forum.nokia.com/index.ph...ower_of_S60_Qt

Here's a piece of code from its main.cpp:

// lock orientation
CAknAppUi* appUi = dynamic_cast<CAknAppUi*>(CEikonEnv::Static()->AppUi());
if(appUi){
appUi->SetOrientationL(CAknAppUi::EAppUiOrientationPortrait);
}

I haven't actually tried whether that works as expected, but I guess it's worth a try Perhaps this kind of functionality will be made available in a proper way in the Mobile Extensions package one day...

Cheers,

- Petri

[axeljaeger]

I use this snipped in all of my test programms. It works. However, add some includes:

#include <eikenv.h>
#include <eikappui.h>
#include <aknenv.h>
#include <aknappui.h>

[savaj]

I am running my Qt app on 5800, I need to set orientation of my Qt app to portrait irrespective of device's orientation. For this I used setOrientation(Qt::Vertical), but no use.

setOrientation(Qt::Vertical) of which class?? i dont think any Qt specific class have that function.


As said by niemi23, CAknAppUi::SetOrientationL() API of symbian is working fine.

[markboost]

A reminder to the folks coding in Qt: The SetOrientationL call needs to be surrounded by some sort of TRAP, most commonly a QT_TRAP_THROWING.

Hi,

Qt originally being developed for desktop use, I'm not sure if the current API provides support for such a thing at all. Hopefully someone will correct me if I'm wrong here.

There is an example application in the Wiki which shows a workaround:

http://wiki.forum.nokia.com/index.ph...ower_of_S60_Qt

Here's a piece of code from its main.cpp:

// lock orientation
CAknAppUi* appUi = dynamic_cast<CAknAppUi*>(CEikonEnv::Static()->AppUi());
if(appUi){
appUi->SetOrientationL(CAknAppUi::EAppUiOrientationPortrait);
}

I haven't actually tried whether that works as expected, but I guess it's worth a try Perhaps this kind of functionality will be made available in a proper way in the Mobile Extensions package one day...

Cheers,

- Petri

[axeljaeger]

Can you give a complete piece of code? Yesterday I tried to compile an application that uses such calls to lock orientation agains Qt 4.6.0. The app crashes in that call. It did not crash with the 4.5 tech preview. May it work again with this trap added?

[treinio]

CS001517 - Lock application orientation in Qt for Symbian

[axeljaeger]

Thank you, it works again.

[markboost]

I've experimented with the SetOrientationL interface a bit. It works somewhat raggedly on the emulator, but pretty robustly on a real N97. I can switch between portrait and landscape and back, contradicting the "advice" from the accelerometers. I find, though, that once it's been set to portrait or landscape, setting "Automatic" or "Unspecified" does not appear to restore accelerometer-based selection.

[markboost]

I apparently spoke too soon. On an N97, if you switch back and forth between landscape and portrait a (random) number of times (I'd say anywhere between 5 and 15), the touch screen slowly becomes less and less sensitive, until eventually it won't honor any of your buttons (though the Exit button still seems as sensitive as ever).

This seems to happen, though, even if you just auto-rotate the screen a bunch of times, although I can't reproduce that behavior with another toy application I have, so I suppose it could somehow relate to my screen switching lashup.