[iOS] How does MyGUI know about RenderWindow resizing?

I have same code running on win32 and iOS. In win32, if I resize the window my GUI components sit at the same position or move properly depending if they are absolutely or relatively positioned.

On iOS when I rotate the device, this doesn't happen. It looks like MyGUI is still rendering to a 1024x768 window, which has been stretched to 768x1024 (landscape VS portrait mode on iPad 2).

I wonder how MyGUI knows about the render-window dimensions to resize things properly, so that I can try to reuse/call this logic on iOS. I'm not asking for advice on iOS - though if anyone knows, please share - just how MyGUI works.

Thanks.

This is done from platform code. MyGUI.OgrePlatform in your case.
MyGUI::OgreRenderManager listens for
virtual void windowResized(Ogre::RenderWindow* _window)that comes from one of those
public Ogre::WindowEventListener,
public Ogre::RenderQueueListener,
public Ogre::RenderSystem::Listener
Check OgreRenderManager::windowResized method and other places where OGRE_NO_VIEWPORT_ORIENTATIONMODE used. There is some logic related to device orientation. May be it was broken or changed after some version updates.

Thanks, this makes sense - it seems Ogre::WindowEventListener doesn't get used on Ogre iOS.

Should I be trying to call OgreRenderManager::windowResized() myself, if I write some code to detect orientation change, to 'trick' MyGUI into updating?

Yes, changing Ogre.Platform or manually calling windowResized would do the trick.
May be that code that is already in MyGUI works only for Ogre on Android, but I remember that it worked before.

In linked thread in main forum: http://www.ogre3d.org/forums/viewtopic.php?f=21&t=79181

Definitely no windowResized event happens on iOS, so if MyGUI relies on this it won't work A viewport listener should be notified, but MyGUI doesn't use that... I don't know about the other event handlers types you mentioned.

If I get a workaround which doesn't require any MyGUI changes, I'll post it here.