[MeeGo-touch-dev] Emission of MOrientationChangeEvents has been optimized (i.e. reduced)

[Daniel d'Andrada]

Hi,

Until now whenever the orientation changes all QGraphicsItems in the 
scene were getting a MOrientationChangeEvent. This meant not only the 
items in the scene windows currently being rendered (scene window state 
== Appared, e.g. current page) were getting this signal but also all 
other items that reside in scene windows that are currently hidden (e.g. 
all pages in the back stack or pages from other tabs).

 From libmeegotouch 0.21.9-1 onwards (version not tagged yet) only items 
residing in scene windows whose state is different than Disappeared 
(e.g. items in the current page) will get MOrientationChangeEvent. When 
a disappeared scene window enters again the screen (leaves Disappeared 
state) its items will get MOrientationChangeEvent with the current 
orientation if they happen to have an outdated orientation. That 
optimization will happen only if your scene is being handled by a 
MSceneManager (such as in MApplicationWindow case). Barebone MWindows 
without a scene manager will still have all their items notified as usual.

No change is need in your application unless your code relies on having 
an MSceneManager *and* getting MOrientationChangeEvents for every single 
item in the scene whenever the orientation changes. We didn't spot any 
such use case so far.

Regards,
Daniel d'Andrada