gwenview2: event image is loaded

Hello,

I am doing the Exif patch (to display Exif information in fullscreen).
This time I will pack some more Exif information in a structure, so will
be more easy to add other Exif fields without create methods "in all
path". Also I see that will be easily possible to show this information
in other places (like photo information, on right side by default).

I can get the Exif information in Jpeg level, and I can _mainly_
transmit this information to MainWindow. I already added a label in Full
Screen OSD, etc.

I have a problem: first time that photo is loaded, I don't have the Exif
information available in the time that OSD menu is painted (other times
that photo is loaded yes). The reason, if I have understood correctly,
is that gwenview is using threads. 

I should write the Exif information when
LoadingDocumentImpl::slotImageLoaded is finished. But I don't see any
SLOT in MainWindow that is called after this one, this one is called
after other slots in MainWindow.

I have some ways to try to fix it:
-Send the label to LoadingDocumentImpl and write Exif information in
 this object (I don't like)
-LoadingDocumentImpl sends some signal that arrives in MainWindow and
 MainWindow writes Exif information
-your suggestions :-)

If I have time I will try to implement suggestion 2... but I wonder if
it is correct, in developers mind, etc. or if I am confusing something.

Thank you,

-- 
Carles Pina i Estany		GPG id: 0x8CBDAE64
	http://pinux.info	Manresa - Barcelona

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