plasma apps and screen information

[Guillaume Pothier]

2008/10/23 Aaron J. Seigo <aseigo at kde.org>:
> On Wednesday 22 October 2008, Guillaume Pothier wrote:
>> Just tell me if you want me to go ahead.
>
> please do =)

Ok, here comes the patch. In summary:
- Added three methods to Corona:
   int numScreens()
   QRect screenGeometry(int)
   QRect availableScreenGeometry(int)
The latter should probably return a QRegion instead, according to what
you said about toolbox placement.
- QDesktopWidget is not used anymore in libplasma, entirely replaced
by calls to the new Corona methods.
- Added Corona* parameter to Plasma::popupPosition
- Added a corona() method to Plasma::Applet. This is needed for calls
to Plasma::popupPosition.
- Also added a corona() method to Plasma::View for consistency's sake.
- Corona is friends with ToolTipManager, as ToolTipManager needs to
call Plasma::popupPosition and thus needs a Corona. Thus, Corona
registers itself with the ToolTipManager. I think this is the ugliest
part of the patch, please tell me if there is a better solution.
- Added a ViewerCorona class to plasmoidviewer, as Plasma::Corona is
now has pure virtual methods.

Ok to commit?
g
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