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On Friday, December 31, 2010, J Janz wrote:
> Also, if I got it right from your answer, I still couldn't make it right
> now even with a DataEngine/Service, because I wouldn't have a widget,
> right?

there are probably a number of ways to do it; right now with the tooltip=20
widgets the window manager paints the thumbnail there directly within the=20
coordinates given since it already has the pixmap available and knows when =
to=20
update it.

with a plasmoid, it is possible to find every view (which is a QWidget) tha=
t=20
displaying that plasmoid and map the coordinates of the plasmoid to the=20
coordinates of that widget (and then to global screen coordinates). that's =
not=20
very hard at all. in fact, the plasmoid itself can knows it geometry in sce=
ne=20
coordinates with QGraphicsItem::mapToScene(..). this returns a QPolygonF,=20
since the item may be transformed on the screen.

with that region, it is then easy enough to find out what the screen=20
coordinates are based on the view's offset onto the scene (mapFromScene(..)=
)=20
and where the view is on screen (getting the bounding rect of the region an=
d=20
using QWidget::mapToGlobal(..))

to support rotation, kwin would also need to know what the rotation in=20
QGraphicsItem::transorm() is so it knows which way the polygon is oriented.=
=20
with that info, kwin should be able to paint thumbails pretty much anywhere=
=20
requested.

right now, without touching kwin, only non-rotated thumbnails are possible.=
=20
that would be a useful start, though, and once that is working we can add=20
rotation to kwin's thumbnail painting perhaps.

kwin's thumbnail painting is triggered using=20
Plasma::WindowEffects::showWindowThumbnails. what isn't good in there right=
=20
now is that it sets an X atom on the window, meaning that only one set of=20
window thubnails per view would currently be painted. so two copies of your=
=20
plasmoid on the same containment wouldn't work right now; that would need s=
ome=20
work, but that is, again, another improvement that could be made once the=20
basics are working.

so to start with, a Service in the Tasks DataEngine which uses=20
Plasma::WindowEffects to get thumbnails for a window onto a given screen co=
ord=20
should be enough to get this started.

=2D-=20
Aaron J. Seigo
humru othro a kohnu se
GPG Fingerprint: 8B8B 2209 0C6F 7C47 B1EA  EE75 D6B7 2EB1 A7F1 DB43

KDE core developer sponsored by Qt Development Frameworks

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