[PATCH] mouse wheel on desktop pager

[Scott Wheeler]

During a discussion today on #kde someone, while asking for the mouse wheel 
scrolling through desktops, was misunderstood as asking for mouse wheel support 
for the pager.  However, after a bit of contemplation, this seemed like a good 
compromise to the recent discussion on the matter (of whether or not to support 
Enlightenment-style mouse wheel support on the desktop).

Anyway, this patch makes the mouse wheel scroll through the desktops when used 
over the pager.  Any objections to this being committed to HEAD?

-Scott

p.s.  I don't have a network connection on my machine (just a friend's computer 
and a floppy drive ;-) ) where I'm staying (just at work and I tomorrow is a 
holiday) so this is a "normal" patch rather than a 'cvs diff'.  It's against 
kdebase/kicker/applets/minipager.

-------------- next part --------------
diff -Naur minipager-cvs/pagerapplet.cpp minipager/pagerapplet.cpp
--- minipager-cvs/pagerapplet.cpp	Wed May  8 22:07:34 2002
+++ minipager/pagerapplet.cpp	Wed May  8 22:01:25 2002
@@ -497,6 +497,21 @@
     updateGeometry();
 }
 
+void KMiniPager::wheelEvent( QWheelEvent* e )
+{
+    if( e->delta() < 0 ) {
+        // this could be "( curDesk - 1 ) + 1" for clarity, but that seems superfluous
+        const int next = curDesk % KWin::numberOfDesktops() + 1;
+        KWin::setCurrentDesktop( next );
+    }
+    else {
+        // again, a little ugly -- the addition of the number of desktops makes sure that we are
+        // not taking the modulo of a negative number and the "curDesk - 2" could be "curDesk - 1 - 1"
+        const int previous = ( KWin::numberOfDesktops() + curDesk - 2 ) % KWin::numberOfDesktops() + 1;
+        KWin::setCurrentDesktop( previous );
+    }
+}
+
 void KMiniPager::allocateButtons()
 {
     int i;
diff -Naur minipager-cvs/pagerapplet.h minipager/pagerapplet.h
--- minipager-cvs/pagerapplet.h	Wed May  8 22:07:34 2002
+++ minipager/pagerapplet.h	Wed May  8 21:07:32 2002
@@ -117,6 +117,7 @@
     void updateDesktopLayout(int,int,int);
     void popupDirectionChange( Direction d );
     void resizeEvent(QResizeEvent*);
+    void wheelEvent( QWheelEvent* e );
     void showKPager(bool toggleShow);
 
 protected slots: