allow setting of the disk cache size; init it to "no limit", so we can see how that puppy grows with time

svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=872362

theme.cpp

@@ -65,6 +65,7 @@ public:
           useGlobal(true),
           hasWallpapers(false)
     {
+        pixmapCache.setCacheLimit(0);
         generalFont = QApplication::font();
     }
 
@@ -531,6 +532,11 @@ void Theme::invalidateRectsCache(const QString& image)
     imageGroup.deleteGroup();
 }
 
+void Theme::setCacheLimit(int kbytes)
+{
+    d->pixmapCache.setCacheLimit(kbytes);
+}
+
 }
 
 #include <theme.moc>

theme.h

@@ -192,6 +192,16 @@ class PLASMA_EXPORT Theme : public QObject
          **/
         void insertIntoCache(const QString& key, const QPixmap& pix);
 
+        /**
+         * Sets the maximum size of the cache (in kilobytes). If cache gets bigger
+         * the limit then some entries are removed
+         * Setting cache limit to 0 disables automatic cache size limiting.
+         *
+         * Note that the cleanup might not be done immediately, so the cache might
+         *  temporarily (for a few seconds) grow bigger than the limit.
+         **/
+        void setCacheLimit(int kbytes);
+
         bool findInRectsCache(const QString &image, const QString &element, QRectF &rect) const;
         void insertIntoRectsCache(const QString& image, const QString &element, const QRectF &rect);
         void invalidateRectsCache(const QString& image);