add a getter and a Q_PROPERTY for the caching setting

svn path=/trunk/KDE/kdelibs/; revision=967619

wallpaper.cpp

@@ -298,6 +298,11 @@ void Wallpaper::setUsingDiskCache(bool useCache)
     d->cacheRendering = useCache;
 }
 
+bool Wallpaper::usingDiskCache() const
+{
+    return d->cacheRendering;
+}
+
 void Wallpaper::setResizeMethodHint(Wallpaper::ResizeMethod resizeMethod)
 {
     d->lastResizeMethod = resizeMethod;

wallpaper.h

@@ -60,6 +60,7 @@ class PLASMA_EXPORT Wallpaper : public QObject
     Q_PROPERTY(QString icon READ icon)
     Q_PROPERTY(KServiceAction renderingMode READ renderingMode)
     Q_PROPERTY(QList<KServiceAction> listRenderingModes READ listRenderingModes)
+    Q_PROPERTY(bool usingDiskCache READ usingDiskCache WRITE setUsingDiskCache)
 
     public:
         /**
@@ -398,6 +399,11 @@ class PLASMA_EXPORT Wallpaper : public QObject
          */
         void setUsingDiskCache(bool useCache);
 
+        /**
+         * @return true if the wallpaper is using disk caching for render results
+         */
+        bool usingDiskCache() const;
+
         /**
          * Tries to load pixmap with the specified key from cache.
          *