* add a way to query if a visualization is already connected to a source

* don't do an immediate call using invokeMethod if the visualization is already connected and we're just adjusting it

svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=800383

datacontainer.cpp

@@ -104,6 +104,11 @@ void DataContainer::setNeedsUpdate(bool update)
     d->cached = update;
 }
 
+bool DataContainer::visualizationIsConnected(QObject *visualization) const
+{
+    return d->relayObjects.find(visualization) != d->relayObjects.constEnd();
+}
+
 void DataContainer::checkUsage()
 {
     if (d->relays.count() < 1 &&

datacontainer.h

@@ -101,6 +101,11 @@ class PLASMA_EXPORT DataContainer : public QObject
          **/
         void setNeedsUpdate(bool update = true);
 
+        /**
+         * @return true if the visualization is currently connected
+         */
+        bool visualizationIsConnected(QObject *visualization) const;
+
     public Q_SLOTS:
         /**
          * Check if the DataContainer is still in use.

dataengine.cpp

@@ -138,6 +138,12 @@ class DataEngine::Private
                 pollingInterval = pollingInterval - (pollingInterval % 50);
             }
 
+            if (immediateCall) {
+                // we don't want to do an immediate call if we are simply
+                // reconnecting
+                immediateCall = !s->visualizationIsConnected(visualization);
+            }
+
             s->connectVisualization(visualization, pollingInterval, align);
 
             if (immediateCall) {