--- a/flys-client/src/main/java/de/intevation/flys/client/client/ui/ParameterList.java	Fri Mar 25 11:51:54 2011 +0000
+++ b/flys-client/src/main/java/de/intevation/flys/client/client/ui/ParameterList.java	Sat Mar 26 18:07:41 2011 +0000
@@ -10,16 +10,21 @@
 import com.smartgwt.client.widgets.layout.HLayout;
 import com.smartgwt.client.widgets.layout.VLayout;
 
+import de.intevation.flys.client.shared.model.Artifact;
+import de.intevation.flys.client.shared.model.ArtifactDescription;
 import de.intevation.flys.client.shared.model.Data;
 import de.intevation.flys.client.shared.model.DataList;
 import de.intevation.flys.client.client.event.HasStepBackHandlers;
+import de.intevation.flys.client.client.event.HasStepForwardHandlers;
+import de.intevation.flys.client.client.event.ParameterChangeEvent;
+import de.intevation.flys.client.client.event.ParameterChangeHandler;
 import de.intevation.flys.client.client.event.StepBackEvent;
 import de.intevation.flys.client.client.event.StepBackHandler;
 
 
 public class ParameterList
 extends      VLayout
-implements   StepBackHandler
+implements   StepBackHandler, ParameterChangeHandler
 {
     protected CollectionView cView;
 
@@ -161,5 +166,37 @@
         old.clear();
         oldItems.removeMembers(oldItems.getMembers());
     }
+
+
+    /**
+     * Implements the onCollectionChange() method to do update the GUI after the
+     * parameterization has changed.
+     *
+     * @param event The ParameterChangeEvent.
+     */
+    public void onParameterChange(ParameterChangeEvent event) {
+        GWT.log("ParameterList.onParameterChange");
+
+        Artifact art             = event.getNewValue();
+        ArtifactDescription desc = art.getArtifactDescription();
+
+        DataList currentData = desc.getCurrentData();
+        if (currentData != null) {
+            // the user has to enter some attributes
+            String uiProvider   = currentData.getUIProvider();
+            UIProvider provider = UIProviderFactory.getProvider(uiProvider);
+
+            ((HasStepForwardHandlers) provider).addStepForwardHandler(cView);
+            ((HasStepBackHandlers) provider).addStepBackHandler(cView);
+
+            setCurrentData(currentData, provider);
+        }
+        else {
+            // we have reached a final state with no more user input
+            setCurrentData(null, null);
+        }
+
+        addOldDatas(desc.getOldData());
+    }
 }
 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :