--- a/flys-client/ChangeLog	Wed Sep 14 14:27:07 2011 +0000
+++ b/flys-client/ChangeLog	Wed Sep 14 14:35:10 2011 +0000
@@ -8,6 +8,15 @@
 
 2011-09-14	Felix Wolfsteller	<felix.wolfsteller@intevation.de> 
 
+	New DatacageTwinWidget to be used in W-Differences GUI.
+
+	* src/main/java/de/intevation/flys/client/client/ui/DatacagePairWidget.java:
+	  New, display two datacages and a "+" button. On selection and
+	  plus-button press will in future add names of selections into a
+	  given ListGrid.
+
+2011-09-14	Felix Wolfsteller	<felix.wolfsteller@intevation.de> 
+
 	Ease access to selected elements of a DatacageWidget. Make button-less
 	DatacageWidget possible.
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/flys-client/src/main/java/de/intevation/flys/client/client/ui/DatacagePairWidget.java	Wed Sep 14 14:35:10 2011 +0000
@@ -0,0 +1,142 @@
+package de.intevation.flys.client.client.ui;
+
+import de.intevation.flys.client.client.event.DatacageHandler;
+
+import com.google.gwt.core.client.GWT;
+
+import com.google.gwt.user.client.rpc.AsyncCallback;
+
+import com.smartgwt.client.util.SC;
+
+import com.smartgwt.client.widgets.Button;
+
+import com.smartgwt.client.widgets.tree.Tree;
+import com.smartgwt.client.widgets.tree.TreeGrid;
+import com.smartgwt.client.widgets.tree.TreeNode;
+
+import com.smartgwt.client.types.TreeModelType;
+
+import com.smartgwt.client.widgets.layout.VLayout;
+import com.smartgwt.client.widgets.layout.HLayout;
+
+import com.smartgwt.client.widgets.events.ClickHandler;
+import com.smartgwt.client.widgets.events.ClickEvent;
+
+import com.smartgwt.client.widgets.grid.ListGrid;
+import com.smartgwt.client.widgets.grid.ListGridRecord;
+
+import com.smartgwt.client.widgets.grid.events.RecordDoubleClickEvent;
+import com.smartgwt.client.widgets.grid.events.RecordDoubleClickHandler;
+
+import de.intevation.flys.client.shared.model.Artifact;
+import de.intevation.flys.client.shared.model.User;
+import de.intevation.flys.client.shared.model.ToLoad;
+
+import de.intevation.flys.client.client.FLYSConstants;
+import de.intevation.flys.client.client.Config;
+
+import de.intevation.flys.client.client.services.MetaDataService;
+import de.intevation.flys.client.client.services.MetaDataServiceAsync;
+
+import de.intevation.flys.client.shared.model.DataCageTree;
+import de.intevation.flys.client.shared.model.DataCageNode;
+import de.intevation.flys.client.shared.model.AttrList;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Stack;
+
+public class DatacagePairWidget
+extends      VLayout
+{
+    protected FLYSConstants messages =
+        GWT.create(FLYSConstants.class);
+
+    /** The "remote" ListGrid to insert data to when add-button is clicked. */
+    protected ListGrid grid; 
+
+    /** First attribute-name for StringPairRecord. */
+    protected static final String ATTRIBUTE_FIRST  = "first";
+
+    /** Second attribute-name for StringPairRecord. */
+    protected static final String ATTRIBUTE_SECOND = "second";
+
+    /** First (upper) DataCage Grid. */
+    protected DatacageWidget firstDatacageWidget;
+
+    /** Second (lower) DataCage Grid. */
+    protected DatacageWidget secondDatacageWidget;
+
+
+    /**
+     * Two strings to be displayed in a GridList.
+     */
+    protected class StringPairRecord extends ListGridRecord {
+        public StringPairRecord() {
+        }
+
+        public StringPairRecord(String first, String second) {
+            setFirst(first);
+            setSecond(second);
+        }
+
+
+        public void setFirst(String first) {
+            setAttribute(ATTRIBUTE_FIRST, first);
+        }
+
+
+        public void setSecond(String second) {
+            setAttribute(ATTRIBUTE_SECOND, second);
+        }
+    }
+
+
+    /**
+     *
+     * @param artifact Artifact to query datacage with.
+     * @param user     User to query datacage with.
+     * @param outs     outs to query datacage with.
+     * @param grid     Grid into which to insert selection of pairs.
+     */
+    public DatacagePairWidget(Artifact artifact, User user, String outs,
+            ListGrid grid) {
+        this.grid = grid;
+
+        HLayout hLayout = new HLayout();
+
+        firstDatacageWidget = new DatacageWidget(artifact, user, outs, false);
+        hLayout.addMember(firstDatacageWidget);
+        secondDatacageWidget = new DatacageWidget(artifact, user, outs, false);
+        hLayout.addMember(secondDatacageWidget);
+
+        // TODO: i18n + icon
+        Button plusBtn = new Button("+");
+        plusBtn.addClickHandler(new ClickHandler() {
+            @Override
+            public void onClick(ClickEvent event) {
+                plusClicked();
+            }
+        });
+
+        addMember(hLayout);
+        addMember(plusBtn);
+    }
+
+
+    /**
+     * Callback for add-button.
+     * Fires to load for every selected element and handler.
+     */
+    public void plusClicked() {
+        ToLoad toLoad1 = firstDatacageWidget.getSelection();
+        ToLoad toLoad2 = secondDatacageWidget.getSelection();
+
+        if (toLoad1 == null || toLoad2 == null) {
+            return;
+        }
+
+        //grid.addData(new StringPairRecord((String)toLoad1.getKeys().toArray()[0], (String)toLoad2.getKeys().toArray()[0]));
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :