move dashboard elements and store the order

pdb-ui/src/main/java/org/lucares/pdbui/dashboard/BaseDashboardWidget.java

@@ -1,7 +1,11 @@
 package org.lucares.pdbui.dashboard;
 
+import java.util.UUID;
+
 public abstract class BaseDashboardWidget {
 
+    private String id = UUID.randomUUID().toString();
+
     private DashboardWidgetType type;
 
     private DashboardWidgetSize size;
@@ -15,6 +19,14 @@ public abstract class BaseDashboardWidget {
         this.size = size;
     }
 
+    public String getId() {
+        return id;
+    }
+
+    public void setId(final String id) {
+        this.id = id;
+    }
+
     public DashboardWidgetType getType() {
         return type;
     }

pdb-ui/src/main/java/org/lucares/pdbui/dashboard/Dashboard.java

@@ -24,6 +24,8 @@ public class Dashboard {
 
     private List<PlotWidget> plots = new ArrayList<>();
 
+    private List<List<String>> arrangement = new ArrayList<>();
+
     public Dashboard() {
         super();
 
@@ -77,4 +79,12 @@ public class Dashboard {
     public List<PlotWidget> getPlots() {
         return plots;
     }
+
+    public List<List<String>> getArrangement() {
+        return arrangement;
+    }
+
+    public void setArrangement(final List<List<String>> arrangement) {
+        this.arrangement = arrangement;
+    }
 }