tree model and selection model for tree visualization of currently tracked events/regattas/races

java/com.sap.sailing.gwt.ui/src/com/sap/sailing/gwt/ui/client/EventManagementPanel.java

@@ -17,6 +17,7 @@ import com.google.gwt.event.dom.client.KeyUpHandler;
 import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
 import com.google.gwt.user.cellview.client.CellList;
 import com.google.gwt.user.cellview.client.CellTable;
+import com.google.gwt.user.cellview.client.CellTree;
 import com.google.gwt.user.cellview.client.Column;
 import com.google.gwt.user.cellview.client.ColumnSortEvent.Handler;
 import com.google.gwt.user.cellview.client.ColumnSortEvent.ListHandler;
@@ -75,7 +76,7 @@ public class EventManagementPanel extends FormPanel {
         this.setWidget(verticalPanel);
         verticalPanel.setSize("100%", "100%");
         
-        Grid grid = new Grid(9, 2);
+        Grid grid = new Grid(10, 2);
         verticalPanel.add(grid);
         verticalPanel.setCellWidth(grid, "100%");
         
@@ -244,13 +245,19 @@ public class EventManagementPanel extends FormPanel {
                 sb.appendEscaped(value.name);
             }
         };
+
+        eventsList = new ListDataProvider<EventDAO>();
+
+        TrackedEventsTreeModel trackedEventsModel = new TrackedEventsTreeModel(eventsList);
+        final CellTree eventsCellTree = new CellTree(trackedEventsModel, trackedEventsModel.getRoot());
+        grid.setWidget(8, 0, eventsCellTree);
+        
         final CellList<EventDAO> eventsCellList = new CellList<EventDAO>(eventCell);
-        grid.setWidget(8, 0, eventsCellList);
+        grid.setWidget(9, 0, eventsCellList);
         grid.getCellFormatter().setHeight(6, 0, "100%");
         eventsCellList.setWidth("100%");
         eventsCellList.setVisibleRange(0, 5);
         eventsCellList.setSelectionModel(new MultiSelectionModel<EventDAO>() {});
-        eventsList = new ListDataProvider<EventDAO>();
         eventsList.addDataDisplay(eventsCellList);
         
         Button btnRemove = new Button("Remove");

java/com.sap.sailing.gwt.ui/src/com/sap/sailing/gwt/ui/client/TrackedEventsTreeModel.java

@@ -0,0 +1,84 @@
+package com.sap.sailing.gwt.ui.client;
+
+import com.google.gwt.cell.client.AbstractCell;
+import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
+import com.google.gwt.view.client.ListDataProvider;
+import com.google.gwt.view.client.MultiSelectionModel;
+import com.google.gwt.view.client.TreeViewModel;
+import com.sap.sailing.gwt.ui.shared.EventDAO;
+import com.sap.sailing.gwt.ui.shared.RaceDAO;
+import com.sap.sailing.gwt.ui.shared.RegattaDAO;
+
+public class TrackedEventsTreeModel implements TreeViewModel {
+    private final String root = "Events";
+    
+    private MultiSelectionModel<?> selectionModel;
+    
+    private final ListDataProvider<EventDAO> events;
+    
+    public TrackedEventsTreeModel(ListDataProvider<EventDAO> eventsList) {
+        this.events = eventsList;
+        selectionModel = new MultiSelectionModel<Object>();
+    }
+    
+    @SuppressWarnings("unchecked")
+    private <T> MultiSelectionModel<T> getSelectionModel() {
+        return (MultiSelectionModel<T>) selectionModel;
+    }
+
+    @Override
+    public <T> NodeInfo<?> getNodeInfo(T value) {
+        if (value == root) {
+            return new DefaultNodeInfo<EventDAO>(events, new EventCell(),
+                    getSelectionModel(), /* valueUpdater */ null);
+        } else if (value instanceof EventDAO) {
+            return new DefaultNodeInfo<RegattaDAO>(new ListDataProvider<RegattaDAO>(((EventDAO) value).regattas), new RegattaCell(),
+                    getSelectionModel(), /* valueUpdater */ null);
+        } else if (value instanceof RegattaDAO) {
+            return new DefaultNodeInfo<RaceDAO>(new ListDataProvider<RaceDAO>(((RegattaDAO) value).races), new RaceCell(),
+                    getSelectionModel(), /* valueUpdater */ null);
+        } else if (value instanceof RaceDAO) {
+            return null; // TODO do we need to return something more "useful" here?
+        } else {
+            throw new RuntimeException("Unknown object type in event tree: "+value+" ("+value.getClass().getName()+")");
+        }
+    }
+
+    @Override
+    public boolean isLeaf(Object value) {
+        if (value == root) {
+            return false;
+        } else if (value instanceof EventDAO) {
+            return false;
+        } else if (value instanceof RegattaDAO) {
+            return ((RegattaDAO) value).races.isEmpty();
+        } else {
+            return true;
+        }
+    }
+
+    public Object getRoot() {
+        return root;
+    }
+
+    private class EventCell extends AbstractCell<EventDAO> {
+        @Override
+        public void render(com.google.gwt.cell.client.Cell.Context context, EventDAO value, SafeHtmlBuilder sb) {
+            sb.appendEscaped(value.name);
+        }
+    }
+
+    private class RegattaCell extends AbstractCell<RegattaDAO> {
+        @Override
+        public void render(com.google.gwt.cell.client.Cell.Context context, RegattaDAO value, SafeHtmlBuilder sb) {
+            sb.appendEscaped(value.boatClass.name);
+        }
+    }
+
+    private class RaceCell extends AbstractCell<RaceDAO> {
+        @Override
+        public void render(com.google.gwt.cell.client.Cell.Context context, RaceDAO value, SafeHtmlBuilder sb) {
+            sb.appendEscaped(value.name);
+        }
+    }
+}

java/com.sap.sailing.gwt.ui/src/com/sap/sailing/gwt/ui/shared/EventDAO.java

@@ -1,15 +1,17 @@
 package com.sap.sailing.gwt.ui.shared;
 
+import java.util.List;
+
 import com.google.gwt.user.client.rpc.IsSerializable;
 
 public class EventDAO implements IsSerializable {
     public String name;
-    public Iterable<RegattaDAO> regattas;
-    public Iterable<CompetitorDAO> competitors;
+    public List<RegattaDAO> regattas;
+    public List<CompetitorDAO> competitors;
     
     public EventDAO() {}
     
-    public EventDAO(String name, Iterable<RegattaDAO> regattas, Iterable<CompetitorDAO> competitors) {
+    public EventDAO(String name, List<RegattaDAO> regattas, List<CompetitorDAO> competitors) {
         super();
         this.name = name;
         this.regattas = regattas;

java/com.sap.sailing.gwt.ui/src/com/sap/sailing/gwt/ui/shared/RegattaDAO.java

@@ -1,14 +1,16 @@
 package com.sap.sailing.gwt.ui.shared;
 
+import java.util.List;
+
 import com.google.gwt.user.client.rpc.IsSerializable;
 
 public class RegattaDAO implements IsSerializable {
     public BoatClassDAO boatClass;
-    public Iterable<RaceDAO> races;
+    public List<RaceDAO> races;
     
     public RegattaDAO() {}
 
-    public RegattaDAO(BoatClassDAO boatClass, Iterable<RaceDAO> races) {
+    public RegattaDAO(BoatClassDAO boatClass, List<RaceDAO> races) {
         super();
         this.boatClass = boatClass;
         this.races = races;