Send ComboBox selection with RPC (#19929)

Send the selection from the client to the server with RPC.

Change-Id: Ic32d869c3dc2a8806f9c7cfd1f3db8263a5379a9

client/src/com/vaadin/client/ui/VFilterSelect.java

@@ -1631,7 +1631,7 @@ public class VFilterSelect extends Composite implements Field, KeyDownHandler,
 
         if (!(newKey.equals(selectedOptionKey) || ("".equals(newKey) && selectedOptionKey == null))) {
             selectedOptionKey = newKey;
-            connector.sendSelection(new String[] { selectedOptionKey });
+            connector.sendSelection(selectedOptionKey);
             afterUpdateClientVariables();
 
             // currentPage = -1; // forget the page

client/src/com/vaadin/client/ui/combobox/ComboBoxConnector.java

@@ -396,10 +396,9 @@ public class ComboBoxConnector extends AbstractFieldConnector implements
      * @since
      */
     public void requestFirstPage() {
+        sendSelection(null);
         getConnection().updateVariable(getConnectorId(), "filter", "", false);
-        getConnection().updateVariable(getConnectorId(), "page", 0, false);
-        getConnection().updateVariable(getConnectorId(), "selected",
-                new String[] {}, immediate);
+        getConnection().updateVariable(getConnectorId(), "page", 0, true);
     }
 
     /**
@@ -432,9 +431,8 @@ public class ComboBoxConnector extends AbstractFieldConnector implements
      * @param selection
      *            the current selection
      */
-    public void sendSelection(String[] selection) {
-        getConnection().updateVariable(getConnectorId(), "selected", selection,
-                immediate);
+    public void sendSelection(String selection) {
+        rpc.setSelectedItem(selection);
     }
 
     /**

server/src/com/vaadin/ui/ComboBox.java

@@ -89,6 +89,20 @@ public class ComboBox extends AbstractSelect implements
                 }
             }
         }
+
+        @Override
+        public void setSelectedItem(String item) {
+            if (item == null) {
+                setValue(null, true);
+            } else {
+                final Object id = itemIdMapper.get(item);
+                if (id != null && id.equals(getNullSelectionItemId())) {
+                    setValue(null, true);
+                } else {
+                    setValue(id, true);
+                }
+            }
+        }
     };
 
     FocusAndBlurServerRpcImpl focusBlurRpc = new FocusAndBlurServerRpcImpl(this) {
@@ -253,8 +267,7 @@ public class ComboBox extends AbstractSelect implements
 
             boolean nullFilteredOut = isFilteringNeeded();
             // null option is needed and not filtered out, even if not on
-            // current
-            // page
+            // current page
             boolean nullOptionVisible = needNullSelectOption
                     && !nullFilteredOut;
 
@@ -721,29 +734,6 @@ public class ComboBox extends AbstractSelect implements
         // Not calling super.changeVariables due the history of select
         // component hierarchy
 
-        // Selection change
-        if (variables.containsKey("selected")) {
-            final String[] ka = (String[]) variables.get("selected");
-
-            // Single select mode
-            if (ka.length == 0) {
-
-                // Allows deselection only if the deselected item is visible
-                final Object current = getValue();
-                final Collection<?> visible = getVisibleItemIds();
-                if (visible != null && visible.contains(current)) {
-                    setValue(null, true);
-                }
-            } else {
-                final Object id = itemIdMapper.get(ka[0]);
-                if (id != null && id.equals(getNullSelectionItemId())) {
-                    setValue(null, true);
-                } else {
-                    setValue(id, true);
-                }
-            }
-        }
-
         String newFilter;
         if ((newFilter = (String) variables.get("filter")) != null) {
             // this is a filter request

server/tests/src/com/vaadin/tests/server/components/ComboBoxValueChangeTest.java

@@ -1,8 +1,8 @@
 package com.vaadin.tests.server.components;
 
-import java.util.HashMap;
-import java.util.Map;
-
+import com.vaadin.server.ServerRpcManager;
+import com.vaadin.server.ServerRpcMethodInvocation;
+import com.vaadin.shared.ui.combobox.ComboBoxServerRpc;
 import com.vaadin.ui.AbstractField;
 import com.vaadin.ui.ComboBox;
 
@@ -16,16 +16,28 @@ public class ComboBoxValueChangeTest extends
         AbstractFieldValueChangeTestBase<Object> {
     @Override
     protected void setUp() throws Exception {
-        ComboBox combo = new ComboBox();
+        ComboBox combo = new ComboBox() {
+            @Override
+            public String getConnectorId() {
+                return "id";
+            }
+        };
         combo.addItem("myvalue");
         super.setUp(combo);
     }
 
     @Override
     protected void setValue(AbstractField<Object> field) {
-        Map<String, Object> variables = new HashMap<String, Object>();
-        variables.put("selected", new String[] { "myvalue" });
-        ((ComboBox) field).changeVariables(field, variables);
+        ComboBox combo = (ComboBox) field;
+        ServerRpcMethodInvocation invocation = new ServerRpcMethodInvocation(
+                combo.getConnectorId(), ComboBoxServerRpc.class,
+                "setSelectedItem", 1);
+        invocation.setParameters(new Object[] { "myvalue" });
+        try {
+            ServerRpcManager.applyInvocation(combo, invocation);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
     }
 
 }

shared/src/com/vaadin/shared/ui/combobox/ComboBoxServerRpc.java

@@ -31,4 +31,12 @@ public interface ComboBoxServerRpc extends ServerRpc {
      *            user entered string value for the new item
      */
     public void createNewItem(String itemValue);
+
+    /**
+     * Set the current selection.
+     * 
+     * @param item
+     *            the id of a single item or null to deselect the current value
+     */
+    public void setSelectedItem(String item);
 }