vaadin-framework/uitest/src/com/vaadin/tests/UsingCustomNewItemHandlerInSelect.java

/* 
 * Copyright 2000-2014 Vaadin Ltd.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.vaadin.tests;

import java.util.Random;

import com.vaadin.data.Item;
import com.vaadin.ui.AbstractSelect;
import com.vaadin.ui.CustomComponent;
import com.vaadin.ui.Panel;
import com.vaadin.ui.Select;
import com.vaadin.ui.VerticalLayout;

public class UsingCustomNewItemHandlerInSelect extends CustomComponent {

    private final Select select = new Select();

    public static Random random = new Random(1);

    private static int sequence = 0;

    public UsingCustomNewItemHandlerInSelect() {

        VerticalLayout pl = new VerticalLayout();
        pl.setMargin(true);
        final Panel panel = new Panel("Select demo", pl);
        pl.addComponent(select);

        select.setCaption("Select component");
        select.setImmediate(true);
        select.addContainerProperty("CAPTION", String.class, "");
        select.setItemCaptionMode(Select.ITEM_CAPTION_MODE_PROPERTY);
        select.setItemCaptionPropertyId("CAPTION");
        select.setNewItemsAllowed(true);
        select.setNewItemHandler(new MyNewItemHandler());

        populateSelect();

        setCompositionRoot(panel);
    }

    public void populateSelect() {
        final String[] names = new String[] { "John", "Mary", "Joe", "Sarah",
                "Jeff", "Jane", "Peter", "Marc", "Josie", "Linus" };
        for (int j = 0; j < 4; j++) {
            Integer id = new Integer(sequence++);
            Item item = select.addItem(id);
            item.getItemProperty("CAPTION").setValue(
                    id.toString() + ": "
                            + names[random.nextInt() % names.length]);
        }
    }

    public class MyNewItemHandler implements AbstractSelect.NewItemHandler {
        @Override
        public void addNewItem(String newItemCaption) {
            // here could be db insert or other backend operation
            Integer id = new Integer(sequence++);
            Item item = select.addItem(id);
            item.getItemProperty("CAPTION").setValue(
                    id.toString() + ": " + newItemCaption);
            select.setValue(id);
        }

    }

}