Ex.9

DataBinding.java

package com.vaadin.training.framework.exercises.ex9;

import com.vaadin.data.util.IndexedContainer;
import com.vaadin.navigator.View;
import com.vaadin.navigator.ViewChangeListener.ViewChangeEvent;
import com.vaadin.ui.ComboBox;
import com.vaadin.ui.GridLayout;
import com.vaadin.ui.Label;
import com.vaadin.ui.TextField;

@SuppressWarnings("serial")
public class DataBinding extends GridLayout implements View {

	public DataBinding() {
		super(2, 2);
		setSpacing(true);

		TextField textField = new TextField();
		textField.setImmediate(true);
		addComponent(textField);

		Label label1 = new Label();
		label1.setPropertyDataSource(textField);
		addComponent(label1);

		ComboBox comboBox = createCombo1();

		/**
		 * Uncomment the following two lines for the bonus solution.
		 * Note that <code>comboBox.setPropertyDataSource(textField);</code> is
		 * not a correct solution as it will not sanitize the textfield input
		 * properly with respect to the comboBox.
		 */
		 textField.setPropertyDataSource(comboBox);
		 textField.setNullRepresentation("");

		addComponent(comboBox);
		Label label2 = new Label();
		label2.setPropertyDataSource(comboBox);
		addComponent(label2);

	}

	@SuppressWarnings("unchecked")
	private ComboBox createCombo1() {

		IndexedContainer cont = new IndexedContainer();
		cont.addContainerProperty("caption", String.class, "");

		cont.addItem("DE").getItemProperty("caption").setValue("Germany");
		cont.addItem("FI").getItemProperty("caption").setValue("Finland");
		cont.addItem("US").getItemProperty("caption").setValue("USA");

		ComboBox comboBox = new ComboBox();
		comboBox.setContainerDataSource(cont);
		comboBox.setItemCaptionPropertyId("caption");
		comboBox.setImmediate(true);
		return comboBox;
	}

	private ComboBox createCombo2() {
		ComboBox comboBox = new ComboBox();
		comboBox.addItem("DE");
		comboBox.addItem("FI");
		comboBox.addItem("US");
		comboBox.setItemCaption("DE", "Germany");
		comboBox.setItemCaption("FI", "Finland");
		comboBox.setItemCaption("US", "USA");
		comboBox.setImmediate(true);
		return comboBox;
	}

	@Override
	public void enter(ViewChangeEvent event) {
		//Navigator method, ignore for now
	}

}