EDIT

package eu.etaxonomy.cdm.vaadin.view.dbstatus;

import java.util.List;

import java.util.Set;

import com.vaadin.data.Container;

import com.vaadin.data.Property.ValueChangeEvent;

import com.vaadin.data.Property.ValueChangeListener;

import com.vaadin.data.util.IndexedContainer;

import com.vaadin.event.ShortcutAction.KeyCode;

import com.vaadin.navigator.View;

import com.vaadin.navigator.ViewChangeListener.ViewChangeEvent;

import com.vaadin.ui.Alignment;

import com.vaadin.ui.Button;

import com.vaadin.ui.Button.ClickEvent;

import com.vaadin.ui.Button.ClickListener;

import com.vaadin.ui.ComboBox;

import com.vaadin.ui.CustomComponent;

import com.vaadin.ui.Label;

import com.vaadin.ui.ListSelect;

import com.vaadin.ui.Panel;

import com.vaadin.ui.Tree;

import com.vaadin.ui.VerticalLayout;

import eu.etaxonomy.cdm.model.common.DefinedTermBase;

import eu.etaxonomy.cdm.model.common.TermVocabulary;

import eu.etaxonomy.cdm.model.location.NamedArea;

import eu.etaxonomy.cdm.model.taxon.TaxonNode;

import eu.etaxonomy.cdm.vaadin.container.NamedAreaContainer;

import eu.etaxonomy.cdm.vaadin.container.TaxonNodeContainer;

import eu.etaxonomy.cdm.vaadin.presenter.dbstatus.DistributionSelectionPresenter;

public class DistributionSelectionView extends CustomComponent implements View, ClickListener{

    private VerticalLayout mainLayout;

    private Panel panel_1;

    private VerticalLayout verticalLayout_2;

    private Button button_proceed;

    private ComboBox classificationBox;

    private ComboBox distributionAreaBox;

    private ListSelect namedAreaList;

    private Tree taxonTree;

    private Label labelInstruction;

    private Label labelNoClassification;

    private static final long serialVersionUID = 1L;

	private DistributionSelectionPresenter distListener;

	/**

	 * The constructor should first build the main layout, set the

	 * composition root and then do any custom initialization.

	 *

	 * The constructor will not be automatically regenerated by the

	 * visual editor.

	 */

	public DistributionSelectionView(){

		buildMainLayout();

		setCompositionRoot(mainLayout);

		setStyleName("login");

		button_proceed.addClickListener(this);

		button_proceed.setClickShortcut(KeyCode.ENTER, null);

	}

	public void addListener(DistributionSelectionPresenter listener) {

		distListener = listener;

	}

	@Override

	public void buttonClick(ClickEvent event) {

		TaxonNode taxonNode = (TaxonNode) taxonTree.getValue();

		if(taxonNode==null){

			taxonNode = (TaxonNode) classificationBox.getValue();

		}

		TermVocabulary<NamedArea> term = (TermVocabulary<NamedArea>)distributionAreaBox.getValue();

		Set<NamedArea> selectedAreas = (Set<NamedArea>) namedAreaList.getValue();

		distListener.buttonClick(taxonNode, term, selectedAreas);

	}

	public void dataBinding(){

		classificationBox.setItemCaptionPropertyId(TaxonNodeContainer.LABEL);

		classificationBox.setContainerDataSource(new TaxonNodeContainer(null));

		classificationBox.setImmediate(true);

		classificationBox.addValueChangeListener(new ValueChangeListener() {

			@Override

			public void valueChange(ValueChangeEvent event) {

				TaxonNode parentNode = (TaxonNode) event.getProperty().getValue();

				if(parentNode!=null){

					taxonTree.setContainerDataSource(new TaxonNodeContainer(parentNode));

				}

				else{

					taxonTree.setContainerDataSource(null);

				}

				labelNoClassification.setVisible(parentNode==null);

			}

		});

        taxonTree.setItemCaptionPropertyId(TaxonNodeContainer.LABEL);

        distributionAreaBox.addValueChangeListener(new ValueChangeListener() {

			@Override

			public void valueChange(ValueChangeEvent event) {

				TermVocabulary<NamedArea> vocabulary = (TermVocabulary<NamedArea>) event.getProperty().getValue();

				NamedAreaContainer container = new NamedAreaContainer(vocabulary);

				namedAreaList.setContainerDataSource(container);

			}

		});

		List<TermVocabulary<DefinedTermBase>> namedAreaList = distListener.getNamedAreaList();

		Container d = new IndexedContainer(namedAreaList);

		distributionAreaBox.setContainerDataSource(d);

	}

	@Override

	public void enter(ViewChangeEvent event) {

	}

    private VerticalLayout buildMainLayout() {

        // common part: create layout

        mainLayout = new VerticalLayout();

        mainLayout.setImmediate(false);

        mainLayout.setWidth("100%");

        mainLayout.setHeight("100%");

        mainLayout.setMargin(false);

        // top-level component properties

        setWidth("100.0%");

        setHeight("100.0%");

        // panel_1

        panel_1 = buildPanel_1();

        mainLayout.addComponent(panel_1);

        mainLayout.setComponentAlignment(panel_1, new Alignment(48));

        return mainLayout;

    }

    private Panel buildPanel_1() {

        // common part: create layout

        panel_1 = new Panel();

        panel_1.setImmediate(false);

        panel_1.setWidth("-1px");

        panel_1.setHeight("-1px");

        // verticalLayout_2

        verticalLayout_2 = buildVerticalLayout_2();

        panel_1.setContent(verticalLayout_2);

        return panel_1;

    }

    private VerticalLayout buildVerticalLayout_2() {

        // common part: create layout

        verticalLayout_2 = new VerticalLayout();

        verticalLayout_2.setImmediate(false);

        verticalLayout_2.setWidth("-1px");

        verticalLayout_2.setHeight("-1px");

        verticalLayout_2.setMargin(true);

        verticalLayout_2.setSpacing(true);

        labelInstruction = new Label();

        labelInstruction.setImmediate(false);

        labelInstruction.setWidth("213px");

        labelInstruction.setHeight("-1px");

        labelInstruction.setValue("Please choose a Classification and/or taxon and a distribution area to proceed.");

        verticalLayout_2.addComponent(labelInstruction);

        // classificationBox

        classificationBox = new ComboBox();

        classificationBox.setCaption("Classification: ");

        classificationBox.setImmediate(false);

        classificationBox.setWidth("200px");

        classificationBox.setHeight("-1px");

        verticalLayout_2.addComponent(classificationBox);

        // distributionAreaBox

        distributionAreaBox = new ComboBox();

        distributionAreaBox.setCaption("Distribution Area");

        distributionAreaBox.setWidth("200px");

        distributionAreaBox.setHeight("-1px");

        verticalLayout_2.addComponent(distributionAreaBox);

        // named areas

        namedAreaList = new ListSelect();

        namedAreaList.setCaption("Areas");

        namedAreaList.setWidth("200px");

        namedAreaList.setHeight("-1px");

        namedAreaList.setMultiSelect(true);

        verticalLayout_2.addComponent(namedAreaList);

        // taxon tree

        taxonTree = new Tree("Taxonomy");

        taxonTree.setWidth("200px");

        verticalLayout_2.addComponent(taxonTree);

        labelNoClassification = new Label(" - Please select a classification - ");

        verticalLayout_2.addComponent(labelNoClassification);

        verticalLayout_2.setComponentAlignment(labelNoClassification, Alignment.BOTTOM_RIGHT);

        // button_proceed

        button_proceed = new Button();

        button_proceed.setCaption("Proceed");

        button_proceed.setImmediate(true);

        button_proceed.setWidth("-1px");

        button_proceed.setHeight("-1px");

        verticalLayout_2.addComponent(button_proceed);

        verticalLayout_2.setComponentAlignment(button_proceed, new Alignment(10));

        return verticalLayout_2;

    }

}