EDIT

package eu.etaxonomy.vaadin.ui.view;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.context.ApplicationEventPublisher;

import com.vaadin.data.fieldgroup.BeanFieldGroup;

import com.vaadin.data.fieldgroup.FieldGroup.CommitEvent;

import com.vaadin.data.fieldgroup.FieldGroup.CommitException;

import com.vaadin.data.fieldgroup.FieldGroup.CommitHandler;

import com.vaadin.server.FontAwesome;

import com.vaadin.ui.AbstractOrderedLayout;

import com.vaadin.ui.Alignment;

import com.vaadin.ui.Button;

import com.vaadin.ui.CheckBox;

import com.vaadin.ui.Component;

import com.vaadin.ui.CustomComponent;

import com.vaadin.ui.Field;

import com.vaadin.ui.FormLayout;

import com.vaadin.ui.HorizontalLayout;

import com.vaadin.ui.Notification;

import com.vaadin.ui.Notification.Type;

import com.vaadin.ui.PopupDateField;

import com.vaadin.ui.TextField;

import com.vaadin.ui.VerticalLayout;

import com.vaadin.ui.themes.ValoTheme;

import eu.etaxonomy.vaadin.ui.view.DoneWithPopupEvent.Reason;

public abstract class AbstractPopupEditor<DTO extends Object> extends CustomComponent

		implements PopupView {

	private static final long serialVersionUID = 1441816620197127918L;

	private BeanFieldGroup<DTO> fieldGroup;

	private VerticalLayout mainLayout;

	private AbstractOrderedLayout fieldLayout;

    @Autowired

    ApplicationEventPublisher eventBus;

	private HorizontalLayout buttonLayout;

	private Button save;

	private Button cancel;

	private class SaveHandler implements CommitHandler {

		private static final long serialVersionUID = 2047223089707080659L;

		@Override

		public void preCommit(CommitEvent commitEvent) throws CommitException {

		}

		@Override

		public void postCommit(CommitEvent commitEvent) throws CommitException {

			try {

			    AbstractPopupEditor.this.storeDto(getBean());

				eventBus.publishEvent(new DoneWithPopupEvent(AbstractPopupEditor.this, Reason.SAVE));

			} catch (Exception e) {

				throw new CommitException("Failed to store data to backend", e);

			}

		}

	}

	public abstract void storeDto(DTO bean) throws CommitException;

	public AbstractPopupEditor(Class<DTO> dtoType) {

		this(new FormLayout(), dtoType);

		fieldLayout.setMargin(true);

	}

	public AbstractPopupEditor(AbstractOrderedLayout layout, Class<DTO> dtoType) {

		setWidthUndefined();

		mainLayout = new VerticalLayout();

		mainLayout.setWidthUndefined();

		fieldGroup = new BeanFieldGroup<>(dtoType);

		fieldGroup.addCommitHandler(new SaveHandler());

		setCompositionRoot(mainLayout);

		fieldLayout = layout;

		fieldLayout.setWidthUndefined();

		fieldLayout.setSpacing(true);

		buttonLayout = new HorizontalLayout();

		buttonLayout.setStyleName(ValoTheme.WINDOW_BOTTOM_TOOLBAR);

		buttonLayout.setWidth(100, Unit.PERCENTAGE);

		buttonLayout.setSpacing(true);

		save = new Button("Save", FontAwesome.SAVE);

		save.setStyleName(ValoTheme.BUTTON_PRIMARY);

		save.addClickListener(e -> onSaveClicked());

		cancel = new Button("Cancel", FontAwesome.TRASH);

		cancel.addClickListener(e -> onCancelClicked());

		buttonLayout.addComponents(save, cancel);

		buttonLayout.setExpandRatio(save, 1);

		buttonLayout.setComponentAlignment(save, Alignment.TOP_RIGHT);

		buttonLayout.setComponentAlignment(cancel, Alignment.TOP_RIGHT);

		mainLayout.addComponents(fieldLayout, buttonLayout);

	}

	@Override

	public void setReadOnly(boolean readOnly) {

		super.setReadOnly(readOnly);

		save.setVisible(!readOnly);

		cancel.setCaption(readOnly ? "Close" : "Cancel");

	}

	protected VerticalLayout getMainLayout() {

		return mainLayout;

	}

	protected void addCommitHandler(CommitHandler commitHandler) {

		fieldGroup.addCommitHandler(commitHandler);

	}

	protected DTO getBean() {

		if (fieldGroup.getItemDataSource() != null) {

			return fieldGroup.getItemDataSource().getBean();

		}

		return null;

	}

	private void onCancelClicked() {

		fieldGroup.discard();

		eventBus.publishEvent(new DoneWithPopupEvent(this, Reason.CANCEL));

	}

	private void onSaveClicked() {

		try {

			fieldGroup.commit();

		} catch (CommitException e) {

			Notification.show("Error saving", Type.ERROR_MESSAGE);

		}

	}

	public void showInEditor(DTO beanToEdit) {

		fieldGroup.setItemDataSource(beanToEdit);

	}

	protected TextField addTextField(String caption, String propertyId) {

		return addField(new TextField(caption), propertyId);

	}

	protected PopupDateField addDateField(String caption, String propertyId) {

		return addField(new PopupDateField(caption), propertyId);

	}

	protected CheckBox addCheckBox(String caption, String propertyId) {

		return addField(new CheckBox(caption), propertyId);

	}

	protected <T extends Field> T addField(T field, String propertyId) {

		fieldGroup.bind(field, propertyId);

		fieldLayout.addComponent(field);

		return field;

	}

	protected void addComponent(Component component) {

		fieldLayout.addComponent(component);

	}

	protected void bindDesign(Component component) {

		fieldLayout.removeAllComponents();

		fieldGroup.bindMemberFields(component);

		fieldLayout.addComponent(component);

	}

}