JFace ComboViewer databinding

Dialog with ComboViewer

    protected Control createDialogArea(Composite parent) {
        ...
        createEntityCombo();
        ...
        initBindings();
    }

    private void createEntityCombo(Composite parent) {
        final ComboViewer entityCombo = new ComboViewer(parent, SWT.VERTICAL | SWT.DROP_DOWN | SWT.BORDER | SWT.READ_ONLY);
        final GridData entityComboLayoutData = new GridData(SWT.END, SWT.CENTER, false, false);
        entityCombo.getCombo().setLayoutData(entityComboLayoutData);


        final ObservableListContentProvider entityComboContentProvider = new ObservableListContentProvider();
        entityCombo.setContentProvider(entityComboContentProvider);
        entityCombo.setLabelProvider(
                new ObservableMapLabelProvider(BeansObservables.observeMap(entityComboContentProvider.getKnownElements(),
                        EventStoreWriterFieldMapping.ENTITY_NAME_PROPERTY)) {
                });

        entityCombo.setInput(modelObject.getEntitiesObservable());
        setInitialSelection(entityCombo);
    }

    private void setInitialSelection(ComboViewer entityCombo) {
        if (modelObject.getSelectedEntity() != null) {
            entityCombo.setSelection(new StructuredSelection(modelObject.getSelectedEntity()));
        }
    }

    private void initBindings() {

        final DataBindingContext bindingContext = new DataBindingContext();

        // selected entity binding: [entity selected in entities combo -> modelObject.selectedEntity]
        final IObservableValue entityComboObservable = ViewersObservables.observeSingleSelection(entityCombo);
        final IObservableValue modelSelectedEntityObservable = BeansObservables.observeValue(modelObject,
                EventStoreWriterFieldMapping.SELECTED_ENTITY_PROPERTY);
        bindingContext.bindValue(modelSelectedEntityObservable, entityComboObservable);

        // selected entity binding: [modelObject.selectedEntity -> entity selected in entities combo]
        bindingContext.bindValue(entityComboObservable, modelSelectedEntityObservable);
    }

ModelObject

public class ModelObject {

    static final String SELECTED_ENTITY_PROPERTY = "selectedEntity";

    /**
     * Observable list of labels <DatasetItem>s, labels are also instances of this class.
     * Unfortunately, {@link IObservableCollection} is not generic.
     */
    private final IObservableCollection entities = new WritableList();
    private Entity selectedEntity;

    /** Used to allow automatic data binding */
    private final PropertyChangeSupport propertyChangeSupport  = new PropertyChangeSupport(this);



    public ModelObject(Collection<Entity> entities) {
        if (CollectionUtils.isNotEmpty(entities)) {
            this.entities.addAll(entities);
        }
    }


    /**
     * @return unmodifiable collection of all known Eventstore entities, or empty collection if no such entities exist
     */
    @SuppressWarnings("unchecked")
    public Collection<Entity> getEntities() {
        if (CollectionUtils.isEmpty(entities)) {
            return Collections.<Entity>emptyList();
        }
        return Collections.unmodifiableCollection(entities);
    }

    public IObservableCollection getEntitiesObservable() {
        return entities;
    }

    /**
     * Selected entity represents entity which user selected from list of all entities.
     * Entities fields mappings can be retrieved via {@link com.gooddata.service.model.eventstore.Entity#getAttributes()}.
     * @return selected entity
     */
    public Entity getSelectedEntity() {
        return selectedEntity;
    }

    public void setSelectedEntity(Entity selectedEntity) {
        final Entity oldSelectedEntity = this.selectedEntity;
        this.selectedEntity = selectedEntity;
        propertyChangeSupport.firePropertyChange(SELECTED_ENTITY_PROPERTY, oldSelectedEntity, selectedEntity);
    }
   /**
     * Add a listener to be notified about property changes
     */
    public void addPropertyChangeListener(String propertyName, PropertyChangeListener listener) {
        propertyChangeSupport.addPropertyChangeListener(propertyName, listener);
    }

    /**
     * Remove attached listener.
     */
    public void removePropertyChangeListener(PropertyChangeListener listener) {
        propertyChangeSupport.removePropertyChangeListener(listener);
    }

   

}