tests/org.eclipse.jface.tests.databinding/src/org/eclipse/jface/tests/databinding/scenarios/MasterDetailScenarios.java - platform/eclipse.platform.ui - Git at Google

 /*******************************************************************************
  * Copyright (c) 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.jface.tests.databinding.scenarios;

 import java.util.Arrays;
 import java.util.List;

 import org.eclipse.jface.databinding.IUpdatableValue;
 import org.eclipse.jface.databinding.Property;
 import org.eclipse.jface.databinding.swt.SWTProperties;
 import org.eclipse.jface.databinding.updatables.ConditionalUpdatableValue;
 import org.eclipse.jface.databinding.viewers.ViewersProperties;
 import org.eclipse.jface.examples.databinding.model.Adventure;
 import org.eclipse.jface.examples.databinding.model.Catalog;
 import org.eclipse.jface.examples.databinding.model.Category;
 import org.eclipse.jface.examples.databinding.model.Lodging;
 import org.eclipse.jface.examples.databinding.model.SampleData;
 import org.eclipse.jface.viewers.ContentViewer;
 import org.eclipse.jface.viewers.IStructuredContentProvider;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.jface.viewers.LabelProvider;
 import org.eclipse.jface.viewers.ListViewer;
 import org.eclipse.jface.viewers.StructuredSelection;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.events.SelectionEvent;
 import org.eclipse.swt.events.SelectionListener;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Text;

 /**
  * To run the tests in this class, right-click and select "Run As JUnit Plug-in
  * Test". This will also start an Eclipse instance. To clean up the launch
  * configuration, open up its "Main" tab and select "[No Application] - Headless
  * Mode" as the application to run.
  */

 public class MasterDetailScenarios extends ScenariosTestCase {

 	protected void setUp() throws Exception {
 		super.setUp();
 		// do any setup work here
 	}

 	protected void tearDown() throws Exception {
 		// do any teardown work here
 		super.tearDown();
 	}

 	protected Object getViewerSelection(ContentViewer contentViewer) {
 		return ((IStructuredSelection) contentViewer.getSelection())
 				.getFirstElement();
 	}

 	/**
 	 * @return the ComboViewer's domain object list
 	 */
 	protected List getViewerContent(ContentViewer contentViewer) {
 		Object[] elements = ((IStructuredContentProvider) contentViewer
 				.getContentProvider()).getElements(null);
 		if (elements != null)
 			return Arrays.asList(elements);
 		return null;
 	}

 	public void testScenario01() {
 		// Displaying the catalog's list of Lodging objects in a list viewer,
 		// using their names. The name of the currently selected Lodging can
 		// be edited in a text widget. There is always a selected Lodging
 		// object.
 		ListViewer listViewer = new ListViewer(getComposite(), SWT.BORDER);
 		listViewer.getList().setLayoutData(
 				new GridData(SWT.FILL, SWT.FILL, false, false));
 		Catalog catalog = SampleData.CATALOG_2005;

 		listViewer.setLabelProvider(new LabelProvider() {
 			public String getText(Object element) {
 				return ((Lodging) element).getName();
 			}
 		});
 		getDbc().bind(listViewer,
 				new Property(catalog, "lodgings"), null);

 		assertArrayEquals(catalog.getLodgings(), getViewerContent(listViewer).toArray());

 		IUpdatableValue selectedLodging = (IUpdatableValue) getDbc()
 				.createUpdatable(
 						new Property(listViewer,
 								ViewersProperties.SINGLE_SELECTION));

 		selectedLodging.setValue(SampleData.CAMP_GROUND);

 		assertEquals(SampleData.CAMP_GROUND, getViewerSelection(listViewer));
 		Text txtName = new Text(getComposite(), SWT.BORDER);

 		getDbc().bind(
 				txtName,
 				new Property(selectedLodging, "name", String.class,
 						Boolean.FALSE), null);

 		assertEquals(txtName.getText(), SampleData.CAMP_GROUND.getName());
 		enterText(txtName, "foobar");
 		assertEquals("foobar", SampleData.CAMP_GROUND.getName());
 		listViewer.setSelection(new StructuredSelection(
 				SampleData.FIVE_STAR_HOTEL));
 		assertEquals(SampleData.FIVE_STAR_HOTEL, selectedLodging.getValue());
 		assertEquals(SampleData.FIVE_STAR_HOTEL.getName(), txtName.getText());
 		SampleData.FIVE_STAR_HOTEL.setName("barfoo");
 		assertEquals("barfoo", txtName.getText());

 		// Now make sure that the event listeners get removed on dispose()
 		// Values should no longer be updated
 //		selectedLodging.dispose();
 //
 //		selectedLodging.setValue(SampleData.CAMP_GROUND);
 //		assertNotSame(SampleData.CAMP_GROUND, getViewerSelection(listViewer));
 //		assertNotSame(txtName.getText(), SampleData.CAMP_GROUND.getName());
 //		enterText(txtName, "foobar");
 //		assertNotSame("foobar", SampleData.CAMP_GROUND.getName());
 //		listViewer.setSelection(new StructuredSelection(
 //				SampleData.FIVE_STAR_HOTEL));
 //		assertNotSame(SampleData.FIVE_STAR_HOTEL, selectedLodging.getValue());
 //		assertNotSame(SampleData.FIVE_STAR_HOTEL.getName(), txtName.getText());
 //		SampleData.FIVE_STAR_HOTEL.setName("barfoo");
 //		assertNotSame("barfoo", txtName.getText());
 	}

 	public void testScenario02() {
 		// Selecting from the list of lodgings for an adventure and editing the
 		// properties of the selected lodging in text widgets. If no lodging is
 		// selected the input controls for name and adventure are disabled.
 		// There are two buttons "Add" and "Remove"; clicking on "Add" creates a
 		// new lodging and selects it so it can be edited, clicking on "Remove"
 		// removes the currently selected lodging from the list.
 		final ListViewer listViewer = new ListViewer(getComposite(), SWT.BORDER);
 		listViewer.getList().setLayoutData(
 				new GridData(SWT.FILL, SWT.FILL, false, false));
 		final Catalog catalog = SampleData.CATALOG_2005;

 		listViewer.setLabelProvider(new LabelProvider() {
 			public String getText(Object element) {
 				return ((Lodging) element).getName();
 			}
 		});
 		getDbc().bind(listViewer,
 				new Property(catalog, "lodgings"), null);

 		assertArrayEquals(catalog.getLodgings(), getViewerContent(listViewer).toArray());

 		final IUpdatableValue selectedLodgingUpdatable = (IUpdatableValue) getDbc()
 				.createUpdatable(
 						new Property(listViewer,
 								ViewersProperties.SINGLE_SELECTION));

 		selectedLodgingUpdatable.setValue(null);
 		assertTrue(listViewer.getSelection().isEmpty());

 		ConditionalUpdatableValue selectionExistsUpdatable = new ConditionalUpdatableValue(
 				selectedLodgingUpdatable) {
 			protected boolean compute(Object currentValue) {
 				return currentValue != null;
 			}
 		};

 		assertFalse(((Boolean) selectionExistsUpdatable.getValue())
 				.booleanValue());

 		final Text txtName = new Text(getComposite(), SWT.BORDER);

 		getDbc().bind(
 				new Property(txtName, SWTProperties.ENABLED),
 				selectionExistsUpdatable, null);
 		getDbc().bind(
 				new Property(txtName, SWTProperties.TEXT),
 				new Property(selectedLodgingUpdatable, "name",
 						String.class, Boolean.FALSE), null);

 		assertEquals(txtName.getText(), "");
 		assertFalse(txtName.getEnabled());

 		final Text txtDescription = new Text(getComposite(), SWT.BORDER);

 		getDbc().bind(
 				new Property(txtDescription,
 						SWTProperties.ENABLED), selectionExistsUpdatable,
 				null);
 		getDbc().bind(
 				new Property(txtDescription,
 						SWTProperties.TEXT),
 				new Property(selectedLodgingUpdatable,
 						"description", String.class, Boolean.FALSE), null);

 		assertEquals(txtDescription.getText(), "");
 		assertFalse(txtDescription.getEnabled());

 		Button addButton = new Button(getComposite(), SWT.PUSH);
 		addButton.addSelectionListener(new SelectionListener() {
 			public void widgetSelected(SelectionEvent e) {
 				Lodging selectedLodging = (Lodging) selectedLodgingUpdatable
 						.getValue();
 				int insertionIndex = 0;
 				if (selectedLodging != null) {
 					insertionIndex = Arrays.asList(catalog.getLodgings())
 							.indexOf(selectedLodging);
 					assertTrue(insertionIndex >= 0);
 				}
 				Lodging newLodging = SampleData.FACTORY.createLodging();
 				int itemCount = listViewer.getList().getItemCount();
 				newLodging.setName("new lodging name " + itemCount);
 				newLodging.setDescription("new lodging description "
 						+ itemCount);
 				catalog.addLodging(newLodging);
 				assertEquals(itemCount + 1, listViewer.getList().getItemCount());
 				listViewer.setSelection(new StructuredSelection(newLodging));
 				assertSame(newLodging, selectedLodgingUpdatable.getValue());
 				assertTrue(txtName.getEnabled());
 				assertTrue(txtDescription.getEnabled());
 				assertEquals(newLodging.getName(), txtName.getText());
 				assertEquals(newLodging.getDescription(), txtDescription
 						.getText());
 			}

 			public void widgetDefaultSelected(SelectionEvent e) {
 				widgetSelected(e);
 			}
 		});

 		Button removeButton = new Button(getComposite(), SWT.PUSH);
 		removeButton.addSelectionListener(new SelectionListener() {
 			public void widgetSelected(SelectionEvent e) {
 				Lodging selectedLodging = (Lodging) selectedLodgingUpdatable
 						.getValue();
 				assertNotNull(selectedLodging);
 				int deletionIndex = Arrays.asList(catalog.getLodgings())
 						.indexOf(selectedLodging);
 				assertTrue(deletionIndex >= 0);
 				int itemCount = listViewer.getList().getItemCount();
 				catalog.removeLodging(selectedLodging);
 				assertEquals(itemCount - 1, listViewer.getList().getItemCount());
 				assertNull(selectedLodgingUpdatable.getValue());
 			}

 			public void widgetDefaultSelected(SelectionEvent e) {
 				widgetSelected(e);
 			}
 		});

 		pushButtonWithEvents(addButton);
 		pushButtonWithEvents(removeButton);
 		pushButtonWithEvents(addButton);
 		pushButtonWithEvents(addButton);
 		pushButtonWithEvents(removeButton);
 	}

 	public void testScenario03() {
 		// List adventures and for the selected adventure allow its default
 		// lodging�s name and description to be changed in text controls. If
 		// there is no selected adventure or the default lodging is null the
 		// text controls are disabled. This is a nested property. The default
 		// lodging can be changed elsewhere, and the list
 		final Catalog catalog = SampleData.CATALOG_2005;

 		final ListViewer categoryListViewer = new ListViewer(getComposite(),
 				SWT.BORDER);
 		categoryListViewer.getList().setLayoutData(
 				new GridData(SWT.FILL, SWT.FILL, false, false));
 		categoryListViewer.setLabelProvider(new LabelProvider() {
 			public String getText(Object element) {
 				return ((Category) element).getName();
 			}
 		});
 		getDbc().bind(categoryListViewer,
 				new Property(catalog, "categories"), null);

 		assertArrayEquals(catalog.getCategories(),
 				getViewerContent(categoryListViewer).toArray());

 		final IUpdatableValue selectedCategoryUpdatable = (IUpdatableValue) getDbc()
 				.createUpdatable(
 						new Property(categoryListViewer,
 								ViewersProperties.SINGLE_SELECTION));

 		final ListViewer adventureListViewer = new ListViewer(getComposite(),
 				SWT.BORDER);
 		adventureListViewer.getList().setLayoutData(
 				new GridData(SWT.FILL, SWT.FILL, false, false));
 		adventureListViewer.setLabelProvider(new LabelProvider() {
 			public String getText(Object element) {
 				return ((Adventure) element).getName();
 			}
 		});

 		getDbc().bind(
 				adventureListViewer,
 				new Property(selectedCategoryUpdatable,
 						"adventures", Adventure.class, Boolean.TRUE), null);

 		ConditionalUpdatableValue categorySelectionExistsUpdatable = new ConditionalUpdatableValue(
 				selectedCategoryUpdatable) {
 			protected boolean compute(Object currentValue) {
 				return currentValue != null;
 			}
 		};

 		getDbc().bind(
 				new Property(adventureListViewer.getList(),
 						SWTProperties.ENABLED),
 				categorySelectionExistsUpdatable, null);

 		final IUpdatableValue selectedAdventureUpdatable = (IUpdatableValue) getDbc()
 				.createUpdatable(
 						new Property(adventureListViewer,
 								ViewersProperties.SINGLE_SELECTION));

 		ConditionalUpdatableValue adventureSelectionExistsUpdatable = new ConditionalUpdatableValue(
 				selectedAdventureUpdatable) {
 			protected boolean compute(Object currentValue) {
 				return currentValue != null;
 			}
 		};

 		final Text txtName = new Text(getComposite(), SWT.BORDER);

 		getDbc().bind(
 				new Property(txtName, SWTProperties.ENABLED),
 				adventureSelectionExistsUpdatable, null);
 		getDbc().bind(
 				new Property(txtName, SWTProperties.TEXT),
 				new Property(selectedAdventureUpdatable, "name",
 						String.class, Boolean.FALSE), null);

 		assertEquals(txtName.getText(), "");
 		assertFalse(txtName.getEnabled());

 		final Text txtDescription = new Text(getComposite(), SWT.BORDER);

 		getDbc().bind(
 				new Property(txtDescription,
 						SWTProperties.ENABLED),
 				adventureSelectionExistsUpdatable, null);
 		getDbc().bind(
 				new Property(txtDescription,
 						SWTProperties.TEXT),
 				new Property(selectedAdventureUpdatable,
 						"description", String.class, Boolean.FALSE), null);

 		assertFalse(adventureListViewer.getList().isEnabled());
 		categoryListViewer.setSelection(new StructuredSelection(
 				SampleData.SUMMER_CATEGORY));
 		assertTrue(adventureListViewer.getList().isEnabled());
 		assertFalse(txtName.getEnabled());
 		adventureListViewer.setSelection(new StructuredSelection(
 				SampleData.RAFTING_HOLIDAY));
 		assertTrue(txtName.getEnabled());
 		assertEquals(SampleData.RAFTING_HOLIDAY.getName(), txtName.getText());
 		categoryListViewer.setSelection(new StructuredSelection(
 				SampleData.WINTER_CATEGORY));
 		assertTrue(adventureListViewer.getList().isEnabled());
 		assertFalse(txtName.getEnabled());
 	}
 }
	/*******************************************************************************
	* Copyright (c) 2005 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.jface.tests.databinding.scenarios;

	import java.util.Arrays;
	import java.util.List;

	import org.eclipse.jface.databinding.IUpdatableValue;
	import org.eclipse.jface.databinding.Property;
	import org.eclipse.jface.databinding.swt.SWTProperties;
	import org.eclipse.jface.databinding.updatables.ConditionalUpdatableValue;
	import org.eclipse.jface.databinding.viewers.ViewersProperties;
	import org.eclipse.jface.examples.databinding.model.Adventure;
	import org.eclipse.jface.examples.databinding.model.Catalog;
	import org.eclipse.jface.examples.databinding.model.Category;
	import org.eclipse.jface.examples.databinding.model.Lodging;
	import org.eclipse.jface.examples.databinding.model.SampleData;
	import org.eclipse.jface.viewers.ContentViewer;
	import org.eclipse.jface.viewers.IStructuredContentProvider;
	import org.eclipse.jface.viewers.IStructuredSelection;
	import org.eclipse.jface.viewers.LabelProvider;
	import org.eclipse.jface.viewers.ListViewer;
	import org.eclipse.jface.viewers.StructuredSelection;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.events.SelectionEvent;
	import org.eclipse.swt.events.SelectionListener;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.widgets.Button;
	import org.eclipse.swt.widgets.Text;

	/**
	* To run the tests in this class, right-click and select "Run As JUnit Plug-in
	* Test". This will also start an Eclipse instance. To clean up the launch
	* configuration, open up its "Main" tab and select "[No Application] - Headless
	* Mode" as the application to run.
	*/

	public class MasterDetailScenarios extends ScenariosTestCase {

	protected void setUp() throws Exception {
	super.setUp();
	// do any setup work here
	}

	protected void tearDown() throws Exception {
	// do any teardown work here
	super.tearDown();
	}

	protected Object getViewerSelection(ContentViewer contentViewer) {
	return ((IStructuredSelection) contentViewer.getSelection())
	.getFirstElement();
	}

	/**
	* @return the ComboViewer's domain object list
	*/
	protected List getViewerContent(ContentViewer contentViewer) {
	Object[] elements = ((IStructuredContentProvider) contentViewer
	.getContentProvider()).getElements(null);
	if (elements != null)
	return Arrays.asList(elements);
	return null;
	}

	public void testScenario01() {
	// Displaying the catalog's list of Lodging objects in a list viewer,
	// using their names. The name of the currently selected Lodging can
	// be edited in a text widget. There is always a selected Lodging
	// object.
	ListViewer listViewer = new ListViewer(getComposite(), SWT.BORDER);
	listViewer.getList().setLayoutData(
	new GridData(SWT.FILL, SWT.FILL, false, false));
	Catalog catalog = SampleData.CATALOG_2005;

	listViewer.setLabelProvider(new LabelProvider() {
	public String getText(Object element) {
	return ((Lodging) element).getName();
	}
	});
	getDbc().bind(listViewer,
	new Property(catalog, "lodgings"), null);

	assertArrayEquals(catalog.getLodgings(), getViewerContent(listViewer).toArray());

	IUpdatableValue selectedLodging = (IUpdatableValue) getDbc()
	.createUpdatable(
	new Property(listViewer,
	ViewersProperties.SINGLE_SELECTION));

	selectedLodging.setValue(SampleData.CAMP_GROUND);

	assertEquals(SampleData.CAMP_GROUND, getViewerSelection(listViewer));
	Text txtName = new Text(getComposite(), SWT.BORDER);

	getDbc().bind(
	txtName,
	new Property(selectedLodging, "name", String.class,
	Boolean.FALSE), null);

	assertEquals(txtName.getText(), SampleData.CAMP_GROUND.getName());
	enterText(txtName, "foobar");
	assertEquals("foobar", SampleData.CAMP_GROUND.getName());
	listViewer.setSelection(new StructuredSelection(
	SampleData.FIVE_STAR_HOTEL));
	assertEquals(SampleData.FIVE_STAR_HOTEL, selectedLodging.getValue());
	assertEquals(SampleData.FIVE_STAR_HOTEL.getName(), txtName.getText());
	SampleData.FIVE_STAR_HOTEL.setName("barfoo");
	assertEquals("barfoo", txtName.getText());

	// Now make sure that the event listeners get removed on dispose()
	// Values should no longer be updated
	// selectedLodging.dispose();
	//
	// selectedLodging.setValue(SampleData.CAMP_GROUND);
	// assertNotSame(SampleData.CAMP_GROUND, getViewerSelection(listViewer));
	// assertNotSame(txtName.getText(), SampleData.CAMP_GROUND.getName());
	// enterText(txtName, "foobar");
	// assertNotSame("foobar", SampleData.CAMP_GROUND.getName());
	// listViewer.setSelection(new StructuredSelection(
	// SampleData.FIVE_STAR_HOTEL));
	// assertNotSame(SampleData.FIVE_STAR_HOTEL, selectedLodging.getValue());
	// assertNotSame(SampleData.FIVE_STAR_HOTEL.getName(), txtName.getText());
	// SampleData.FIVE_STAR_HOTEL.setName("barfoo");
	// assertNotSame("barfoo", txtName.getText());
	}

	public void testScenario02() {
	// Selecting from the list of lodgings for an adventure and editing the
	// properties of the selected lodging in text widgets. If no lodging is
	// selected the input controls for name and adventure are disabled.
	// There are two buttons "Add" and "Remove"; clicking on "Add" creates a
	// new lodging and selects it so it can be edited, clicking on "Remove"
	// removes the currently selected lodging from the list.
	final ListViewer listViewer = new ListViewer(getComposite(), SWT.BORDER);
	listViewer.getList().setLayoutData(
	new GridData(SWT.FILL, SWT.FILL, false, false));
	final Catalog catalog = SampleData.CATALOG_2005;

	listViewer.setLabelProvider(new LabelProvider() {
	public String getText(Object element) {
	return ((Lodging) element).getName();
	}
	});
	getDbc().bind(listViewer,
	new Property(catalog, "lodgings"), null);

	assertArrayEquals(catalog.getLodgings(), getViewerContent(listViewer).toArray());

	final IUpdatableValue selectedLodgingUpdatable = (IUpdatableValue) getDbc()
	.createUpdatable(
	new Property(listViewer,
	ViewersProperties.SINGLE_SELECTION));

	selectedLodgingUpdatable.setValue(null);
	assertTrue(listViewer.getSelection().isEmpty());

	ConditionalUpdatableValue selectionExistsUpdatable = new ConditionalUpdatableValue(
	selectedLodgingUpdatable) {
	protected boolean compute(Object currentValue) {
	return currentValue != null;
	}
	};

	assertFalse(((Boolean) selectionExistsUpdatable.getValue())
	.booleanValue());

	final Text txtName = new Text(getComposite(), SWT.BORDER);

	getDbc().bind(
	new Property(txtName, SWTProperties.ENABLED),
	selectionExistsUpdatable, null);
	getDbc().bind(
	new Property(txtName, SWTProperties.TEXT),
	new Property(selectedLodgingUpdatable, "name",
	String.class, Boolean.FALSE), null);

	assertEquals(txtName.getText(), "");
	assertFalse(txtName.getEnabled());

	final Text txtDescription = new Text(getComposite(), SWT.BORDER);

	getDbc().bind(
	new Property(txtDescription,
	SWTProperties.ENABLED), selectionExistsUpdatable,
	null);
	getDbc().bind(
	new Property(txtDescription,
	SWTProperties.TEXT),
	new Property(selectedLodgingUpdatable,
	"description", String.class, Boolean.FALSE), null);

	assertEquals(txtDescription.getText(), "");
	assertFalse(txtDescription.getEnabled());

	Button addButton = new Button(getComposite(), SWT.PUSH);
	addButton.addSelectionListener(new SelectionListener() {
	public void widgetSelected(SelectionEvent e) {
	Lodging selectedLodging = (Lodging) selectedLodgingUpdatable
	.getValue();
	int insertionIndex = 0;
	if (selectedLodging != null) {
	insertionIndex = Arrays.asList(catalog.getLodgings())
	.indexOf(selectedLodging);
	assertTrue(insertionIndex >= 0);
	}
	Lodging newLodging = SampleData.FACTORY.createLodging();
	int itemCount = listViewer.getList().getItemCount();
	newLodging.setName("new lodging name " + itemCount);
	newLodging.setDescription("new lodging description "
	+ itemCount);
	catalog.addLodging(newLodging);
	assertEquals(itemCount + 1, listViewer.getList().getItemCount());
	listViewer.setSelection(new StructuredSelection(newLodging));
	assertSame(newLodging, selectedLodgingUpdatable.getValue());
	assertTrue(txtName.getEnabled());
	assertTrue(txtDescription.getEnabled());
	assertEquals(newLodging.getName(), txtName.getText());
	assertEquals(newLodging.getDescription(), txtDescription
	.getText());
	}

	public void widgetDefaultSelected(SelectionEvent e) {
	widgetSelected(e);
	}
	});

	Button removeButton = new Button(getComposite(), SWT.PUSH);
	removeButton.addSelectionListener(new SelectionListener() {
	public void widgetSelected(SelectionEvent e) {
	Lodging selectedLodging = (Lodging) selectedLodgingUpdatable
	.getValue();
	assertNotNull(selectedLodging);
	int deletionIndex = Arrays.asList(catalog.getLodgings())
	.indexOf(selectedLodging);
	assertTrue(deletionIndex >= 0);
	int itemCount = listViewer.getList().getItemCount();
	catalog.removeLodging(selectedLodging);
	assertEquals(itemCount - 1, listViewer.getList().getItemCount());
	assertNull(selectedLodgingUpdatable.getValue());
	}

	public void widgetDefaultSelected(SelectionEvent e) {
	widgetSelected(e);
	}
	});

	pushButtonWithEvents(addButton);
	pushButtonWithEvents(removeButton);
	pushButtonWithEvents(addButton);
	pushButtonWithEvents(addButton);
	pushButtonWithEvents(removeButton);
	}

	public void testScenario03() {
	// List adventures and for the selected adventure allow its default
	// lodging�s name and description to be changed in text controls. If
	// there is no selected adventure or the default lodging is null the
	// text controls are disabled. This is a nested property. The default
	// lodging can be changed elsewhere, and the list
	final Catalog catalog = SampleData.CATALOG_2005;

	final ListViewer categoryListViewer = new ListViewer(getComposite(),
	SWT.BORDER);
	categoryListViewer.getList().setLayoutData(
	new GridData(SWT.FILL, SWT.FILL, false, false));
	categoryListViewer.setLabelProvider(new LabelProvider() {
	public String getText(Object element) {
	return ((Category) element).getName();
	}
	});
	getDbc().bind(categoryListViewer,
	new Property(catalog, "categories"), null);

	assertArrayEquals(catalog.getCategories(),
	getViewerContent(categoryListViewer).toArray());

	final IUpdatableValue selectedCategoryUpdatable = (IUpdatableValue) getDbc()
	.createUpdatable(
	new Property(categoryListViewer,
	ViewersProperties.SINGLE_SELECTION));

	final ListViewer adventureListViewer = new ListViewer(getComposite(),
	SWT.BORDER);
	adventureListViewer.getList().setLayoutData(
	new GridData(SWT.FILL, SWT.FILL, false, false));
	adventureListViewer.setLabelProvider(new LabelProvider() {
	public String getText(Object element) {
	return ((Adventure) element).getName();
	}
	});

	getDbc().bind(
	adventureListViewer,
	new Property(selectedCategoryUpdatable,
	"adventures", Adventure.class, Boolean.TRUE), null);

	ConditionalUpdatableValue categorySelectionExistsUpdatable = new ConditionalUpdatableValue(
	selectedCategoryUpdatable) {
	protected boolean compute(Object currentValue) {
	return currentValue != null;
	}
	};

	getDbc().bind(
	new Property(adventureListViewer.getList(),
	SWTProperties.ENABLED),
	categorySelectionExistsUpdatable, null);

	final IUpdatableValue selectedAdventureUpdatable = (IUpdatableValue) getDbc()
	.createUpdatable(
	new Property(adventureListViewer,
	ViewersProperties.SINGLE_SELECTION));

	ConditionalUpdatableValue adventureSelectionExistsUpdatable = new ConditionalUpdatableValue(
	selectedAdventureUpdatable) {
	protected boolean compute(Object currentValue) {
	return currentValue != null;
	}
	};

	final Text txtName = new Text(getComposite(), SWT.BORDER);

	getDbc().bind(
	new Property(txtName, SWTProperties.ENABLED),
	adventureSelectionExistsUpdatable, null);
	getDbc().bind(
	new Property(txtName, SWTProperties.TEXT),
	new Property(selectedAdventureUpdatable, "name",
	String.class, Boolean.FALSE), null);

	assertEquals(txtName.getText(), "");
	assertFalse(txtName.getEnabled());

	final Text txtDescription = new Text(getComposite(), SWT.BORDER);

	getDbc().bind(
	new Property(txtDescription,
	SWTProperties.ENABLED),
	adventureSelectionExistsUpdatable, null);
	getDbc().bind(
	new Property(txtDescription,
	SWTProperties.TEXT),
	new Property(selectedAdventureUpdatable,
	"description", String.class, Boolean.FALSE), null);

	assertFalse(adventureListViewer.getList().isEnabled());
	categoryListViewer.setSelection(new StructuredSelection(
	SampleData.SUMMER_CATEGORY));
	assertTrue(adventureListViewer.getList().isEnabled());
	assertFalse(txtName.getEnabled());
	adventureListViewer.setSelection(new StructuredSelection(
	SampleData.RAFTING_HOLIDAY));
	assertTrue(txtName.getEnabled());
	assertEquals(SampleData.RAFTING_HOLIDAY.getName(), txtName.getText());
	categoryListViewer.setSelection(new StructuredSelection(
	SampleData.WINTER_CATEGORY));
	assertTrue(adventureListViewer.getList().isEnabled());
	assertFalse(txtName.getEnabled());
	}
	}