tests/org.eclipse.jface.tests.databinding/src/org/eclipse/jface/tests/internal/databinding/swt/CComboSingleSelectionObservableValueTest.java

/*******************************************************************************
 * Copyright (c) 2007, 2009 Brad Reynolds 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:
 *     Brad Reynolds - initial API and implementation
 *     Ashley Cambrell - bug 198903
 *     Matthew Hall - bug 213145, 194734, 195222
 ******************************************************************************/

package org.eclipse.jface.tests.internal.databinding.swt;

import static org.junit.Assert.assertEquals;

import org.eclipse.core.databinding.observable.IObservable;
import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.jface.databinding.conformance.delegate.AbstractObservableValueContractDelegate;
import org.eclipse.jface.databinding.conformance.swt.SWTMutableObservableValueContractTest;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.jface.databinding.swt.WidgetProperties;
import org.eclipse.jface.tests.databinding.AbstractSWTTestCase;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CCombo;
import org.eclipse.swt.widgets.Shell;
import org.junit.Test;

import junit.framework.TestSuite;

/**
 * @since 3.2
 */
public class CComboSingleSelectionObservableValueTest extends
		AbstractSWTTestCase {
	@Test
	public void testSetValue() throws Exception {
		CCombo combo = new CCombo(getShell(), SWT.NONE);
		IObservableValue observableValue = SWTObservables
				.observeSingleSelectionIndex(combo);
		combo.add("Item1");
		combo.add("Item2");

		assertEquals(-1, combo.getSelectionIndex());
		assertEquals(-1, ((Integer) observableValue.getValue()).intValue());

		Integer value = Integer.valueOf(1);
		observableValue.setValue(value);
		assertEquals("combo selection index", value.intValue(), combo
				.getSelectionIndex());
		assertEquals("observable value", value, observableValue.getValue());

		assertEquals("Item2", combo.getText());
	}

	public static void addConformanceTest(TestSuite suite) {
		suite.addTest(SWTMutableObservableValueContractTest.suite(new Delegate()));
	}

	/* package */static class Delegate extends
			AbstractObservableValueContractDelegate {
		private CCombo combo;
		private Shell shell;

		@Override
		public void setUp() {
			shell = new Shell();
			combo = new CCombo(shell, SWT.NONE);
			combo.add("0");
			combo.add("1");
		}

		@Override
		public void tearDown() {
			shell.dispose();
		}

		@Override
		public IObservableValue createObservableValue(Realm realm) {
			return WidgetProperties.singleSelectionIndex()
					.observe(realm, combo);
		}

		@Override
		public void change(IObservable observable) {
			IObservableValue value = (IObservableValue) observable;
			value.setValue(createValue(value));
		}

		@Override
		public Object getValueType(IObservableValue observable) {
			return Integer.TYPE;
		}

		@Override
		public Object createValue(IObservableValue observable) {
			return Integer.valueOf(_createValue(observable));
		}

		private int _createValue(IObservableValue observable) {
			int value = Math.max(0, combo.getSelectionIndex());

			// returns either 0 or 1 depending upon current value
			return Math.abs(value - 1);
		}
	}
}