plugins/org.eclipse.bpmn2.modeler.core/src/org/eclipse/bpmn2/modeler/core/merrimac/dialogs/BooleanObjectEditor.java

/*******************************************************************************
 * Copyright (c) 2011, 2012 Red Hat, Inc.
 *  All rights reserved.
 * This program is 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:
 * Red Hat, Inc. - initial API and implementation
 *
 * @author Bob Brodt
 ******************************************************************************/

package org.eclipse.bpmn2.modeler.core.merrimac.dialogs;

import org.eclipse.bpmn2.modeler.core.merrimac.clad.AbstractDetailComposite;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;
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.Composite;
import org.eclipse.swt.widgets.Control;

/**
 * @author Bob Brodt
 *
 */
public class BooleanObjectEditor extends ObjectEditor {

	protected Button button;
	
	/**
	 * @param businessObject
	 * @param feature
	 */
	public BooleanObjectEditor(AbstractDetailComposite parent, EObject obj, EStructuralFeature feat) {
		super(parent, obj, feat);
	}
	
	protected Control createControl(Composite composite, String label, int style) {

		// create a separate label to the LEFT of the checkbox, otherwise the grid layout will
		// be off by one column for all other widgets that are created after this one.
		createLabel(composite, label);
		
		button = getToolkit().createButton(composite, "", SWT.CHECK); //$NON-NLS-1$
		button.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 2, 1));
		button.setSelection(getValue());
		button.addSelectionListener( new SelectionListener() {

			@Override
			public void widgetSelected(SelectionEvent e) {
				if (!isWidgetUpdating) {
					boolean checked = button.getSelection();
					setValue(new Boolean(checked));
					button.setSelection(getValue());
				}
			}

			@Override
			public void widgetDefaultSelected(SelectionEvent e) {
			}
			
		});
		
		return button;
	}

	@Override
	public Boolean getValue() {
		Object v = getBusinessObjectDelegate().getValue(object, feature);
		if (v instanceof Boolean)
			return (Boolean)v;
		if (v instanceof String) {
			if ("true".equalsIgnoreCase((String)v)) //$NON-NLS-1$
				return Boolean.TRUE;
			// translate integer values as strings
			try {
				if (Integer.parseInt((String)v)!=0)
					return Boolean.TRUE;
			}
			catch(Exception e) {}
		}
		if (v instanceof Integer && ((Integer)v).intValue()!=0) {
			return Boolean.TRUE;
		}
		return Boolean.FALSE;
	}

	@Override
	public void notifyChanged(Notification notification) {
		super.notifyChanged(notification);
		if ( notification.getEventType() == -1 ||
				(object == notification.getNotifier() && feature == notification.getFeature())) {
			Object value = getValue();
			if (value==null) {
				value = Boolean.FALSE;
			}
			else {
				value = Boolean.parseBoolean(value.toString());
			}
			button.setSelection((Boolean) value);
		}
	}
	
	public void setVisible(boolean visible) {
		super.setVisible(visible);
		button.setVisible(visible);
		GridData data = (GridData)button.getLayoutData();
		data.exclude = !visible;
	}
	
	public void dispose() {
		super.dispose();
		if (button!=null && !button.isDisposed()) {
			button.dispose();
			button = null;
		}
	}
	
	public Control getControl() {
		return button;
	}
}