old/org.eclipse.emf.ecp.editor/src/org/eclipse/emf/ecp/editor/mecontrols/MEBoolControl.java

/*******************************************************************************
 * Copyright (c) 2008-2011 Chair for Applied Software Engineering,
 * Technische Universitaet Muenchen.
 * 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:
 ******************************************************************************/
package org.eclipse.emf.ecp.editor.mecontrols;

import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.emf.common.util.Diagnostic;
import org.eclipse.emf.databinding.EMFDataBindingContext;
import org.eclipse.emf.databinding.edit.EMFEditObservables;
import org.eclipse.emf.ecore.EAttribute;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.edit.provider.IItemPropertyDescriptor;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.jface.layout.GridLayoutFactory;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;

/**
 * This is the standard Control to edit boolean values.
 * 
 * @author helming
 */
public class MEBoolControl extends AbstractMEControl implements IValidatableControl{

	private EAttribute attribute;

	private Button check;

	private static final int PRIORITY = 1;

	private Composite composite;
	
	private Label labelWidgetImage;  //Label for diagnostic image


	/**
	 * returns a check button without Label. {@inheritDoc}
	 * 
	 * @return Control
	 */
	@Override
	public Control createControl(Composite parent, int style) {
		Object feature = getItemPropertyDescriptor().getFeature(getModelElement());
		this.attribute = (EAttribute) feature;
		composite = getToolkit().createComposite(parent, style);
		GridLayoutFactory.fillDefaults().numColumns(2).spacing(2, 0).applyTo(composite);
				
		labelWidgetImage = getToolkit().createLabel(composite, "     ");
		labelWidgetImage.setBackground(parent.getBackground());
		labelWidgetImage.setSize(SWT.DEFAULT, 16);

		check = getToolkit().createButton(composite, "", SWT.CHECK);
		IObservableValue model = EMFEditObservables.observeValue(getEditingDomain(), getModelElement(), attribute);
		EMFDataBindingContext dbc = new EMFDataBindingContext();
		dbc.bindValue(SWTObservables.observeSelection(check), model, null, null);
		return composite;
	}

	/**
	 * {@inheritDoc}
	 * 
	 * @see org.eclipse.emf.ecp.editor.mecontrols.AbstractMEControl#canRender(org.eclipse.emf.edit.provider.IItemPropertyDescriptor,
	 *      org.eclipse.emf.ecore.EObject)
	 */
	@Override
	public int canRender(IItemPropertyDescriptor itemPropertyDescriptor, EObject modelElement) {
		Object feature = itemPropertyDescriptor.getFeature(modelElement);
		if (feature instanceof EAttribute && ((EAttribute) feature).getEType().getInstanceClass().equals(boolean.class)) {

			return PRIORITY;
		}
		return AbstractMEControl.DO_NOT_RENDER;
	}

	/**.
	 * {@inheritDoc}}
	 * */
	public void handleValidation(Diagnostic diagnostic) {
		if (diagnostic.getSeverity() == Diagnostic.ERROR || diagnostic.getSeverity() == Diagnostic.WARNING) {
			Image image = org.eclipse.emf.ecp.editor.Activator.getImageDescriptor("icons/validation_error.png").createImage();
			this.labelWidgetImage.setImage(image);
			this.labelWidgetImage.setToolTipText(diagnostic.getMessage());
		}
	}

	/**.
	 * {@inheritDoc}}
	 * */
	public void resetValidation() {
		this.labelWidgetImage.setImage(null);
		this.labelWidgetImage.setToolTipText("");
	}

}