org.eclipse.emf.ecp.editor.mecontrols.MEBoolControl.java Source code

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Here is the source code for org.eclipse.emf.ecp.editor.mecontrols.MEBoolControl.java

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/*******************************************************************************
 * 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("");
    }

}