org.eclipse.bpmn2.modeler.ui.property.editors.BooleanObjectEditor.java Source code

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Here is the source code for org.eclipse.bpmn2.modeler.ui.property.editors.BooleanObjectEditor.java

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/*******************************************************************************
 * Copyright (c) 2011 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.ui.property.editors;

import org.eclipse.bpmn2.modeler.core.utils.ErrorUtils;
import org.eclipse.bpmn2.modeler.ui.property.AbstractBpmn2PropertiesComposite;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.observable.value.IValueChangeListener;
import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.transaction.RecordingCommand;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.FocusListener;
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 object
     * @param feature
     */
    public BooleanObjectEditor(AbstractBpmn2PropertiesComposite parent, EObject obj, EStructuralFeature feat) {
        super(parent, obj, feat);
    }

    public 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);
        button.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 2, 1));
        button.setSelection((Boolean) object.eGet(feature));
        IObservableValue buttonObserver = SWTObservables.observeSelection(button);
        buttonObserver.addValueChangeListener(new IValueChangeListener() {

            @SuppressWarnings("restriction")
            @Override
            public void handleValueChange(ValueChangeEvent event) {

                if (!object.eGet(feature).equals(button.getSelection())) {
                    TransactionalEditingDomain editingDomain = getDiagramEditor().getEditingDomain();
                    editingDomain.getCommandStack().execute(new RecordingCommand(editingDomain) {
                        @Override
                        protected void doExecute() {
                            object.eSet(feature, button.getSelection());
                        }
                    });

                    if (getDiagramEditor().getDiagnostics() != null) {
                        // revert the change and display error status message.
                        button.setSelection((Boolean) object.eGet(feature));
                        ErrorUtils.showErrorMessage(getDiagramEditor().getDiagnostics().getMessage());
                    } else
                        ErrorUtils.showErrorMessage(null);
                }
            }
        });

        button.addFocusListener(new FocusListener() {

            @Override
            public void focusGained(FocusEvent e) {
            }

            @Override
            public void focusLost(FocusEvent e) {
                ErrorUtils.showErrorMessage(null);
            }
        });

        return button;
    }

}