es.cv.gvcase.fefem.common.databinding.CDateTimeObservableValue.java Source code

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/***************************************************************************
 * Copyright (c) 2010 Conselleria de Infraestructuras y Transporte,
 * Generalitat de la Comunitat Valenciana . 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: Miguel Llacer San Fernando - (Prodevelop)
 *
 **************************************************************************/
package es.cv.gvcase.fefem.common.databinding;

import java.util.Date;

import org.eclipse.core.databinding.observable.Diffs;
import org.eclipse.core.databinding.observable.value.AbstractObservableValue;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.nebula.widgets.cdatetime.CDateTime;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;

/**
 * The Class CDateTimeObservableValue.
 */
public class CDateTimeObservableValue extends AbstractObservableValue implements IObservableValue {

    /** The Control being observed here. */
    protected final CDateTime cDateTime;

    /** Flag to prevent infinite recursion in {@link #doSetValue(Object)}. */
    protected boolean updating = false;

    /** The "old" selection before a selection event is fired. */
    protected Date currentSelection;

    /** Old value. */
    private Date oldValue;

    /**
     * Instantiates a new c date time observable value.
     * 
     * @param cDateTime
     *            the c date time
     */
    public CDateTimeObservableValue(CDateTime cDateTime) {
        super(SWTObservables.getRealm(cDateTime.getDisplay()));
        this.cDateTime = cDateTime;
        currentSelection = cDateTime.getSelection();

        cDateTime.addDisposeListener(disposeListener);
        cDateTime.addListener(SWT.Modify, updateListener);
    }

    /** The dispose listener. */
    private DisposeListener disposeListener = new DisposeListener() {
        public void widgetDisposed(DisposeEvent e) {
            CDateTimeObservableValue.this.dispose();
        }
    };

    /** The update listener. */
    private Listener updateListener = new Listener() {
        public void handleEvent(Event event) {
            if (!updating) {
                Date newValue = cDateTime.getSelection();

                if (newValue == null)
                    return;

                if (!newValue.equals(oldValue)) {
                    fireValueChange(Diffs.createValueDiff(oldValue, newValue));
                    oldValue = newValue;
                }
            }
        }
    };

    @Override
    protected Object doGetValue() {
        return cDateTime.getSelection();
    }

    public Object getValueType() {
        return Date.class;
    }

    protected void doSetValue(Object value) {
        Date newValue;
        try {
            updating = true;
            oldValue = cDateTime.getSelection();
            newValue = (Date) value;
            cDateTime.setSelection(newValue);
            currentSelection = newValue;
            fireValueChange(Diffs.createValueDiff(oldValue, newValue));

        } finally {
            updating = false;
        }
    }

}