/*******************************************************************************
* Copyright (c) 2005, 2006 IBM Corporation and others.
* 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:
* Peter Centgraf - initial API and implementation - bug #177013
* Jeremy Dowdall - updating
*******************************************************************************/
package org.eclipse.nebula.jface.cdatetime;
import java.util.Date;
import org.eclipse.core.databinding.observable.Diffs;
import org.eclipse.core.databinding.observable.value.AbstractObservableValue;
import org.eclipse.nebula.widgets.cdatetime.CDateTime;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
/**
* An implementation of the DataBindings IObservableValue interface for the
* Nebula CDateTime control.
*
* @author pcentgraf
* @since Mar 8, 2007
*/
public class CDateTimeObservableValue extends AbstractObservableValue {
/**
* The Control being observed here.
*/
protected final CDateTime dateTime;
/**
* 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;
private SelectionListener listener = new SelectionListener() {
@Override
public void widgetDefaultSelected(SelectionEvent e) {
if (!updating) {
Date newSelection = CDateTimeObservableValue.this.dateTime.getSelection();
if (((newSelection != null) && !newSelection.equals(currentSelection))
|| ((currentSelection != null) && !currentSelection.equals(newSelection))) {
fireValueChange(Diffs.createValueDiff(currentSelection, newSelection));
}
currentSelection = newSelection;
}
}
@Override
public void widgetSelected(SelectionEvent e) {
if (!updating) {
Date newSelection = CDateTimeObservableValue.this.dateTime.getSelection();
if (((newSelection != null) && !newSelection.equals(currentSelection))
|| ((currentSelection != null) && !currentSelection.equals(newSelection))) {
fireValueChange(Diffs.createValueDiff(currentSelection, newSelection));
}
currentSelection = newSelection;
}
}
};
/**
* Observe the selection property of the provided CDateTime control.
*
* @param dateTime
* the control to observe
*/
public CDateTimeObservableValue(CDateTime dateTime) {
this.dateTime = dateTime;
currentSelection = dateTime.getSelection();
this.dateTime.addSelectionListener(listener);
}
@Override
public synchronized void dispose() {
dateTime.removeSelectionListener(listener);
super.dispose();
}
@Override
protected Object doGetValue() {
if (!dateTime.isDisposed()) {
return dateTime.getSelection();
}
return null;
}
@Override
protected void doSetValue(Object value) {
if ((value instanceof Date || value == null) && !dateTime.isDisposed()) {
Date oldValue;
Date newValue;
try {
updating = true;
oldValue = dateTime.getSelection();
newValue = (Date) value;
dateTime.setSelection(newValue);
currentSelection = newValue;
if (((oldValue != null) && !oldValue.equals(newValue))
|| ((newValue != null) && !newValue.equals(oldValue))) {
fireValueChange(Diffs.createValueDiff(oldValue, newValue));
}
} finally {
updating = false;
}
}
}
@Override
public Object getValueType() {
return Date.class;
}
}