/* 
 * Copyright (c) 2006 Stiftung Deutsches Elektronen-Synchroton, 
 * Member of the Helmholtz Association, (DESY), HAMBURG, GERMANY.
 *
 * THIS SOFTWARE IS PROVIDED UNDER THIS LICENSE ON AN "../AS IS" BASIS. 
 * WITHOUT WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED 
 * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE AND 
 * NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE 
 * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR 
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. SHOULD THE SOFTWARE PROVE DEFECTIVE 
 * IN ANY RESPECT, THE USER ASSUMES THE COST OF ANY NECESSARY SERVICING, REPAIR OR 
 * CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. 
 * NO USE OF ANY SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.
 * DESY HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, 
 * OR MODIFICATIONS.
 * THE FULL LICENSE SPECIFYING FOR THE SOFTWARE THE REDISTRIBUTION, MODIFICATION, 
 * USAGE AND OTHER RIGHTS AND OBLIGATIONS IS INCLUDED WITH THE DISTRIBUTION OF THIS 
 * PROJECT IN THE FILE LICENSE.HTML. IF THE LICENSE IS NOT INCLUDED YOU MAY FIND A COPY 
 * AT HTTP://WWW.DESY.DE/LEGAL/LICENSE.HTM
 */
package org.csstudio.sds.ui.internal.properties;

import org.eclipse.jface.viewers.DialogCellEditor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.FontDialog;
import org.eclipse.swt.widgets.Label;

/**
 * A cell editor for fonts.
 * 
 * @author Alexander Will
 * @version $Revision: 1.2 $
 * 
 */
public final class FontCellEditor extends DialogCellEditor {
	/**
	 * The composite widget.
	 */
	private Composite _composite;

	/**
	 * The label widget showing the FontData values.
	 */
	private Label _fontLabel;

	/**
	 * Creates a new font cell editor parented under the given control. The cell
	 * editor value is <code>null</code> initially, and has no validator.
	 * 
	 * @param parent
	 *            the parent control
	 */
	public FontCellEditor(final Composite parent) {
		this(parent, SWT.NONE);
	}

	/**
	 * Creates a new font cell editor parented under the given control. The cell
	 * editor value is <code>null</code> initially, and has no validator.
	 * 
	 * @param parent
	 *            the parent control
	 * @param style
	 *            the style bits
	 */
	public FontCellEditor(final Composite parent, final int style) {
		super(parent, style);
		doSetValue(new FontData("Arial", 8, SWT.NONE)); //$NON-NLS-1$
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected Control createContents(final Composite cell) {
		Color bg = cell.getBackground();
		_composite = new Composite(cell, getStyle());
		_composite.setBackground(bg);
		_composite.setLayout(new FillLayout());
		_fontLabel = new Label(_composite, SWT.LEFT);
		_fontLabel.setBackground(bg);
		_fontLabel.setFont(cell.getFont());
		return _composite;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected Object openDialogBox(final Control cellEditorWindow) {
		FontDialog dialog = new FontDialog(cellEditorWindow.getShell());
		Object value = getValue();
		if (value != null) {
			FontData[] fontData = new FontData[] { (FontData) value };
			dialog.setFontList(fontData);
		}
		value = dialog.open();
		return dialog.getFontList()[0];
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void updateContents(final Object value) {
		FontData font = (FontData) value;
		if (font == null) {
			font = new FontData("Arial", 8, SWT.NONE); //$NON-NLS-1$
		}

		_fontLabel.setText("(" + font.getName() + "," + font.getHeight() + ")"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
	}
}