plugins/org.eclipse.viatra2.editor.text/src/org/eclipse/viatra2/editor/text/light/VTEColorProvider.java

/*******************************************************************************
 * Copyright (c) 2004-2008 Istvan Rath and Daniel Varro
 * 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:
 *    Istvan Rath - initial API and implementation
 *******************************************************************************/

 package org.eclipse.viatra2.editor.text.light;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.preference.PreferenceConverter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Display;
import org.eclipse.viatra2.editor.text.Activator;

public class VTEColorProvider
{

	private static final RGB RGB_DEFAULT = new RGB(58, 58, 58);
	private static final RGB RGB_KEYWORD = new RGB(42, 34, 127);
	public static final RGB RGB_STRING = new RGB(255, 0, 42);
	public static final RGB RGB_COMMENT = new RGB(63, 127, 95);

	protected Map<Object, Color> fColorTable= new HashMap<Object, Color>(10);

	public static void initializeDefaults(IPreferenceStore aStore)
	{
		PreferenceConverter.setDefault(aStore,IVTEConstants.COLOR_DEFAULT, RGB_DEFAULT);
		PreferenceConverter.setDefault(aStore,IVTEConstants.COLOR_KEYWORD, RGB_KEYWORD);
		PreferenceConverter.setDefault(aStore,IVTEConstants.COLOR_STRING, RGB_STRING);
		PreferenceConverter.setDefault(aStore,IVTEConstants.COLOR_COMMENT, RGB_COMMENT);
	}

	/**
	 * Release all of the color resources held onto by the receiver.
	 */
	public void dispose()
	{
		Iterator<Color> e= fColorTable.values().iterator();
		while (e.hasNext())
			 e.next().dispose();
	}


	public Color getColor(String aName)
	{
		Color color = fColorTable.get(aName);
		if (color == null) {
			IPreferenceStore store = Activator.getDefault().getPreferenceStore();
			RGB rgb = PreferenceConverter.getColor(store,
								   IVTEConstants.PREFIX_COLOR + aName);
			if (rgb != null)
			{
				color = new Color(Display.getCurrent(), rgb);
			}
			else
			{
				color = Display.getCurrent().getSystemColor(SWT.COLOR_LIST_FOREGROUND);
			}
			fColorTable.put(aName, color);
			fColorTable.put(rgb, color);
		}
		return color;
	}

	public Color getColor(RGB rgb) {
		Color color = fColorTable.get(rgb);
		if (color == null) {
			color = new Color(Display.getCurrent(), rgb);
			fColorTable.put(rgb, color);
		}
		return color;
	}

}