bundles/org.eclipse.e4.ui.css.swt/src/org/eclipse/e4/ui/css/swt/properties/AbstractConvertedCSSPropertySWTHandler.java

/*******************************************************************************
 * Copyright (c) 2008 Angelo Zerr 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:
 *     Angelo Zerr <angelo.zerr@gmail.com> - initial API and implementation
 *******************************************************************************/
package org.eclipse.e4.ui.css.swt.properties;

import org.eclipse.e4.ui.css.core.engine.CSSEngine;
import org.eclipse.swt.widgets.Control;
import org.w3c.dom.css.CSSValue;

public abstract class AbstractConvertedCSSPropertySWTHandler extends
		AbstractCSSPropertySWTHandler {

	protected void applyCSSProperty(Control control, String property,
			CSSValue value, String pseudo, CSSEngine engine) throws Exception {
		Object toType = getToType(value);
		if (toType != null) {
			Object newValue = engine.convert(value, toType, control
					.getDisplay());
			// if (newValue != null)
			applyCSSPropertyValue(control, property, newValue, pseudo, engine);
			// else
			// applyCSSPropertyValue(control, property, value, pseudo, engine);
		} else {
			applyCSSPropertyValue(control, property, value, pseudo, engine);
		}
	}

	protected String retrieveCSSProperty(Object value, String pseudo, CSSEngine engine) {
		Object toType = getToType(value);
		if (toType != null) {
			try {
				String newValue = engine.convert(value, toType, null);
				return newValue;
			} catch (Exception e) {

			}
		}
		return null;
	}

	protected abstract void applyCSSPropertyValue(Control control,
			String property, Object value, String pseudo, CSSEngine engine)
			throws Exception;

	protected abstract Object getToType(Object value);

}