taverna-uibuilder/src/main/java/org/apache/taverna/lang/uibuilder/Alignment.java

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/

package org.apache.taverna.lang.uibuilder;

import java.awt.Component;
import java.awt.Container;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;

import javax.swing.SwingUtilities;

import org.apache.log4j.Logger;

/**
 * Static utility method to align alignable components within a container
 * 
 * @author Tom Oinn
 * 
 */
public abstract class Alignment {

	private static Logger logger = Logger
	.getLogger(Alignment.class);

	/**
	 * Find all instances of BeanFieldTextArea in the specified container and
	 * set all label widths to the same as the widest of them, aligning the
	 * content areas as a result
	 * 
	 * @param container
	 */
	public static void alignInContainer(Container container) {
		int widestLabel = 0;
		final List<AlignableComponent> fields = new ArrayList<AlignableComponent>();
		for (Component comp : container.getComponents()) {
			if (comp instanceof AlignableComponent) {
				AlignableComponent field = (AlignableComponent) comp;
				int fieldWidth = field.getLabelWidth();
				if (fieldWidth > widestLabel) {
					widestLabel = fieldWidth;
				}
				fields.add(field);
			}
		}
		final int widestLabelVal = widestLabel;
		if (!SwingUtilities.isEventDispatchThread()) {
			try {
				SwingUtilities.invokeAndWait(new Runnable() {
					public void run() {
						for (AlignableComponent field : fields) {
							field.setLabelWidth(widestLabelVal);
						}
					}
				});
			} catch (InterruptedException e) {
				logger.error("", e);
			} catch (InvocationTargetException e) {
				logger.error("", e);
			}
		} else {
			for (AlignableComponent field : fields) {
				field.setLabelWidth(widestLabelVal);
			}
		}
	}

}