/*
 * GNU LESSER GENERAL PUBLIC LICENSE Copyright (C) 2006 The Lobo Project
 * 
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 * 
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 * 
 * Contact info: lobochief@users.sourceforge.net
 */
/*
 * Created on Mar 19, 2005
 */
package com.nvarghese.beowulf.common.cobra.util.gui;

import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.LayoutManager;

/**
 * @author J. H. S.
 */
public class CenterLayout implements LayoutManager {

	public void addLayoutComponent(String arg0, Component arg1) {

	}

	public void removeLayoutComponent(Component arg0) {

	}

	public Dimension preferredLayoutSize(Container arg0) {

		java.awt.Insets insets = arg0.getInsets();
		int count = arg0.getComponentCount();
		if (count > 0) {
			Dimension d = arg0.getComponent(0).getPreferredSize();
			return new Dimension(d.width + insets.left + insets.right, d.height + insets.top + insets.bottom);
		} else {
			return new Dimension(insets.left + insets.right, insets.top + insets.bottom);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.awt.LayoutManager#minimumLayoutSize(java.awt.Container)
	 */
	public Dimension minimumLayoutSize(Container arg0) {

		java.awt.Insets insets = arg0.getInsets();
		int count = arg0.getComponentCount();
		if (count > 0) {
			Dimension d = arg0.getComponent(0).getMinimumSize();
			return new Dimension(d.width + insets.left + insets.right, d.height + insets.top + insets.bottom);
		} else {
			return new Dimension(insets.left + insets.right, insets.top + insets.bottom);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.awt.LayoutManager#layoutContainer(java.awt.Container)
	 */
	public void layoutContainer(Container container) {

		int count = container.getComponentCount();
		if (count > 0) {
			Component child = container.getComponent(0);
			java.awt.Insets insets = container.getInsets();
			int availWidth = container.getWidth() - insets.left - insets.right;
			int availHeight = container.getHeight() - insets.top - insets.bottom;
			Dimension preferredSize = child.getPreferredSize();
			double preferredWidth = preferredSize.getWidth();
			double preferredHeight = preferredSize.getHeight();
			int width;
			int height;
			int x;
			int y;
			if (preferredWidth < availWidth) {
				x = (int) Math.round(insets.left + (availWidth - preferredWidth) / 2);
				width = (int) Math.round(preferredWidth);
			} else {
				x = insets.left;
				width = availWidth;
			}
			if (preferredHeight < availHeight) {
				y = (int) Math.round(insets.top + (availHeight - preferredHeight) / 2);
				height = (int) Math.round(preferredHeight);
			} else {
				y = insets.top;
				height = availHeight;
			}
			child.setBounds(x, y, width, height);
		}
	}

	private static CenterLayout instance = new CenterLayout();

	public static CenterLayout getInstance() {

		return instance;
	}
}