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An AWT utility library.
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/*
 *         COMMON DEVELOPMENT AND DISTRIBUTION LICENSE (CDDL) Notice
 *
 * The contents of this file are subject to the COMMON DEVELOPMENT AND DISTRIBUTION LICENSE (CDDL)
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. A copy of the License is available at
 * http://www.opensource.org/licenses/cddl1.txt
 *
 * The Original Code is SoftSmithy Utility Library. The Initial Developer of the
 * Original Code is Florian Brunner (Sourceforge.net user: puce). All Rights Reserved.
 *
 * Contributor(s): .
 */

/*
 * AWTUtilities.java
 *
 * Created on 22. August 2002, 12:34
 */

package org.softsmithy.lib.awt;

import java.awt.*;

/**
 * A collection of utility methods for AWT.
 * @author  puce
 */
public class AWTUtilities {
    
    /**
     * Creates a new instance of this class.
     */
    private AWTUtilities() {
    }
    
    /**
     * Stores the position and size of
     * the inner painting area of the specified container
     * in r and returns r.
     * The position and size specify the bounds of the container,
     * adjusted so as not to include the insets.
     * This method is useful for classes
     * that implement painting code.
     *
     * Copied from SwingUtilities which uses JComponent instead of Container :-(
     * @param c the Container in question; if null, this method returns null
     * @param r the Rectangle instance to be modified;
     *           may be null
     * @return null if the Container is null;
     *         otherwise, returns the passed-in rectangle (if non-null)
     *         or a new rectangle specifying position and size information
     */
    public static Rectangle calculateInnerArea(Container c, Rectangle r) {
        if (c == null) {
            return null;
        }
        Rectangle rect = r;
        Insets insets = c.getInsets();
        
        if (rect == null) {
            rect = new Rectangle();
        }
        
        rect.x = insets.left;
        rect.y = insets.top;
        rect.width = c.getWidth() - insets.left - insets.right;
        rect.height = c.getHeight() - insets.top - insets.bottom;
        
        return rect;
    }
    
  /*
   * Not yet used!
   */
    /**
     * Calculates the center of a Component.
     * @param comp the component
     * @param point if not null, this point is used as return value
     * @return the center of the component
     */
    public static Point calculateCenter(Component comp, Point point) {
        Point center = point;
        Rectangle bounds = comp.getBounds();
        
        if (center == null){
            center = new Point();
        }
        
        center.x = bounds.x + bounds.width/2;
        center.y = bounds.y + bounds.height/2;
        
        return center;
    }
    
}