Java LayoutManager - AltAlta.java

/**
 * AltAlta.java
 * for the example code, click the link below:
 * http://pastebin.com/AUNZqL58
 * Serdar KUZUCU - http://blog.asosyalbebe.com
 * Java'da Kendi LayoutManager'ımızı Yaratalım
 * http://blog.asosyalbebe.com/2012/02/java-swing-custom-layoutmanager.html
 */
package sedran.layoutManagers;

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

public class AltAlta implements LayoutManager {
    // Space between Components
    private int gap = 5;

    // Default border width
    private int myInsets = 5;

    public AltAlta() {}

    public AltAlta(int gap) {
        this.gap = gap;
    }

    public void addLayoutComponent(String arg0, Component arg1) {}
    public void removeLayoutComponent(Component arg0) {}

    public void layoutContainer(Container parent) {
        int nComp = parent.getComponentCount();
        Dimension d = null;
        int maxWidth = 0;
        for(int i=0; i<nComp; i++) {
            d = parent.getComponent(i).getPreferredSize();
            if( d.width > maxWidth ) {
                maxWidth = d.width;
            }
        }

        Insets borders = parent.getInsets();
        int top = borders.top + myInsets;
        for(int i=0; i<nComp; i++) {
            Component c = parent.getComponent(i);
            d = c.getPreferredSize();
            c.setBounds(borders.left + myInsets, top, maxWidth, d.height);
            top += d.height + gap;
        }
    }

    public Dimension minimumLayoutSize(Container parent) {
        Insets borders = parent.getInsets();
        int nComp = parent.getComponentCount();
        Dimension d = null;
        int maxWidth = 0;
        int sumHeight = 0;
        for(int i=0; i<nComp; i++) {
            d = parent.getComponent(i).getPreferredSize();
            if( d.width > maxWidth ) {
                maxWidth = d.width;
            }
            sumHeight += d.height;
        }
        int height = sumHeight + borders.top + myInsets*2 + borders.bottom + gap*(nComp-1);
        int width = maxWidth + borders.left + borders.right + myInsets*2;
        return new Dimension(width, height);
    }

    public Dimension preferredLayoutSize(Container parent) {
        return minimumLayoutSize(parent);
    }
}