/**
 * DialogLayout's class is design to implement LayoutManager
 * instead of using the default implementation from the default
 * Java's implementation. I take the code straight from "Swing"
 * book in the chapter that talks about Layout.
 * @author Matthew Robinson and Pavel Vorobiev
 */
import java.awt.*;
import java.util.*;

public class DialogLayout implements LayoutManager
{
 protected int m_divider = -1;
 protected int m_hGap = 10; // horizontal gap
 protected int m_vGap = 5; // vertical gap

 public DialogLayout(int hGap, int vGap)
 {
  m_hGap = hGap;
  m_vGap = vGap;
 }

 public void addLayoutComponent(String name, Component comp)
 { }

 public void removeLayoutComponent(Component comp)
 { }

 public Dimension preferredLayoutSize(Container parent)
 {
  int divider = getDivider(parent);
  int w = 0;
  int h = 0;
  for(int k=1; k<parent.getComponentCount();k+=2)
  {
   Component comp = parent.getComponent(k);
   Dimension d = comp.getPreferredSize();
   w = Math.max(w, d.width);
   h += d.height + m_vGap;
  }
  h -= m_vGap;
  Insets insets = parent.getInsets();
  return new Dimension(divider+w+insets.left+insets.right,
                       h+insets.top+insets.bottom);
 }
 
 public Dimension minimumLayoutSize(Container parent)
 {
  return preferredLayoutSize(parent);
 }
 
 public void layoutContainer(Container parent)
 {
  int divider = getDivider(parent);
  Insets insets = parent.getInsets();
  int w = parent.getWidth() - insets.left - insets.right
          - divider;
  int x = insets.left;
  int y = insets.top;

  for(int k=1; k<parent.getComponentCount(); k+=2)
  {
   Component comp1 = parent.getComponent(k-1);
   Component comp2 = parent.getComponent(k);
   Dimension d = comp2.getPreferredSize();
   comp1.setBounds(x,y, divider-m_hGap, d.height);
   comp2.setBounds(x+divider,y,w,d.height);
   y += d.height + m_vGap;
  }
 }

 public int getHGap()
 {
  return m_hGap;
 }

 public int getVGap()
 {
  return m_vGap;
 }

 public void setDivider(int divider)
 {
  if(divider > 0)
    m_divider = divider;
 }

 public int getDivider()
 {
  return m_divider;
 }

 public int getDivider(Container parent)
 {
  if(m_divider > 0)
    return m_divider;
  int divider = 0;
  for(int k=0; k<parent.getComponentCount();k+=2)
  {
   Component comp = parent.getComponent(k);
   Dimension d = comp.getPreferredSize();
   divider = Math.max(divider, d.width);
  }
  divider += m_hGap;
  return divider;
 }

 public String toString()
 {
  return getClass().getName()+"[hgap="+m_hGap+",vgap="
         + m_vGap + ",divider=" + m_divider+"]";
 }
}