/*
 * @(#)SmartGridLayout.java	1.3 01/11/29
 *
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.swing.colorchooser; 

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.text.*;
import java.io.Serializable;


/**
  * A better GridLayout class
  *
  * @version 1.3 11/29/01
  * @author Steve Wilson
  */
class SmartGridLayout implements LayoutManager, Serializable {

  int rows = 2;
  int columns = 2;
  int xGap = 2;
  int yGap = 2;
  int componentCount = 0;
  Component[][] layoutGrid;


  public SmartGridLayout(int numColumns, int numRows) {
    rows = numRows;
    columns = numColumns;
    layoutGrid = new Component[numColumns][numRows];

  }


  public void layoutContainer(Container c) {

    buildLayoutGrid(c);

    int[] rowHeights = new int[rows];
    int[] columnWidths = new int[columns];
    
    for (int row = 0; row < rows; row++) {
        rowHeights[row] = computeRowHeight(row);
    }

    for (int column = 0; column < columns; column++) {
        columnWidths[column] = computeColumnWidth(column);
    }


    Insets insets = c.getInsets();
    int horizLoc = insets.left;



    for (int column = 0; column < columns; column++) {
      int vertLoc = insets.top;
      
      for (int row = 0; row < rows; row++) {
	Component current = layoutGrid[column][row];
	current.setBounds(horizLoc, vertLoc, columnWidths[column], rowHeights[row]);
	//	System.out.println(current.getBounds());
	vertLoc += (rowHeights[row] + yGap);
      }
      horizLoc += (columnWidths[column] + xGap );
    }
      


  }

  public Dimension minimumLayoutSize(Container c) {

    buildLayoutGrid(c);
    Insets insets = c.getInsets();
    


    int height = 0;
    int width = 0;
    
    for (int row = 0; row < rows; row++) {
        height += computeRowHeight(row);
    }

    for (int column = 0; column < columns; column++) {
        width += computeColumnWidth(column);
    }

    height += (yGap * (rows - 1)) + insets.top + insets.bottom;
    width += (xGap * (columns - 1)) + insets.right + insets.left;

    return new Dimension(width, height);


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

  public void addLayoutComponent(String s, Component c) {}

  public void removeLayoutComponent(Component c) {}


  private void buildLayoutGrid(Container c) {

      Component[] children = c.getComponents();

      for (int componentCount = 0; componentCount < children.length; componentCount++) {
	//	System.out.println("Children: " +componentCount);
	int row = 0;
	int column = 0;

	if (componentCount != 0) {
	  column = componentCount % columns;
	  row = (componentCount - column) / columns;
	}

	//	System.out.println("inserting into: "+ column +  " " + row);
      
	layoutGrid[column][row] = children[componentCount];
      }
  }

  private int computeColumnWidth(int columnNum) {
    int maxWidth = 1;
    for (int row = 0; row < rows; row++) {
      int width = layoutGrid[columnNum][row].getPreferredSize().width;
      if (width > maxWidth) {
	maxWidth = width;
      }
    }
    return maxWidth;
  }

  private int computeRowHeight(int rowNum) {
    int maxHeight = 1;
    for (int column = 0; column < columns; column++) {
      int height = layoutGrid[column][rowNum].getPreferredSize().height;
      if (height > maxHeight) {
	maxHeight = height;
      }
    }
    return maxHeight;
  }

}