/* (swing1.1beta3) */
package tame.table;

import java.awt.Component;
import java.awt.Dimension;
import java.util.Enumeration;
import java.util.Vector;

import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;

/** ColumnGroup.
@author Nobuo Tamemasa
@version 1.0 10/20/98
*/
public class ColumnGroup {
  protected TableCellRenderer renderer;
  protected Vector v;
  protected String text;
  protected int margin=0;

  public ColumnGroup(String text) {
    this(null,text);
  }

  public ColumnGroup(TableCellRenderer renderer,String text) {
    if (renderer == null) {
      this.renderer = new DefaultTableCellRenderer() {
	public Component getTableCellRendererComponent(JTable table, Object value,
                         boolean isSelected, boolean hasFocus, int row, int column) {
	  JTableHeader header = table.getTableHeader();
	  if (header != null) {
	    setForeground(header.getForeground());
	    setBackground(header.getBackground());
	    setFont(header.getFont());
	  }
          setHorizontalAlignment(JLabel.CENTER);
          setText((value == null) ? "" : value.toString());
	  setBorder(UIManager.getBorder("TableHeader.cellBorder"));
	  return this;
        }
      };
    } else {
      this.renderer = renderer;
    }
    this.text = text;
    v = new Vector();
  }

  /**
  param obj    TableColumn or ColumnGroup
  */
  public void add(Object obj) {
    if (obj == null) { return; }
    v.addElement(obj);
  }

  /**
  param c    TableColumn
  param v    ColumnGroups
  */
  public Vector getColumnGroups(TableColumn c, Vector g) {
    g.addElement(this);
    if (v.contains(c)) return g;
    Enumeration enum = v.elements();
    while (enum.hasMoreElements()) {
      Object obj = enum.nextElement();
      if (obj instanceof ColumnGroup) {
        Vector groups =
          (Vector)((ColumnGroup)obj).getColumnGroups(c,(Vector)g.clone());
        if (groups != null) return groups;
      }
    }
    return null;
  }

  public TableCellRenderer getHeaderRenderer() {
    return renderer;
  }

  public void setHeaderRenderer(TableCellRenderer renderer) {
    if (renderer != null) {
      this.renderer = renderer;
    }
  }

  public Object getHeaderValue() {
    return text;
  }

  public Dimension getSize(JTable table) {
    Component comp = renderer.getTableCellRendererComponent(
        table, getHeaderValue(), false, false,-1, -1);
    int height = comp.getPreferredSize().height;
    int width  = 0;
    Enumeration enum = v.elements();
    while (enum.hasMoreElements()) {
      Object obj = enum.nextElement();
      if (obj instanceof TableColumn) {
        TableColumn aColumn = (TableColumn)obj;
        width += aColumn.getWidth();
        width += margin;
      } else {
        width += ((ColumnGroup)obj).getSize(table).width;
      }
    }
    return new Dimension(width, height);
  }

  public void setColumnMargin(int margin) {
    this.margin = margin;
    Enumeration enum = v.elements();
    while (enum.hasMoreElements()) {
      Object obj = enum.nextElement();
      if (obj instanceof ColumnGroup) {
        ((ColumnGroup)obj).setColumnMargin(margin);
      }
    }
  }
}