source: src/main/java/weka/gui/sql/ResultSetTableCellRenderer.java @ 16

/*
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 * ResultSetTableCellRenderer.java
 * Copyright (C) 2005 University of Waikato, Hamilton, New Zealand
 *
 */

package weka.gui.sql;

import java.awt.Color;
import java.awt.Component;

import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
import javax.swing.table.DefaultTableCellRenderer;

/**
 * Handles the background colors for missing values differently than the
 * DefaultTableCellRenderer.
 *
 * @author     FracPete (fracpete at waikato dot ac dot nz)
 * @version    $Revision: 1.2 $
 */
public class ResultSetTableCellRenderer
  extends DefaultTableCellRenderer {

  /** for serialization */
  private static final long serialVersionUID = -8106963669703497351L;
  
  // the color for missing values
  private Color           missingColor;
  private Color           missingColorSelected;

  /**
   * initializes the Renderer with a standard color
   */
  public ResultSetTableCellRenderer() {
    this( new Color(223, 223, 223), 
          new Color(192, 192, 192) );
  }

  /**
   * initializes the Renderer with the given colors
   */
  public ResultSetTableCellRenderer( Color missingColor, 
                                     Color missingColorSelected ) {

    super();

    this.missingColor           = missingColor;
    this.missingColorSelected   = missingColorSelected;
  }

  /**
   * Returns the default table cell renderer.
   * stuff for the header is taken from <a href="http://www.chka.de/swing/table/faq.html">here</a>
   */
  public Component getTableCellRendererComponent(
      JTable table, Object value, boolean isSelected, 
      boolean hasFocus, int row, int column ) {

    ResultSetTableModel       model;
    Component                 result;
    boolean                   found;

    result = super.getTableCellRendererComponent(
        table, value, isSelected, hasFocus, row, column);

    if (table.getModel() instanceof ResultSetTableModel) {
      model = (ResultSetTableModel) table.getModel();
      // normal cell
      if (row >= 0) {
        if (model.isNullAt(row, column)) {
          setToolTipText("NULL");
          if (isSelected)
            result.setBackground(missingColorSelected);
          else
            result.setBackground(missingColor);
        }
        else {
          setToolTipText(null);
          if (isSelected)
            result.setBackground(table.getSelectionBackground());
          else
            result.setBackground(Color.WHITE);
        }

        // alignment
        if (model.isNumericAt(column))
          setHorizontalAlignment(SwingConstants.RIGHT);
        else
          setHorizontalAlignment(SwingConstants.LEFT);
      }
      // header
      else {
        setBorder(UIManager.getBorder("TableHeader.cellBorder"));
        setHorizontalAlignment(SwingConstants.CENTER);
        if (table.getColumnModel().getSelectionModel().isSelectedIndex(column))
          result.setBackground(UIManager.getColor("TableHeader.background").darker());
        else
          result.setBackground(UIManager.getColor("TableHeader.background"));
      }
    }

    return result;
  }
}