TextAreaRenderer.java

/*

   TextAreaRenderer.java

   This Module encapsulates some more user interactions with a Jtable,
   including right click menus to sort and remove columns

   Created: 26 January 2006

   Module By: James Ratcliff, falazar@arlut.utexas.edu

   -----------------------------------------------------------------------

   Ganymede Directory Management System

   Copyright (C) 1996-2013
   The University of Texas at Austin

   Ganymede is a registered trademark of The University of Texas at Austin

   Contact information

   Author Email: ganymede_author@arlut.utexas.edu
   Email mailing list: ganymede@arlut.utexas.edu

   US Mail:
   Computer Science Division
   Applied Research Laboratories
   The University of Texas at Austin
   PO Box 8029, Austin TX 78713-8029

   Telephone: (512) 835-3200

   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, see <http://www.gnu.org/licenses/>.

*/

package arlut.csd.JTable;

import javax.swing.*;
import javax.swing.table.*;
import java.awt.*;
import java.util.*;


/*------------------------------------------------------------------------------
                                                                           class
                                                                TextAreaRenderer

------------------------------------------------------------------------------*/

public class TextAreaRenderer extends JTextArea implements TableCellRenderer
{
  private final DefaultTableCellRenderer adaptee = new DefaultTableCellRenderer();

  /**
   * map from table to map of rows to map of column heights
   */

  private final HashMap<JTable, HashMap<Integer, HashMap<Integer, Integer>>> cellSizes =
    new HashMap<JTable, HashMap<Integer, HashMap<Integer, Integer>>>();

  /**
   * Cached FontMetrics object, used to calculate the necessary width
   * for a specific string in the SmartTable's optimizeColumns()
   * method.
   */

  private FontMetrics metrics = null;

  /* -- */

  public TextAreaRenderer()
  {
    setLineWrap(true);
    setWrapStyleWord(true);
  }

  public Component getTableCellRendererComponent(JTable table, Object obj, boolean isSelected,
                                                 boolean hasFocus, int row, int column)
  {
    // set the colours, etc. using the standard for that platform
    adaptee.getTableCellRendererComponent(table, obj, isSelected, hasFocus, row, column);
    setForeground(adaptee.getForeground());
    setBackground(adaptee.getBackground());
    setBorder(adaptee.getBorder());
    setFont(adaptee.getFont());

    metrics = this.getFontMetrics(adaptee.getFont());

    setText(adaptee.getText());

    // This line was very important to get it working with JDK1.4

    TableColumnModel columnModel = table.getColumnModel();
    setSize(columnModel.getColumn(column).getWidth(), 100000);

    int height_wanted = (int) getPreferredSize().getHeight();
    addSize(table, row, column, height_wanted);
    height_wanted = findTotalMaximumRowSize(table, row);

    if (height_wanted > 0 && height_wanted != table.getRowHeight(row))
      {
        table.setRowHeight(row, height_wanted);
      }

    return this;
  }

  /**
   * Returns the necessary width required to render obj with this
   * renderer, given the table's defined font.
   */

  public int getUnwrappedWidth(JTable table, Object obj)
  {
    if (obj == null)
      {
        return 0;
      }

    if (metrics == null)
      {
        metrics = this.getFontMetrics(table.getFont());
      }

    return metrics.stringWidth(obj.toString());
  }

  private void addSize(JTable table, int row, int column, int height)
  {
    HashMap<Integer, HashMap<Integer, Integer>> rows = cellSizes.get(table);

    if (rows == null)
      {
        rows = new HashMap<Integer, HashMap<Integer, Integer>>();
        cellSizes.put(table, rows);
      }

    HashMap<Integer, Integer> rowheights = rows.get(Integer.valueOf(row));

    if (rowheights == null)
      {
        rowheights = new HashMap<Integer, Integer>();
        rows.put(Integer.valueOf(row), rowheights);
      }

    rowheights.put(Integer.valueOf(column), Integer.valueOf(height));
  }

  /**
   * Look through all columns and get the renderer.  If it is
   * also a TextAreaRenderer, we look at the maximum height in
   * its hash table for this row.
   */

  private int findTotalMaximumRowSize(JTable table, int row)
  {
    int maximum_height = 0;
    Enumeration columns = table.getColumnModel().getColumns();

    while (columns.hasMoreElements())
      {
        TableColumn tc = (TableColumn) columns.nextElement();
        TableCellRenderer cellRenderer = tc.getCellRenderer();

        if (cellRenderer instanceof TextAreaRenderer)
          {
            TextAreaRenderer tar = (TextAreaRenderer) cellRenderer;
            maximum_height = Math.max(maximum_height, tar.findMaximumRowSize(table, row));
          }
      }

    return maximum_height;
  }

  private int findMaximumRowSize(JTable table, int row)
  {
    Map rows = (Map) cellSizes.get(table);

    if (rows == null)
      {
        return 0;
      }

    Map rowheights = (Map) rows.get(Integer.valueOf(row));

    if (rowheights == null)
      {
        return 0;
      }

    int maximum_height = 0;

    for (Iterator it = rowheights.entrySet().iterator(); it.hasNext();)
      {
        Map.Entry entry = (Map.Entry) it.next();
        int cellHeight = ((Integer) entry.getValue()).intValue();
        maximum_height = Math.max(maximum_height, cellHeight);
      }

    return maximum_height;
  }
}