colorcelleditor.java

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/**    
  * Copyright (C) 2006, Laboratorio di Valutazione delle Prestazioni - Politecnico di Milano

  * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
  
package jmt.gui.common.editors;

import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/**
 * <p>Title: Color Cell Editor</p>
 * <p>Description: Implements both a TableCellRender component and a TableCellEditor to add
 * support for managing colors into table's field. The render will display a rectangle
 * with defined Color while the editor will show a panel to chose the color from.</p>
 * 
 * @author Bertoli Marco
 *         Date: 15-giu-2005
 *         Time: 12.27.22
 */
public class ColorCellEditor extends AbstractCellEditor
                         implements TableCellEditor, CellEditor,
                                    ActionListener, TableCellRenderer {
    Color currentColor;
    JButton button;
    static JColorChooser colorChooser = new JColorChooser();
    protected static final String EDIT = "edit";

    Border unselectedBorder = null;
    Border selectedBorder = null;
    JLabel label = new JLabel();

    /**
     * Creates a new ColorCellEditor. This object will act as a Renderer or Editor.
     */
    public ColorCellEditor() {
        button = new JButton();
        button.setActionCommand(EDIT);
        button.addActionListener(this);
        button.setBorderPainted(false);
        label.setOpaque(true);
    }

    /**
     * Handles events from the editor button and from
     * the dialog's OK button.
     */
    public void actionPerformed(ActionEvent e) {
        if (EDIT.equals(e.getActionCommand())) {
            //The user has clicked the cell, so
            //bring up the dialog.
            button.setBackground(currentColor);
            colorChooser.setColor(currentColor);
            JDialog dialog = JColorChooser.createDialog(button,
                                            "Choose User Class Color",
                                            true,  //modal
                                            colorChooser,
                                            this,  //OK button handler
                                            null); //no CANCEL button handler
            Dimension scrDim = Toolkit.getDefaultToolkit().getScreenSize();
            dialog.setBounds((scrDim.width-dialog.getWidth())/2,
                    (scrDim.height-dialog.getHeight())/2,
                    dialog.getWidth(),dialog.getHeight());
            dialog.setVisible(true);

            //Make the renderer reappear.
            fireEditingStopped();

        } else { //User pressed dialog's "OK" button.
            currentColor = colorChooser.getColor();
        }
    }

    //Implement the one CellEditor method that AbstractCellEditor doesn't.
    public Object getCellEditorValue() {
        return currentColor;
    }

    //Implement the one method defined by TableCellEditor.
    public Component getTableCellEditorComponent(JTable table,
                                                 Object value,
                                                 boolean isSelected,
                                                 int row,
                                                 int column) {
        currentColor = (Color)value;
        return button;
    }

    /**
     *  Returns TableCellRendererComponent used to show a rectangle of the right color in the table
     */
    public Component getTableCellRendererComponent(
                            JTable table, Object color,
                            boolean isSelected, boolean hasFocus,
                            int row, int column) {
        Color newColor = (Color)color;
        label.setBackground(newColor);
        if (isSelected) {
            if (selectedBorder == null) {
                selectedBorder = BorderFactory.createMatteBorder(2,5,2,5,
                        table.getSelectionBackground());
            }
            label.setBorder(selectedBorder);
        } else {
            if (unselectedBorder == null) {
                unselectedBorder = BorderFactory.createMatteBorder(2,5,2,5,
                        table.getBackground());
            }
            label.setBorder(unselectedBorder);
        }
        return label;
    }

}