/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2008 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.gui.dialog;

import java.awt.Component;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.AbstractCellEditor;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.JTextField;

import com.rapidminer.gui.properties.PropertyValueCellEditor;
import com.rapidminer.operator.Operator;



/**
 * Editor for attribute weights. A text field for numeric values and three
 * buttons. The first button sets the weight to zero, the second button to 1,
 * and the third resets the value to the old weight. This editor is used by an
 * {@link AttributeWeightsTableModel}.
 * 
 * @author Ingo Mierswa
 * @version $Id: AttributeWeightCellEditor.java,v 2.7 2006/03/21 15:35:40
 *          ingomierswa Exp $
 */
public class AttributeWeightCellEditor extends AbstractCellEditor implements PropertyValueCellEditor {

	private static final long serialVersionUID = 4648838759294286088L;

	private JPanel panel = new JPanel();

	private JTextField textField = new JTextField(12);

	private GridBagLayout gridBagLayout = new GridBagLayout();

	public AttributeWeightCellEditor(double oldValue) {
		super();
		panel.setLayout(gridBagLayout);
		panel.setToolTipText("The weight for this attribute.");
		textField.setToolTipText("The weight for this attribute.");

		GridBagConstraints c = new GridBagConstraints();
		c.fill = GridBagConstraints.BOTH;
		c.weightx = 1;
		gridBagLayout.setConstraints(textField, c);
		panel.add(textField);
		c.weightx = 0;
		addButton(createValueButton("Zero", "0.0"), 1);
		addButton(createValueButton("One", "1.0"), GridBagConstraints.RELATIVE);
		addButton(createValueButton("Reset", oldValue + ""), GridBagConstraints.REMAINDER);
	}
    
    /** Does nothing. */
    public void setOperator(Operator operator) {}

	protected JButton createValueButton(String name, final String newValue) {
		JButton button = new JButton(name);
		button.setMargin(new Insets(0, 0, 0, 0));
		button.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent e) {
				textField.setText(newValue);
				fireEditingStopped();
			}
		});
		button.setToolTipText("Sets the weight of this attribute to " + newValue + ".");
		return button;
	}

	protected void addButton(JButton button, int gridwidth) {
		GridBagConstraints c = new GridBagConstraints();
		c.gridwidth = gridwidth;
		c.weightx = 0;
		c.fill = GridBagConstraints.BOTH;
		gridBagLayout.setConstraints(button, c);
		panel.add(button);
	}

	public Object getCellEditorValue() {
		return (textField.getText().trim().length() == 0) ? null : textField.getText().trim();
	}

	public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int col) {
		textField.setText((value == null) ? "" : value.toString());
		return panel;
	}

	public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
		return getTableCellEditorComponent(table, value, isSelected, row, column);
	}

	public boolean useEditorAsRenderer() {
		return true;
	}
}