//==============================================================================
//	
//	Copyright (c) 2002-
//	Authors:
//	* Andrew Hinton <ug60axh@cs.bham.ac.uk> (University of Birmingham)
//	* Dave Parker <david.parker@comlab.ox.ac.uk> (University of Oxford, formerly University of Birmingham)
//	
//------------------------------------------------------------------------------
//	
//	This file is part of PRISM.
//	
//	PRISM 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.
//	
//	PRISM 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 PRISM; if not, write to the Free Software Foundation,
//	Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//	
//==============================================================================

package userinterface.util;

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

import javax.swing.JTable;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.border.EmptyBorder;

import prism.Prism;
import prism.PrismLangException;

/**
 * This does not store an expression, it actually maintains a string which is
 * tested for its validity with the PRISM parser
 */
public class ExpressionProperty extends SingleProperty
{

	protected Prism pr;

	private boolean valid;

	/** Creates a new instance of ExpressionProperty */
	public ExpressionProperty(PropertyOwner owner, String name, String value, Prism pr)
	{
		this(owner, name, value, "", pr);
	}

	public ExpressionProperty(PropertyOwner owner, String name, String value, String comment, Prism pr)
	{
		super(owner, name, "", "", true, comment);
		this.pr = pr;
		valid = true;
		area = new JTextArea();
		area.setLineWrap(false);
		area.setOpaque(true);
		try {
			setProperty(value);
		} catch (Exception e) {
		}
	}

	public String getExpression()
	{
		return (String) getProperty();
	}

	public void setProperty(Object property) throws PropertyException
	{
		String expression = property.toString();
		try {
			if (pr == null)
				throw new PrismLangException("");
			if (!expression.equals("")) {
				Prism.parseSingleExpressionString(expression);
			}
			valid = true;
		} catch (PrismLangException e) {
			valid = false;
		}
		super.setProperty(property);
	}

	public void setEnabled(boolean enabled)
	{
		super.setEnabled(enabled);

		if (area != null)
			area.setEnabled(enabled);
	}

	JTextArea area;

	public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
	{
		////System.out.println("rendering "+value.toString());
		if (isSelected) {
			area.setForeground(table.getSelectionForeground());
			area.setBackground(table.getSelectionBackground());
		} else {
			area.setForeground(table.getForeground());
			area.setBackground(table.getBackground());
		}

		area.setFont(table.getFont());

		if (hasFocus) {
			area.setBorder(UIManager.getBorder("Table.focusCellHighlightBorder"));
			if (table.isCellEditable(row, column)) {
				area.setForeground(UIManager.getColor("Table.focusCellForeground"));
				area.setBackground(UIManager.getColor("Table.focusCellBackground"));
			}
		} else {
			area.setBorder(new EmptyBorder(0, 2, 2, 1));
		}
		//area.setBackground( Color.yellow);
		area.setMargin(new Insets(0, 2, 4, 2));
		area.setText((value == null) ? "" : toString());

		if (!valid) {
			area.setForeground(Color.red);

		}
		return area;
	}
}