/******************************************************************************
 * Product: Posterita Ajax UI 												  *
 * Copyright (C) 2007 Posterita Ltd.  All Rights Reserved.                    *
 * This program is free software; you can redistribute it and/or modify it    *
 * under the terms version 2 of the GNU General Public License as published   *
 * by the Free Software Foundation. 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.,    *
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.                     *
 * For the text or an alternative of this public license, you may reach us    *
 * Posterita Ltd., 3, Draper Avenue, Quatre Bornes, Mauritius                 *
 * or via info@posterita.org or http://www.posterita.org/                     *
 *****************************************************************************/

package org.adempiere.webui.event;

import org.adempiere.webui.component.ListModelTable;
import org.zkoss.zul.ListModel;
import org.zkoss.zul.event.ListDataEvent;

/**
 * Change event for {@link ListModelTable} 
 * @author andy
 */
public class WTableModelEvent extends ListDataEvent
{

    /** Specifies all rows. */
    public static final int ALL_ROWS = -1;
	/** Specifies all columns in a row or rows. */
	public static final int ALL_COLUMNS = -1;
    /** Identifies the header row. */
    public static final int HEADER_ROW = -1;

	//
	// Instance Variables
	//
	protected int m_column;

	/**
	 * All row data in the table has changed, listeners should discard any state
	 * that was based on the rows and requery the <code>TableModel</code> to
	 * get the new row count and all the appropriate values.<br/> 
	 * The <code>WListbox</code> will initiate repaint on receiving this event, 
	 * querying the model for the cell values that are visible.<br/> 
	 *
	 * @param source	The list model that has changed
	 */
	public WTableModelEvent(ListModel<?> source)
	{
		// Use Integer.MAX_VALUE instead of getRowCount() in case rows were
		// deleted.
		this(source, 0, Integer.MAX_VALUE, ALL_COLUMNS, CONTENTS_CHANGED);
	}

	/**
	 * This row of data has been updated. To denote the arrival of a completely
	 * new table with a different structure use <code>HEADER_ROW</code> as the
	 * value for the <code>row</code> argument.
	 *
	 * @param source	The list model that has changed
	 * @param row		Index of the affected row
	 */
	public WTableModelEvent(ListModel<?> source, int row)
	{
		this(source, row, row, ALL_COLUMNS, CONTENTS_CHANGED);
	}

	/**
	 * The cell in [<I>row</I>,<I>column</I>] has been updated.
	 *
	 * @param source	The list model that has changed
	 * @param row		Index of the affected row
	 * @param column	Index of the affected column
	 */
	public WTableModelEvent(ListModel<?> source, int row, int column)
	{
		this(source, row, row, column, CONTENTS_CHANGED);
	}

	/**
	 * The cells from (firstRow, column) to (lastRow, column) have been changed.
	 * The <I>column</I> refers to the column index of the cell in the model's
	 * co-ordinate system. When <I>column</I> is ALL_COLUMNS, all cells in the
	 * specified range of rows are considered changed.
	 * <p>
	 * The <I>type</I> should be one of: CONTENTS_CHANGED,  INTERVAL_ADDED, INTERVAL_REMOVED.
	 *
	 * @param source	The list model that has changed
	 * @param firstRow	Index of the first affected row
	 * @param lastRow	Index of the last affected row
	 * @param column	Index of the affected column
	 * @param type		the type of change
	 */
	public WTableModelEvent(ListModel<?> source, int firstRow, int lastRow,
			int column, int type)
	{
		super(source, type, firstRow, lastRow);

		m_column = column;
	}

	/**
	 * Returns the column for the event. If the return value is <code>ALL_COLUMNS</code> it
	 * means every column in the specified row has been affected.
	 *
	 * @return the affected column, or {@link #ALL_COLUMNS}
	 */
	public int getColumn()
	{
		return m_column;
	};

	/**
	 * Obtain the index of the first affected row
	 *
	 * @return the index of the first affected row
	 */
	public int getFirstRow()
	{
		return getIndex0();
	}

	/**
	 * Obtain the index of the last affected row
	 *
	 * @return the index of the last affected row
	 */
	public int getLastRow()
	{
		return getIndex1();
	}
}
