/*
 * $Id: TextCursorImpl.java 535 2008-02-19 06:02:50Z weiju $
 * 
 * Created on 2006/01/23
 * Copyright 2005-2008 by Wei-ju Wu
 * This file is part of The Z-machine Preservation Project (ZMPP).
 *
 * ZMPP 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 3 of the License, or
 * (at your option) any later version.
 *
 * ZMPP 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 ZMPP.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.zmpp.swingui;

import org.zmpp.vm.TextCursor;

/**
 * This class is the default implementation of the TextCursor interface. It
 * holds the cursor position in the current unit measure, which is in V6 and
 * characters in all other versions.
 *
 * @author Wei-ju Wu
 * @version 1.0
 */
public class TextCursorImpl implements TextCursor {

    /**
     * The current line.
     */
    private int line;

    /**
     * The current column.
     */
    private int column;

    /**
     * The window this cursor is contained in.
     */
    private CursorWindow window;

    /**
     * Constructor.
     */
    public TextCursorImpl(CursorWindow window) {

        this.line = 1;
        this.column = 1;
        this.window = window;
    }

    /**
     * {@inheritDoc}
     */
    public int getLine() {
        return line;
    }

    /**
     * {@inheritDoc}
     */
    public int getColumn() {
        return column;
    }

    /**
     * {@inheritDoc}
     */
    public void setPosition(int line, int column) {

        setLine(line);
        setColumn(column);
        window.updateCursorCoordinates();
    }

    /**
     * {@inheritDoc}
     */
    public void setLine(int line) {

        this.line = (line > 0) ? line : 1;
    }

    /**
     * {@inheritDoc}
     */
    public void setColumn(int column) {

        this.column = (column > 0) ? column : 1;
    }
}