001    /*
002     * Copyright (c) 2005 Einar Pehrson <einar@pehrson.nu>.
003     *
004     * This file is part of
005     * CleanSheets - a spreadsheet application for the Java platform.
006     *
007     * CleanSheets is free software; you can redistribute it and/or modify
008     * it under the terms of the GNU General Public License as published by
009     * the Free Software Foundation; either version 2 of the License, or
010     * (at your option) any later version.
011     *
012     * CleanSheets is distributed in the hope that it will be useful,
013     * but WITHOUT ANY WARRANTY; without even the implied warranty of
014     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
015     * GNU General Public License for more details.
016     *
017     * You should have received a copy of the GNU General Public License
018     * along with CleanSheets; if not, write to the Free Software
019     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
020     */
021    package csheets.ui.ctrl;
022    
023    import java.awt.KeyboardFocusManager;
024    import java.beans.PropertyChangeEvent;
025    import java.beans.PropertyChangeListener;
026    
027    import csheets.ui.sheet.SpreadsheetTable;
028    
029    /**
030     * An action to be invoked on the spreadsheet table that is the focus owner.
031     * @author Einar Pehrson
032     */
033    public abstract class FocusOwnerAction extends BaseAction implements PropertyChangeListener {
034    
035            /** The current focus owner */
036            protected SpreadsheetTable focusOwner;
037    
038            /**
039             * Creates a new focus owner action.
040             */
041            public FocusOwnerAction() {
042                    KeyboardFocusManager.getCurrentKeyboardFocusManager()
043                            .addPropertyChangeListener("permanentFocusOwner", this);
044            }
045    
046            /**
047             * Stores the focus owner
048             * @param event the event that was fired
049             */
050            public void propertyChange(PropertyChangeEvent event) {
051                    Object o = event.getNewValue();
052                    if (o instanceof SpreadsheetTable)
053                            focusOwner = (SpreadsheetTable)o;
054            }
055    }