org.pmedv.blackboard.commands.UndoCommand.java Source code

Introduction

Here is the source code for org.pmedv.blackboard.commands.UndoCommand.java

Source

/**
    
   BlackBoard breadboard designer
   Written and maintained by Matthias Pueski 
       
   Copyright (c) 2010-2011 Matthias Pueski
       
   This program 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.
       
   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.
    
 */

package org.pmedv.blackboard.commands;

import java.awt.event.ActionEvent;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;

import javax.swing.Action;
import javax.swing.JOptionPane;
import javax.swing.KeyStroke;
import javax.swing.undo.CannotUndoException;
import javax.swing.undo.UndoManager;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.pmedv.blackboard.EditorUtils;
import org.pmedv.blackboard.components.BoardEditor;
import org.pmedv.blackboard.events.EditorChangedEvent;
import org.pmedv.blackboard.events.EditorChangedListener;
import org.pmedv.core.commands.AbstractCommand;
import org.pmedv.core.context.AppContext;
import org.pmedv.core.gui.ApplicationWindow;
import org.springframework.context.ApplicationContext;

public class UndoCommand extends AbstractCommand implements EditorChangedListener {

    private static final long serialVersionUID = -811608125040391612L;

    private static final Log log = LogFactory.getLog(UndoCommand.class);

    public UndoCommand() {
        putValue(Action.NAME, resources.getResourceByKey("UndoCommand.name"));
        putValue(Action.SMALL_ICON, resources.getIcon("icon.undo"));
        putValue(Action.SHORT_DESCRIPTION, resources.getResourceByKey("UndoCommand.description"));
        putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke(KeyEvent.VK_Z, InputEvent.CTRL_DOWN_MASK));
        setEnabled(false);
    }

    @Override
    public void execute(ActionEvent e) {
        ApplicationContext ctx = AppContext.getContext();
        ApplicationWindow win = ctx.getBean(ApplicationWindow.class);
        BoardEditor editor = EditorUtils.getCurrentActiveEditor();
        UndoManager undoManager = editor.getUndoManager();

        try {

            try {
                undoManager.undo();
            } catch (CannotUndoException c) {
                JOptionPane.showMessageDialog(win, resources.getResourceByKey("msg.cantundo"),
                        resources.getResourceByKey("msg.error"), JOptionPane.ERROR_MESSAGE);
            }

        } catch (CannotUndoException e1) {
            log.warn("Cannot undo.");
            e1.printStackTrace();
        }

        ctx.getBean(RedoCommand.class).setEnabled(undoManager.canRedo());
        ctx.getBean(UndoCommand.class).setEnabled(undoManager.canUndo());
    }

    @Override
    public void editorChanged(EditorChangedEvent event) {

        if (event.getEditor() == null) {
            setEnabled(false);
        } else {
            setEnabled(event.getEditor().getUndoManager().canUndo());
        }

    }

}