GraphFrame.java

/*
Violet - A program for editing UML diagrams.

Copyright (C) 2002 Cay S. Horstmann (http://horstmann.com)

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 com.horstmann.violet.framework;

import java.awt.BorderLayout;
import java.awt.Container;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyVetoException;
import java.beans.VetoableChangeListener;
import java.util.ResourceBundle;

import javax.swing.JInternalFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;


/**
   A frame for showing a graphical editor
*/
public class GraphFrame extends JInternalFrame
{
   /**
      Constructs a graph frame with an empty tool bar
      @param aGraph the initial graph
   */
   public GraphFrame(Graph aGraph)
   {
      graph = aGraph;
      toolBar = new ToolBar(graph);
      panel = new GraphPanel(toolBar);
      Container contentPane = getContentPane();
      contentPane.add(toolBar, BorderLayout.NORTH);
      contentPane.add(new JScrollPane(panel), BorderLayout.CENTER);
      // add listener to confirm frame closing
      addVetoableChangeListener(new
         VetoableChangeListener()
         {
            public void vetoableChange(PropertyChangeEvent event)
               throws PropertyVetoException
            {  
               String name = event.getPropertyName();
               Object value = event.getNewValue();

               // we only want to check attempts to close a frame
               if (name.equals("closed") 
                  && value.equals(Boolean.TRUE) && panel.isModified())
               {  
                  ResourceBundle editorResources = 
                     ResourceBundle.getBundle("com.horstmann.violet.framework.EditorStrings");                  
                  
                  // ask user if it is ok to close
                  int result
                     = JOptionPane.showInternalConfirmDialog(
                        GraphFrame.this, 
                        editorResources.getString("dialog.close.ok"),
                        null,
                        JOptionPane.YES_NO_OPTION);

                  // if the user doesn't agree, veto the close
                  if (result != JOptionPane.YES_OPTION)
                     throw new PropertyVetoException(
                        "User canceled close", event);
               }
            }           
         });

      panel.setGraph(graph);
   }

   /**
      Gets the graph that is being edited in this frame.
      @return the graph
   */
   public Graph getGraph()
   {
      return graph;
   }

   /**
      Gets the graph panel that is contained in this frame.
      @return the graph panel
   */
   public GraphPanel getGraphPanel()
   {
      return panel;
   }

   /**
      Gets the fileName property.
      @return the file name
   */
   public String getFileName()
   {
      return fileName;
   }

   /**
      Sets the fileName property.
      @param newValue the file name
   */
   public void setFileName(String newValue)
   {
      fileName = newValue;
      setTitle(newValue);
   }

   private Graph graph;
   private GraphPanel panel;
   private ToolBar toolBar;
   private String fileName;
}