content: /*
   *    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., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  /*
   *    FileEditor.java
   *    Copyright (C) 1999 University of Waikato, Hamilton, New Zealand
   *
   */
  
  
  package weka.gui;
  
  import java.awt.Container;
  import java.awt.Dialog;
  import java.awt.FontMetrics;
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  import java.beans.PropertyEditorSupport;
  import java.io.File;
  
  import javax.swing.JFileChooser;
  
  
  /** 
   * A PropertyEditor for File objects that lets the user select a file.
   *
   * @author Len Trigg (trigg@cs.waikato.ac.nz)
   * @version $Revision: 5204 $
   */
  public class FileEditor extends PropertyEditorSupport {
  
    /** The file chooser used for selecting files. */
    protected JFileChooser m_FileChooser;
    
    /**
     * Returns a representation of the current property value as java source.
     *
     * @return a value of type 'String'
     */
    public String getJavaInitializationString() {
  
      File f = (File) getValue();
      if (f == null) {
        return "null";
      }
      return "new File(\"" + f.getName() + "\")";
    }
  
    /**
     * Returns true because we do support a custom editor.
     *
     * @return true
     */
    public boolean supportsCustomEditor() {
      return true;
    }
    
    /**
     * Gets the custom editor component.
     *
     * @return a value of type 'java.awt.Component'
     */
    public java.awt.Component getCustomEditor() {
  
      if (m_FileChooser == null) {
        File currentFile = (File) getValue();
        if (currentFile != null) {
  	m_FileChooser 
  	  = new JFileChooser();
  	m_FileChooser.setSelectedFile(currentFile);
        } else {
  	m_FileChooser 
  	  = new JFileChooser(new File(System.getProperty("user.dir")));
        }
        m_FileChooser.setApproveButtonText("Select");
        m_FileChooser.setApproveButtonMnemonic('S');
        m_FileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
        m_FileChooser.addActionListener(new ActionListener() {
  	public void actionPerformed(ActionEvent e) {
  	  String cmdString = e.getActionCommand();
  	  if (cmdString.equals(JFileChooser.APPROVE_SELECTION)) {
  	    File newVal = m_FileChooser.getSelectedFile();
  	    setValue(newVal);
  	  }
  	  closeDialog();
  	}
        });
      }
      return m_FileChooser;
    }
  
    /**
     * Returns true since this editor is paintable.
     *
     * @return true.
     */
    public boolean isPaintable() {
      return true;
    }
  
    /**
     * Paints a representation of the current Object.
     *
     * @param gfx the graphics context to use
     * @param box the area we are allowed to paint into
     */
    public void paintValue(java.awt.Graphics gfx, java.awt.Rectangle box) {
  
      FontMetrics fm = gfx.getFontMetrics();
      int vpad = (box.height - fm.getHeight()) / 2 ;
      File f = (File) getValue();
      String val = "No file";
      if (f != null) {
        val = f.getName();
      }
      gfx.drawString(val, 2, fm.getHeight() + vpad);
    }  
    
    /**
     * Closes the dialog.
     */
    protected void closeDialog() {
      if (m_FileChooser instanceof Container) {
        Dialog dlg = PropertyDialog.getParentDialog((Container) m_FileChooser);
        if (dlg != null)
  	dlg.setVisible(false);
      }
    }
  }
  
  