pcombofocuslistener.java

更方便的SWING

/*
 * PSwing Utilities -- Nifty Swing Widgets
 * Copyright (C) 2002  Pallas Technology
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * Pallas Technology
 * 1170 HOWELL MILL RD NW
 * SUITE 306
 * ATLANTA GEORGIA 30318
 * 
 * PHONE [phone]
 * EMAIL [e-mail]
 * 
 * www.pallastechnology.com
 **************************************************************************
 * $Archive: SwingTools$
 * $FileName: PComboFocusListener.java$
 * $FileID: 14$
 *
 * Last change:
 * $AuthorName: Rob MacGrogan$
 * $Date: 1/28/03 8:05 PM$
 * $VerID: 54$
 * $Comment: Add GLPL text.$
 **************************************************************************/
package com.pallas.swing.pcombobox;

import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;

/**
 * Title:   $FileName: PComboFocusListener.java$
 * @version $VerNum: 3$
 * @author $AuthorName: Rob MacGrogan$<br><br>
 * 
 * $Description: Focus listener for PComboBox.$<br>
 * $KeyWordsOff: $<br><br>
 */
public class PComboFocusListener implements FocusListener {

  private FullWordComboKeySelectionModel mgr = null;
  
  public PComboFocusListener(FullWordComboKeySelectionModel mgr){
    this.mgr = mgr;
  }

  /**
   * @see java.awt.event.FocusListener#focusGained(FocusEvent)
   */
  public void focusGained(FocusEvent arg0) {
    if (mgr != null){
      mgr.getField().selectAll();
      mgr.block = false;
    }
  }

  /**
   * @see java.awt.event.FocusListener#focusLost(FocusEvent)
   */
  public void focusLost(FocusEvent arg0) {
    if (mgr != null){
      //Check if user blanked out field.
      if (mgr.getField().getText() == null ||
          mgr.getField().getText().equals("")){
        //select top item (which should be "default").
        mgr.getParent().setSelectedIndex(0);
      }
      //Reset caret.
      mgr.getField().setCaretPosition(0);
      mgr.block = true;
    }
  }

}