package org.jtheque.utils.ui;

 /*

  * This file is part of JTheque.

  *

  * JTheque 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 3 of the License.

  *

  * JTheque 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 JTheque.  If not, see <http://www.gnu.org/licenses/>.

  */

 import javax.swing.JTextField;

 import javax.swing.text.AttributeSet;

 import javax.swing.text.BadLocationException;

 import javax.swing.text.DocumentFilter;

 import java.awt.Toolkit;

 /**

  * A document filter used to limit the length of a field. This filter avert the user with a popup when he go to

  * the limit.

  *

  * @author Baptiste Wicht

  */

 public final class DocumentLengthFilterAvert extends DocumentLengthFilter {

     private DisplayPopupThread thread;

     private final JTextField field;

     /**

      * Construct a new <code>DocumentLengthFilterAvert</code> associated with a specific field and with a

      * maximum number of characters.

      *

      * @param max   The maximum numbers of characters.

      * @param field The field we want to associate to fhe filter.

      */

     public DocumentLengthFilterAvert(int max, JTextField field) {

         super(max);

         this.field = field;

     }

     @Override

     public void remove(FilterBypass fb, int offset, int length) throws BadLocationException {

         replace(fb, offset, length, "", null);

     }

     @Override

     public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String str,

                         AttributeSet attrs) throws BadLocationException {

         if (str != null) {

             int newLength = fb.getDocument().getLength() - length + str.length();

             if (thread != null) {

                 thread.close();

             }

             if (newLength <= getMax()) {

                 fb.replace(offset, length, str, attrs);

             } else {

                 Toolkit.getDefaultToolkit().beep();

                 thread = new DisplayPopupThread(field);

                 thread.start();

             }

         }

     }

 }