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    1   /*
    2    * Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   11    * This code is distributed in the hope that it will be useful, but WITHOUT
   12    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   13    * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   14    * version 2 for more details (a copy is included in the LICENSE file that
   15    * accompanied this code).
   16    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   package javax.swing.plaf.basic;
   26   
   27   import javax.swing.ComboBoxEditor;
   28   import javax.swing.JTextField;
   29   import javax.swing.border.Border;
   30   import java.awt.Component;
   31   import java.awt.event;
   32   
   33   import java.lang.reflect.Method;
   34   
   35   /**
   36    * The default editor for editable combo boxes. The editor is implemented as a JTextField.
   37    *
   38    * @author Arnaud Weber
   39    * @author Mark Davidson
   40    */
   41   public class BasicComboBoxEditor implements ComboBoxEditor,FocusListener {
   42       protected JTextField editor;
   43       private Object oldValue;
   44   
   45       public BasicComboBoxEditor() {
   46           editor = createEditorComponent();
   47       }
   48   
   49       public Component getEditorComponent() {
   50           return editor;
   51       }
   52   
   53       /**
   54        * Creates the internal editor component. Override this to provide
   55        * a custom implementation.
   56        *
   57        * @return a new editor component
   58        * @since 1.6
   59        */
   60       protected JTextField createEditorComponent() {
   61           JTextField editor = new BorderlessTextField("",9);
   62           editor.setBorder(null);
   63           return editor;
   64       }
   65   
   66       /**
   67        * Sets the item that should be edited.
   68        *
   69        * @param anObject the displayed value of the editor
   70        */
   71       public void setItem(Object anObject) {
   72           String text;
   73   
   74           if ( anObject != null )  {
   75               text = anObject.toString();
   76               oldValue = anObject;
   77           } else {
   78               text = "";
   79           }
   80           // workaround for 4530952
   81           if (! text.equals(editor.getText())) {
   82               editor.setText(text);
   83           }
   84       }
   85   
   86       public Object getItem() {
   87           Object newValue = editor.getText();
   88   
   89           if (oldValue != null && !(oldValue instanceof String))  {
   90               // The original value is not a string. Should return the value in it's
   91               // original type.
   92               if (newValue.equals(oldValue.toString()))  {
   93                   return oldValue;
   94               } else {
   95                   // Must take the value from the editor and get the value and cast it to the new type.
   96                   Class<?> cls = oldValue.getClass();
   97                   try {
   98                       Method method = cls.getMethod("valueOf", new Class[]{String.class});
   99                       newValue = method.invoke(oldValue, new Object[] { editor.getText()});
  100                   } catch (Exception ex) {
  101                       // Fail silently and return the newValue (a String object)
  102                   }
  103               }
  104           }
  105           return newValue;
  106       }
  107   
  108       public void selectAll() {
  109           editor.selectAll();
  110           editor.requestFocus();
  111       }
  112   
  113       // This used to do something but now it doesn't.  It couldn't be
  114       // removed because it would be an API change to do so.
  115       public void focusGained(FocusEvent e) {}
  116   
  117       // This used to do something but now it doesn't.  It couldn't be
  118       // removed because it would be an API change to do so.
  119       public void focusLost(FocusEvent e) {}
  120   
  121       public void addActionListener(ActionListener l) {
  122           editor.addActionListener(l);
  123       }
  124   
  125       public void removeActionListener(ActionListener l) {
  126           editor.removeActionListener(l);
  127       }
  128   
  129       static class BorderlessTextField extends JTextField {
  130           public BorderlessTextField(String value,int n) {
  131               super(value,n);
  132           }
  133   
  134           // workaround for 4530952
  135           public void setText(String s) {
  136               if (getText().equals(s)) {
  137                   return;
  138               }
  139               super.setText(s);
  140           }
  141   
  142           public void setBorder(Border b) {
  143               if (!(b instanceof UIResource)) {
  144                   super.setBorder(b);
  145               }
  146           }
  147       }
  148   
  149       /**
  150        * A subclass of BasicComboBoxEditor that implements UIResource.
  151        * BasicComboBoxEditor doesn't implement UIResource
  152        * directly so that applications can safely override the
  153        * cellRenderer property with BasicListCellRenderer subclasses.
  154        * <p>
  155        * <strong>Warning:</strong>
  156        * Serialized objects of this class will not be compatible with
  157        * future Swing releases. The current serialization support is
  158        * appropriate for short term storage or RMI between applications running
  159        * the same version of Swing.  As of 1.4, support for long term storage
  160        * of all JavaBeans<sup><font size="-2">TM</font></sup>
  161        * has been added to the <code>java.beans</code> package.
  162        * Please see {@link java.beans.XMLEncoder}.
  163        */
  164       public static class UIResource extends BasicComboBoxEditor
  165       implements javax.swing.plaf.UIResource {
  166       }
  167   }

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