/* * Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */package javax.swing.plaf.basic; import javax.swing.ComboBoxEditor;import javax.swing.JTextField;import javax.swing.border.Border;import java.awt.Component;import java.awt.event.*; import java.lang.reflect.Method; /** * The default editor for editable combo boxes. The editor is implemented as a JTextField. * * @author Arnaud Weber * @author Mark Davidson */public class BasicComboBoxEditor implements ComboBoxEditor,FocusListener {    protected JTextField editor;    private Object oldValue;     public BasicComboBoxEditor() {        editor = createEditorComponent();    }     public Component getEditorComponent() {        return editor;    }     /**     * Creates the internal editor component. Override this to provide     * a custom implementation.     *     * @return a new editor component     * @since 1.6     */    protected JTextField createEditorComponent() {        JTextField editor = new BorderlessTextField("",9);        editor.setBorder(null);        return editor;    }     /**     * Sets the item that should be edited.     *     * @param anObject the displayed value of the editor     */    public void setItem(Object anObject) {        String text;         if ( anObject != null )  {            text = anObject.toString();            oldValue = anObject;        } else {            text = "";        }        // workaround for 4530952        if (! text.equals(editor.getText())) {            editor.setText(text);        }    }     public Object getItem() {        Object newValue = editor.getText();         if (oldValue != null && !(oldValue instanceof String))  {            // The original value is not a string. Should return the value in it's            // original type.            if (newValue.equals(oldValue.toString()))  {                return oldValue;            } else {                // Must take the value from the editor and get the value and cast it to the new type.                Class<?> cls = oldValue.getClass();                try {                    Method method = cls.getMethod("valueOf", new Class[]{String.class});                    newValue = method.invoke(oldValue, new Object[] { editor.getText()});                } catch (Exception ex) {                    // Fail silently and return the newValue (a String object)                }            }        }        return newValue;    }     public void selectAll() {        editor.selectAll();        editor.requestFocus();    }     // This used to do something but now it doesn't.  It couldn't be    // removed because it would be an API change to do so.    public void focusGained(FocusEvent e) {}     // This used to do something but now it doesn't.  It couldn't be    // removed because it would be an API change to do so.    public void focusLost(FocusEvent e) {}     public void addActionListener(ActionListener l) {        editor.addActionListener(l);    }     public void removeActionListener(ActionListener l) {        editor.removeActionListener(l);    }     static class BorderlessTextField extends JTextField {        public BorderlessTextField(String value,int n) {            super(value,n);        }         // workaround for 4530952        public void setText(String s) {            if (getText().equals(s)) {                return;            }            super.setText(s);        }         public void setBorder(Border b) {            if (!(b instanceof UIResource)) {                super.setBorder(b);            }        }    }     /**     * A subclass of BasicComboBoxEditor that implements UIResource.     * BasicComboBoxEditor doesn't implement UIResource     * directly so that applications can safely override the     * cellRenderer property with BasicListCellRenderer subclasses.     * <p>     * <strong>Warning:</strong>     * Serialized objects of this class will not be compatible with     * future Swing releases. The current serialization support is     * appropriate for short term storage or RMI between applications running     * the same version of Swing.  As of 1.4, support for long term storage     * of all JavaBeans<sup><font size="-2">TM</font></sup>     * has been added to the <code>java.beans</code> package.     * Please see {@link java.beans.XMLEncoder}.     */    public static class UIResource extends BasicComboBoxEditor    implements javax.swing.plaf.UIResource {    }}