/*

 * Copyright (c) 1997, 2014, 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;

import sun.reflect.misc.MethodUtil;

/**

 * 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 {

    /**

     * An instance of {@code JTextField}.

     */

    protected JTextField editor;

    private Object oldValue;

    /**

     * Constructs a new instance of {@code BasicComboBoxEditor}.

     */

    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();

            if (text == null) {

                text = "";

            }

            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 = MethodUtil.getMethod(cls, "valueOf", new Class<?>[]{String.class});

                    newValue = MethodUtil.invoke(method, 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);

    }

    @SuppressWarnings("serial") // Superclass is not serializable across versions

    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™

     * has been added to the <code>java.beans</code> package.

     * Please see {@link java.beans.XMLEncoder}.

     */

    @SuppressWarnings("serial") // Same-version serialization only

    public static class UIResource extends BasicComboBoxEditor

    implements javax.swing.plaf.UIResource {

    }

}