1 /*
   2  * Copyright (c) 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 
  26 package javax.swing.colorchooser;
  27 
  28 import java.awt.event.FocusEvent;
  29 import java.awt.event.FocusListener;
  30 import java.text.ParseException;
  31 import static java.util.Locale.ENGLISH;
  32 import javax.swing.JFormattedTextField;
  33 import javax.swing.JFormattedTextField.AbstractFormatter;
  34 import javax.swing.SwingConstants;
  35 import javax.swing.SwingUtilities;
  36 import javax.swing.text.AttributeSet;
  37 import javax.swing.text.BadLocationException;
  38 import javax.swing.text.DefaultFormatterFactory;
  39 import javax.swing.text.DocumentFilter;
  40 
  41 final class ValueFormatter extends AbstractFormatter implements FocusListener, Runnable {
  42 
  43     static void init(int length, boolean hex, JFormattedTextField text) {
  44         ValueFormatter formatter = new ValueFormatter(length, hex);
  45         text.setColumns(length);
  46         text.setFormatterFactory(new DefaultFormatterFactory(formatter));
  47         text.setHorizontalAlignment(SwingConstants.RIGHT);
  48         text.setMinimumSize(text.getPreferredSize());
  49         text.addFocusListener(formatter);
  50     }
  51 
  52     private final DocumentFilter filter = new DocumentFilter() {
  53         @Override
  54         public void remove(FilterBypass fb, int offset, int length) throws BadLocationException {
  55             if (isValid(fb.getDocument().getLength() - length)) {
  56                 fb.remove(offset, length);
  57             }
  58         }
  59 
  60         @Override
  61         public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet set) throws BadLocationException {
  62             if (isValid(fb.getDocument().getLength() + text.length() - length) && isValid(text)) {
  63                 fb.replace(offset, length, text.toUpperCase(ENGLISH), set);
  64             }
  65         }
  66 
  67         @Override
  68         public void insertString(FilterBypass fb, int offset, String text, AttributeSet set) throws BadLocationException {
  69             if (isValid(fb.getDocument().getLength() + text.length()) && isValid(text)) {
  70                 fb.insertString(offset, text.toUpperCase(ENGLISH), set);
  71             }
  72         }
  73     };
  74 
  75     private final int length;
  76     private final int radix;
  77 
  78     private JFormattedTextField text;
  79 
  80     ValueFormatter(int length, boolean hex) {
  81         this.length = length;
  82         this.radix = hex ? 16 : 10;
  83     }
  84 
  85     @Override
  86     public Object stringToValue(String text) throws ParseException {
  87         try {
  88             return Integer.valueOf(text, this.radix);
  89         }
  90         catch (NumberFormatException nfe) {
  91             ParseException pe = new ParseException("illegal format", 0);
  92             pe.initCause(nfe);
  93             throw pe;
  94         }
  95     }
  96 
  97     @Override
  98     public String valueToString(Object object) throws ParseException {
  99         if (object instanceof Integer) {
 100             if (this.radix == 10) {
 101                 return object.toString();
 102             }
 103             int value = (Integer) object;
 104             int index = this.length;
 105             char[] array = new char[index];
 106             while (0 < index--) {
 107                 array[index] = Character.forDigit(value & 0x0F, this.radix);
 108                 value >>= 4;
 109             }
 110             return new String(array).toUpperCase(ENGLISH);
 111         }
 112         throw new ParseException("illegal object", 0);
 113     }
 114 
 115     @Override
 116     protected DocumentFilter getDocumentFilter() {
 117         return this.filter;
 118     }
 119 
 120     public void focusGained(FocusEvent event) {
 121         Object source = event.getSource();
 122         if (source instanceof JFormattedTextField) {
 123             this.text = (JFormattedTextField) source;
 124             SwingUtilities.invokeLater(this);
 125         }
 126     }
 127 
 128     public void focusLost(FocusEvent event) {
 129     }
 130 
 131     public void run() {
 132         if (this.text != null) {
 133             this.text.selectAll();
 134         }
 135     }
 136 
 137     private boolean isValid(int length) {
 138         return (0 <= length) && (length <= this.length);
 139     }
 140 
 141     private boolean isValid(String text) {
 142         int length = text.length();
 143         for (int i = 0; i < length; i++) {
 144             char ch = text.charAt(i);
 145             if (Character.digit(ch, this.radix) < 0) {
 146                 return false;
 147             }
 148         }
 149         return true;
 150     }
 151 }