src/jexer/bits/MnemonicString.java

   1 /*
   2  * Jexer - Java Text User Interface
   3  *
   4  * The MIT License (MIT)
   5  *
   6  * Copyright (C) 2017 Kevin Lamonte
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  24  * DEALINGS IN THE SOFTWARE.
  25  *
  26  * @author Kevin Lamonte [kevin.lamonte@gmail.com]
  27  * @version 1
  28  */
  29 package jexer.bits;
  30
  31 /**
  32  * MnemonicString is used to render a string like "&File" into a highlighted
  33  * 'F' and the rest of 'ile'.  To insert a literal '&', use two '&&'
  34  * characters, e.g. "&File && Stuff" would be "File & Stuff" with the first
  35  * 'F' highlighted.
  36  */
  37 public final class MnemonicString {
  38
  39     /**
  40      * Keyboard shortcut to activate this item.
  41      */
  42     private char shortcut;
  43
  44     /**
  45      * Get the keyboard shortcut character.
  46      *
  47      * @return the highlighted character
  48      */
  49     public char getShortcut() {
  50         return shortcut;
  51     }
  52
  53     /**
  54      * Location of the highlighted character.
  55      */
  56     private int shortcutIdx = -1;
  57
  58     /**
  59      * Get location of the highlighted character.
  60      *
  61      * @return location of the highlighted character
  62      */
  63     public int getShortcutIdx() {
  64         return shortcutIdx;
  65     }
  66
  67     /**
  68      * The raw (uncolored) string.
  69      */
  70     private String rawLabel;
  71
  72     /**
  73      * Get the raw (uncolored) string.
  74      *
  75      * @return the raw (uncolored) string
  76      */
  77     public String getRawLabel() {
  78         return rawLabel;
  79     }
  80
  81     /**
  82      * Public constructor.
  83      *
  84      * @param label widget label or title.  Label must contain a keyboard
  85      * shortcut, denoted by prefixing a letter with "&", e.g. "&File"
  86      */
  87     public MnemonicString(final String label) {
  88
  89         // Setup the menu shortcut
  90         String newLabel = "";
  91         boolean foundAmp = false;
  92         boolean foundShortcut = false;
  93         int scanShortcutIdx = 0;
  94         for (int i = 0; i < label.length(); i++) {
  95             char c = label.charAt(i);
  96             if (c == '&') {
  97                 if (foundAmp) {
  98                     newLabel += '&';
  99                     scanShortcutIdx++;
 100                 } else {
 101                     foundAmp = true;
 102                 }
 103             } else {
 104                 newLabel += c;
 105                 if (foundAmp) {
 106                     if (!foundShortcut) {
 107                         shortcut = c;
 108                         foundAmp = false;
 109                         foundShortcut = true;
 110                         shortcutIdx = scanShortcutIdx;
 111                     }
 112                 } else {
 113                     scanShortcutIdx++;
 114                 }
 115             }
 116         }
 117         this.rawLabel = newLabel;
 118     }
 119 }