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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "ui/events/keycodes/keyboard_code_conversion.h"
      6 
      7 #include "ui/events/event_constants.h"
      8 
      9 namespace ui {
     10 
     11 uint16 GetCharacterFromKeyCode(KeyboardCode key_code, int flags) {
     12   const bool ctrl = (flags & EF_CONTROL_DOWN) != 0;
     13   const bool shift = (flags & EF_SHIFT_DOWN) != 0;
     14   const bool upper = shift ^ ((flags & EF_CAPS_LOCK_DOWN) != 0);
     15 
     16   // Following Windows behavior to map ctrl-a ~ ctrl-z to \x01 ~ \x1A.
     17   if (key_code >= VKEY_A && key_code <= VKEY_Z)
     18     return key_code - VKEY_A + (ctrl ? 1 : (upper ? 'A' : 'a'));
     19 
     20   // Other ctrl characters
     21   if (ctrl) {
     22     if (shift) {
     23       // following graphics chars require shift key to input.
     24       switch (key_code) {
     25         // ctrl-@ maps to \x00 (Null byte)
     26         case VKEY_2:
     27           return 0;
     28         // ctrl-^ maps to \x1E (Record separator, Information separator two)
     29         case VKEY_6:
     30           return 0x1E;
     31         // ctrl-_ maps to \x1F (Unit separator, Information separator one)
     32         case VKEY_OEM_MINUS:
     33           return 0x1F;
     34         // Returns 0 for all other keys to avoid inputting unexpected chars.
     35         default:
     36           return 0;
     37       }
     38     } else {
     39       switch (key_code) {
     40         // ctrl-[ maps to \x1B (Escape)
     41         case VKEY_OEM_4:
     42           return 0x1B;
     43         // ctrl-\ maps to \x1C (File separator, Information separator four)
     44         case VKEY_OEM_5:
     45           return 0x1C;
     46         // ctrl-] maps to \x1D (Group separator, Information separator three)
     47         case VKEY_OEM_6:
     48           return 0x1D;
     49         // ctrl-Enter maps to \x0A (Line feed)
     50         case VKEY_RETURN:
     51           return 0x0A;
     52         // Returns 0 for all other keys to avoid inputting unexpected chars.
     53         default:
     54           return 0;
     55       }
     56     }
     57   }
     58 
     59   // For IME support.
     60   if (key_code == ui::VKEY_PROCESSKEY)
     61     return 0xE5;
     62 
     63   // Normal characters
     64   if (key_code >= VKEY_0 && key_code <= VKEY_9) {
     65     return shift ? ")!@#$%^&*("[key_code - VKEY_0] :
     66         static_cast<uint16>(key_code);
     67   } else if (key_code >= VKEY_NUMPAD0 && key_code <= VKEY_NUMPAD9) {
     68     return key_code - VKEY_NUMPAD0 + '0';
     69   }
     70 
     71   switch (key_code) {
     72     case VKEY_TAB:
     73       return '\t';
     74     case VKEY_RETURN:
     75       return '\r';
     76     case VKEY_MULTIPLY:
     77       return '*';
     78     case VKEY_ADD:
     79       return '+';
     80     case VKEY_SUBTRACT:
     81       return '-';
     82     case VKEY_DECIMAL:
     83       return '.';
     84     case VKEY_DIVIDE:
     85       return '/';
     86     case VKEY_SPACE:
     87       return ' ';
     88     case VKEY_OEM_1:
     89       return shift ? ':' : ';';
     90     case VKEY_OEM_PLUS:
     91       return shift ? '+' : '=';
     92     case VKEY_OEM_COMMA:
     93       return shift ? '<' : ',';
     94     case VKEY_OEM_MINUS:
     95       return shift ? '_' : '-';
     96     case VKEY_OEM_PERIOD:
     97       return shift ? '>' : '.';
     98     case VKEY_OEM_2:
     99       return shift ? '?' : '/';
    100     case VKEY_OEM_3:
    101       return shift ? '~' : '`';
    102     case VKEY_OEM_4:
    103       return shift ? '{' : '[';
    104     case VKEY_OEM_5:
    105       return shift ? '|' : '\\';
    106     case VKEY_OEM_6:
    107       return shift ? '}' : ']';
    108     case VKEY_OEM_7:
    109       return shift ? '"' : '\'';
    110     default:
    111       return 0;
    112   }
    113 }
    114 
    115 }  // namespace ui
    116