ui/base/accelerators/accelerator.cc

   1 // Copyright (c) 2012 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/base/accelerators/accelerator.h"
   6
   7 #if defined(OS_WIN)
   8 #include <windows.h>
   9 #endif
  10
  11 #include "base/i18n/rtl.h"
  12 #include "base/logging.h"
  13 #include "base/strings/string_util.h"
  14 #include "base/strings/utf_string_conversions.h"
  15 #include "ui/base/l10n/l10n_util.h"
  16 #include "ui/events/event.h"
  17 #include "ui/strings/grit/ui_strings.h"
  18
  19 #if !defined(OS_WIN) && (defined(USE_AURA) || defined(OS_MACOSX))
  20 #include "ui/events/keycodes/keyboard_code_conversion.h"
  21 #endif
  22
  23 namespace ui {
  24
  25 namespace {
  26
  27 const int kEventFlagsMask = ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN |
  28                             ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN;
  29
  30 }  // namespace
  31
  32 Accelerator::Accelerator()
  33     : key_code_(ui::VKEY_UNKNOWN),
  34       type_(ui::ET_KEY_PRESSED),
  35       modifiers_(0),
  36       is_repeat_(false) {
  37 }
  38
  39 Accelerator::Accelerator(KeyboardCode keycode, int modifiers)
  40     : key_code_(keycode),
  41       type_(ui::ET_KEY_PRESSED),
  42       modifiers_(modifiers),
  43       is_repeat_(false) {
  44 }
  45
  46 Accelerator::Accelerator(const KeyEvent& key_event)
  47     : key_code_(key_event.key_code()),
  48       type_(key_event.type()),
  49       modifiers_(key_event.flags() & kEventFlagsMask),
  50       is_repeat_(key_event.IsRepeat()) {
  51 }
  52
  53 Accelerator::Accelerator(const Accelerator& accelerator) {
  54   key_code_ = accelerator.key_code_;
  55   type_ = accelerator.type_;
  56   modifiers_ = accelerator.modifiers_;
  57   is_repeat_ = accelerator.is_repeat_;
  58   if (accelerator.platform_accelerator_.get())
  59     platform_accelerator_ = accelerator.platform_accelerator_->CreateCopy();
  60 }
  61
  62 Accelerator::~Accelerator() {
  63 }
  64
  65 Accelerator& Accelerator::operator=(const Accelerator& accelerator) {
  66   if (this != &accelerator) {
  67     key_code_ = accelerator.key_code_;
  68     type_ = accelerator.type_;
  69     modifiers_ = accelerator.modifiers_;
  70     is_repeat_ = accelerator.is_repeat_;
  71     if (accelerator.platform_accelerator_.get())
  72       platform_accelerator_ = accelerator.platform_accelerator_->CreateCopy();
  73     else
  74       platform_accelerator_.reset();
  75   }
  76   return *this;
  77 }
  78
  79 bool Accelerator::operator <(const Accelerator& rhs) const {
  80   if (key_code_ != rhs.key_code_)
  81     return key_code_ < rhs.key_code_;
  82   if (type_ != rhs.type_)
  83     return type_ < rhs.type_;
  84   return modifiers_ < rhs.modifiers_;
  85 }
  86
  87 bool Accelerator::operator ==(const Accelerator& rhs) const {
  88   if ((key_code_ == rhs.key_code_) && (type_ == rhs.type_) &&
  89       (modifiers_ == rhs.modifiers_))
  90     return true;
  91
  92   bool platform_equal =
  93       platform_accelerator_.get() && rhs.platform_accelerator_.get() &&
  94       platform_accelerator_.get() == rhs.platform_accelerator_.get();
  95
  96   return platform_equal;
  97 }
  98
  99 bool Accelerator::operator !=(const Accelerator& rhs) const {
 100   return !(*this == rhs);
 101 }
 102
 103 bool Accelerator::IsShiftDown() const {
 104   return (modifiers_ & EF_SHIFT_DOWN) != 0;
 105 }
 106
 107 bool Accelerator::IsCtrlDown() const {
 108   return (modifiers_ & EF_CONTROL_DOWN) != 0;
 109 }
 110
 111 bool Accelerator::IsAltDown() const {
 112   return (modifiers_ & EF_ALT_DOWN) != 0;
 113 }
 114
 115 bool Accelerator::IsCmdDown() const {
 116   return (modifiers_ & EF_COMMAND_DOWN) != 0;
 117 }
 118
 119 bool Accelerator::IsRepeat() const {
 120   return is_repeat_;
 121 }
 122
 123 base::string16 Accelerator::GetShortcutText() const {
 124   int string_id = 0;
 125   switch (key_code_) {
 126     case ui::VKEY_TAB:
 127       string_id = IDS_APP_TAB_KEY;
 128       break;
 129     case ui::VKEY_RETURN:
 130       string_id = IDS_APP_ENTER_KEY;
 131       break;
 132     case ui::VKEY_ESCAPE:
 133       string_id = IDS_APP_ESC_KEY;
 134       break;
 135     case ui::VKEY_SPACE:
 136       string_id = IDS_APP_SPACE_KEY;
 137       break;
 138     case ui::VKEY_PRIOR:
 139       string_id = IDS_APP_PAGEUP_KEY;
 140       break;
 141     case ui::VKEY_NEXT:
 142       string_id = IDS_APP_PAGEDOWN_KEY;
 143       break;
 144     case ui::VKEY_END:
 145       string_id = IDS_APP_END_KEY;
 146       break;
 147     case ui::VKEY_HOME:
 148       string_id = IDS_APP_HOME_KEY;
 149       break;
 150     case ui::VKEY_INSERT:
 151       string_id = IDS_APP_INSERT_KEY;
 152       break;
 153     case ui::VKEY_DELETE:
 154       string_id = IDS_APP_DELETE_KEY;
 155       break;
 156     case ui::VKEY_LEFT:
 157       string_id = IDS_APP_LEFT_ARROW_KEY;
 158       break;
 159     case ui::VKEY_RIGHT:
 160       string_id = IDS_APP_RIGHT_ARROW_KEY;
 161       break;
 162     case ui::VKEY_UP:
 163       string_id = IDS_APP_UP_ARROW_KEY;
 164       break;
 165     case ui::VKEY_DOWN:
 166       string_id = IDS_APP_DOWN_ARROW_KEY;
 167       break;
 168     case ui::VKEY_BACK:
 169       string_id = IDS_APP_BACKSPACE_KEY;
 170       break;
 171     case ui::VKEY_F1:
 172       string_id = IDS_APP_F1_KEY;
 173       break;
 174     case ui::VKEY_F11:
 175       string_id = IDS_APP_F11_KEY;
 176       break;
 177     case ui::VKEY_OEM_COMMA:
 178       string_id = IDS_APP_COMMA_KEY;
 179       break;
 180     case ui::VKEY_OEM_PERIOD:
 181       string_id = IDS_APP_PERIOD_KEY;
 182       break;
 183     case ui::VKEY_MEDIA_NEXT_TRACK:
 184       string_id = IDS_APP_MEDIA_NEXT_TRACK_KEY;
 185       break;
 186     case ui::VKEY_MEDIA_PLAY_PAUSE:
 187       string_id = IDS_APP_MEDIA_PLAY_PAUSE_KEY;
 188       break;
 189     case ui::VKEY_MEDIA_PREV_TRACK:
 190       string_id = IDS_APP_MEDIA_PREV_TRACK_KEY;
 191       break;
 192     case ui::VKEY_MEDIA_STOP:
 193       string_id = IDS_APP_MEDIA_STOP_KEY;
 194       break;
 195     default:
 196       break;
 197   }
 198
 199   base::string16 shortcut;
 200   if (!string_id) {
 201 #if defined(OS_WIN)
 202     // Our fallback is to try translate the key code to a regular character
 203     // unless it is one of digits (VK_0 to VK_9). Some keyboard
 204     // layouts have characters other than digits assigned in
 205     // an unshifted mode (e.g. French AZERY layout has 'a with grave
 206     // accent' for '0'). For display in the menu (e.g. Ctrl-0 for the
 207     // default zoom level), we leave VK_[0-9] alone without translation.
 208     wchar_t key;
 209     if (key_code_ >= '0' && key_code_ <= '9')
 210       key = static_cast<wchar_t>(key_code_);
 211     else
 212       key = LOWORD(::MapVirtualKeyW(key_code_, MAPVK_VK_TO_CHAR));
 213     shortcut += key;
 214 #elif defined(USE_AURA) || defined(OS_MACOSX)
 215     const uint16 c = GetCharacterFromKeyCode(key_code_, false);
 216     if (c != 0)
 217       shortcut +=
 218           static_cast<base::string16::value_type>(base::ToUpperASCII(c));
 219 #endif
 220   } else {
 221     shortcut = l10n_util::GetStringUTF16(string_id);
 222   }
 223
 224   // Checking whether the character used for the accelerator is alphanumeric.
 225   // If it is not, then we need to adjust the string later on if the locale is
 226   // right-to-left. See below for more information of why such adjustment is
 227   // required.
 228   base::string16 shortcut_rtl;
 229   bool adjust_shortcut_for_rtl = false;
 230   if (base::i18n::IsRTL() && shortcut.length() == 1 &&
 231       !base::IsAsciiAlpha(shortcut[0]) && !base::IsAsciiDigit(shortcut[0])) {
 232     adjust_shortcut_for_rtl = true;
 233     shortcut_rtl.assign(shortcut);
 234   }
 235
 236   if (IsShiftDown())
 237     shortcut = l10n_util::GetStringFUTF16(IDS_APP_SHIFT_MODIFIER, shortcut);
 238
 239   // Note that we use 'else-if' in order to avoid using Ctrl+Alt as a shortcut.
 240   // See http://blogs.msdn.com/oldnewthing/archive/2004/03/29/101121.aspx for
 241   // more information.
 242   if (IsCtrlDown())
 243     shortcut = l10n_util::GetStringFUTF16(IDS_APP_CONTROL_MODIFIER, shortcut);
 244   else if (IsAltDown())
 245     shortcut = l10n_util::GetStringFUTF16(IDS_APP_ALT_MODIFIER, shortcut);
 246
 247   if (IsCmdDown()) {
 248 #if defined(OS_MACOSX)
 249     shortcut = l10n_util::GetStringFUTF16(IDS_APP_COMMAND_MODIFIER, shortcut);
 250 #elif defined(OS_CHROMEOS)
 251     shortcut = l10n_util::GetStringFUTF16(IDS_APP_SEARCH_MODIFIER, shortcut);
 252 #else
 253     NOTREACHED();
 254 #endif
 255   }
 256
 257   // For some reason, menus in Windows ignore standard Unicode directionality
 258   // marks (such as LRE, PDF, etc.). On RTL locales, we use RTL menus and
 259   // therefore any text we draw for the menu items is drawn in an RTL context.
 260   // Thus, the text "Ctrl++" (which we currently use for the Zoom In option)
 261   // appears as "++Ctrl" in RTL because the Unicode BiDi algorithm puts
 262   // punctuations on the left when the context is right-to-left. Shortcuts that
 263   // do not end with a punctuation mark (such as "Ctrl+H" do not have this
 264   // problem).
 265   //
 266   // The only way to solve this problem is to adjust the string if the locale
 267   // is RTL so that it is drawn correctly in an RTL context. Instead of
 268   // returning "Ctrl++" in the above example, we return "++Ctrl". This will
 269   // cause the text to appear as "Ctrl++" when Windows draws the string in an
 270   // RTL context because the punctuation no longer appears at the end of the
 271   // string.
 272   //
 273   // TODO(idana) bug# 1232732: this hack can be avoided if instead of using
 274   // views::Menu we use views::MenuItemView because the latter is a View
 275   // subclass and therefore it supports marking text as RTL or LTR using
 276   // standard Unicode directionality marks.
 277   if (adjust_shortcut_for_rtl) {
 278     int key_length = static_cast<int>(shortcut_rtl.length());
 279     DCHECK_GT(key_length, 0);
 280     shortcut_rtl.append(base::ASCIIToUTF16("+"));
 281
 282     // Subtracting the size of the shortcut key and 1 for the '+' sign.
 283     shortcut_rtl.append(shortcut, 0, shortcut.length() - key_length - 1);
 284     shortcut.swap(shortcut_rtl);
 285   }
 286
 287   return shortcut;
 288 }
 289
 290 }  // namespace ui