blob: 79c72cbf270abebccf54cf6939df14f25816fda3 [file] [log] [blame]
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "views/accelerator.h"
#if defined(OS_WIN)
#include <windows.h>
#elif defined(OS_LINUX)
#include <gdk/gdk.h>
#endif
#include "base/i18n/rtl.h"
#include "base/logging.h"
#include "base/string_util.h"
#include "base/utf_string_conversions.h"
#include "grit/ui_strings.h"
#include "ui/base/l10n/l10n_util.h"
namespace views {
string16 Accelerator::GetShortcutText() const {
int string_id = 0;
switch(key_code_) {
case ui::VKEY_TAB:
string_id = IDS_APP_TAB_KEY;
break;
case ui::VKEY_RETURN:
string_id = IDS_APP_ENTER_KEY;
break;
case ui::VKEY_ESCAPE:
string_id = IDS_APP_ESC_KEY;
break;
case ui::VKEY_PRIOR:
string_id = IDS_APP_PAGEUP_KEY;
break;
case ui::VKEY_NEXT:
string_id = IDS_APP_PAGEDOWN_KEY;
break;
case ui::VKEY_END:
string_id = IDS_APP_END_KEY;
break;
case ui::VKEY_HOME:
string_id = IDS_APP_HOME_KEY;
break;
case ui::VKEY_INSERT:
string_id = IDS_APP_INSERT_KEY;
break;
case ui::VKEY_DELETE:
string_id = IDS_APP_DELETE_KEY;
break;
case ui::VKEY_LEFT:
string_id = IDS_APP_LEFT_ARROW_KEY;
break;
case ui::VKEY_RIGHT:
string_id = IDS_APP_RIGHT_ARROW_KEY;
break;
case ui::VKEY_BACK:
string_id = IDS_APP_BACKSPACE_KEY;
break;
case ui::VKEY_F1:
string_id = IDS_APP_F1_KEY;
break;
case ui::VKEY_F11:
string_id = IDS_APP_F11_KEY;
break;
default:
break;
}
string16 shortcut;
if (!string_id) {
#if defined(OS_WIN)
// Our fallback is to try translate the key code to a regular character
// unless it is one of digits (VK_0 to VK_9). Some keyboard
// layouts have characters other than digits assigned in
// an unshifted mode (e.g. French AZERY layout has 'a with grave
// accent' for '0'). For display in the menu (e.g. Ctrl-0 for the
// default zoom level), we leave VK_[0-9] alone without translation.
wchar_t key;
if (key_code_ >= '0' && key_code_ <= '9')
key = key_code_;
else
key = LOWORD(::MapVirtualKeyW(key_code_, MAPVK_VK_TO_CHAR));
shortcut += key;
#elif defined(OS_LINUX)
const gchar* name = NULL;
switch (key_code_) {
case ui::VKEY_OEM_2:
name = static_cast<const gchar*>("/");
break;
default:
name = gdk_keyval_name(gdk_keyval_to_lower(key_code_));
break;
}
if (name) {
if (name[0] != 0 && name[1] == 0)
shortcut += static_cast<string16::value_type>(g_ascii_toupper(name[0]));
else
shortcut += UTF8ToUTF16(name);
}
#endif
} else {
shortcut = l10n_util::GetStringUTF16(string_id);
}
// Checking whether the character used for the accelerator is alphanumeric.
// If it is not, then we need to adjust the string later on if the locale is
// right-to-left. See below for more information of why such adjustment is
// required.
string16 shortcut_rtl;
bool adjust_shortcut_for_rtl = false;
if (base::i18n::IsRTL() && shortcut.length() == 1 &&
!IsAsciiAlpha(shortcut[0]) && !IsAsciiDigit(shortcut[0])) {
adjust_shortcut_for_rtl = true;
shortcut_rtl.assign(shortcut);
}
if (IsShiftDown())
shortcut = l10n_util::GetStringFUTF16(IDS_APP_SHIFT_MODIFIER, shortcut);
// Note that we use 'else-if' in order to avoid using Ctrl+Alt as a shortcut.
// See http://blogs.msdn.com/oldnewthing/archive/2004/03/29/101121.aspx for
// more information.
if (IsCtrlDown())
shortcut = l10n_util::GetStringFUTF16(IDS_APP_CONTROL_MODIFIER, shortcut);
else if (IsAltDown())
shortcut = l10n_util::GetStringFUTF16(IDS_APP_ALT_MODIFIER, shortcut);
// For some reason, menus in Windows ignore standard Unicode directionality
// marks (such as LRE, PDF, etc.). On RTL locales, we use RTL menus and
// therefore any text we draw for the menu items is drawn in an RTL context.
// Thus, the text "Ctrl++" (which we currently use for the Zoom In option)
// appears as "++Ctrl" in RTL because the Unicode BiDi algorithm puts
// punctuations on the left when the context is right-to-left. Shortcuts that
// do not end with a punctuation mark (such as "Ctrl+H" do not have this
// problem).
//
// The only way to solve this problem is to adjust the string if the locale
// is RTL so that it is drawn correnctly in an RTL context. Instead of
// returning "Ctrl++" in the above example, we return "++Ctrl". This will
// cause the text to appear as "Ctrl++" when Windows draws the string in an
// RTL context because the punctunation no longer appears at the end of the
// string.
//
// TODO(idana) bug# 1232732: this hack can be avoided if instead of using
// views::Menu we use views::MenuItemView because the latter is a View
// subclass and therefore it supports marking text as RTL or LTR using
// standard Unicode directionality marks.
if (adjust_shortcut_for_rtl) {
int key_length = static_cast<int>(shortcut_rtl.length());
DCHECK_GT(key_length, 0);
shortcut_rtl.append(ASCIIToUTF16("+"));
// Subtracting the size of the shortcut key and 1 for the '+' sign.
shortcut_rtl.append(shortcut, 0, shortcut.length() - key_length - 1);
shortcut.swap(shortcut_rtl);
}
return shortcut;
}
} // namespace views