1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/widget/windows/nsBidiKeyboard.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,179 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
1.5 + *
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#include <stdio.h>
1.11 +#include "nsBidiKeyboard.h"
1.12 +#include "prmem.h"
1.13 +#include <tchar.h>
1.14 +
1.15 +NS_IMPL_ISUPPORTS(nsBidiKeyboard, nsIBidiKeyboard)
1.16 +
1.17 +nsBidiKeyboard::nsBidiKeyboard() : nsIBidiKeyboard()
1.18 +{
1.19 + Reset();
1.20 +}
1.21 +
1.22 +nsBidiKeyboard::~nsBidiKeyboard()
1.23 +{
1.24 +}
1.25 +
1.26 +NS_IMETHODIMP nsBidiKeyboard::Reset()
1.27 +{
1.28 + mInitialized = false;
1.29 + mHaveBidiKeyboards = false;
1.30 + mLTRKeyboard[0] = '\0';
1.31 + mRTLKeyboard[0] = '\0';
1.32 + mCurrentLocaleName[0] = '\0';
1.33 + return NS_OK;
1.34 +}
1.35 +
1.36 +NS_IMETHODIMP nsBidiKeyboard::IsLangRTL(bool *aIsRTL)
1.37 +{
1.38 + *aIsRTL = false;
1.39 +
1.40 + nsresult result = SetupBidiKeyboards();
1.41 + if (NS_FAILED(result))
1.42 + return result;
1.43 +
1.44 + HKL currentLocale;
1.45 +
1.46 + currentLocale = ::GetKeyboardLayout(0);
1.47 + *aIsRTL = IsRTLLanguage(currentLocale);
1.48 +
1.49 + if (!::GetKeyboardLayoutNameW(mCurrentLocaleName))
1.50 + return NS_ERROR_FAILURE;
1.51 +
1.52 + NS_ASSERTION(*mCurrentLocaleName,
1.53 + "GetKeyboardLayoutName return string length == 0");
1.54 + NS_ASSERTION((wcslen(mCurrentLocaleName) < KL_NAMELENGTH),
1.55 + "GetKeyboardLayoutName return string length >= KL_NAMELENGTH");
1.56 +
1.57 + // The language set by the user overrides the default language for that direction
1.58 + if (*aIsRTL) {
1.59 + wcsncpy(mRTLKeyboard, mCurrentLocaleName, KL_NAMELENGTH);
1.60 + mRTLKeyboard[KL_NAMELENGTH-1] = '\0'; // null terminate
1.61 + } else {
1.62 + wcsncpy(mLTRKeyboard, mCurrentLocaleName, KL_NAMELENGTH);
1.63 + mLTRKeyboard[KL_NAMELENGTH-1] = '\0'; // null terminate
1.64 + }
1.65 +
1.66 + NS_ASSERTION((wcslen(mRTLKeyboard) < KL_NAMELENGTH),
1.67 + "mLTRKeyboard has string length >= KL_NAMELENGTH");
1.68 + NS_ASSERTION((wcslen(mLTRKeyboard) < KL_NAMELENGTH),
1.69 + "mRTLKeyboard has string length >= KL_NAMELENGTH");
1.70 + return NS_OK;
1.71 +}
1.72 +
1.73 +NS_IMETHODIMP nsBidiKeyboard::GetHaveBidiKeyboards(bool* aResult)
1.74 +{
1.75 + NS_ENSURE_ARG_POINTER(aResult);
1.76 +
1.77 + nsresult result = SetupBidiKeyboards();
1.78 + if (NS_FAILED(result))
1.79 + return result;
1.80 +
1.81 + *aResult = mHaveBidiKeyboards;
1.82 + return NS_OK;
1.83 +}
1.84 +
1.85 +
1.86 +// Get the list of keyboard layouts available in the system
1.87 +// Set mLTRKeyboard to the first LTR keyboard in the list and mRTLKeyboard to the first RTL keyboard in the list
1.88 +// These defaults will be used unless the user explicitly sets something else.
1.89 +nsresult nsBidiKeyboard::SetupBidiKeyboards()
1.90 +{
1.91 + if (mInitialized)
1.92 + return mHaveBidiKeyboards ? NS_OK : NS_ERROR_FAILURE;
1.93 +
1.94 + int keyboards;
1.95 + HKL far* buf;
1.96 + HKL locale;
1.97 + wchar_t localeName[KL_NAMELENGTH];
1.98 + bool isLTRKeyboardSet = false;
1.99 + bool isRTLKeyboardSet = false;
1.100 +
1.101 + // GetKeyboardLayoutList with 0 as first parameter returns the number of keyboard layouts available
1.102 + keyboards = ::GetKeyboardLayoutList(0, nullptr);
1.103 + if (!keyboards)
1.104 + return NS_ERROR_FAILURE;
1.105 +
1.106 + // allocate a buffer to hold the list
1.107 + buf = (HKL far*) PR_Malloc(keyboards * sizeof(HKL));
1.108 + if (!buf)
1.109 + return NS_ERROR_OUT_OF_MEMORY;
1.110 +
1.111 + // Call again to fill the buffer
1.112 + if (::GetKeyboardLayoutList(keyboards, buf) != keyboards) {
1.113 + PR_Free(buf);
1.114 + return NS_ERROR_UNEXPECTED;
1.115 + }
1.116 +
1.117 + // Go through the list and pick a default LTR and RTL keyboard layout
1.118 + while (keyboards--) {
1.119 + locale = buf[keyboards];
1.120 + if (IsRTLLanguage(locale)) {
1.121 + _snwprintf(mRTLKeyboard, KL_NAMELENGTH, L"%.*x", KL_NAMELENGTH - 1,
1.122 + LANGIDFROMLCID((DWORD_PTR)locale));
1.123 + isRTLKeyboardSet = true;
1.124 + }
1.125 + else {
1.126 + _snwprintf(mLTRKeyboard, KL_NAMELENGTH, L"%.*x", KL_NAMELENGTH - 1,
1.127 + LANGIDFROMLCID((DWORD_PTR)locale));
1.128 + isLTRKeyboardSet = true;
1.129 + }
1.130 + }
1.131 + PR_Free(buf);
1.132 + mInitialized = true;
1.133 +
1.134 + // If there is not at least one keyboard of each directionality, Bidi
1.135 + // keyboard functionality will be disabled.
1.136 + mHaveBidiKeyboards = (isRTLKeyboardSet && isLTRKeyboardSet);
1.137 + if (!mHaveBidiKeyboards)
1.138 + return NS_ERROR_FAILURE;
1.139 +
1.140 + // Get the current keyboard layout and use it for either mRTLKeyboard or
1.141 + // mLTRKeyboard as appropriate. If the user has many keyboard layouts
1.142 + // installed this prevents us from arbitrarily resetting the current
1.143 + // layout (bug 80274)
1.144 + locale = ::GetKeyboardLayout(0);
1.145 + if (!::GetKeyboardLayoutNameW(localeName))
1.146 + return NS_ERROR_FAILURE;
1.147 +
1.148 + NS_ASSERTION(*localeName,
1.149 + "GetKeyboardLayoutName return string length == 0");
1.150 + NS_ASSERTION((wcslen(localeName) < KL_NAMELENGTH),
1.151 + "GetKeyboardLayout return string length >= KL_NAMELENGTH");
1.152 +
1.153 + if (IsRTLLanguage(locale)) {
1.154 + wcsncpy(mRTLKeyboard, localeName, KL_NAMELENGTH);
1.155 + mRTLKeyboard[KL_NAMELENGTH-1] = '\0'; // null terminate
1.156 + }
1.157 + else {
1.158 + wcsncpy(mLTRKeyboard, localeName, KL_NAMELENGTH);
1.159 + mLTRKeyboard[KL_NAMELENGTH-1] = '\0'; // null terminate
1.160 + }
1.161 +
1.162 + NS_ASSERTION(*mRTLKeyboard,
1.163 + "mLTRKeyboard has string length == 0");
1.164 + NS_ASSERTION(*mLTRKeyboard,
1.165 + "mLTRKeyboard has string length == 0");
1.166 +
1.167 + return NS_OK;
1.168 +}
1.169 +
1.170 +// Test whether the language represented by this locale identifier is a
1.171 +// right-to-left language, using bit 123 of the Unicode subset bitfield in
1.172 +// the LOCALESIGNATURE
1.173 +// See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/intl/unicode_63ub.asp
1.174 +bool nsBidiKeyboard::IsRTLLanguage(HKL aLocale)
1.175 +{
1.176 + LOCALESIGNATURE localesig;
1.177 + return (::GetLocaleInfoW(PRIMARYLANGID((DWORD_PTR)aLocale),
1.178 + LOCALE_FONTSIGNATURE,
1.179 + (LPWSTR)&localesig,
1.180 + (sizeof(localesig)/sizeof(WCHAR))) &&
1.181 + (localesig.lsUsb[3] & 0x08000000));
1.182 +}
