mirror of
https://github.com/classilla/tenfourfox.git
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180 lines
5.5 KiB
C++
180 lines
5.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <stdio.h>
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#include "nsBidiKeyboard.h"
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#include "prmem.h"
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#include <tchar.h>
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NS_IMPL_ISUPPORTS(nsBidiKeyboard, nsIBidiKeyboard)
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nsBidiKeyboard::nsBidiKeyboard() : nsIBidiKeyboard()
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{
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Reset();
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}
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nsBidiKeyboard::~nsBidiKeyboard()
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{
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}
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NS_IMETHODIMP nsBidiKeyboard::Reset()
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{
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mInitialized = false;
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mHaveBidiKeyboards = false;
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mLTRKeyboard[0] = '\0';
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mRTLKeyboard[0] = '\0';
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mCurrentLocaleName[0] = '\0';
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return NS_OK;
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}
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NS_IMETHODIMP nsBidiKeyboard::IsLangRTL(bool *aIsRTL)
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{
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*aIsRTL = false;
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nsresult result = SetupBidiKeyboards();
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if (NS_FAILED(result))
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return result;
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HKL currentLocale;
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currentLocale = ::GetKeyboardLayout(0);
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*aIsRTL = IsRTLLanguage(currentLocale);
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if (!::GetKeyboardLayoutNameW(mCurrentLocaleName))
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return NS_ERROR_FAILURE;
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NS_ASSERTION(*mCurrentLocaleName,
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"GetKeyboardLayoutName return string length == 0");
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NS_ASSERTION((wcslen(mCurrentLocaleName) < KL_NAMELENGTH),
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"GetKeyboardLayoutName return string length >= KL_NAMELENGTH");
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// The language set by the user overrides the default language for that direction
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if (*aIsRTL) {
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wcsncpy(mRTLKeyboard, mCurrentLocaleName, KL_NAMELENGTH);
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mRTLKeyboard[KL_NAMELENGTH-1] = '\0'; // null terminate
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} else {
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wcsncpy(mLTRKeyboard, mCurrentLocaleName, KL_NAMELENGTH);
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mLTRKeyboard[KL_NAMELENGTH-1] = '\0'; // null terminate
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}
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NS_ASSERTION((wcslen(mRTLKeyboard) < KL_NAMELENGTH),
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"mLTRKeyboard has string length >= KL_NAMELENGTH");
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NS_ASSERTION((wcslen(mLTRKeyboard) < KL_NAMELENGTH),
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"mRTLKeyboard has string length >= KL_NAMELENGTH");
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return NS_OK;
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}
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NS_IMETHODIMP nsBidiKeyboard::GetHaveBidiKeyboards(bool* aResult)
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{
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NS_ENSURE_ARG_POINTER(aResult);
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nsresult result = SetupBidiKeyboards();
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if (NS_FAILED(result))
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return result;
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*aResult = mHaveBidiKeyboards;
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return NS_OK;
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}
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// Get the list of keyboard layouts available in the system
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// Set mLTRKeyboard to the first LTR keyboard in the list and mRTLKeyboard to the first RTL keyboard in the list
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// These defaults will be used unless the user explicitly sets something else.
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nsresult nsBidiKeyboard::SetupBidiKeyboards()
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{
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if (mInitialized)
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return mHaveBidiKeyboards ? NS_OK : NS_ERROR_FAILURE;
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int keyboards;
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HKL far* buf;
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HKL locale;
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wchar_t localeName[KL_NAMELENGTH];
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bool isLTRKeyboardSet = false;
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bool isRTLKeyboardSet = false;
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// GetKeyboardLayoutList with 0 as first parameter returns the number of keyboard layouts available
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keyboards = ::GetKeyboardLayoutList(0, nullptr);
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if (!keyboards)
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return NS_ERROR_FAILURE;
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// allocate a buffer to hold the list
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buf = (HKL far*) PR_Malloc(keyboards * sizeof(HKL));
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if (!buf)
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return NS_ERROR_OUT_OF_MEMORY;
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// Call again to fill the buffer
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if (::GetKeyboardLayoutList(keyboards, buf) != keyboards) {
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PR_Free(buf);
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return NS_ERROR_UNEXPECTED;
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}
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// Go through the list and pick a default LTR and RTL keyboard layout
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while (keyboards--) {
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locale = buf[keyboards];
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if (IsRTLLanguage(locale)) {
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_snwprintf(mRTLKeyboard, KL_NAMELENGTH, L"%.*x", KL_NAMELENGTH - 1,
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LANGIDFROMLCID((DWORD_PTR)locale));
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isRTLKeyboardSet = true;
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}
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else {
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_snwprintf(mLTRKeyboard, KL_NAMELENGTH, L"%.*x", KL_NAMELENGTH - 1,
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LANGIDFROMLCID((DWORD_PTR)locale));
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isLTRKeyboardSet = true;
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}
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}
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PR_Free(buf);
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mInitialized = true;
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// If there is not at least one keyboard of each directionality, Bidi
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// keyboard functionality will be disabled.
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mHaveBidiKeyboards = (isRTLKeyboardSet && isLTRKeyboardSet);
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if (!mHaveBidiKeyboards)
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return NS_ERROR_FAILURE;
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// Get the current keyboard layout and use it for either mRTLKeyboard or
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// mLTRKeyboard as appropriate. If the user has many keyboard layouts
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// installed this prevents us from arbitrarily resetting the current
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// layout (bug 80274)
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locale = ::GetKeyboardLayout(0);
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if (!::GetKeyboardLayoutNameW(localeName))
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return NS_ERROR_FAILURE;
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NS_ASSERTION(*localeName,
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"GetKeyboardLayoutName return string length == 0");
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NS_ASSERTION((wcslen(localeName) < KL_NAMELENGTH),
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"GetKeyboardLayout return string length >= KL_NAMELENGTH");
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if (IsRTLLanguage(locale)) {
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wcsncpy(mRTLKeyboard, localeName, KL_NAMELENGTH);
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mRTLKeyboard[KL_NAMELENGTH-1] = '\0'; // null terminate
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}
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else {
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wcsncpy(mLTRKeyboard, localeName, KL_NAMELENGTH);
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mLTRKeyboard[KL_NAMELENGTH-1] = '\0'; // null terminate
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}
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NS_ASSERTION(*mRTLKeyboard,
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"mLTRKeyboard has string length == 0");
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NS_ASSERTION(*mLTRKeyboard,
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"mLTRKeyboard has string length == 0");
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return NS_OK;
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}
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// Test whether the language represented by this locale identifier is a
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// right-to-left language, using bit 123 of the Unicode subset bitfield in
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// the LOCALESIGNATURE
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// See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/intl/unicode_63ub.asp
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bool nsBidiKeyboard::IsRTLLanguage(HKL aLocale)
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{
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LOCALESIGNATURE localesig;
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return (::GetLocaleInfoW(PRIMARYLANGID((DWORD_PTR)aLocale),
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LOCALE_FONTSIGNATURE,
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(LPWSTR)&localesig,
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(sizeof(localesig)/sizeof(WCHAR))) &&
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(localesig.lsUsb[3] & 0x08000000));
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}
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