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