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#include "QtGlobal"
#include "bidiextender.h"
#include "QDebug"
//mostly taken from biditexmaker
#if defined( Q_OS_LINUX ) || ( defined( Q_OS_UNIX ) && !defined( Q_OS_MAC ) )
#define WS_X11
#endif
#if defined( WS_X11 )
#include "xkb/XKeyboard.h"
#include "xkb/X11Exception.h"
#include <string>
#endif
#if defined( Q_OS_WIN )
#include "Windows.h"
#else
typedef int HKL;
#endif
static bool languagesInitialized = false;
static HKL languageIdRTL, languageIdLTR, oldInputLanguageId;
static InputLanguage oldInputLanguage = IL_UNCERTAIN;
HKL getCurrentLanguage()
{
#if defined( Q_OS_WIN )
return GetKeyboardLayout(0);
#elif defined( WS_X11 )
try {
kb::XKeyboard xkb;
return xkb.get_group() + 1;
} catch (X11Exception) {
return 0;
}
#else
return 0;
#endif
}
#if defined( Q_OS_WIN )
bool isProbablyLTRLanguageRaw(int id)
{
//checks primary language symbol, e.g. LANG_ENGLISH would be ltr
return id != LANG_PERSIAN && id != LANG_ARABIC && id != LANG_HEBREW && id != LANG_URDU;
}
#elif defined( WS_X11 )
bool isProbablyLTRLanguageRaw(const std::string &symb)
{
//e.g. "us" would be ltr
return symb != "ir" && symb != "ara" && symb != "il" && symb != "af" && symb != "pk";
}
#endif
bool isProbablyLTRLanguageCode(HKL id)
{
#if defined( Q_OS_WIN )
return isProbablyLTRLanguageRaw(((int) id) & 0x000000FF);
#elif defined( WS_X11 )
try {
kb::XKeyboard xkb;
kb::string_vector installedLangSymbols = kb::parse3(xkb.get_kb_string(), kb::nonsyms());
id --;
if (id >= 0 && id < (int) installedLangSymbols.size())
return isProbablyLTRLanguageRaw(installedLangSymbols[id]);
} catch (X11Exception) { }
return false;
#else
return false;
#endif
}
void initializeLanguages()
{
languageIdLTR = 0;
languageIdRTL = 0;
oldInputLanguageId = getCurrentLanguage();
if (isProbablyLTRLanguageCode(oldInputLanguageId)) {
oldInputLanguage = IL_LTR;
languageIdLTR = oldInputLanguageId;
} else {
oldInputLanguage = IL_RTL;
languageIdRTL = oldInputLanguageId;
}
#if defined( Q_OS_WIN )
const int MAXSIZE = 32;
HKL langs[MAXSIZE];
int count = GetKeyboardLayoutList(0, NULL);//this doesn't work on Win7 64Bit
if (count <= 0 || count > MAXSIZE)
count = GetKeyboardLayoutList(MAXSIZE, langs);//this seems be slow on some systems
else
GetKeyboardLayoutList(count, langs);
HKL bestLTR = 0;
for (int i = 0; i < count; ++i) {
int id = (int)langs[i] & 0x000000FF;
if (id == LANG_ENGLISH) bestLTR = langs[i];
if (isProbablyLTRLanguageRaw(id)) {
if (!bestLTR) bestLTR = langs[i];
} else if (!languageIdRTL) languageIdRTL = langs[i];
}
if (!languageIdLTR) languageIdLTR = bestLTR;
#endif //Q_OS_WIN
#if defined( WS_X11 )
try {
kb::XKeyboard xkb;
kb::string_vector installedLangSymbols = kb::parse3(xkb.get_kb_string(), kb::nonsyms());
int bestLTR = -1;
for (size_t i = 0; i < installedLangSymbols.size(); ++i) {
std::string symb = installedLangSymbols.at(i);
if (symb == "us") bestLTR = i;
if (isProbablyLTRLanguageRaw(symb)) {
if (bestLTR < 0) bestLTR = i;
} else if (!languageIdRTL) languageIdRTL = i + 1;
}
if (!languageIdLTR) languageIdLTR = bestLTR + 1;
} catch (X11Exception) {}
#endif // WS_X11
languagesInitialized = true;
}
void setInputLanguage(HKL code)
{
if (!code) return;
#if defined( Q_OS_WIN )
ActivateKeyboardLayout(code, KLF_SETFORPROCESS);
#endif
#if defined( WS_X11 )
try{
kb::XKeyboard xkb;
xkb.set_group(code - 1);
} catch (X11Exception) {}
#endif
}
void setInputLanguage(InputLanguage lang)
{
if (lang == oldInputLanguage) return;
if (!languagesInitialized)
initializeLanguages();
HKL curLayout = getCurrentLanguage();
HKL newLayout = 0;
if (curLayout != oldInputLanguageId) {
if (oldInputLanguage == IL_LTR) languageIdLTR = curLayout;
else if (oldInputLanguage == IL_RTL) languageIdRTL = curLayout;
else if (oldInputLanguage == IL_UNCERTAIN) {
if (lang == IL_LTR) languageIdLTR = curLayout;
else if (lang == IL_RTL) languageIdRTL = curLayout;
}
}
if (lang == IL_LTR) newLayout = languageIdLTR;
else if (lang == IL_RTL) newLayout = languageIdRTL;
if (newLayout && curLayout != newLayout) {
setInputLanguage(newLayout);
oldInputLanguageId = newLayout;
} else oldInputLanguageId = curLayout;
oldInputLanguage = lang;
}
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