gecko/widget/src/cocoa/nsBidiKeyboard.mm

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 *   Simon Montagu
 *   Asaf Romano <mozilla.mano@sent.com>
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#include "nsBidiKeyboard.h"
#include "nsObjCExceptions.h"

#import <Carbon/Carbon.h>

NS_IMPL_ISUPPORTS1(nsBidiKeyboard, nsIBidiKeyboard)

nsBidiKeyboard::nsBidiKeyboard() : nsIBidiKeyboard()
{
}

nsBidiKeyboard::~nsBidiKeyboard()
{
}

NS_IMETHODIMP nsBidiKeyboard::IsLangRTL(PRBool *aIsRTL)
{
  NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;

#ifdef __LP64__
  // There isn't a way to determine this in 64-bit Mac OS X because any keyboard
  // layout could generate any unicode characters. Apple simply doesn't consider
  // this to be a valid question.
  return NS_ERROR_FAILURE;
#else  
  *aIsRTL = PR_FALSE;
  nsresult rv = NS_ERROR_FAILURE;

  OSStatus err;
  KeyboardLayoutRef currentKeyboard;

  err = ::KLGetCurrentKeyboardLayout(&currentKeyboard);
  if (err == noErr) {
    const void* currentKeyboardResID;
    err = ::KLGetKeyboardLayoutProperty(currentKeyboard, kKLIdentifier,
                                        &currentKeyboardResID);
    if (err == noErr) {
      // Check if the resource id is BiDi associated (Arabic, Persian, Hebrew)
      // (Persian is included in the Arabic range)
      // http://developer.apple.com/documentation/mac/Text/Text-534.html#HEADING534-0
      // Note: these ^^ values are negative on Mac OS X
      *aIsRTL = ((SInt32)currentKeyboardResID >= -18943 &&
                 (SInt32)currentKeyboardResID <= -17920);
      rv = NS_OK;
    }
  }

  return rv;
#endif

  NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
}

NS_IMETHODIMP nsBidiKeyboard::SetLangFromBidiLevel(PRUint8 aLevel)
{
  // XXX Insert platform specific code to set keyboard language
  return NS_OK;
}