From a1f1e1d1e581f69ea28914578c592f6e5cacc998 Mon Sep 17 00:00:00 2001
From: "smontagu%smontagu.org"
 <smontagu%smontagu.org@18797224-902f-48f8-a5cc-f745e15eee43>
Date: Sun, 28 Nov 2004 18:36:23 +0000
Subject: [PATCH] Mac implementation of nsIBidiKeyboard. Bug 266551, patch by
 Asaf Romano  <mozilla.mano@sent.com>, r=jhpedemonte, sr=bzbarsky

git-svn-id: svn://10.0.0.236/trunk@165854 18797224-902f-48f8-a5cc-f745e15eee43
---
 mozilla/widget/src/mac/nsBidiKeyboard.cpp | 50 ++++++++++++++++++++++-
 mozilla/widget/src/mac/nsBidiKeyboard.h   | 10 ++++-
 2 files changed, 57 insertions(+), 3 deletions(-)

diff --git a/mozilla/widget/src/mac/nsBidiKeyboard.cpp b/mozilla/widget/src/mac/nsBidiKeyboard.cpp
index 8a3e478dcd1..8306a5e5317 100644
--- a/mozilla/widget/src/mac/nsBidiKeyboard.cpp
+++ b/mozilla/widget/src/mac/nsBidiKeyboard.cpp
@@ -22,6 +22,7 @@
  *
  * Contributor(s):
  *   Simon Montagu
+ *   Asaf Romano <mozilla.mano@sent.com>
  *
  * Alternatively, the contents of this file may be used under the terms of
  * either the GNU General Public License Version 2 or later (the "GPL"), or
@@ -52,8 +53,44 @@ nsBidiKeyboard::~nsBidiKeyboard()
 NS_IMETHODIMP nsBidiKeyboard::IsLangRTL(PRBool *aIsRTL)
 {
   *aIsRTL = PR_FALSE;
-  // XXX Insert platform specific code to determine keyboard direction
-  return NS_OK;
+  nsresult rv = NS_ERROR_FAILURE;
+
+  // KLGetCurrentKeyboardLayout and KLGetKeyboardLayoutProperty are only available on OS 10.2 and later.
+  static PRBool checked = PR_FALSE;
+  static fpKLGetCurrentKeyboardLayout_type fpKLGetCurrentKeyboardLayout = NULL;
+  static fpKLGetKeyboardLayoutProperty_type fpKLGetKeyboardLayoutProperty = NULL;
+
+  if (!checked) {
+    CFBundleRef bundle =
        ::CFBundleGetBundleWithIdentifier(CFSTR("com.apple.Carbon"));
+    if (bundle) {
+      fpKLGetCurrentKeyboardLayout =
+          ::CFBundleGetFunctionPointerForName(bundle, CFSTR("KLGetCurrentKeyboardLayout"));
+      fpKLGetKeyboardLayoutProperty =
+          ::CFBundleGetFunctionPointerForName(bundle, CFSTR("KLGetKeyboardLayoutProperty"));
+    }
+    
+    checked = PR_TRUE;
+  }
+  
+  if (fpKLGetCurrentKeyboardLayout) {
+    OSStatus err;
+    KeyboardLayoutRef currentKeyboard;
+    const void* currentKeyboardResID;
+  
+    err = fpKLGetCurrentKeyboardLayout(&currentKeyboard);
+    if (err == noErr)
+    {
+      err = fpKLGetKeyboardLayoutProperty(currentKeyboard, 
+          kKLIdentifier, &currentKeyboardResID);
+      if (err == noErr)
+      {
+        rv = NS_OK;
+        *aIsRTL = IsRTLLanguage((SInt32)currentKeyboardResID);
+      }
+    }  
+  }
+
+  return rv;
 }
 
 NS_IMETHODIMP nsBidiKeyboard::SetLangFromBidiLevel(PRUint8 aLevel)
@@ -61,3 +98,12 @@ NS_IMETHODIMP nsBidiKeyboard::SetLangFromBidiLevel(PRUint8 aLevel)
   // XXX Insert platform specific code to set keyboard language
   return NS_OK;
 }
+
+PRBool nsBidiKeyboard::IsRTLLanguage(SInt32 aKeyboardResID)
+{
+  // 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
+  return (aKeyboardResID >= -18943 && aKeyboardResID <= -17920);
+}
diff --git a/mozilla/widget/src/mac/nsBidiKeyboard.h b/mozilla/widget/src/mac/nsBidiKeyboard.h
index 3011affdd16..970109118a3 100644
--- a/mozilla/widget/src/mac/nsBidiKeyboard.h
+++ b/mozilla/widget/src/mac/nsBidiKeyboard.h
@@ -22,6 +22,7 @@
  *
  * Contributor(s):
  *   Simon Montagu
+ *   Asaf Romano <mozilla.mano@sent.com>
  *
  * Alternatively, the contents of this file may be used under the terms of
  * either the GNU General Public License Version 2 or later (the "GPL"), or
@@ -40,6 +41,11 @@
 #ifndef __nsBidiKeyboard
 #define __nsBidiKeyboard
 #include "nsIBidiKeyboard.h"
+#include <Carbon/Carbon.h>
+
+typedef OSStatus (*fpKLGetCurrentKeyboardLayout_type) (KeyboardLayoutRef*);
+typedef OSStatus (*fpKLGetKeyboardLayoutProperty_type) 
+    (KeyboardLayoutRef, KeyboardLayoutPropertyTag, void**);
 
 class nsBidiKeyboard : public nsIBidiKeyboard
 {
@@ -49,7 +55,9 @@ public:
 
   nsBidiKeyboard();
   virtual ~nsBidiKeyboard();
-  /* additional members */
+
+protected:
+  PRBool IsRTLLanguage(SInt32 aKeyboardResID);
 };