Bug 348724: nsBidiKeyboard for GTK2 backend, patch by Behnam ZWNJ Esfahbod <bugs+behnam@zwnj.org>, r=smontagu, sr=roc, a=beltzner

widget/src/gtk2/nsBidiKeyboard.cpp

@@ -21,6 +21,7 @@
  * are Copyright (C) 2001 the Initial Developer. All Rights Reserved.
  *
  * Contributor(s):
+ *   Behnam Esfahbod <behnam@zwnj.org>
  *
  * 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
@@ -36,27 +37,69 @@
  *
  * ***** END LICENSE BLOCK ***** */
 
+#include "prlink.h"
+
 #include "nsBidiKeyboard.h"
+#include <gtk/gtk.h>
+
+
+static PRLibrary *gtklib = nsnull;
+
+typedef gboolean (PR_CALLBACK *GdkKeymapHaveBidiLayoutsType)(GdkKeymap *keymap);
+static GdkKeymapHaveBidiLayoutsType GdkKeymapHaveBidiLayouts = nsnull;
+
 
 NS_IMPL_ISUPPORTS1(nsBidiKeyboard, nsIBidiKeyboard)
 
-nsBidiKeyboard::nsBidiKeyboard() : nsIBidiKeyboard()
+nsBidiKeyboard::nsBidiKeyboard()
 {
+    if (!gtklib)
+        gtklib = PR_LoadLibrary("libgtk-x11-2.0.so.0");
+
+    if (gtklib && !GdkKeymapHaveBidiLayouts)
+            GdkKeymapHaveBidiLayouts = (GdkKeymapHaveBidiLayoutsType) PR_FindFunctionSymbol(gtklib, "gdk_keymap_have_bidi_layouts");
+
+    SetHaveBidiKeyboards();
 }
 
 nsBidiKeyboard::~nsBidiKeyboard()
 {
+    if (gtklib) {
+        PR_UnloadLibrary(gtklib);
+        gtklib = nsnull;
+
+        GdkKeymapHaveBidiLayouts = nsnull;
+    }
 }
 
-NS_IMETHODIMP nsBidiKeyboard::IsLangRTL(PRBool *aIsRTL)
+NS_IMETHODIMP
+nsBidiKeyboard::IsLangRTL(PRBool *aIsRTL)
 {
-    *aIsRTL = PR_FALSE;
+    if (!mHaveBidiKeyboards)
-    // XXX Insert platform specific code to determine keyboard direction
+        return NS_ERROR_FAILURE;
-    return NS_ERROR_NOT_IMPLEMENTED;
+
+    *aIsRTL = (gdk_keymap_get_direction(NULL) == PANGO_DIRECTION_RTL);
+
+    return NS_OK;
 }
 
-NS_IMETHODIMP nsBidiKeyboard::SetLangFromBidiLevel(PRUint8 aLevel)
+nsresult
+nsBidiKeyboard::SetHaveBidiKeyboards()
+{
+    mHaveBidiKeyboards = PR_FALSE;
+
+    if (!gtklib || !GdkKeymapHaveBidiLayouts)
+        return NS_ERROR_FAILURE;
+
+    mHaveBidiKeyboards = (*GdkKeymapHaveBidiLayouts)(NULL);
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsBidiKeyboard::SetLangFromBidiLevel(PRUint8 aLevel)
 {
     // XXX Insert platform specific code to set keyboard language
     return NS_ERROR_NOT_IMPLEMENTED;
 }
+

widget/src/gtk2/nsBidiKeyboard.h

@@ -21,6 +21,7 @@
  * are Copyright (C) 2001 the Initial Developer. All Rights Reserved.
  *
  * Contributor(s):
+ *   Behnam Esfahbod <behnam@zwnj.org>
  *
  * 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
@@ -47,8 +48,12 @@ public:
     NS_DECL_NSIBIDIKEYBOARD
 
     nsBidiKeyboard();
+
+protected:
     virtual ~nsBidiKeyboard();
+
+    PRPackedBool mHaveBidiKeyboards;
+    nsresult SetHaveBidiKeyboards();
 };
 
-
 #endif // __nsBidiKeyboard