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diff --git a/indra/newview/llappdelegate-objc.mm b/indra/newview/llappdelegate-objc.mm
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+++ b/indra/newview/llappdelegate-objc.mm
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+/**
+ * @file llappdelegate-objc.mm
+ * @brief Class implementation for the Mac version's application delegate.
+ *
+ * $LicenseInfo:firstyear=2000&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#import "llappdelegate-objc.h"
+#include "llwindowmacosx-objc.h"
+#include <Carbon/Carbon.h> // Used for Text Input Services ("Safe" API - it's supported)
+
+@implementation LLAppDelegate
+
+@synthesize window;
+@synthesize inputWindow;
+@synthesize inputView;
+@synthesize currentInputLanguage;
+
+- (void)dealloc
+{
+    [super dealloc];
+}
+
+- (void) applicationDidFinishLaunching:(NSNotification *)notification
+{
+	frameTimer = nil;
+	
+	[self languageUpdated];
+	
+	if (initViewer())
+	{
+		frameTimer = [NSTimer scheduledTimerWithTimeInterval:0.0 target:self selector:@selector(mainLoop) userInfo:nil repeats:YES];
+	} else {
+		handleQuit();
+	}
+	
+	[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(languageUpdated) name:@"NSTextInputContextKeyboardSelectionDidChangeNotification" object:nil];
+}
+
+- (void) applicationDidBecomeActive:(NSNotification *)notification
+{
+	callWindowFocus();
+}
+
+- (void) applicationDidResignActive:(NSNotification *)notification
+{
+	callWindowUnfocus();
+}
+
+- (NSApplicationDelegateReply) applicationShouldTerminate:(NSApplication *)sender
+{
+	if (!runMainLoop())
+	{
+		handleQuit();
+		return NSTerminateCancel;
+	} else {
+		[frameTimer release];
+		cleanupViewer();
+		return NSTerminateNow;
+	}
+}
+
+- (void) mainLoop
+{
+	bool appExiting = runMainLoop();
+	if (appExiting)
+	{
+		[frameTimer release];
+		[[NSApplication sharedApplication] terminate:self];
+	}
+}
+
+- (void) showInputWindow:(bool)show withEvent:(NSEvent*)textEvent
+{
+	if (![self romanScript])
+	{
+		if (show)
+		{
+			NSLog(@"Showing input window.");
+			[inputWindow makeKeyAndOrderFront:inputWindow];
+            if (textEvent != nil)
+            {
+                [[inputView inputContext] discardMarkedText];
+                [[inputView inputContext] handleEvent:textEvent];
+            }
+		} else {
+			NSLog(@"Hiding input window.");
+			[inputWindow orderOut:inputWindow];
+			[window makeKeyAndOrderFront:window];
+		}
+	}
+}
+
+// This will get called multiple times by NSNotificationCenter.
+// It will be called every time that the window focus changes, and every time that the input language gets changed.
+// The primary use case for this selector is to update our current input language when the user, for whatever reason, changes the input language.
+// This is the more elegant way of handling input language changes instead of checking every time we want to use the input window.
+
+- (void) languageUpdated
+{
+	TISInputSourceRef currentInput = TISCopyCurrentKeyboardInputSource();
+	CFArrayRef languages = (CFArrayRef)TISGetInputSourceProperty(currentInput, kTISPropertyInputSourceLanguages);
+	
+#if 0 // In the event of ever needing to add new language sources, change this to 1 and watch the terminal for "languages:"
+	NSLog(@"languages: %@", TISGetInputSourceProperty(currentInput, kTISPropertyInputSourceLanguages));
+#endif
+	
+	// Typically the language we want is going to be the very first result in the array.
+	currentInputLanguage = (NSString*)CFArrayGetValueAtIndex(languages, 0);
+}
+
+- (bool) romanScript
+{
+	// How to add support for new languages with the input window:
+	// Simply append this array with the language code (ja for japanese, ko for korean, zh for chinese, etc.)
+	NSArray *nonRomanScript = [[NSArray alloc] initWithObjects:@"ja", @"ko", @"zh-Hant", @"zh-Hans", nil];
+	if ([nonRomanScript containsObject:currentInputLanguage])
+    {
+        return false;
+    }
+    
+    return true;
+}
+
+@end