move osx only code

PanoPainter-OSX/main.cpp

@@ -12,6 +12,7 @@
 #include <Cocoa/Cocoa.h>
 #include <CoreVideo/CoreVideo.h>
 #include <OpenGL/OpenGL.h>
+#import <Carbon/Carbon.h>
 #import "objc_utils.h"
 
 #include <deque>
@@ -21,6 +22,46 @@
 @import AppCenterAnalytics;
 @import AppCenterCrashes;
 
+NSString* keyCodeToString(NSUInteger keyCode, NSUInteger mods)
+{
+  TISInputSourceRef currentKeyboard = TISCopyCurrentKeyboardInputSource();
+  CFDataRef uchr =
+    (CFDataRef)TISGetInputSourceProperty(currentKeyboard,
+                                         kTISPropertyUnicodeKeyLayoutData);
+  const UCKeyboardLayout *keyboardLayout =
+    (const UCKeyboardLayout*)CFDataGetBytePtr(uchr);
+
+  if(keyboardLayout)
+  {
+    UInt32 deadKeyState = 0;
+    UniCharCount maxStringLength = 255;
+    UniCharCount actualStringLength = 0;
+    UniChar unicodeString[maxStringLength];
+
+    OSStatus status = UCKeyTranslate(keyboardLayout,
+                                     keyCode, kUCKeyActionDown, mods,
+                                     LMGetKbdType(), 0,
+                                     &deadKeyState,
+                                     maxStringLength,
+                                     &actualStringLength, unicodeString);
+
+    if (actualStringLength == 0 && deadKeyState)
+    {
+      status = UCKeyTranslate(keyboardLayout,
+                                       kVK_Space, kUCKeyActionDown, mods,
+                                       LMGetKbdType(), 0,
+                                       &deadKeyState,
+                                       maxStringLength,
+                                       &actualStringLength, unicodeString);
+    }
+    if(actualStringLength > 0 && status == noErr)
+      return [[NSString stringWithCharacters:unicodeString
+                        length:(NSUInteger)actualStringLength] lowercaseString];
+  }
+
+  return nil;
+}
+
 @implementation View
 {
     NSSharingService *airdrop_service;