Add char_to_key_code.m

This file includes functions for getting a `CGKeyCode` from a character
reference.

Copied from Stack Overflow by Théo Winterhalter.

2 files changed, 81 insertions, 0 deletions

diff --git a/DomeKey.xcodeproj/project.pbxproj b/DomeKey.xcodeproj/project.pbxproj
index da85841..fb73c83 100644
--- a/DomeKey.xcodeproj/project.pbxproj
+++ b/DomeKey.xcodeproj/project.pbxproj
@@ -12,6 +12,7 @@
 		D11184622125206E00961687 /* AppDelegate.m in Sources */ = {isa = PBXBuildFile; fileRef = D11184612125206E00961687 /* AppDelegate.m */; };
 		D160C2A12118EF9D007D1B50 /* main.m in Sources */ = {isa = PBXBuildFile; fileRef = D160C2A02118EF9D007D1B50 /* main.m */; };
 		D1E101FE2133FA0300B2CA29 /* KeyboardSimulator.m in Sources */ = {isa = PBXBuildFile; fileRef = D1E101FD2133FA0300B2CA29 /* KeyboardSimulator.m */; };
+		D1E1020821345E2300B2CA29 /* char_to_key_code.m in Sources */ = {isa = PBXBuildFile; fileRef = D1E1020721345E2200B2CA29 /* char_to_key_code.m */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -74,6 +75,7 @@
 		D160C31521197983007D1B50 /* DDHidLib.xcodeproj */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.pb-project"; name = DDHidLib.xcodeproj; path = lib/DDHidLib/DDHidLib.xcodeproj; sourceTree = "<group>"; };
 		D1E101FC2133FA0300B2CA29 /* KeyboardSimulator.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = KeyboardSimulator.h; sourceTree = "<group>"; };
 		D1E101FD2133FA0300B2CA29 /* KeyboardSimulator.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = KeyboardSimulator.m; sourceTree = "<group>"; };
+		D1E1020721345E2200B2CA29 /* char_to_key_code.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = char_to_key_code.m; path = lib/char_to_key_code.m; sourceTree = SOURCE_ROOT; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -92,6 +94,7 @@
 			isa = PBXGroup;
 			children = (
 				D160C29F2118EF9D007D1B50 /* DomeKey */,
+				D1E1020621345DF100B2CA29 /* lib */,
 				D160C31421197982007D1B50 /* Frameworks */,
 				D160C29E2118EF9D007D1B50 /* Products */,
 			);
@@ -138,6 +141,15 @@
 			name = Products;
 			sourceTree = "<group>";
 		};
+		D1E1020621345DF100B2CA29 /* lib */ = {
+			isa = PBXGroup;
+			children = (
+				D1E1020721345E2200B2CA29 /* char_to_key_code.m */,
+			);
+			name = lib;
+			path = DomeKey/lib;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
@@ -235,6 +247,7 @@
 			files = (
 				D110C9482122E2D80094F963 /* HeadphoneKey.m in Sources */,
 				D160C2A12118EF9D007D1B50 /* main.m in Sources */,
+				D1E1020821345E2300B2CA29 /* char_to_key_code.m in Sources */,
 				D11184622125206E00961687 /* AppDelegate.m in Sources */,
 				D1E101FE2133FA0300B2CA29 /* KeyboardSimulator.m in Sources */,
 			);
diff --git a/lib/char_to_key_code.m b/lib/char_to_key_code.m
new file mode 100644
index 0000000..b4fcdec
--- /dev/null
+++ b/lib/char_to_key_code.m
@@ -0,0 +1,68 @@
+// Théo Winterhalter
+// https://stackoverflow.com/users/1275975/th%c3%a9o-winterhalter
+// https://stackoverflow.com/questions/1918841/how-to-convert-ascii-character-to-cgkeycode/33584460#33584460
+
+NSString* keyCodeToString(CGKeyCode keyCode)
+{
+  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, 0,
+                                     LMGetKbdType(), 0,
+                                     &deadKeyState,
+                                     maxStringLength,
+                                     &actualStringLength, unicodeString);
+
+    if (actualStringLength == 0 && deadKeyState)
+    {
+      status = UCKeyTranslate(keyboardLayout,
+                                       kVK_Space, kUCKeyActionDown, 0,
+                                       LMGetKbdType(), 0,
+                                       &deadKeyState,
+                                       maxStringLength,
+                                       &actualStringLength, unicodeString);
+    }
+    if(actualStringLength > 0 && status == noErr)
+      return [[NSString stringWithCharacters:unicodeString
+                        length:(NSUInteger)actualStringLength] lowercaseString];
+  }
+
+  return nil;
+}
+
+NSNumber* charToKeyCode(const char c)
+{
+  static NSMutableDictionary* dict = nil;
+
+  if (dict == nil)
+  {
+    dict = [NSMutableDictionary dictionary];
+
+    // For every keyCode
+    size_t i;
+    for (i = 0; i < 128; ++i)
+    {
+      NSString* str = keyCodeToString((CGKeyCode)i);
+      if(str != nil && ![str isEqualToString:@""])
+      {
+        [dict setObject:[NSNumber numberWithInt:i] forKey:str];
+      }
+    }
+  }
+
+  NSString * keyChar = [NSString stringWithFormat:@"%c" , c];
+
+  return [dict objectForKey:keyChar];
+}