diff --git a/Source/Headers/vChewing-Bridging-Header.h b/Source/Headers/vChewing-Bridging-Header.h
index d78ca431..bd2f463e 100644
--- a/Source/Headers/vChewing-Bridging-Header.h
+++ b/Source/Headers/vChewing-Bridging-Header.h
@@ -25,3 +25,4 @@ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR TH
 
 #import "KeyHandler.h"
 #import "mgrLangModel.h"
+#import "ObjCUtils.h"
diff --git a/Source/Modules/IMEModules/ObjCUtils.h b/Source/Modules/IMEModules/ObjCUtils.h
new file mode 100644
index 00000000..35b39250
--- /dev/null
+++ b/Source/Modules/IMEModules/ObjCUtils.h
@@ -0,0 +1,18 @@
+//
+//  OjbCUtils.h
+//  vChewing
+//
+//  Created by ShikiSuen on 2022/3/28.
+//
+
+#import <Cocoa/Cocoa.h>
+#import <InputMethodKit/InputMethodKit.h>
+#import "vChewing-Swift.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface ObjCUtils : NSObject
++ (bool)keyboardSwitchCondition:(NSEvent *)event;
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/Source/Modules/IMEModules/ObjCUtils.m b/Source/Modules/IMEModules/ObjCUtils.m
new file mode 100644
index 00000000..9563d026
--- /dev/null
+++ b/Source/Modules/IMEModules/ObjCUtils.m
@@ -0,0 +1,16 @@
+//
+//  OjbCUtils.m
+//  vChewing
+//
+//  Created by ShikiSuen on 2022/3/28.
+//
+
+#import "ObjCUtils.h"
+
+@implementation ObjCUtils
+
++ (bool)keyboardSwitchCondition:(NSEvent *)event {
+    return ((event.modifierFlags & ~NSEventModifierFlagShift) || ((event.modifierFlags & NSEventModifierFlagShift) && mgrPrefs.functionKeyKeyboardLayoutOverrideIncludeShiftKey));
+}
+
+@end
diff --git a/vChewing.xcodeproj/project.pbxproj b/vChewing.xcodeproj/project.pbxproj
index 59bdecf3..e1949c2c 100644
--- a/vChewing.xcodeproj/project.pbxproj
+++ b/vChewing.xcodeproj/project.pbxproj
@@ -41,6 +41,7 @@
 		5BBBB77627AED70B0023B93A /* MenuIcon-TCVIM.png in Resources */ = {isa = PBXBuildFile; fileRef = 5BBBB77227AED70B0023B93A /* MenuIcon-TCVIM.png */; };
 		5BBBB77A27AEDC690023B93A /* clsSFX.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5BBBB77927AEDC690023B93A /* clsSFX.swift */; };
 		5BC2652227E04B7E00700291 /* uninstall.sh in Resources */ = {isa = PBXBuildFile; fileRef = 5BC2652127E04B7B00700291 /* uninstall.sh */; };
+		5BCD76CF27F1484D00C41430 /* ObjCUtils.m in Sources */ = {isa = PBXBuildFile; fileRef = 5BCD76CE27F1484D00C41430 /* ObjCUtils.m */; };
 		5BD05B8127B22F3C004C4F1D /* char-kanji-cns.txt in Resources */ = {isa = PBXBuildFile; fileRef = 5BD05B8027B22F3C004C4F1D /* char-kanji-cns.txt */; };
 		5BD05BCA27B2A43D004C4F1D /* Images.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 6A2E40F5253A69DA00D1AE1D /* Images.xcassets */; };
 		5BD05C5D27B2BBA9004C4F1D /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 5BD05C5B27B2BBA9004C4F1D /* Main.storyboard */; };
@@ -199,6 +200,8 @@
 		5BBBB77927AEDC690023B93A /* clsSFX.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = clsSFX.swift; sourceTree = "<group>"; };
 		5BBD627827B6C4D900271480 /* Update-Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = "Update-Info.plist"; sourceTree = "<group>"; };
 		5BC2652127E04B7B00700291 /* uninstall.sh */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.script.sh; lineEnding = 0; path = uninstall.sh; sourceTree = "<group>"; };
+		5BCD76CD27F1484D00C41430 /* ObjCUtils.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = ObjCUtils.h; path = Source/Modules/IMEModules/ObjCUtils.h; sourceTree = SOURCE_ROOT; };
+		5BCD76CE27F1484D00C41430 /* ObjCUtils.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; name = ObjCUtils.m; path = Source/Modules/IMEModules/ObjCUtils.m; sourceTree = SOURCE_ROOT; };
 		5BD05B8027B22F3C004C4F1D /* char-kanji-cns.txt */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; name = "char-kanji-cns.txt"; path = "Data/components/common/char-kanji-cns.txt"; sourceTree = "<group>"; };
 		5BD05BB827B2A429004C4F1D /* vChewingPhraseEditor.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = vChewingPhraseEditor.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		5BD05BC627B2A42A004C4F1D /* vChewingPhraseEditor.entitlements */ = {isa = PBXFileReference; lastKnownFileType = text.plist.entitlements; path = vChewingPhraseEditor.entitlements; sourceTree = "<group>"; };
@@ -409,6 +412,8 @@
 				D4A13D5927A59D5C003BE359 /* ctlInputMethod.swift */,
 				5B62A33127AE792F00A19448 /* InputSourceHelper.swift */,
 				5B62A33527AE795800A19448 /* mgrPrefs.swift */,
+				5BCD76CD27F1484D00C41430 /* ObjCUtils.h */,
+				5BCD76CE27F1484D00C41430 /* ObjCUtils.m */,
 			);
 			path = IMEModules;
 			sourceTree = "<group>";
@@ -971,6 +976,7 @@
 				D47D73AC27A6CAE600255A50 /* AssociatedPhrases.mm in Sources */,
 				5B62A34A27AE7CD900A19448 /* NotifierController.swift in Sources */,
 				5B11328927B94CFB00E58451 /* AppleKeyboardConverter.swift in Sources */,
+				5BCD76CF27F1484D00C41430 /* ObjCUtils.m in Sources */,
 				D41355DB278E6D17005E5CBD /* LMInstantiator.mm in Sources */,
 				5B62A32927AE77D100A19448 /* FSEventStreamHelper.swift in Sources */,
 				D47F7DD3278C1263002F9DD7 /* UserOverrideModel.cpp in Sources */,