diff --git a/Source/Modules/InputHandler_Core.swift b/Source/Modules/InputHandler_Core.swift
index 5f3d064d..05d449a1 100644
--- a/Source/Modules/InputHandler_Core.swift
+++ b/Source/Modules/InputHandler_Core.swift
@@ -22,7 +22,9 @@ public protocol InputHandlerProtocol {
   var currentUOM: vChewingLM.LMUserOverride { get set }
   var delegate: InputHandlerDelegate? { get set }
   var composer: Tekkon.Composer { get set }
+  var isComposerUsingPinyin: Bool { get }
   func clear()
+  func clearComposerAndCalligrapher()
   func ensureKeyboardParser()
   func handleEvent(_ event: NSEvent) -> Bool
   func generateStateOfInputting() -> IMEStateProtocol
@@ -82,9 +84,8 @@ public class InputHandler: InputHandlerProtocol {
   }
 
   public func clear() {
-    composer.clear()
+    clearComposerAndCalligrapher()
     compositor.clear()
-    calligrapher.removeAll()
   }
 
   // MARK: - Functions dealing with Megrez.
@@ -367,8 +368,11 @@ public class InputHandler: InputHandlerProtocol {
     composer.phonabetCombinationCorrectionEnabled = prefs.autoCorrectReadingCombination
   }
 
-  func clearComposerAndCalligrapher() {
-    _ = prefs.cassetteEnabled ? calligrapher.removeAll() : composer.clear()
+  public var isComposerUsingPinyin: Bool { composer.parser.rawValue >= 100 }
+
+  public func clearComposerAndCalligrapher() {
+    calligrapher.removeAll()
+    composer.clear()
   }
 
   func letComposerAndCalligrapherDoBackSpace() {
diff --git a/Source/Modules/SessionCtl_Core.swift b/Source/Modules/SessionCtl_Core.swift
index 3d99c1ad..3e3fe8d6 100644
--- a/Source/Modules/SessionCtl_Core.swift
+++ b/Source/Modules/SessionCtl_Core.swift
@@ -169,7 +169,7 @@ extension SessionCtl {
   public func resetInputHandler() {
     // 過濾掉尚未完成拼寫的注音。
     if state.type == .ofInputting, PrefMgr.shared.trimUnfinishedReadingsOnCommit {
-      inputHandler.composer.clear()
+      inputHandler.clearComposerAndCalligrapher()
       switchState(inputHandler.generateStateOfInputting())
     }
     // 威注音不再在這裡對 IMKTextInput 客體黑名單當中的應用做資安措施。
diff --git a/Source/Modules/SessionCtl_HandleEvent.swift b/Source/Modules/SessionCtl_HandleEvent.swift
index c0c95793..63f85908 100644
--- a/Source/Modules/SessionCtl_HandleEvent.swift
+++ b/Source/Modules/SessionCtl_HandleEvent.swift
@@ -117,7 +117,7 @@ extension SessionCtl {
     }
 
     // 在啟用注音排列而非拼音輸入的情況下，強制將當前鍵盤佈局翻譯為美規鍵盤。
-    if inputHandler.composer.parser.rawValue < 100 || IMKHelper.isDynamicBasicKeyboardLayoutEnabled {
+    if !inputHandler.isComposerUsingPinyin || IMKHelper.isDynamicBasicKeyboardLayoutEnabled {
       eventToDeal = eventToDeal.inAppleABCStaticForm
     }