diff --git a/Source/Modules/ControllerModules/ctlInputMethod_Delegates.swift b/Source/Modules/ControllerModules/ctlInputMethod_Delegates.swift
index 57993eb1..c8c8b00f 100644
--- a/Source/Modules/ControllerModules/ctlInputMethod_Delegates.swift
+++ b/Source/Modules/ControllerModules/ctlInputMethod_Delegates.swift
@@ -50,6 +50,8 @@ extension ctlInputMethod: KeyHandlerDelegate {
 // MARK: - Candidate Controller Delegate
 
 extension ctlInputMethod: ctlCandidateDelegate {
+  var isAssociatedPhrasesMode: Bool { state is InputState.AssociatedPhrases }
+
   func handleDelegateEvent(_ event: NSEvent!) -> Bool {
     // 用 Shift 開關半形英數模式，僅對 macOS 10.15 及之後的 macOS 有效。
     if #available(macOS 10.15, *) {
diff --git a/Source/Modules/UIModules/CandidateUI/ctlCandidate.swift b/Source/Modules/UIModules/CandidateUI/ctlCandidate.swift
index 6d6cb12a..a4aea23a 100644
--- a/Source/Modules/UIModules/CandidateUI/ctlCandidate.swift
+++ b/Source/Modules/UIModules/CandidateUI/ctlCandidate.swift
@@ -27,6 +27,7 @@ public class CandidateKeyLabel: NSObject {
 }
 
 public protocol ctlCandidateDelegate: AnyObject {
+  var isAssociatedPhrasesMode: Bool { get }
   func handleDelegateEvent(_ event: NSEvent!) -> Bool
   func candidateCountForController(_ controller: ctlCandidateProtocol) -> Int
   func candidatesForController(_ controller: ctlCandidateProtocol) -> [(String, String)]