diff --git a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/CtlCandidateTDK.swift b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/CtlCandidateTDK.swift
index 14755e89..50f44ed8 100644
--- a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/CtlCandidateTDK.swift
+++ b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/CtlCandidateTDK.swift
@@ -111,6 +111,7 @@ public class CtlCandidateTDK: CtlCandidate, NSWindowDelegate {
     if let currentCandidateText = Self.thePool.currentSelectedCandidateText {
       reverseLookupResult = delegate?.reverseLookup(for: currentCandidateText) ?? []
       Self.thePool.reverseLookupResult = reverseLookupResult
+      Self.thePool.tooltip = delegate?.candidateToolTip(shortened: !Self.thePool.isMatrix) ?? ""
     }
     delegate?.candidatePairHighlightChanged(at: highlightedIndex)
     DispatchQueue.main.async { [self] in
diff --git a/Packages/vChewing_MainAssembly/Sources/MainAssembly/SessionCtl_Delegates.swift b/Packages/vChewing_MainAssembly/Sources/MainAssembly/SessionCtl_Delegates.swift
index c8cb811d..8b1fd3c7 100644
--- a/Packages/vChewing_MainAssembly/Sources/MainAssembly/SessionCtl_Delegates.swift
+++ b/Packages/vChewing_MainAssembly/Sources/MainAssembly/SessionCtl_Delegates.swift
@@ -92,6 +92,19 @@ extension SessionCtl: CtlCandidateDelegate {
 
   public var showReverseLookupResult: Bool { PrefMgr.shared.showReverseLookupInCandidateUI }
 
+  public func candidateToolTip(shortened: Bool) -> String {
+    if state.type == .ofAssociates {
+      return shortened ? "⇧" : NSLocalizedString("Hold ⇧ to choose associates.", comment: "")
+    } else if state.type == .ofInputting, state.isCandidateContainer {
+      let useShift = LMMgr.currentLM.areCassetteCandidateKeysShiftHeld
+      let theEmoji = useShift ? "⬆️" : "⚡️"
+      return shortened ? theEmoji : "\(theEmoji) " + NSLocalizedString("Quick Candidates", comment: "")
+    } else if PrefMgr.shared.cassetteEnabled {
+      return shortened ? "📼" : "📼 " + NSLocalizedString("CIN Cassette Mode", comment: "")
+    }
+    return ""
+  }
+
   @discardableResult public func reverseLookup(for value: String) -> [String] {
     let blankResult: [String] = []
     // 這一段專門處理「反查」。
diff --git a/Packages/vChewing_MainAssembly/Sources/MainAssembly/SessionCtl_HandleDisplay.swift b/Packages/vChewing_MainAssembly/Sources/MainAssembly/SessionCtl_HandleDisplay.swift
index ea983f18..768abb7d 100644
--- a/Packages/vChewing_MainAssembly/Sources/MainAssembly/SessionCtl_HandleDisplay.swift
+++ b/Packages/vChewing_MainAssembly/Sources/MainAssembly/SessionCtl_HandleDisplay.swift
@@ -96,19 +96,6 @@ public extension SessionCtl {
       name: PrefMgr.shared.candidateTextFontName, size: PrefMgr.shared.candidateListTextSize
     )
 
-    if state.type == .ofAssociates {
-      candidateUI?.tooltip =
-        singleLine ? "⇧" : NSLocalizedString("Hold ⇧ to choose associates.", comment: "")
-    } else if state.type == .ofInputting, state.isCandidateContainer {
-      let useShift = LMMgr.currentLM.areCassetteCandidateKeysShiftHeld
-      let theEmoji = useShift ? "⬆️" : "⚡️"
-      candidateUI?.tooltip =
-        singleLine ? theEmoji : "\(theEmoji) " + NSLocalizedString("Quick Candidates", comment: "")
-    } else if PrefMgr.shared.cassetteEnabled {
-      candidateUI?.tooltip =
-        singleLine ? "📼" : "📼 " + NSLocalizedString("CIN Cassette Mode", comment: "")
-    }
-
     candidateUI?.locale = {
       switch inputMode {
       case .imeModeCHS: return "zh-Hans"
diff --git a/Packages/vChewing_Shared/Sources/Shared/Protocols/CtlCandidateProtocol.swift b/Packages/vChewing_Shared/Sources/Shared/Protocols/CtlCandidateProtocol.swift
index 135c8188..113a5297 100644
--- a/Packages/vChewing_Shared/Sources/Shared/Protocols/CtlCandidateProtocol.swift
+++ b/Packages/vChewing_Shared/Sources/Shared/Protocols/CtlCandidateProtocol.swift
@@ -13,7 +13,7 @@ public protocol CtlCandidateDelegate {
   func candidatePairSelectionConfirmed(at index: Int)
   func candidatePairHighlightChanged(at index: Int)
   func candidatePairRightClicked(at index: Int, action: CandidateContextMenuAction)
-  func candidates(_ sender: Any!) -> [Any]!
+  func candidateToolTip(shortened: Bool) -> String
   func resetCandidateWindowOrigin()
   @discardableResult func reverseLookup(for value: String) -> [String]
   var selectionKeys: String { get }