diff --git a/README.md b/README.md
index 22b71e5..266f724 100644
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ add `Toyimk` from `English`.
 switch to another input method,
 `pkill Toyimk`,
 then switch back.
-* You may increase the number in [controller.swift](src/controller.swift) to make sure your changes take effect.
+* You may change what is committed at `client.insert` in [controller.swift](src/controller.swift) to make sure your changes take effect.
 
 ## Debug
 Yes, though being a system module, input method is debuggable.
diff --git a/src/controller.swift b/src/controller.swift
index 19043e7..cd0d618 100644
--- a/src/controller.swift
+++ b/src/controller.swift
@@ -1,12 +1,40 @@
 import InputMethodKit
 
 class ToyimkInputController: IMKInputController {
+    var candidateWord: String = ""
+    var currentClient: Any! = nil
+
     override func inputText(_ string: String!, client sender: Any!) -> Bool {
         NSLog(string)
         guard let client = sender as? IMKTextInput else {
             return false
         }
-        client.insertText(string + "1", replacementRange: NSRange(location: NSNotFound, length: NSNotFound))
+        if string == " " {
+            commit(client, candidateWord + " ")
+            return true
+        }
+        currentClient = client
+        candidateWord += string
+        AppDelegate.candidates.update()
+        AppDelegate.candidates.show()
         return true
     }
+
+    override func candidates(_ sender: Any!) -> [Any]! {
+        return [candidateWord]
+    }
+
+    override func candidateSelected(_ candidateString: NSAttributedString!) {
+        guard let aString = candidateString,
+            let client = currentClient as? IMKTextInput else {
+            return
+        }
+        commit(client, aString.string)
+    }
+
+    func commit(_ client: IMKTextInput, _ text: String) {
+        candidateWord = ""
+        AppDelegate.candidates.hide()
+        client.insertText(text, replacementRange: NSRange(location: NSNotFound, length: NSNotFound))
+    }
 }
diff --git a/src/server.swift b/src/server.swift
index 6b5acfb..da6cde1 100644
--- a/src/server.swift
+++ b/src/server.swift
@@ -16,11 +16,14 @@ class NSManualApplication: NSApplication {
 
 @main
 class AppDelegate: NSObject, NSApplicationDelegate {
-    var server = IMKServer()
+    static var server = IMKServer()
+    static var candidates = IMKCandidates()
 
     func applicationDidFinishLaunching(_ notification: Notification) {
-        server = IMKServer(name: Bundle.main.infoDictionary?["InputMethodConnectionName"] as? String,
+        AppDelegate.server = IMKServer(name: Bundle.main.infoDictionary?["InputMethodConnectionName"] as? String,
             bundleIdentifier: Bundle.main.bundleIdentifier)
+        AppDelegate.candidates = IMKCandidates(server: AppDelegate.server,
+            panelType: kIMKSingleRowSteppingCandidatePanel)
         NSLog("tried connection")
     }