From 590998c190de5580d1f4c0ef43a685f6eb09a7df Mon Sep 17 00:00:00 2001
From: Hiraku <dev@hiraku.tw>
Date: Mon, 24 Jan 2022 22:19:17 +0800
Subject: [PATCH] Hiraku: MUI Selector // phase 1: Implementing function.

---
 Source/Base.lproj/preferences.xib        |  4 ++
 Source/PreferencesModule.swift           |  5 +++
 Source/PreferencesWindowController.swift | 48 ++++++++++++++++++++++++
 3 files changed, 57 insertions(+)

diff --git a/Source/Base.lproj/preferences.xib b/Source/Base.lproj/preferences.xib
index f5922a7b..8d6483fd 100644
--- a/Source/Base.lproj/preferences.xib
+++ b/Source/Base.lproj/preferences.xib
@@ -11,6 +11,7 @@
                 <outlet property="basisKeyboardLayoutButton" destination="124" id="135"/>
                 <outlet property="fontSizePopUpButton" destination="90" id="108"/>
                 <outlet property="selectionKeyComboBox" destination="uHU-aL-du7" id="cEx-Ui-Phc"/>
+                <outlet property="uiLanguageButton" destination="oS6-u5-7dP" id="V3u-XK-z7G"/>
                 <outlet property="window" destination="1" id="30"/>
             </connections>
         </customObject>
@@ -106,6 +107,9 @@
                                                                 </items>
                                                             </menu>
                                                         </popUpButtonCell>
+                                                        <connections>
+                                                            <action selector="updateUiLanguageAction:" target="-2" id="8XG-O0-Otf"/>
+                                                        </connections>
                                                     </popUpButton>
                                                     <textField horizontalHuggingPriority="249" verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="L5M-VG-W1X">
                                                         <rect key="frame" x="42" y="99" width="123" height="17"/>
diff --git a/Source/PreferencesModule.swift b/Source/PreferencesModule.swift
index ba583745..cd6267df 100644
--- a/Source/PreferencesModule.swift
+++ b/Source/PreferencesModule.swift
@@ -13,6 +13,7 @@ private let kBasisKeyboardLayoutPreferenceKey = "BasisKeyboardLayout"  // alphan
 private let kFunctionKeyKeyboardLayoutPreferenceKey = "FunctionKeyKeyboardLayout"  // alphanumeric ("ASCII") input basi
 private let kFunctionKeyKeyboardLayoutOverrideIncludeShiftKey = "FunctionKeyKeyboardLayoutOverrideIncludeShift" // whether include shif
 private let kCandidateListTextSizeKey = "CandidateListTextSize"
+private let kAppleLanguagesPreferencesKey = "AppleLanguages"
 private let kSelectPhraseAfterCursorAsCandidatePreferenceKey = "SelectPhraseAfterCursorAsCandidate"
 private let kUseHorizontalCandidateListPreferenceKey = "UseHorizontalCandidateList"
 private let kComposingBufferSizePreferenceKey = "ComposingBufferSize"
@@ -172,6 +173,7 @@ struct ComposingBufferSize {
         defaults.removeObject(forKey: kFunctionKeyKeyboardLayoutPreferenceKey)
         defaults.removeObject(forKey: kFunctionKeyKeyboardLayoutOverrideIncludeShiftKey)
         defaults.removeObject(forKey: kCandidateListTextSizeKey)
+        defaults.removeObject(forKey: kAppleLanguagesPreferencesKey)
         defaults.removeObject(forKey: kSelectPhraseAfterCursorAsCandidatePreferenceKey)
         defaults.removeObject(forKey: kUseHorizontalCandidateListPreferenceKey)
         defaults.removeObject(forKey: kComposingBufferSizePreferenceKey)
@@ -189,6 +191,9 @@ struct ComposingBufferSize {
         defaults.removeObject(forKey: kMaxCandidateLength)
         defaults.removeObject(forKey: kShouldNotFartInLieuOfBeep)
     }
+    
+    @UserDefault(key: kAppleLanguagesPreferencesKey, defaultValue: [])
+    @objc static var appleLanguages: Array<String>
 
     @UserDefault(key: kKeyboardLayoutPreferenceKey, defaultValue: 0)
     @objc static var keyboardLayout: Int
diff --git a/Source/PreferencesWindowController.swift b/Source/PreferencesWindowController.swift
index d2f41522..0da4c332 100644
--- a/Source/PreferencesWindowController.swift
+++ b/Source/PreferencesWindowController.swift
@@ -22,11 +22,40 @@ extension RangeReplaceableCollection where Element: Hashable {
 // the "InputMethodServerPreferencesWindowControllerClass" in Info.plist.
 @objc(PreferencesWindowController) class PreferencesWindowController: NSWindowController {
     @IBOutlet weak var fontSizePopUpButton: NSPopUpButton!
+    @IBOutlet weak var uiLanguageButton: NSPopUpButton!
     @IBOutlet weak var basisKeyboardLayoutButton: NSPopUpButton!
     @IBOutlet weak var selectionKeyComboBox: NSComboBox!
     @IBOutlet weak var clickedWhetherIMEShouldNotFartToggle: NSButton!
+    
+    var currentLanguageSelectItem: NSMenuItem? = nil
 
     override func awakeFromNib() {
+        let languages = ["auto", "en-US", "zh-CN", "zh-TW", "ja-JP"]
+        var autoSelectItem: NSMenuItem? = nil
+        var chosenLanguageItem: NSMenuItem? = nil
+        uiLanguageButton.menu?.removeAllItems()
+        
+        let appleLanguages = Preferences.appleLanguages
+        for language in languages {
+            let menuItem = NSMenuItem()
+            menuItem.title = NSLocalizedString(language, comment: "")
+            menuItem.representedObject = language
+            
+            if language == "auto" {
+                autoSelectItem = menuItem
+            }
+            
+            if !appleLanguages.isEmpty {
+                if appleLanguages[0] == language {
+                    chosenLanguageItem = menuItem
+                }
+            }
+            uiLanguageButton.menu?.addItem(menuItem)
+        }
+        
+        currentLanguageSelectItem = chosenLanguageItem ?? autoSelectItem
+        uiLanguageButton.select(currentLanguageSelectItem)
+
         let list = TISCreateInputSourceList(nil, true).takeRetainedValue() as! [TISInputSource]
         var usKeyboardLayoutItem: NSMenuItem? = nil
         var chosenItem: NSMenuItem? = nil
@@ -124,6 +153,25 @@ extension RangeReplaceableCollection where Element: Hashable {
             Preferences.basisKeyboardLayout = sourceID
         }
     }
+    
+    @IBAction func updateUiLanguageAction(_ sender: Any) {
+        if let selectItem = uiLanguageButton.selectedItem {
+            if currentLanguageSelectItem == selectItem {
+                return
+            }
+        }
+        if let language = uiLanguageButton.selectedItem?.representedObject as? String {
+            if (language != "auto") {
+                Preferences.appleLanguages = [language]
+            }
+            else {
+                UserDefaults.standard.removeObject(forKey: "AppleLanguages")
+            }
+            
+            NSLog("vChewing App self-terminated due to UI language change.")
+            NSApplication.shared.terminate(nil)
+        }
+    }
 
     @IBAction func clickedWhetherIMEShouldNotFartToggleAction(_ sender: Any) {
         clsSFX.beep()