PR#1: macOS Notification when Kanji Conversation switch changes.

Source/AppDelegate.h

@@ -36,7 +36,7 @@
 
 @class PreferencesWindowController;
 
-@interface AppDelegate : NSObject <NSApplicationDelegate>
+@interface AppDelegate : NSObject <NSApplicationDelegate, NSUserNotificationCenterDelegate>
 {
 @private
     NSURLConnection *_updateCheckConnection;

Source/AppDelegate.m

@@ -67,6 +67,7 @@ static const NSTimeInterval kTimeoutInterval = 60.0;
     }
 
     [self checkForUpdate];
+    [[NSUserNotificationCenter defaultUserNotificationCenter] setDelegate:self];
 }
 
 - (void)checkForUpdate
@@ -268,4 +269,8 @@ static const NSTimeInterval kTimeoutInterval = 60.0;
     _updateNextStepURL = nil;
 }
 
+- (BOOL)userNotificationCenter:(NSUserNotificationCenter *)center shouldPresentNotification:(NSUserNotification *)notification{
+    return YES;
+}
+
 @end

Source/InputMethodController.h

@@ -75,6 +75,9 @@
 
     // if Chinese conversion is enabled
     BOOL _chineseConversionEnabled;
+
+    // if Chinese conversion status has been changed
+    BOOL _previousChineseConversionEnabledStatus;
 }
 @end
 

Source/InputMethodController.mm

@@ -165,6 +165,8 @@ public:
     }
     // the two client pointers are weak pointers (i.e. we don't retain them)
     // therefore we don't do anything about it
+
+    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"ChineseConversionStatusChanged" object:nil];
 }
 
 - (id)initWithServer:(IMKServer *)server delegate:(id)delegate client:(id)client
@@ -196,6 +198,10 @@ public:
 
         _inputMode = kBopomofoModeIdentifier;
         _chineseConversionEnabled = [[NSUserDefaults standardUserDefaults] boolForKey:kChineseConversionEnabledKey];
+        _previousChineseConversionEnabledStatus = _chineseConversionEnabled;
+
+        [[NSNotificationCenter defaultCenter] removeObserver:self name:@"ChineseConversionStatusChanged" object:nil];
+        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleChineseConversionStatusDidChanged:) name:@"ChineseConversionStatusChanged" object:nil];
     }
 
     return self;
@@ -1466,6 +1472,7 @@ public:
 {
     _chineseConversionEnabled = !_chineseConversionEnabled;
     [[NSUserDefaults standardUserDefaults] setBool:_chineseConversionEnabled forKey:kChineseConversionEnabledKey];
+    [[NSNotificationCenter defaultCenter] postNotificationName:@"ChineseConversionStatusChanged" object:nil];
 }
 
 - (void)clearLearningDictionary:(id)sender
@@ -1517,6 +1524,23 @@ public:
     }
 }
 
+- (void)handleChineseConversionStatusDidChanged:(NSNotification *)notification
+{
+    // Do not post the notification if status doesn't change. 
+    // This is because the input method can be initiated by multiple applications, then all of them would post the notification.
+    if (_previousChineseConversionEnabledStatus == _chineseConversionEnabled) {
+        return;
+    }
+
+    NSUserNotification *userNotification = [[NSUserNotification alloc] init];
+    userNotification.title = @"vChewing";
+    userNotification.informativeText = [NSString stringWithFormat:@"%@%@", NSLocalizedString(@"Chinese Conversion", @""), _chineseConversionEnabled ? @" Enabled" : @" Disabled"];
+    userNotification.soundName = NSUserNotificationDefaultSoundName;
+    [[NSUserNotificationCenter defaultUserNotificationCenter] deliverNotification:userNotification];
+
+    _previousChineseConversionEnabledStatus = _chineseConversionEnabled;
+}
+
 @end
 
 static void LTLoadLanguageModelFile(NSString *filenameWithoutExtension, FastLM &lm)