Revamp the macOS implementation of scancodes

- Describe keys in separate words when applicable on macOS
- Use "Option" instead of "Alt" to describe keys on macOS
- Filter key up events like key down events
- Use localize to generate keyboard events
  That is better than translating to text because several keys can
  generate the same text.
- Add fallback mapping for NumpadEnter
- Handle swapped virtual key codes with ISO keyboard

src/SFML/Window/OSX/HIDInputManager.hpp

@@ -89,7 +89,7 @@ public:
     static CFDictionaryRef copyDevicesMask(UInt32 page, UInt32 usage);
 
     ////////////////////////////////////////////////////////////
-    /// Try to convert a character into a SFML key code.
+    /// \brief Try to convert a character into a SFML key code
     ///
     /// Return sf::Keyboard::Unknown if it doesn't match any 'localized' keys.
     ///
@@ -102,7 +102,7 @@ public:
     static Keyboard::Key localizedKey(UniChar ch);
 
     ////////////////////////////////////////////////////////////
-    /// Opposite transformation as localizedKeys
+    /// \brief Opposite transformation as localizedKeys
     ///
     /// Return 0x00 (NULL) for non-convertible keys/numpad numbers.
     /// For letters, uppercase codes are returned.
@@ -112,7 +112,7 @@ public:
     static UniChar toUnicode(Keyboard::Key key);
 
     ////////////////////////////////////////////////////////////
-    /// Try to convert a virtual keycode (HID level) into a
+    /// \brief Try to convert a virtual keycode (HID level) into a
     /// SFML scancode.
     ///
     /// Return sf::Keyboard::Scan::Unknown if the keycode is unknown.
@@ -152,14 +152,6 @@ public:
     ////////////////////////////////////////////////////////////
     String getDescription(Keyboard::Scancode code);
 
-    ////////////////////////////////////////////////////////////
-    /// Regenerate the mappings from/to Key and Scancode.
-    ///
-    /// This function is public to allow regular update calls
-    /// from the manager in case there's a keyboard layout change.
-    ///
-    ////////////////////////////////////////////////////////////
-    void buildMappings();
 private:
 
     ////////////////////////////////////////////////////////////
@@ -213,6 +205,19 @@ private:
     ////////////////////////////////////////////////////////////
     void loadKey(IOHIDElementRef key);
 
+    ////////////////////////////////////////////////////////////
+    /// \brief Regenerate the mappings from/to Key and Scancode
+    ///
+    ////////////////////////////////////////////////////////////
+    void buildMappings();
+
+    ////////////////////////////////////////////////////////////
+    /// \brief Callback to regenerate mappings from/to Key and
+    /// Scancode when there's a keyboard layout change
+    ///
+    ////////////////////////////////////////////////////////////
+    static void keyboardChanged(CFNotificationCenterRef, void* observer, CFStringRef, const void*, CFDictionaryRef);
+
     ////////////////////////////////////////////////////////////
     /// \brief Release all resources
     ///
@@ -288,7 +293,7 @@ private:
     /// HID keys.
     ///
     /// The mappings (both directions) get invalidated when the
-    /// keyboard layout changes. They both default to (s)Unknown.
+    /// keyboard layout changes. They both default to (Scan::)Unknown.
     ///
     ////////////////////////////////////////////////////////////
 };

src/SFML/Window/OSX/SFOpenGLView+keyboard.mm

@@ -166,7 +166,7 @@
 
     sf::Event::KeyEvent key = [SFOpenGLView convertNSKeyEventToSFMLEvent:theEvent];
 
-    if (key.code != sf::Keyboard::Unknown) // The key is recognized.
+    if ((key.code != sf::Keyboard::Unknown) || (key.scancode != sf::Keyboard::Scan::Unknown))
         m_requester->keyUp(key);
 }
 
@@ -188,16 +188,12 @@
 ////////////////////////////////////////////////////////
 +(sf::Event::KeyEvent)convertNSKeyEventToSFMLEvent:(NSEvent*)event
 {
-    // We look for the key in a list of characters that depend on keyboard localization,
-    // if the key is not "dead".
-    NSString* string = [event charactersIgnoringModifiers];
-    sf::Keyboard::Key key = ([string length] > 0)
-        ? sf::priv::HIDInputManager::localizedKey([string characterAtIndex:0])
-        : sf::Keyboard::Unknown;
-
     // The scancode always depends on the hardware keyboard, not some OS setting.
     sf::Keyboard::Scancode code = sf::priv::HIDInputManager::nonLocalizedKey([event keyCode]);
 
+    // Get the corresponding key under the current keyboard layout.
+    sf::Keyboard::Key key = sf::Keyboard::localize(code);
+
     return keyEventWithModifiers([event modifierFlags], key, code);
 }