Cocoa: Remove subclassing of NSApplication

This removes the GLFW NSApplication subclass as a step towards better
coexistence with other libraries that touch Cocoa.

This moves application object creation to platform init to allow event
processing before window creation.

Related to #1317.

src/cocoa_init.m

@@ -27,6 +27,10 @@
 #include "internal.h"
 #include <sys/param.h> // For MAXPATHLEN
 
+#if MAC_OS_X_VERSION_MAX_ALLOWED < 101200
+ #define NSEventMaskKeyUp NSKeyUpMask
+ #define NSEventModifierFlagCommand NSCommandKeyMask
+#endif
 
 // Change to our application bundle's resources directory, if present
 //
@@ -271,17 +275,21 @@ static GLFWbool initializeTIS(void)
     return updateUnicodeDataNS();
 }
 
-@interface GLFWLayoutListener : NSObject
+@interface GLFWHelper : NSObject
 @end
 
-@implementation GLFWLayoutListener
+@implementation GLFWHelper
 
 - (void)selectedKeyboardInputSourceChanged:(NSObject* )object
 {
     updateUnicodeDataNS();
 }
 
-@end
+- (void)doNothing:(id)object
+{
+}
+
+@end // GLFWHelper
 
 
 //////////////////////////////////////////////////////////////////////////
@@ -291,13 +299,31 @@ static GLFWbool initializeTIS(void)
 int _glfwPlatformInit(void)
 {
     _glfw.ns.autoreleasePool = [[NSAutoreleasePool alloc] init];
+    _glfw.ns.helper = [[GLFWHelper alloc] init];
+
+    [NSThread detachNewThreadSelector:@selector(doNothing:)
+                             toTarget:_glfw.ns.helper
+                           withObject:nil];
+
+    [NSApplication sharedApplication];
+
+    NSEvent* (^block)(NSEvent*) = ^ NSEvent* (NSEvent* event)
+    {
+        if ([event modifierFlags] & NSEventModifierFlagCommand)
+            [[NSApp keyWindow] sendEvent:event];
+
+        return event;
+    };
+
+    _glfw.ns.keyUpMonitor =
+        [NSEvent addLocalMonitorForEventsMatchingMask:NSEventMaskKeyUp
+                                              handler:block];
 
     if (_glfw.hints.init.ns.chdir)
         changeToResourcesDirectory();
 
-    _glfw.ns.listener = [[GLFWLayoutListener alloc] init];
     [[NSNotificationCenter defaultCenter]
-        addObserver:_glfw.ns.listener
+        addObserver:_glfw.ns.helper
            selector:@selector(selectedKeyboardInputSourceChanged:)
                name:NSTextInputContextKeyboardSelectionDidChangeNotification
              object:nil];
@@ -342,18 +368,21 @@ void _glfwPlatformTerminate(void)
         _glfw.ns.delegate = nil;
     }
 
-    if (_glfw.ns.listener)
+    if (_glfw.ns.helper)
     {
         [[NSNotificationCenter defaultCenter]
-            removeObserver:_glfw.ns.listener
+            removeObserver:_glfw.ns.helper
                       name:NSTextInputContextKeyboardSelectionDidChangeNotification
                     object:nil];
         [[NSNotificationCenter defaultCenter]
-            removeObserver:_glfw.ns.listener];
-        [_glfw.ns.listener release];
-        _glfw.ns.listener = nil;
+            removeObserver:_glfw.ns.helper];
+        [_glfw.ns.helper release];
+        _glfw.ns.helper = nil;
     }
 
+    if (_glfw.ns.keyUpMonitor)
+        [NSEvent removeMonitor:_glfw.ns.keyUpMonitor];
+
     free(_glfw.ns.clipboardString);
 
     _glfwTerminateNSGL();

src/cocoa_platform.h

@@ -109,7 +109,9 @@ typedef struct _GLFWlibraryNS
     TISInputSourceRef   inputSource;
     IOHIDManagerRef     hidManager;
     id                  unicodeData;
-    id                  listener;
+    id                  helper;
+    id                  keyUpMonitor;
+    id                  nibObjects;
 
     char                keyName[64];
     short int           keycodes[256];

src/cocoa_window.m

@@ -46,7 +46,6 @@
  #define NSEventModifierFlagDeviceIndependentFlagsMask NSDeviceIndependentModifierFlagsMask
  #define NSEventMaskAny NSAnyEventMask
  #define NSEventTypeApplicationDefined NSApplicationDefined
- #define NSEventTypeKeyUp NSKeyUp
  #define NSBitmapFormatAlphaNonpremultiplied NSAlphaNonpremultipliedBitmapFormat
 #endif
 
@@ -856,52 +855,6 @@ static const NSRange kEmptyRange = { NSNotFound, 0 };
 @end
 
 
-//------------------------------------------------------------------------
-// GLFW application class
-//------------------------------------------------------------------------
-
-@interface GLFWApplication : NSApplication
-{
-    NSArray* nibObjects;
-}
-
-@end
-
-@implementation GLFWApplication
-
-// From http://cocoadev.com/index.pl?GameKeyboardHandlingAlmost
-// This works around an AppKit bug, where key up events while holding
-// down the command key don't get sent to the key window.
-- (void)sendEvent:(NSEvent *)event
-{
-    if ([event type] == NSEventTypeKeyUp &&
-        ([event modifierFlags] & NSEventModifierFlagCommand))
-    {
-        [[self keyWindow] sendEvent:event];
-    }
-    else
-        [super sendEvent:event];
-}
-
-
-// No-op thread entry point
-//
-- (void)doNothing:(id)object
-{
-}
-
-- (void)loadMainMenu
-{
-#if MAC_OS_X_VERSION_MAX_ALLOWED >= 1080
-    [[NSBundle mainBundle] loadNibNamed:@"MainMenu"
-                                  owner:NSApp
-                        topLevelObjects:&nibObjects];
-#else
-    [[NSBundle mainBundle] loadNibNamed:@"MainMenu" owner:NSApp];
-#endif
-}
-@end
-
 // Set up the menu bar (manually)
 // This is nasty, nasty stuff -- calls to undocumented semi-private APIs that
 // could go away at any moment, lots of stuff that really should be
@@ -1011,16 +964,20 @@ static void createMenuBar(void)
 //
 static GLFWbool initializeAppKit(void)
 {
-    if (NSApp)
+    if (_glfw.ns.delegate)
         return GLFW_TRUE;
 
-    // Implicitly create shared NSApplication instance
-    [GLFWApplication sharedApplication];
+    // There can only be one application delegate, but we allocate it the
+    // first time a window is created to keep all window code in this file
+    _glfw.ns.delegate = [[GLFWApplicationDelegate alloc] init];
+    if (_glfw.ns.delegate == nil)
+    {
+        _glfwInputError(GLFW_PLATFORM_ERROR,
+                        "Cocoa: Failed to create application delegate");
+        return GLFW_FALSE;
+    }
 
-    // Make Cocoa enter multi-threaded mode
-    [NSThread detachNewThreadSelector:@selector(doNothing:)
-                             toTarget:NSApp
-                           withObject:nil];
+    [NSApp setDelegate:_glfw.ns.delegate];
 
     if (_glfw.hints.init.ns.menubar)
     {
@@ -1032,22 +989,19 @@ static GLFWbool initializeAppKit(void)
         // of NSApplicationMain
 
         if ([[NSBundle mainBundle] pathForResource:@"MainMenu" ofType:@"nib"])
-            [NSApp loadMainMenu];
+        {
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= 1080
+            [[NSBundle mainBundle] loadNibNamed:@"MainMenu"
+                                          owner:NSApp
+                                topLevelObjects:&_glfw.ns.nibObjects];
+#else
+            [[NSBundle mainBundle] loadNibNamed:@"MainMenu" owner:NSApp];
+#endif
+        }
         else
             createMenuBar();
     }
 
-    // There can only be one application delegate, but we allocate it the
-    // first time a window is created to keep all window code in this file
-    _glfw.ns.delegate = [[GLFWApplicationDelegate alloc] init];
-    if (_glfw.ns.delegate == nil)
-    {
-        _glfwInputError(GLFW_PLATFORM_ERROR,
-                        "Cocoa: Failed to create application delegate");
-        return GLFW_FALSE;
-    }
-
-    [NSApp setDelegate:_glfw.ns.delegate];
     [NSApp run];
 
     // Press and Hold prevents some keys from emitting repeated characters
@@ -1554,9 +1508,6 @@ void _glfwPlatformSetWindowOpacity(_GLFWwindow* window, float opacity)
 
 void _glfwPlatformPollEvents(void)
 {
-    if (!initializeAppKit())
-        return;
-
     for (;;)
     {
         NSEvent* event = [NSApp nextEventMatchingMask:NSEventMaskAny
@@ -1707,9 +1658,6 @@ int _glfwPlatformCreateCursor(_GLFWcursor* cursor,
     NSImage* native;
     NSBitmapImageRep* rep;
 
-    if (!initializeAppKit())
-        return GLFW_FALSE;
-
     rep = [[NSBitmapImageRep alloc]
         initWithBitmapDataPlanes:NULL
                       pixelsWide:image->width
@@ -1745,9 +1693,6 @@ int _glfwPlatformCreateCursor(_GLFWcursor* cursor,
 
 int _glfwPlatformCreateStandardCursor(_GLFWcursor* cursor, int shape)
 {
-    if (!initializeAppKit())
-        return GLFW_FALSE;
-
     if (shape == GLFW_ARROW_CURSOR)
         cursor->ns.object = [NSCursor arrowCursor];
     else if (shape == GLFW_IBEAM_CURSOR)