Improved mouse events on OS X (close #213, related to #277)

src/SFML/Window/OSX/SFOpenGLView.h

@@ -41,6 +41,8 @@ namespace sf {
 ///
 /// Handle event and send them back to the requester.
 ///
+/// NSTrackingArea is used to keep track of mouse events.
+///
 /// In order to send correct mouse coordonate to the requester when
 /// the window is in fullscreen we use m_realSize to represent the
 /// back buffer size (see SFWindowController). If 'm_realSize' is
@@ -54,8 +56,8 @@ namespace sf {
 @interface SFOpenGLView : NSOpenGLView {
     sf::priv::WindowImplCocoa*    m_requester;
     BOOL                          m_useKeyRepeat;
-    NSTrackingRectTag             m_trackingTag;
     BOOL                          m_mouseIsIn;
+    NSTrackingArea*               m_trackingArea;
     NSSize                        m_realSize;
 
     // Hidden text view used to convert key event to actual chars.

src/SFML/Window/OSX/SFOpenGLView.mm

@@ -102,12 +102,14 @@ BOOL isValidTextUnicode(NSEvent* event);
         [self enableKeyRepeat];
         m_realSize = NSZeroSize;
         
-        // Register for mouse-move event
+        // Register for mouse move event
         m_mouseIsIn = [self isMouseInside];
-        m_trackingTag = [self addTrackingRect:[self frame]
+        NSUInteger opts = (NSTrackingActiveAlways | NSTrackingMouseEnteredAndExited | NSTrackingMouseMoved | NSTrackingEnabledDuringMouseDrag);
+        m_trackingArea = [[NSTrackingArea alloc] initWithRect:[self bounds]
+                                                      options:opts
                                                         owner:self
-                                     userData:nil
+                                                     userInfo:nil];
-                                 assumeInside:m_mouseIsIn];
+        [self addTrackingArea:m_trackingArea];
         
         // Register for resize event
         NSNotificationCenter* center = [NSNotificationCenter defaultCenter];
@@ -194,13 +196,6 @@ BOOL isValidTextUnicode(NSEvent* event);
     // Update mouse internal state.
     [self updateMouseState];
     
-    // Adapt tracking area for mouse mouse event.
-    [self removeTrackingRect:m_trackingTag];
-    m_trackingTag = [self addTrackingRect:[self frame]
-                                    owner:self
-                                 userData:nil
-                             assumeInside:m_mouseIsIn];
-    
     // Update the OGL view to fit the new size.
     [self update];
     
@@ -249,13 +244,16 @@ BOOL isValidTextUnicode(NSEvent* event);
 ////////////////////////////////////////////////////////
 -(void)dealloc
 {
+    // Unregister
+    [[NSNotificationCenter defaultCenter] removeObserver:self];
+    [self removeTrackingArea:m_trackingArea];
+
     // Release attributes
     [m_hiddenTextView release];
     [m_silentResponder release];
+    [m_trackingArea release];
 
-    // Unregister
+    [self setRequesterTo:0];
-    [[NSNotificationCenter defaultCenter] removeObserver:self];
-    [self removeTrackingRect:m_trackingTag];
 
     [super dealloc];
 }