Fix get/set window position on OS X

src/SFML/Window/OSX/SFViewController.mm

@@ -138,7 +138,7 @@
 
 
 ////////////////////////////////////////////////////////.
--(void)setWindowPositionToX:(unsigned int)x Y:(unsigned int)y
+-(void)setWindowPositionToX:(int)x Y:(int)y
 {
     sf::err() << "Cannot move SFML area when SFML is integrated in a NSView. Use the view hanlder directly instead." << std::endl;
 }

src/SFML/Window/OSX/SFWindowController.mm

@@ -292,17 +292,30 @@
 ////////////////////////////////////////////////////////////
 -(NSPoint)position
 {
-    NSPoint pos = [m_oglView frame].origin;
+    // First, get the top left corner of the view in its own base system
+    NSPoint const origin = [m_oglView frame].origin;
+    NSSize  const size = [m_oglView frame].size;
+    NSPoint const topLeftCornerOfView = NSMakePoint(origin.x, origin.y + size.height);
+    NSPoint const positionInView = [m_oglView convertPointToBase:topLeftCornerOfView];
 
-    // Flip for SFML window coordinate system.
+    // Then, convert it to window base system
-    pos.y = [self screenHeight] - pos.y;
+    NSPoint const positionInWindow = [m_oglView convertPoint:positionInView toView:nil];
+    // here nil denotes the window containing the view
 
-    return pos;
+    // Next, convert it to the screen base system
+    NSPoint const positionInScreen = [[m_oglView window] convertBaseToScreen:positionInWindow];
+    
+    // Finally, flip for SFML window coordinate system
+    // Don't forget to discard the title bar !
+    NSPoint const positionInSFML = NSMakePoint(positionInScreen.x,
+                                               ([self screenHeight] - [self titlebarHeight]) - positionInScreen.y);
+    
+    return positionInSFML;
 }
 
 
 ////////////////////////////////////////////////////////.
--(void)setWindowPositionToX:(unsigned int)x Y:(unsigned int)y
+-(void)setWindowPositionToX:(int)x Y:(int)y
 {
     NSPoint point = NSMakePoint(x, y);
     

src/SFML/Window/OSX/WindowImplDelegateProtocol.h

@@ -104,7 +104,7 @@ namespace sf {
 /// Move the window (not the view if we handle not a window) (SFML Coordinates).
 ///
 ////////////////////////////////////////////////////////////
--(void)setWindowPositionToX:(unsigned int)x Y:(unsigned int)y;
+-(void)setWindowPositionToX:(int)x Y:(int)y;
 
 ////////////////////////////////////////////////////////////
 /// Get window's size.