Added OS X impl of requestFocus and hasFocus

Signed-off-by: Foaly <foaly.f@web.de>
Signed-off-by: Jan Haller <bromeon@gmail.com>

src/SFML/Window/OSX/SFViewController.mm

@@ -187,6 +187,28 @@
 }
 
 
+////////////////////////////////////////////////////////
+-(BOOL)requestFocus
+{
+    // Note: this doesn't imply that the view will get any event.
+    // The user has to make sure events are forwarded to the view
+    // with the usual responder chain.
+    [[m_view window] makeKeyAndOrderFront:nil];
+
+    // In case the app is not active, make its dock icon bounce for one sec
+    [NSApp requestUserAttention:NSInformationalRequest];
+
+    return [self hasFocus];
+}
+
+
+////////////////////////////////////////////////////////////
+-(BOOL)hasFocus
+{
+    return [NSApp keyWindow] == [m_view window];
+}
+
+
 ////////////////////////////////////////////////////////
 -(void)enableKeyRepeat
 {

src/SFML/Window/OSX/SFWindowController.mm

@@ -451,6 +451,25 @@
 }
 
 
+////////////////////////////////////////////////////////
+-(BOOL)requestFocus
+{
+    [m_window makeKeyAndOrderFront:nil];
+
+    // In case the app is not active, make its dock icon bounce for one sec
+    [NSApp requestUserAttention:NSInformationalRequest];
+
+    return [self hasFocus];
+}
+
+
+////////////////////////////////////////////////////////////
+-(BOOL)hasFocus
+{
+    return [NSApp keyWindow] == m_window;
+}
+
+
 ////////////////////////////////////////////////////////
 -(void)enableKeyRepeat
 {

src/SFML/Window/OSX/WindowImplDelegateProtocol.h

@@ -166,6 +166,23 @@ namespace sf {
 ////////////////////////////////////////////////////////////
 -(void)closeWindow;
 
+////////////////////////////////////////////////////////////
+/// \brief Request the current window to be made the active
+///        foreground window
+///
+/// \return True if operation was successful, false otherwise
+///
+////////////////////////////////////////////////////////////
+-(BOOL)requestFocus;
+
+////////////////////////////////////////////////////////////
+/// \brief Determine whether the window has the input focus
+///
+/// \return True if window has focus, false otherwise
+///
+////////////////////////////////////////////////////////////
+-(BOOL)hasFocus;
+
 ////////////////////////////////////////////////////////////
 /// \brief Enable key repeat
 ///