MacOS ≥ 10.10: Fl_Window::fullscreen() and fullscreen_off() no longer call Fl_Window::hide() + Fl_Window::show()

The new procedure essentially resizes the window, as done on the X11+EWMH and Windows platforms.
This improves in particular the possibility to turn an Fl_Gl_Window fullscreen on and off.
MacOS ≥ 10.10 is required because the procedure isn't stable (random crashes during fast switches) with 10.9.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@13045 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

CHANGES

@@ -102,6 +102,9 @@ Changes in FLTK 1.4.0					Released: ??? ?? 2018
   Other Improvements
 
   - (add new items here)
+  - MacOS ≥ 10.10: Fl_Window::fullscreen() and fullscreen_off() no longer
+    proceed by Fl_Window::hide() + Fl_Window::show() but essentially
+    resize the window, as done on the X11+EWMH and Windows platforms.
   - Fl_Cairo_Window constructors are now compatible with Fl_Double_Window
     constructors - fixed missing constructors (STR #3160).
   - The include file for platform specific functions and definitions

examples/OpenGL3-glut-test.cxx

@@ -198,7 +198,6 @@ int main (int argc, char* argv[])
   glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | FL_OPENGL3);
   glutInitWindowSize(400, 400);
   glutCreateWindow("Triangle Test");
-  if (fullscreen) Fl::first_window()->fullscreen();
 #ifndef __APPLE__
   GLenum err = glewInit(); // defines pters to functions of OpenGL V 1.2 and above
   if (err) Fl::error("glewInit() failed returning %u", err);
@@ -215,6 +214,7 @@ int main (int argc, char* argv[])
   initShaders();
   init();
   glutDisplayFunc(display);
+  if (fullscreen) Fl::first_window()->fullscreen();
   glutMainLoop();
   return 0;
 }

src/Fl_cocoa.mm

@@ -3000,6 +3000,48 @@ Fl_X* Fl_Cocoa_Window_Driver::makeWindow()
   return x;
 }
 
+void Fl_Cocoa_Window_Driver::fullscreen_on() {
+  pWindow->_set_fullscreen();
+  if (fl_mac_os_version < 101000) {
+    // On OS X < 10.6, it is necessary to recreate the window. This is done with hide+show.
+    // The alternative procedure isn't stable until MacOS 10.10
+    pWindow->hide();
+    pWindow->show();
+  } else {
+    FLWindow *nswin = fl_xid(pWindow);
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
+    [nswin setStyleMask:NSBorderlessWindowMask]; //10.6
+#endif
+    [nswin setLevel:NSStatusWindowLevel];
+    int X,Y,W,H;
+    Fl::screen_xywh(X, Y, W, H, x(), y(), w(), h());
+    pWindow->resize(X, Y, W, H);
+  }
+  Fl::handle(FL_FULLSCREEN, pWindow);
+}
+
+void Fl_Cocoa_Window_Driver::fullscreen_off(int X, int Y, int W, int H) {
+  pWindow->_clear_fullscreen();
+  if (fl_mac_os_version < 101000) {
+    pWindow->hide();
+    pWindow->resize(X, Y, W, H);
+    pWindow->show();
+  } else {
+    FLWindow *nswin = fl_xid(pWindow);
+    NSUInteger winstyle = (pWindow->border() ?
+      (NSTitledWindowMask | NSClosableWindowMask | NSResizableWindowMask) : NSBorderlessWindowMask);
+    if (!pWindow->modal()) winstyle |= NSMiniaturizableWindowMask;
+    NSInteger level = NSNormalWindowLevel;
+    if (pWindow->modal()) level = modal_window_level();
+    else if (pWindow->non_modal()) level = non_modal_window_level();
+    [nswin setLevel:level];
+    pWindow->resize(X, Y, W, H);
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
+    [nswin setStyleMask:winstyle]; //10.6
+#endif
+  }
+  Fl::handle(FL_FULLSCREEN, pWindow);
+}
 
 /*
  * Tell the OS what window sizes we want to allow

src/drivers/Cocoa/Fl_Cocoa_Window_Driver.cxx

@@ -252,25 +252,6 @@ void Fl_Cocoa_Window_Driver::hide() {
 }
 
 
-void Fl_Cocoa_Window_Driver::fullscreen_on() {
-  pWindow->_set_fullscreen();
-  /* On OS X < 10.6, it is necessary to recreate the window. This is done
-   with hide+show. */
-  pWindow->hide();
-  pWindow->show();
-  Fl::handle(FL_FULLSCREEN, pWindow);
-}
-
-
-void Fl_Cocoa_Window_Driver::fullscreen_off(int X, int Y, int W, int H) {
-  pWindow->_clear_fullscreen();
-  pWindow->hide();
-  pWindow->resize(X, Y, W, H);
-  pWindow->show();
-  Fl::handle(FL_FULLSCREEN, pWindow);
-}
-
-
 void Fl_Cocoa_Window_Driver::decoration_sizes(int *top, int *left,  int *right, int *bottom) {
   *top = 24;
   *left = 2;