Create reorganization

1 files changed, 741 insertions, 0 deletions

diff --git a/src/api/cocoa/mod.rs b/src/api/cocoa/mod.rs
new file mode 100644
index 0000000..b9c566f
--- /dev/null
+++ b/src/api/cocoa/mod.rs
@@ -0,0 +1,741 @@
+#![cfg(target_os = "macos")]
+
+#[cfg(feature = "headless")]
+pub use self::headless::HeadlessContext;
+
+use {CreationError, Event, MouseCursor, CursorState};
+use CreationError::OsError;
+use libc;
+
+use Api;
+use BuilderAttribs;
+use GlRequest;
+use PixelFormat;
+use native_monitor::NativeMonitorId;
+
+use objc::runtime::{Class, Object, Sel, BOOL, YES, NO};
+use objc::declare::ClassDecl;
+
+use cocoa::base::{id, nil};
+use cocoa::foundation::{NSAutoreleasePool, NSDate, NSDefaultRunLoopMode, NSPoint, NSRect, NSSize, 
+                        NSString, NSUInteger}; 
+use cocoa::appkit;
+use cocoa::appkit::*;
+use cocoa::appkit::NSEventSubtype::*;
+
+use core_foundation::base::TCFType;
+use core_foundation::string::CFString;
+use core_foundation::bundle::{CFBundleGetBundleWithIdentifier, CFBundleGetFunctionPointerForName};
+
+use std::ffi::CStr;
+use std::collections::VecDeque;
+use std::str::FromStr;
+use std::str::from_utf8;
+use std::sync::Mutex;
+use std::ascii::AsciiExt;
+use std::ops::Deref;
+
+use events::Event::{Awakened, MouseInput, MouseMoved, ReceivedCharacter, KeyboardInput, MouseWheel, Closed};
+use events::ElementState::{Pressed, Released};
+use events::MouseButton;
+use events;
+
+pub use self::monitor::{MonitorID, get_available_monitors, get_primary_monitor};
+
+mod monitor;
+mod event;
+
+#[cfg(feature = "headless")]
+mod headless;
+
+static mut shift_pressed: bool = false;
+static mut ctrl_pressed: bool = false;
+static mut win_pressed: bool = false;
+static mut alt_pressed: bool = false;
+
+struct DelegateState {
+    is_closed: bool,
+    context: IdRef,
+    view: IdRef,
+    window: IdRef,
+    resize_handler: Option<fn(u32, u32)>,
+
+    /// Events that have been retreived with XLib but not dispatched with iterators yet
+    pending_events: Mutex<VecDeque<Event>>,
+}
+
+struct WindowDelegate {
+    state: Box<DelegateState>,
+    _this: IdRef,
+}
+
+impl WindowDelegate {
+    /// Get the delegate class, initiailizing it neccessary
+    fn class() -> *const Class {
+        use std::sync::{Once, ONCE_INIT};
+
+        extern fn window_should_close(this: &Object, _: Sel, _: id) -> BOOL {
+            unsafe {
+                let state: *mut libc::c_void = *this.get_ivar("glutinState");
+                let state = state as *mut DelegateState;
+                (*state).is_closed = true;
+
+                (*state).pending_events.lock().unwrap().push_back(Closed);
+            }
+            YES
+        }
+
+        extern fn window_did_resize(this: &Object, _: Sel, _: id) {
+            unsafe {
+                let state: *mut libc::c_void = *this.get_ivar("glutinState");
+                let state = &mut *(state as *mut DelegateState);
+
+                let _: () = msg_send![*state.context, update];
+
+                if let Some(handler) = state.resize_handler {
+                    let rect = NSView::frame(*state.view);
+                    let scale_factor = NSWindow::backingScaleFactor(*state.window) as f32;
+                    (handler)((scale_factor * rect.size.width as f32) as u32,
+                              (scale_factor * rect.size.height as f32) as u32);
+                }
+            }
+        }
+
+        static mut delegate_class: *const Class = 0 as *const Class;
+        static INIT: Once = ONCE_INIT;
+
+        INIT.call_once(|| unsafe {
+            // Create new NSWindowDelegate
+            let superclass = Class::get("NSObject").unwrap();
+            let mut decl = ClassDecl::new(superclass, "GlutinWindowDelegate").unwrap();
+
+            // Add callback methods
+            decl.add_method(sel!(windowShouldClose:),
+                window_should_close as extern fn(&Object, Sel, id) -> BOOL);
+            decl.add_method(sel!(windowDidResize:),
+                window_did_resize as extern fn(&Object, Sel, id));
+
+            // Store internal state as user data
+            decl.add_ivar::<*mut libc::c_void>("glutinState");
+
+            delegate_class = decl.register();
+        });
+
+        unsafe {
+            delegate_class
+        }
+    }
+
+    fn new(state: DelegateState) -> WindowDelegate {
+        // Box the state so we can give a pointer to it
+        let mut state = Box::new(state);
+        let state_ptr: *mut DelegateState = &mut *state;
+        unsafe {
+            let delegate = IdRef::new(msg_send![WindowDelegate::class(), new]);
+
+            (&mut **delegate).set_ivar("glutinState", state_ptr as *mut libc::c_void);
+            let _: () = msg_send![*state.window, setDelegate:*delegate];
+
+            WindowDelegate { state: state, _this: delegate }
+        }
+    }
+}
+
+impl Drop for WindowDelegate {
+    fn drop(&mut self) {
+        unsafe {
+            // Nil the window's delegate so it doesn't still reference us
+            let _: () = msg_send![*self.state.window, setDelegate:nil];
+        }
+    }
+}
+
+pub struct Window {
+    view: IdRef,
+    window: IdRef,
+    context: IdRef,
+    delegate: WindowDelegate,
+}
+
+#[cfg(feature = "window")]
+unsafe impl Send for Window {}
+#[cfg(feature = "window")]
+unsafe impl Sync for Window {}
+
+#[cfg(feature = "window")]
+#[derive(Clone)]
+pub struct WindowProxy;
+
+impl WindowProxy {
+    pub fn wakeup_event_loop(&self) {
+        unsafe {
+            let pool = NSAutoreleasePool::new(nil);
+            let event =
+                NSEvent::otherEventWithType_location_modifierFlags_timestamp_windowNumber_context_subtype_data1_data2_(
+                    nil, NSApplicationDefined, NSPoint::new(0.0, 0.0), NSEventModifierFlags::empty(),
+                    0.0, 0, nil, NSApplicationActivatedEventType, 0, 0);
+            NSApp().postEvent_atStart_(event, YES);
+            pool.drain();
+        }
+    }
+}
+
+pub struct PollEventsIterator<'a> {
+    window: &'a Window,
+}
+
+impl<'a> Iterator for PollEventsIterator<'a> {
+    type Item = Event;
+
+    fn next(&mut self) -> Option<Event> {
+        if let Some(ev) = self.window.delegate.state.pending_events.lock().unwrap().pop_front() {
+            return Some(ev);
+        }
+
+        unsafe {
+            let event = NSApp().nextEventMatchingMask_untilDate_inMode_dequeue_(
+                NSAnyEventMask.bits(),
+                NSDate::distantPast(nil),
+                NSDefaultRunLoopMode,
+                YES);
+            if event == nil { return None; }
+            NSApp().sendEvent_(event);
+
+            let event = match msg_send![event, type] {
+                NSLeftMouseDown         => { Some(MouseInput(Pressed, MouseButton::Left)) },
+                NSLeftMouseUp           => { Some(MouseInput(Released, MouseButton::Left)) },
+                NSRightMouseDown        => { Some(MouseInput(Pressed, MouseButton::Right)) },
+                NSRightMouseUp          => { Some(MouseInput(Released, MouseButton::Right)) },
+                NSMouseMoved            |
+                NSLeftMouseDragged      |
+                NSOtherMouseDragged     |
+                NSRightMouseDragged     => {
+                    let window_point = event.locationInWindow();
+                    let window: id = msg_send![event, window];
+                    let view_point = if window == nil {
+                        let window_rect = self.window.window.convertRectFromScreen_(NSRect::new(window_point, NSSize::new(0.0, 0.0)));
+                        self.window.view.convertPoint_fromView_(window_rect.origin, nil)
+                    } else {
+                        self.window.view.convertPoint_fromView_(window_point, nil)
+                    };
+                    let view_rect = NSView::frame(*self.window.view);
+                    let scale_factor = self.window.hidpi_factor();
+                    Some(MouseMoved(((scale_factor * view_point.x as f32) as i32,
+                                    (scale_factor * (view_rect.size.height - view_point.y) as f32) as i32)))
+                },
+                NSKeyDown               => {
+                    let mut events = VecDeque::new();
+                    let received_c_str = event.characters().UTF8String();
+                    let received_str = CStr::from_ptr(received_c_str);
+                    for received_char in from_utf8(received_str.to_bytes()).unwrap().chars() {
+                        if received_char.is_ascii() {
+                            events.push_back(ReceivedCharacter(received_char));
+                        }
+                    }
+
+                    let vkey =  event::vkeycode_to_element(NSEvent::keyCode(event));
+                    events.push_back(KeyboardInput(Pressed, NSEvent::keyCode(event) as u8, vkey));
+                    let event = events.pop_front();
+                    self.window.delegate.state.pending_events.lock().unwrap().extend(events.into_iter());
+                    event
+                },
+                NSKeyUp                 => {
+                    let vkey =  event::vkeycode_to_element(NSEvent::keyCode(event));
+                    Some(KeyboardInput(Released, NSEvent::keyCode(event) as u8, vkey))
+                },
+                NSFlagsChanged          => {
+                    let mut events = VecDeque::new();
+                    let shift_modifier = Window::modifier_event(event, appkit::NSShiftKeyMask, events::VirtualKeyCode::LShift, shift_pressed);
+                    if shift_modifier.is_some() {
+                        shift_pressed = !shift_pressed;
+                        events.push_back(shift_modifier.unwrap());
+                    }
+                    let ctrl_modifier = Window::modifier_event(event, appkit::NSControlKeyMask, events::VirtualKeyCode::LControl, ctrl_pressed);
+                    if ctrl_modifier.is_some() {
+                        ctrl_pressed = !ctrl_pressed;
+                        events.push_back(ctrl_modifier.unwrap());
+                    }
+                    let win_modifier = Window::modifier_event(event, appkit::NSCommandKeyMask, events::VirtualKeyCode::LWin, win_pressed);
+                    if win_modifier.is_some() {
+                        win_pressed = !win_pressed;
+                        events.push_back(win_modifier.unwrap());
+                    }
+                    let alt_modifier = Window::modifier_event(event, appkit::NSAlternateKeyMask, events::VirtualKeyCode::LAlt, alt_pressed);
+                    if alt_modifier.is_some() {
+                        alt_pressed = !alt_pressed;
+                        events.push_back(alt_modifier.unwrap());
+                    }
+                    let event = events.pop_front();
+                    self.window.delegate.state.pending_events.lock().unwrap().extend(events.into_iter());
+                    event
+                },
+                NSScrollWheel           => { Some(MouseWheel(event.scrollingDeltaY() as i32)) },
+                _                       => { None },
+            };
+
+
+
+            event
+        }
+    }
+}
+
+pub struct WaitEventsIterator<'a> {
+    window: &'a Window,
+}
+
+impl<'a> Iterator for WaitEventsIterator<'a> {
+    type Item = Event;
+
+    fn next(&mut self) -> Option<Event> {
+        loop {
+            if let Some(ev) = self.window.delegate.state.pending_events.lock().unwrap().pop_front() {
+                return Some(ev);
+            }
+
+            unsafe {
+                let event = NSApp().nextEventMatchingMask_untilDate_inMode_dequeue_(
+                    NSAnyEventMask.bits(),
+                    NSDate::distantFuture(nil),
+                    NSDefaultRunLoopMode,
+                    NO);
+            }
+
+            // calling poll_events()
+            if let Some(ev) = self.window.poll_events().next() {
+                return Some(ev);
+            } else {
+                return Some(Awakened);
+            }
+        }
+    }
+}
+
+impl Window {
+    #[cfg(feature = "window")]
+    pub fn new(builder: BuilderAttribs) -> Result<Window, CreationError> {
+        if builder.sharing.is_some() {
+            unimplemented!()
+        }
+
+        let app = match Window::create_app() {
+            Some(app) => app,
+            None      => { return Err(OsError(format!("Couldn't create NSApplication"))); },
+        };
+        let window = match Window::create_window(builder.dimensions.unwrap_or((800, 600)),
+                                                 &*builder.title,
+                                                 builder.monitor)
+        {
+            Some(window) => window,
+            None         => { return Err(OsError(format!("Couldn't create NSWindow"))); },
+        };
+        let view = match Window::create_view(*window) {
+            Some(view) => view,
+            None       => { return Err(OsError(format!("Couldn't create NSView"))); },
+        };
+
+        let context = match Window::create_context(*view, builder.vsync, builder.gl_version) {
+            Some(context) => context,
+            None          => { return Err(OsError(format!("Couldn't create OpenGL context"))); },
+        };
+
+        unsafe {
+            app.activateIgnoringOtherApps_(YES);
+            if builder.visible {
+                window.makeKeyAndOrderFront_(nil);
+            } else {
+                window.makeKeyWindow();
+            }
+        }
+
+        let ds = DelegateState {
+            is_closed: false,
+            context: context.clone(),
+            view: view.clone(),
+            window: window.clone(),
+            resize_handler: None,
+            pending_events: Mutex::new(VecDeque::new()),
+        };
+
+        let window = Window {
+            view: view,
+            window: window,
+            context: context,
+            delegate: WindowDelegate::new(ds),
+        };
+
+        Ok(window)
+    }
+
+    fn create_app() -> Option<id> {
+        unsafe {
+            let app = NSApp();
+            if app == nil {
+                None
+            } else {
+                app.setActivationPolicy_(NSApplicationActivationPolicyRegular);
+                app.finishLaunching();
+                Some(app)
+            }
+        }
+    }
+
+    fn create_window(dimensions: (u32, u32), title: &str, monitor: Option<MonitorID>) -> Option<IdRef> {
+        unsafe {
+            let screen = monitor.map(|monitor_id| {
+                let native_id = match monitor_id.get_native_identifier() {
+                    NativeMonitorId::Numeric(num) => num,
+                    _ => panic!("OS X monitors should always have a numeric native ID")
+                };
+                let matching_screen = {
+                    let screens = NSScreen::screens(nil);
+                    let count: NSUInteger = msg_send![screens, count];
+                    let key = IdRef::new(NSString::alloc(nil).init_str("NSScreenNumber"));
+                    let mut matching_screen: Option<id> = None;
+                    for i in (0..count) {
+                        let screen = msg_send![screens, objectAtIndex:i as NSUInteger];
+                        let device_description = NSScreen::deviceDescription(screen);
+                        let value: id = msg_send![device_description, objectForKey:*key];
+                        if value != nil {
+                            let screen_number: NSUInteger = msg_send![value, unsignedIntegerValue];
+                            if screen_number as u32 == native_id {
+                                matching_screen = Some(screen);
+                                break;
+                            }
+                        }
+                    }
+                    matching_screen
+                };
+                matching_screen.unwrap_or(NSScreen::mainScreen(nil))
+            });
+            let frame = match screen {
+                Some(screen) => NSScreen::frame(screen),
+                None => {
+                    let (width, height) = dimensions;
+                    NSRect::new(NSPoint::new(0., 0.), NSSize::new(width as f64, height as f64))
+                }
+            };
+
+            let masks = if screen.is_some() {
+                NSBorderlessWindowMask as NSUInteger
+            } else {
+                NSTitledWindowMask as NSUInteger |
+                NSClosableWindowMask as NSUInteger |
+                NSMiniaturizableWindowMask as NSUInteger |
+                NSResizableWindowMask as NSUInteger
+            };
+
+            let window = IdRef::new(NSWindow::alloc(nil).initWithContentRect_styleMask_backing_defer_(
+                frame,
+                masks,
+                NSBackingStoreBuffered,
+                NO,
+            ));
+            window.non_nil().map(|window| {
+                let title = IdRef::new(NSString::alloc(nil).init_str(title));
+                window.setTitle_(*title);
+                window.setAcceptsMouseMovedEvents_(YES);
+                if screen.is_some() {
+                    window.setLevel_(NSMainMenuWindowLevel as i64 + 1);
+                }
+                else {
+                    window.center();
+                }
+                window
+            })
+        }
+    }
+
+    fn create_view(window: id) -> Option<IdRef> {
+        unsafe {
+            let view = IdRef::new(NSView::alloc(nil).init());
+            view.non_nil().map(|view| {
+                view.setWantsBestResolutionOpenGLSurface_(YES);
+                window.setContentView_(*view);
+                view
+            })
+        }
+    }
+
+    fn create_context(view: id, vsync: bool, gl_version: GlRequest) -> Option<IdRef> {
+        let profile = match gl_version {
+            GlRequest::Latest => NSOpenGLProfileVersion4_1Core as u32,
+            GlRequest::Specific(Api::OpenGl, (1 ... 2, _)) => NSOpenGLProfileVersionLegacy as u32,
+            GlRequest::Specific(Api::OpenGl, (3, 0)) => NSOpenGLProfileVersionLegacy as u32,
+            GlRequest::Specific(Api::OpenGl, (3, 1 ... 2)) => NSOpenGLProfileVersion3_2Core as u32,
+            GlRequest::Specific(Api::OpenGl, _) => NSOpenGLProfileVersion4_1Core as u32,
+            GlRequest::Specific(_, _) => panic!("Only the OpenGL API is supported"),    // FIXME: return Result
+            GlRequest::GlThenGles { opengl_version: (1 ... 2, _), .. } => NSOpenGLProfileVersionLegacy as u32,
+            GlRequest::GlThenGles { opengl_version: (3, 0), .. } => NSOpenGLProfileVersionLegacy as u32,
+            GlRequest::GlThenGles { opengl_version: (3, 1 ... 2), .. } => NSOpenGLProfileVersion3_2Core as u32,
+            GlRequest::GlThenGles { .. } => NSOpenGLProfileVersion4_1Core as u32,
+        };
+        unsafe {
+            let attributes = [
+                NSOpenGLPFADoubleBuffer as u32,
+                NSOpenGLPFAClosestPolicy as u32,
+                NSOpenGLPFAColorSize as u32, 24,
+                NSOpenGLPFAAlphaSize as u32, 8,
+                NSOpenGLPFADepthSize as u32, 24,
+                NSOpenGLPFAStencilSize as u32, 8,
+                NSOpenGLPFAOpenGLProfile as u32, profile,
+                0
+            ];
+
+            let pixelformat = IdRef::new(NSOpenGLPixelFormat::alloc(nil).initWithAttributes_(&attributes));
+            pixelformat.non_nil().map(|pixelformat| {
+                let context = IdRef::new(NSOpenGLContext::alloc(nil).initWithFormat_shareContext_(*pixelformat, nil));
+                context.non_nil().map(|context| {
+                    context.setView_(view);
+                    if vsync {
+                        let value = 1;
+                        context.setValues_forParameter_(&value, NSOpenGLContextParameter::NSOpenGLCPSwapInterval);
+                    }
+                    context
+                })
+            }).unwrap_or(None)
+        }
+    }
+
+    pub fn is_closed(&self) -> bool {
+        self.delegate.state.is_closed
+    }
+
+    pub fn set_title(&self, title: &str) {
+        unsafe {
+            let title = IdRef::new(NSString::alloc(nil).init_str(title));
+            self.window.setTitle_(*title);
+        }
+    }
+
+    pub fn show(&self) {
+        unsafe { NSWindow::makeKeyAndOrderFront_(*self.window, nil); }
+    }
+
+    pub fn hide(&self) {
+        unsafe { NSWindow::orderOut_(*self.window, nil); }
+    }
+
+    pub fn get_position(&self) -> Option<(i32, i32)> {
+        unsafe {
+            let content_rect = NSWindow::contentRectForFrameRect_(*self.window, NSWindow::frame(*self.window));
+            // NOTE: coordinate system might be inconsistent with other backends
+            Some((content_rect.origin.x as i32, content_rect.origin.y as i32))
+        }
+    }
+
+    pub fn set_position(&self, x: i32, y: i32) {
+        unsafe {
+            // NOTE: coordinate system might be inconsistent with other backends
+            NSWindow::setFrameOrigin_(*self.window, NSPoint::new(x as f64, y as f64));
+        }
+    }
+
+    pub fn get_inner_size(&self) -> Option<(u32, u32)> {
+        unsafe {
+            let view_frame = NSView::frame(*self.view);
+            Some((view_frame.size.width as u32, view_frame.size.height as u32))
+        }
+    }
+
+    pub fn get_outer_size(&self) -> Option<(u32, u32)> {
+        unsafe {
+            let window_frame = NSWindow::frame(*self.window);
+            Some((window_frame.size.width as u32, window_frame.size.height as u32))
+        }
+    }
+
+    pub fn set_inner_size(&self, width: u32, height: u32) {
+        unsafe {
+            NSWindow::setContentSize_(*self.window, NSSize::new(width as f64, height as f64));
+        }
+    }
+
+    pub fn create_window_proxy(&self) -> WindowProxy {
+        WindowProxy
+    }
+
+    pub fn poll_events(&self) -> PollEventsIterator {
+        PollEventsIterator {
+            window: self
+        }
+    }
+
+    pub fn wait_events(&self) -> WaitEventsIterator {
+        WaitEventsIterator {
+            window: self
+        }
+    }
+
+    unsafe fn modifier_event(event: id, keymask: NSEventModifierFlags, key: events::VirtualKeyCode, key_pressed: bool) -> Option<Event> {
+        if !key_pressed && NSEvent::modifierFlags(event).contains(keymask) {
+            return Some(KeyboardInput(Pressed, NSEvent::keyCode(event) as u8, Some(key)));
+        } else if key_pressed && !NSEvent::modifierFlags(event).contains(keymask) {
+            return Some(KeyboardInput(Released, NSEvent::keyCode(event) as u8, Some(key)));
+        }
+
+        return None;
+    }
+
+    pub unsafe fn make_current(&self) {
+        let _: () = msg_send![*self.context, update];
+        self.context.makeCurrentContext();
+    }
+
+    pub fn is_current(&self) -> bool {
+        unsafe {
+            let current = NSOpenGLContext::currentContext(nil);
+            if current != nil {
+                let is_equal: BOOL = msg_send![current, isEqual:*self.context];
+                is_equal != NO
+            } else {
+                false
+            }
+        }
+    }
+
+    pub fn get_proc_address(&self, _addr: &str) -> *const () {
+        let symbol_name: CFString = FromStr::from_str(_addr).unwrap();
+        let framework_name: CFString = FromStr::from_str("com.apple.opengl").unwrap();
+        let framework = unsafe {
+            CFBundleGetBundleWithIdentifier(framework_name.as_concrete_TypeRef())
+        };
+        let symbol = unsafe {
+            CFBundleGetFunctionPointerForName(framework, symbol_name.as_concrete_TypeRef())
+        };
+        symbol as *const ()
+    }
+
+    pub fn swap_buffers(&self) {
+        unsafe { self.context.flushBuffer(); }
+    }
+
+    pub fn platform_display(&self) -> *mut libc::c_void {
+        unimplemented!()
+    }
+
+    pub fn platform_window(&self) -> *mut libc::c_void {
+        unimplemented!()
+    }
+
+    pub fn get_api(&self) -> ::Api {
+        ::Api::OpenGl
+    }
+
+    pub fn get_pixel_format(&self) -> PixelFormat {
+        unimplemented!();
+    }
+
+    pub fn set_window_resize_callback(&mut self, callback: Option<fn(u32, u32)>) {
+        self.delegate.state.resize_handler = callback;
+    }
+
+    pub fn set_cursor(&self, cursor: MouseCursor) {
+        let cursor_name = match cursor {                
+            MouseCursor::Arrow | MouseCursor::Default => "arrowCursor",
+            MouseCursor::Hand => "pointingHandCursor",
+            MouseCursor::Grabbing | MouseCursor::Grab => "closedHandCursor",
+            MouseCursor::Text => "IBeamCursor",
+            MouseCursor::VerticalText => "IBeamCursorForVerticalLayout",
+            MouseCursor::Copy => "dragCopyCursor",
+            MouseCursor::Alias => "dragLinkCursor",
+            MouseCursor::NotAllowed | MouseCursor::NoDrop => "operationNotAllowedCursor",
+            MouseCursor::ContextMenu => "contextualMenuCursor",
+            MouseCursor::Crosshair => "crosshairCursor",
+            MouseCursor::EResize => "resizeRightCursor",
+            MouseCursor::NResize => "resizeUpCursor",
+            MouseCursor::WResize => "resizeLeftCursor",
+            MouseCursor::SResize => "resizeDownCursor",
+            MouseCursor::EwResize | MouseCursor::ColResize => "resizeLeftRightCursor",
+            MouseCursor::NsResize | MouseCursor::RowResize => "resizeUpDownCursor",
+
+            /// TODO: Find appropriate OSX cursors
+            MouseCursor::NeResize | MouseCursor::NwResize |
+            MouseCursor::SeResize | MouseCursor::SwResize |
+            MouseCursor::NwseResize | MouseCursor::NeswResize |
+
+            MouseCursor::Cell | MouseCursor::NoneCursor |
+            MouseCursor::Wait | MouseCursor::Progress | MouseCursor::Help |
+            MouseCursor::Move | MouseCursor::AllScroll | MouseCursor::ZoomIn |
+            MouseCursor::ZoomOut => "arrowCursor",
+        };
+        let sel = Sel::register(cursor_name);
+        let cls = Class::get("NSCursor").unwrap();
+        unsafe {
+            use objc::MessageArguments;
+            let cursor: id = ().send(cls as *const _ as id, sel);
+            let _: () = msg_send![cursor, set];
+        }
+    }
+
+    pub fn set_cursor_state(&self, state: CursorState) -> Result<(), String> {
+        let cls = Class::get("NSCursor").unwrap();
+        match state {
+            CursorState::Normal => {
+                let _: () = unsafe { msg_send![cls, unhide] };
+                Ok(())
+            },
+            CursorState::Hide => {
+                let _: () = unsafe { msg_send![cls, hide] };
+                Ok(())
+            },
+            CursorState::Grab => {
+                Err("Mouse grabbing is unimplemented".to_string())
+            }
+        }
+    }
+
+    pub fn hidpi_factor(&self) -> f32 {
+        unsafe {
+            NSWindow::backingScaleFactor(*self.window) as f32
+        }
+    }
+
+    pub fn set_cursor_position(&self, x: i32, y: i32) -> Result<(), ()> {
+        unimplemented!();
+    }
+}
+
+struct IdRef(id);
+
+impl IdRef {
+    fn new(i: id) -> IdRef {
+        IdRef(i)
+    }
+
+    fn retain(i: id) -> IdRef {
+        if i != nil {
+            let _: id = unsafe { msg_send![i, retain] };
+        }
+        IdRef(i)
+    }
+
+    fn non_nil(self) -> Option<IdRef> {
+        if self.0 == nil { None } else { Some(self) }
+    }
+}
+
+impl Drop for IdRef {
+    fn drop(&mut self) {
+        if self.0 != nil {
+            let _: () = unsafe { msg_send![self.0, release] };
+        }
+    }
+}
+
+impl Deref for IdRef {
+    type Target = id;
+    fn deref<'a>(&'a self) -> &'a id {
+        &self.0
+    }
+}
+
+impl Clone for IdRef {
+    fn clone(&self) -> IdRef {
+        if self.0 != nil {
+            let _: id = unsafe { msg_send![self.0, retain] };
+        }
+        IdRef(self.0)
+    }
+}
+