Refactor macOS cursor code (#2463)

src/platform_impl/macos/appkit/cursor.rs

@@ -0,0 +1,241 @@
+use once_cell::sync::Lazy;
+
+use objc2::foundation::{NSData, NSDictionary, NSNumber, NSObject, NSPoint, NSString};
+use objc2::rc::{DefaultId, Id, Shared};
+use objc2::runtime::Sel;
+use objc2::{extern_class, extern_methods, msg_send_id, ns_string, ClassType};
+
+use super::NSImage;
+use crate::window::CursorIcon;
+
+extern_class!(
+    /// <https://developer.apple.com/documentation/appkit/nscursor?language=objc>
+    #[derive(Debug, PartialEq, Eq, Hash)]
+    pub(crate) struct NSCursor;
+
+    unsafe impl ClassType for NSCursor {
+        type Super = NSObject;
+    }
+);
+
+// SAFETY: NSCursor is immutable, stated here:
+// https://developer.apple.com/documentation/appkit/nscursor/1527062-image?language=objc
+unsafe impl Send for NSCursor {}
+unsafe impl Sync for NSCursor {}
+
+macro_rules! def_cursor {
+    {$(
+        $(#[$($m:meta)*])*
+        pub fn $name:ident();
+    )*} => {$(
+        $(#[$($m)*])*
+        pub fn $name() -> Id<Self, Shared> {
+            unsafe { msg_send_id![Self::class(), $name] }
+        }
+    )*};
+}
+
+macro_rules! def_undocumented_cursor {
+    {$(
+        $(#[$($m:meta)*])*
+        pub fn $name:ident();
+    )*} => {$(
+        $(#[$($m)*])*
+        pub fn $name() -> Id<Self, Shared> {
+            unsafe { Self::from_selector(sel!($name)).unwrap_or_else(|| Default::default()) }
+        }
+    )*};
+}
+
+extern_methods!(
+    /// Documented cursors
+    unsafe impl NSCursor {
+        def_cursor!(
+            pub fn arrowCursor();
+            pub fn pointingHandCursor();
+            pub fn openHandCursor();
+            pub fn closedHandCursor();
+            pub fn IBeamCursor();
+            pub fn IBeamCursorForVerticalLayout();
+            pub fn dragCopyCursor();
+            pub fn dragLinkCursor();
+            pub fn operationNotAllowedCursor();
+            pub fn contextualMenuCursor();
+            pub fn crosshairCursor();
+            pub fn resizeRightCursor();
+            pub fn resizeUpCursor();
+            pub fn resizeLeftCursor();
+            pub fn resizeDownCursor();
+            pub fn resizeLeftRightCursor();
+            pub fn resizeUpDownCursor();
+        );
+
+        // Creating cursors should be thread-safe, though using them for anything probably isn't.
+        pub fn new(image: &NSImage, hotSpot: NSPoint) -> Id<Self, Shared> {
+            let this = unsafe { msg_send_id![Self::class(), alloc] };
+            unsafe { msg_send_id![this, initWithImage: image, hotSpot: hotSpot] }
+        }
+
+        pub fn invisible() -> Id<Self, Shared> {
+            // 16x16 GIF data for invisible cursor
+            // You can reproduce this via ImageMagick.
+            // $ convert -size 16x16 xc:none cursor.gif
+            static CURSOR_BYTES: &[u8] = &[
+                0x47, 0x49, 0x46, 0x38, 0x39, 0x61, 0x10, 0x00, 0x10, 0x00, 0xF0, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x21, 0xF9, 0x04, 0x01, 0x00, 0x00, 0x00, 0x00, 0x2C,
+                0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x10, 0x00, 0x00, 0x02, 0x0E, 0x84, 0x8F, 0xA9,
+                0xCB, 0xED, 0x0F, 0xA3, 0x9C, 0xB4, 0xDA, 0x8B, 0xB3, 0x3E, 0x05, 0x00, 0x3B,
+            ];
+
+            static CURSOR: Lazy<Id<NSCursor, Shared>> = Lazy::new(|| {
+                // TODO: Consider using `dataWithBytesNoCopy:`
+                let data = NSData::with_bytes(CURSOR_BYTES);
+                let image = NSImage::new_with_data(&data);
+                NSCursor::new(&image, NSPoint::new(0.0, 0.0))
+            });
+
+            CURSOR.clone()
+        }
+    }
+
+    /// Undocumented cursors
+    unsafe impl NSCursor {
+        #[sel(respondsToSelector:)]
+        fn class_responds_to(sel: Sel) -> bool;
+
+        unsafe fn from_selector_unchecked(sel: Sel) -> Id<Self, Shared> {
+            unsafe { msg_send_id![Self::class(), performSelector: sel] }
+        }
+
+        unsafe fn from_selector(sel: Sel) -> Option<Id<Self, Shared>> {
+            if Self::class_responds_to(sel) {
+                Some(unsafe { Self::from_selector_unchecked(sel) })
+            } else {
+                warn!("Cursor `{:?}` appears to be invalid", sel);
+                None
+            }
+        }
+
+        def_undocumented_cursor!(
+            // Undocumented cursors: https://stackoverflow.com/a/46635398/5435443
+            pub fn _helpCursor();
+            pub fn _zoomInCursor();
+            pub fn _zoomOutCursor();
+            pub fn _windowResizeNorthEastCursor();
+            pub fn _windowResizeNorthWestCursor();
+            pub fn _windowResizeSouthEastCursor();
+            pub fn _windowResizeSouthWestCursor();
+            pub fn _windowResizeNorthEastSouthWestCursor();
+            pub fn _windowResizeNorthWestSouthEastCursor();
+
+            // While these two are available, the former just loads a white arrow,
+            // and the latter loads an ugly deflated beachball!
+            // pub fn _moveCursor();
+            // pub fn _waitCursor();
+
+            // An even more undocumented cursor...
+            // https://bugs.eclipse.org/bugs/show_bug.cgi?id=522349
+            pub fn busyButClickableCursor();
+        );
+    }
+
+    /// Webkit cursors
+    unsafe impl NSCursor {
+        // Note that loading `busybutclickable` with this code won't animate
+        // the frames; instead you'll just get them all in a column.
+        unsafe fn load_webkit_cursor(name: &NSString) -> Id<Self, Shared> {
+            // Snatch a cursor from WebKit; They fit the style of the native
+            // cursors, and will seem completely standard to macOS users.
+            //
+            // https://stackoverflow.com/a/21786835/5435443
+            let root = ns_string!("/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/Resources/cursors");
+            let cursor_path = root.join_path(name);
+
+            let pdf_path = cursor_path.join_path(ns_string!("cursor.pdf"));
+            let image = NSImage::new_by_referencing_file(&pdf_path);
+
+            // TODO: Handle PLists better
+            let info_path = cursor_path.join_path(ns_string!("info.plist"));
+            let info: Id<NSDictionary<NSObject, NSObject>, Shared> = unsafe {
+                msg_send_id![
+                    <NSDictionary<NSObject, NSObject>>::class(),
+                    dictionaryWithContentsOfFile: &*info_path,
+                ]
+            };
+            let mut x = 0.0;
+            if let Some(n) = info.get(&*ns_string!("hotx")) {
+                if n.is_kind_of::<NSNumber>() {
+                    let ptr: *const NSObject = n;
+                    let ptr: *const NSNumber = ptr.cast();
+                    x = unsafe { &*ptr }.as_cgfloat()
+                }
+            }
+            let mut y = 0.0;
+            if let Some(n) = info.get(&*ns_string!("hotx")) {
+                if n.is_kind_of::<NSNumber>() {
+                    let ptr: *const NSObject = n;
+                    let ptr: *const NSNumber = ptr.cast();
+                    y = unsafe { &*ptr }.as_cgfloat()
+                }
+            }
+
+            let hotspot = NSPoint::new(x, y);
+            Self::new(&image, hotspot)
+        }
+
+        pub fn moveCursor() -> Id<Self, Shared> {
+            unsafe { Self::load_webkit_cursor(ns_string!("move")) }
+        }
+
+        pub fn cellCursor() -> Id<Self, Shared> {
+            unsafe { Self::load_webkit_cursor(ns_string!("cell")) }
+        }
+    }
+);
+
+impl NSCursor {
+    pub fn from_icon(icon: CursorIcon) -> Id<Self, Shared> {
+        match icon {
+            CursorIcon::Default => Default::default(),
+            CursorIcon::Arrow => Self::arrowCursor(),
+            CursorIcon::Hand => Self::pointingHandCursor(),
+            CursorIcon::Grab => Self::openHandCursor(),
+            CursorIcon::Grabbing => Self::closedHandCursor(),
+            CursorIcon::Text => Self::IBeamCursor(),
+            CursorIcon::VerticalText => Self::IBeamCursorForVerticalLayout(),
+            CursorIcon::Copy => Self::dragCopyCursor(),
+            CursorIcon::Alias => Self::dragLinkCursor(),
+            CursorIcon::NotAllowed | CursorIcon::NoDrop => Self::operationNotAllowedCursor(),
+            CursorIcon::ContextMenu => Self::contextualMenuCursor(),
+            CursorIcon::Crosshair => Self::crosshairCursor(),
+            CursorIcon::EResize => Self::resizeRightCursor(),
+            CursorIcon::NResize => Self::resizeUpCursor(),
+            CursorIcon::WResize => Self::resizeLeftCursor(),
+            CursorIcon::SResize => Self::resizeDownCursor(),
+            CursorIcon::EwResize | CursorIcon::ColResize => Self::resizeLeftRightCursor(),
+            CursorIcon::NsResize | CursorIcon::RowResize => Self::resizeUpDownCursor(),
+            CursorIcon::Help => Self::_helpCursor(),
+            CursorIcon::ZoomIn => Self::_zoomInCursor(),
+            CursorIcon::ZoomOut => Self::_zoomOutCursor(),
+            CursorIcon::NeResize => Self::_windowResizeNorthEastCursor(),
+            CursorIcon::NwResize => Self::_windowResizeNorthWestCursor(),
+            CursorIcon::SeResize => Self::_windowResizeSouthEastCursor(),
+            CursorIcon::SwResize => Self::_windowResizeSouthWestCursor(),
+            CursorIcon::NeswResize => Self::_windowResizeNorthEastSouthWestCursor(),
+            CursorIcon::NwseResize => Self::_windowResizeNorthWestSouthEastCursor(),
+            // This is the wrong semantics for `Wait`, but it's the same as
+            // what's used in Safari and Chrome.
+            CursorIcon::Wait | CursorIcon::Progress => Self::busyButClickableCursor(),
+            CursorIcon::Move | CursorIcon::AllScroll => Self::moveCursor(),
+            CursorIcon::Cell => Self::cellCursor(),
+        }
+    }
+}
+
+impl DefaultId for NSCursor {
+    type Ownership = Shared;
+
+    fn default_id() -> Id<Self, Shared> {
+        Self::arrowCursor()
+    }
+}

src/platform_impl/macos/appkit/image.rs

@@ -0,0 +1,37 @@
+use objc2::foundation::{NSData, NSObject, NSString};
+use objc2::rc::{Id, Shared};
+use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+
+extern_class!(
+    // TODO: Can this be mutable?
+    #[derive(Debug, PartialEq, Eq, Hash)]
+    pub(crate) struct NSImage;
+
+    unsafe impl ClassType for NSImage {
+        type Super = NSObject;
+    }
+);
+
+// Documented Thread-Unsafe, but:
+// > One thread can create an NSImage object, draw to the image buffer,
+// > and pass it off to the main thread for drawing. The underlying image
+// > cache is shared among all threads.
+// <https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Multithreading/ThreadSafetySummary/ThreadSafetySummary.html#//apple_ref/doc/uid/10000057i-CH12-126728>
+//
+// So really only unsafe to mutate on several threads.
+unsafe impl Send for NSImage {}
+unsafe impl Sync for NSImage {}
+
+extern_methods!(
+    unsafe impl NSImage {
+        pub fn new_by_referencing_file(path: &NSString) -> Id<Self, Shared> {
+            let this = unsafe { msg_send_id![Self::class(), alloc] };
+            unsafe { msg_send_id![this, initByReferencingFile: path] }
+        }
+
+        pub fn new_with_data(data: &NSData) -> Id<Self, Shared> {
+            let this = unsafe { msg_send_id![Self::class(), alloc] };
+            unsafe { msg_send_id![this, initWithData: data] }
+        }
+    }
+);

src/platform_impl/macos/appkit/mod.rs

@@ -1,11 +1,18 @@
 #![deny(unsafe_op_in_unsafe_fn)]
+// Objective-C methods have different conventions, and it's much easier to
+// understand if we just use the same names
+#![allow(non_snake_case)]
 
 mod application;
+mod cursor;
+mod image;
 mod responder;
 mod view;
 mod window;
 
 pub(crate) use self::application::NSApplication;
+pub(crate) use self::cursor::NSCursor;
+pub(crate) use self::image::NSImage;
 pub(crate) use self::responder::NSResponder;
 pub(crate) use self::view::NSView;
 pub(crate) use self::window::NSWindow;

src/platform_impl/macos/appkit/view.rs

@@ -1,7 +1,7 @@
-use objc2::foundation::NSObject;
+use objc2::foundation::{NSObject, NSRect};
-use objc2::{extern_class, ClassType};
+use objc2::{extern_class, extern_methods, ClassType};
 
-use super::NSResponder;
+use super::{NSCursor, NSResponder};
 
 extern_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]
@@ -12,3 +12,17 @@ extern_class!(
         type Super = NSResponder;
     }
 );
+
+extern_methods!(
+    /// Getter methods
+    unsafe impl NSView {
+        #[sel(bounds)]
+        pub fn bounds(&self) -> NSRect;
+    }
+
+    unsafe impl NSView {
+        #[sel(addCursorRect:cursor:)]
+        // NSCursor safe to take by shared reference since it is already immutable
+        pub fn addCursorRect(&self, rect: NSRect, cursor: &NSCursor);
+    }
+);

src/platform_impl/macos/util/cursor.rs

@@ -1,165 +0,0 @@
-use cocoa::{
-    appkit::NSImage,
-    base::{id, nil},
-    foundation::{NSDictionary, NSPoint, NSString},
-};
-use objc::runtime::Sel;
-use std::cell::RefCell;
-
-use crate::window::CursorIcon;
-
-pub enum Cursor {
-    Native(&'static str),
-    Undocumented(&'static str),
-    WebKit(&'static str),
-}
-
-impl From<CursorIcon> for Cursor {
-    fn from(cursor: CursorIcon) -> Self {
-        // See native cursors at https://developer.apple.com/documentation/appkit/nscursor?language=objc.
-        match cursor {
-            CursorIcon::Arrow | CursorIcon::Default => Cursor::Native("arrowCursor"),
-            CursorIcon::Hand => Cursor::Native("pointingHandCursor"),
-            CursorIcon::Grab => Cursor::Native("openHandCursor"),
-            CursorIcon::Grabbing => Cursor::Native("closedHandCursor"),
-            CursorIcon::Text => Cursor::Native("IBeamCursor"),
-            CursorIcon::VerticalText => Cursor::Native("IBeamCursorForVerticalLayout"),
-            CursorIcon::Copy => Cursor::Native("dragCopyCursor"),
-            CursorIcon::Alias => Cursor::Native("dragLinkCursor"),
-            CursorIcon::NotAllowed | CursorIcon::NoDrop => {
-                Cursor::Native("operationNotAllowedCursor")
-            }
-            CursorIcon::ContextMenu => Cursor::Native("contextualMenuCursor"),
-            CursorIcon::Crosshair => Cursor::Native("crosshairCursor"),
-            CursorIcon::EResize => Cursor::Native("resizeRightCursor"),
-            CursorIcon::NResize => Cursor::Native("resizeUpCursor"),
-            CursorIcon::WResize => Cursor::Native("resizeLeftCursor"),
-            CursorIcon::SResize => Cursor::Native("resizeDownCursor"),
-            CursorIcon::EwResize | CursorIcon::ColResize => Cursor::Native("resizeLeftRightCursor"),
-            CursorIcon::NsResize | CursorIcon::RowResize => Cursor::Native("resizeUpDownCursor"),
-
-            // Undocumented cursors: https://stackoverflow.com/a/46635398/5435443
-            CursorIcon::Help => Cursor::Undocumented("_helpCursor"),
-            CursorIcon::ZoomIn => Cursor::Undocumented("_zoomInCursor"),
-            CursorIcon::ZoomOut => Cursor::Undocumented("_zoomOutCursor"),
-            CursorIcon::NeResize => Cursor::Undocumented("_windowResizeNorthEastCursor"),
-            CursorIcon::NwResize => Cursor::Undocumented("_windowResizeNorthWestCursor"),
-            CursorIcon::SeResize => Cursor::Undocumented("_windowResizeSouthEastCursor"),
-            CursorIcon::SwResize => Cursor::Undocumented("_windowResizeSouthWestCursor"),
-            CursorIcon::NeswResize => Cursor::Undocumented("_windowResizeNorthEastSouthWestCursor"),
-            CursorIcon::NwseResize => Cursor::Undocumented("_windowResizeNorthWestSouthEastCursor"),
-
-            // While these are available, the former just loads a white arrow,
-            // and the latter loads an ugly deflated beachball!
-            // CursorIcon::Move => Cursor::Undocumented("_moveCursor"),
-            // CursorIcon::Wait => Cursor::Undocumented("_waitCursor"),
-
-            // An even more undocumented cursor...
-            // https://bugs.eclipse.org/bugs/show_bug.cgi?id=522349
-            // This is the wrong semantics for `Wait`, but it's the same as
-            // what's used in Safari and Chrome.
-            CursorIcon::Wait | CursorIcon::Progress => {
-                Cursor::Undocumented("busyButClickableCursor")
-            }
-
-            // For the rest, we can just snatch the cursors from WebKit...
-            // They fit the style of the native cursors, and will seem
-            // completely standard to macOS users.
-            // https://stackoverflow.com/a/21786835/5435443
-            CursorIcon::Move | CursorIcon::AllScroll => Cursor::WebKit("move"),
-            CursorIcon::Cell => Cursor::WebKit("cell"),
-        }
-    }
-}
-
-impl Default for Cursor {
-    fn default() -> Self {
-        Cursor::Native("arrowCursor")
-    }
-}
-
-impl Cursor {
-    pub unsafe fn load(&self) -> id {
-        match self {
-            Cursor::Native(cursor_name) => {
-                let sel = Sel::register(cursor_name);
-                msg_send![class!(NSCursor), performSelector: sel]
-            }
-            Cursor::Undocumented(cursor_name) => {
-                let class = class!(NSCursor);
-                let sel = Sel::register(cursor_name);
-                let sel = if msg_send![class, respondsToSelector: sel] {
-                    sel
-                } else {
-                    warn!("Cursor `{}` appears to be invalid", cursor_name);
-                    sel!(arrowCursor)
-                };
-                msg_send![class, performSelector: sel]
-            }
-            Cursor::WebKit(cursor_name) => load_webkit_cursor(cursor_name),
-        }
-    }
-}
-
-// Note that loading `busybutclickable` with this code won't animate the frames;
-// instead you'll just get them all in a column.
-pub unsafe fn load_webkit_cursor(cursor_name: &str) -> id {
-    static CURSOR_ROOT: &str = "/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/Resources/cursors";
-    let cursor_root = NSString::alloc(nil).init_str(CURSOR_ROOT);
-    let cursor_name = NSString::alloc(nil).init_str(cursor_name);
-    let cursor_pdf = NSString::alloc(nil).init_str("cursor.pdf");
-    let cursor_plist = NSString::alloc(nil).init_str("info.plist");
-    let key_x = NSString::alloc(nil).init_str("hotx");
-    let key_y = NSString::alloc(nil).init_str("hoty");
-
-    let cursor_path: id = msg_send![cursor_root, stringByAppendingPathComponent: cursor_name];
-    let pdf_path: id = msg_send![cursor_path, stringByAppendingPathComponent: cursor_pdf];
-    let info_path: id = msg_send![cursor_path, stringByAppendingPathComponent: cursor_plist];
-
-    let image = NSImage::alloc(nil).initByReferencingFile_(pdf_path);
-    let info = NSDictionary::dictionaryWithContentsOfFile_(nil, info_path);
-    let x = info.valueForKey_(key_x);
-    let y = info.valueForKey_(key_y);
-    let point = NSPoint::new(msg_send![x, doubleValue], msg_send![y, doubleValue]);
-    let cursor: id = msg_send![class!(NSCursor), alloc];
-    msg_send![cursor,
-        initWithImage:image
-        hotSpot:point
-    ]
-}
-
-pub unsafe fn invisible_cursor() -> id {
-    // 16x16 GIF data for invisible cursor
-    // You can reproduce this via ImageMagick.
-    // $ convert -size 16x16 xc:none cursor.gif
-    static CURSOR_BYTES: &[u8] = &[
-        0x47, 0x49, 0x46, 0x38, 0x39, 0x61, 0x10, 0x00, 0x10, 0x00, 0xF0, 0x00, 0x00, 0x00, 0x00,
-        0x00, 0x00, 0x00, 0x00, 0x21, 0xF9, 0x04, 0x01, 0x00, 0x00, 0x00, 0x00, 0x2C, 0x00, 0x00,
-        0x00, 0x00, 0x10, 0x00, 0x10, 0x00, 0x00, 0x02, 0x0E, 0x84, 0x8F, 0xA9, 0xCB, 0xED, 0x0F,
-        0xA3, 0x9C, 0xB4, 0xDA, 0x8B, 0xB3, 0x3E, 0x05, 0x00, 0x3B,
-    ];
-
-    thread_local! {
-        // We can't initialize this at startup.
-        static CURSOR_OBJECT: RefCell<id> = RefCell::new(nil);
-    }
-
-    CURSOR_OBJECT.with(|cursor_obj| {
-        if *cursor_obj.borrow() == nil {
-            // Create a cursor from `CURSOR_BYTES`
-            let cursor_data: id = msg_send![
-                class!(NSData),
-                dataWithBytesNoCopy: CURSOR_BYTES.as_ptr(),
-                length: CURSOR_BYTES.len(),
-                freeWhenDone: false,
-            ];
-
-            let ns_image: id = msg_send![class!(NSImage), alloc];
-            let _: id = msg_send![ns_image, initWithData: cursor_data];
-            let cursor: id = msg_send![class!(NSCursor), alloc];
-            *cursor_obj.borrow_mut() =
-                msg_send![cursor, initWithImage:ns_image hotSpot: NSPoint::new(0.0, 0.0)];
-        }
-        *cursor_obj.borrow()
-    })
-}

src/platform_impl/macos/util/mod.rs

@@ -1,7 +1,6 @@
 mod r#async;
-mod cursor;
 
-pub use self::{cursor::*, r#async::*};
+pub use self::r#async::*;
 
 use std::ops::{BitAnd, Deref};
 use std::os::raw::c_uchar;

src/platform_impl/macos/view.rs

@@ -5,7 +5,7 @@ use std::{
     ptr, slice, str,
     sync::{
         atomic::{compiler_fence, Ordering},
-        Arc, Mutex, Weak,
+        Mutex,
     },
 };
 
@@ -15,10 +15,11 @@ use cocoa::{
     foundation::{NSPoint, NSRect, NSSize, NSString},
 };
 use objc2::foundation::{NSInteger, NSObject, NSRange, NSUInteger};
+use objc2::rc::{Id, Shared};
 use objc2::runtime::{Bool, Object, Sel};
 use objc2::{declare_class, ClassType};
 
-use super::appkit::{NSResponder, NSView as NSViewClass};
+use super::appkit::{NSCursor, NSResponder, NSView as NSViewClass};
 use crate::{
     dpi::{LogicalPosition, LogicalSize},
     event::{
@@ -41,7 +42,7 @@ use crate::{
 
 pub struct CursorState {
     pub visible: bool,
-    pub cursor: util::Cursor,
+    pub(super) cursor: Id<NSCursor, Shared>,
 }
 
 impl Default for CursorState {
@@ -70,7 +71,7 @@ enum ImeState {
 
 pub(super) struct ViewState {
     ns_window: id,
-    pub cursor_state: Arc<Mutex<CursorState>>,
+    pub cursor_state: Mutex<CursorState>,
     ime_position: LogicalPosition<f64>,
     pub(super) modifiers: ModifiersState,
     tracking_rect: Option<NSInteger>,
@@ -97,12 +98,10 @@ impl ViewState {
     }
 }
 
-pub fn new_view(ns_window: id) -> (IdRef, Weak<Mutex<CursorState>>) {
+pub fn new_view(ns_window: id) -> IdRef {
-    let cursor_state = Default::default();
-    let cursor_access = Arc::downgrade(&cursor_state);
     let state = ViewState {
         ns_window,
-        cursor_state,
+        cursor_state: Default::default(),
         ime_position: LogicalPosition::new(0.0, 0.0),
         modifiers: Default::default(),
         tracking_rect: None,
@@ -115,10 +114,7 @@ pub fn new_view(ns_window: id) -> (IdRef, Weak<Mutex<CursorState>>) {
         // This is free'd in `dealloc`
         let state_ptr = Box::into_raw(Box::new(state)) as *mut c_void;
         let ns_view: id = msg_send![WinitView::class(), alloc];
-        (
+        IdRef::new(msg_send![ns_view, initWithWinit: state_ptr])
-            IdRef::new(msg_send![ns_view, initWithWinit: state_ptr]),
-            cursor_access,
-        )
     }
 }
 
@@ -432,21 +428,17 @@ declare_class!(
         #[sel(resetCursorRects)]
         fn reset_cursor_rects(&self) {
             trace_scope!("resetCursorRects");
-            unsafe {
+            let state = unsafe {
                 let state_ptr: *mut c_void = *self.ivar("winitState");
-                let state = &mut *(state_ptr as *mut ViewState);
+                &mut *(state_ptr as *mut ViewState)
-
-                let bounds: NSRect = msg_send![self, bounds];
-                let cursor_state = state.cursor_state.lock().unwrap();
-                let cursor = if cursor_state.visible {
-                    cursor_state.cursor.load()
-                } else {
-                    util::invisible_cursor()
             };
-                let _: () = msg_send![self,
+
-                    addCursorRect:bounds
+            let bounds = self.bounds();
-                    cursor:cursor
+            let cursor_state = state.cursor_state.lock().unwrap();
-                ];
+            if cursor_state.visible {
+                self.addCursorRect(bounds, &cursor_state.cursor);
+            } else {
+                self.addCursorRect(bounds, &NSCursor::invisible());
             }
         }
     }

src/platform_impl/macos/window.rs

@@ -5,7 +5,7 @@ use std::{
     os::raw::c_void,
     sync::{
         atomic::{AtomicBool, Ordering},
-        Arc, Mutex, MutexGuard, Weak,
+        Arc, Mutex, MutexGuard,
     },
 };
 
@@ -26,8 +26,7 @@ use crate::{
         ffi,
         monitor::{self, MonitorHandle, VideoMode},
         util::{self, IdRef},
-        view::CursorState,
+        view::{self, new_view, ViewState},
-        view::{self, new_view},
         window_delegate::new_delegate,
         OsError,
     },
@@ -50,7 +49,7 @@ use objc2::rc::autoreleasepool;
 use objc2::runtime::{Bool, Object};
 use objc2::{declare_class, ClassType};
 
-use super::appkit::{NSResponder, NSWindow as NSWindowClass};
+use super::appkit::{NSCursor, NSResponder, NSWindow as NSWindowClass};
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct WindowId(pub usize);
@@ -112,8 +111,8 @@ impl Default for PlatformSpecificWindowBuilderAttributes {
 unsafe fn create_view(
     ns_window: id,
     pl_attribs: &PlatformSpecificWindowBuilderAttributes,
-) -> Option<(IdRef, Weak<Mutex<CursorState>>)> {
+) -> Option<IdRef> {
-    let (ns_view, cursor_state) = new_view(ns_window);
+    let ns_view = new_view(ns_window);
     ns_view.non_nil().map(|ns_view| {
         // The default value of `setWantsBestResolutionOpenGLSurface:` was `false` until
         // macos 10.14 and `true` after 10.15, we should set it to `YES` or `NO` to avoid
@@ -133,7 +132,7 @@ unsafe fn create_view(
             ns_view.setWantsLayer(Bool::YES.as_raw());
         }
 
-        (ns_view, cursor_state)
+        ns_view
     })
 }
 
@@ -375,7 +374,6 @@ pub struct UnownedWindow {
     pub ns_view: IdRef,   // never changes
     shared_state: Arc<Mutex<SharedState>>,
     decorations: AtomicBool,
-    cursor_state: Weak<Mutex<CursorState>>,
     pub inner_rect: Option<PhysicalSize<u32>>,
 }
 
@@ -395,7 +393,7 @@ impl UnownedWindow {
         let ns_window = create_window(&win_attribs, &pl_attribs)
             .ok_or_else(|| os_error!(OsError::CreationError("Couldn't create `NSWindow`")))?;
 
-        let (ns_view, cursor_state) = unsafe { create_view(*ns_window, &pl_attribs) }
+        let ns_view = unsafe { create_view(*ns_window, &pl_attribs) }
             .ok_or_else(|| os_error!(OsError::CreationError("Couldn't create `NSView`")))?;
 
         // Configure the new view as the "key view" for the window
@@ -448,7 +446,6 @@ impl UnownedWindow {
             ns_window,
             shared_state: Arc::new(Mutex::new(win_attribs.into())),
             decorations: AtomicBool::new(decorations),
-            cursor_state,
             inner_rect,
         });
 
@@ -616,14 +613,19 @@ impl UnownedWindow {
         unsafe { msg_send![*self.ns_window, isResizable] }
     }
 
-    pub fn set_cursor_icon(&self, cursor: CursorIcon) {
+    pub fn set_cursor_icon(&self, icon: CursorIcon) {
-        let cursor = util::Cursor::from(cursor);
+        let view_state: &ViewState = unsafe {
-        if let Some(cursor_access) = self.cursor_state.upgrade() {
+            let ns_view: &Object = (*self.ns_view).as_ref().expect("failed to deref");
-            cursor_access.lock().unwrap().cursor = cursor;
+            let state_ptr: *const c_void = *ns_view.ivar("winitState");
-        }
+            &*(state_ptr as *const ViewState)
+        };
+        let mut cursor_state = view_state.cursor_state.lock().unwrap();
+        cursor_state.cursor = NSCursor::from_icon(icon);
+        drop(cursor_state);
         unsafe {
-            let _: () = msg_send![*self.ns_window,
+            let _: () = msg_send![
-                invalidateCursorRectsForView:*self.ns_view
+                *self.ns_window,
+                invalidateCursorRectsForView: *self.ns_view,
             ];
         }
     }
@@ -645,8 +647,12 @@ impl UnownedWindow {
 
     #[inline]
     pub fn set_cursor_visible(&self, visible: bool) {
-        if let Some(cursor_access) = self.cursor_state.upgrade() {
+        let view_state: &ViewState = unsafe {
-            let mut cursor_state = cursor_access.lock().unwrap();
+            let ns_view: &Object = (*self.ns_view).as_ref().expect("failed to deref");
+            let state_ptr: *const c_void = *ns_view.ivar("winitState");
+            &*(state_ptr as *const ViewState)
+        };
+        let mut cursor_state = view_state.cursor_state.lock().unwrap();
         if visible != cursor_state.visible {
             cursor_state.visible = visible;
             drop(cursor_state);
@@ -657,7 +663,6 @@ impl UnownedWindow {
             }
         }
     }
-    }
 
     #[inline]
     pub fn scale_factor(&self) -> f64 {