Migrate from objc to objc2 (#99)

.changes/use-objc2.md

@@ -0,0 +1,5 @@
+---
+"global-hotkey": patch
+---
+
+Use `objc2` internally, leading to slightly better memory- and type-safety.

Cargo.toml

@@ -3,40 +3,39 @@ name = "global-hotkey"
 version = "0.6.0"
 description = "Global hotkeys for Desktop Applications"
 edition = "2021"
-keywords = [ "windowing", "global", "global-hotkey", "hotkey" ]
+keywords = ["windowing", "global", "global-hotkey", "hotkey"]
 license = "Apache-2.0 OR MIT"
 readme = "README.md"
 repository = "https://github.com/amrbashir/global-hotkey"
 documentation = "https://docs.rs/global-hotkey"
-categories = [ "gui" ]
+categories = ["gui"]
 
 [features]
-serde = [ "dep:serde" ]
+serde = ["dep:serde"]
 
 [dependencies]
 crossbeam-channel = "0.5"
 keyboard-types = "0.7"
 once_cell = "1"
 thiserror = "1"
-serde = { version = "1", optional = true, features = [ "derive" ] }
+serde = { version = "1", optional = true, features = ["derive"] }
 
-[target."cfg(target_os = \"macos\")".dependencies]
-bitflags = "2"
-cocoa = "0.26"
-objc = "0.2"
+[target.'cfg(target_os = "macos")'.dependencies]
+objc2 = "0.5.2"
+objc2-app-kit = { version = "0.2.2", features = ["NSEvent"] }
 
-[target."cfg(target_os = \"windows\")".dependencies.windows-sys]
+[target.'cfg(target_os = "windows")'.dependencies.windows-sys]
 version = "0.59"
 features = [
   "Win32_UI_WindowsAndMessaging",
   "Win32_Foundation",
   "Win32_System_SystemServices",
   "Win32_Graphics_Gdi",
   "Win32_UI_Shell",
-  "Win32_UI_Input_KeyboardAndMouse"
+  "Win32_UI_Input_KeyboardAndMouse",
 ]
 
-[target."cfg(any(target_os = \"linux\", target_os = \"dragonfly\", target_os = \"freebsd\", target_os = \"openbsd\", target_os = \"netbsd\"))".dependencies]
+[target.'cfg(any(target_os = "linux", target_os = "dragonfly", target_os = "freebsd", target_os = "openbsd", target_os = "netbsd"))'.dependencies]
 x11-dl = "2.21"
 
 [dev-dependencies]

src/platform_impl/macos/ffi.rs

@@ -7,6 +7,8 @@
 
 use std::ffi::{c_long, c_void};
 
+use objc2::encode::{Encode, Encoding, RefEncode};
+
 pub type UInt32 = ::std::os::raw::c_uint;
 pub type SInt32 = ::std::os::raw::c_int;
 pub type OSStatus = SInt32;
@@ -199,6 +201,10 @@ macro_rules! CGEventMaskBit {
 pub enum CGEvent {}
 pub type CGEventRef = *const CGEvent;
 
+unsafe impl RefEncode for CGEvent {
+    const ENCODING_REF: Encoding = Encoding::Pointer(&Encoding::Struct("__CGEvent", &[]));
+}
+
 pub type CGEventTapProxy = *const c_void;
 type CGEventTapCallBack = unsafe extern "C" fn(
     proxy: CGEventTapProxy,

src/platform_impl/macos/mod.rs

@@ -1,11 +1,6 @@
-use bitflags::bitflags;
-use cocoa::{
-    appkit::NSEventType,
-    base::id,
-    foundation::{NSInteger, NSUInteger},
-};
 use keyboard_types::{Code, Modifiers};
-use objc::{class, msg_send, sel, sel_impl};
+use objc2::{msg_send_id, rc::Retained, ClassType};
+use objc2_app_kit::{NSEvent, NSEventModifierFlags, NSEventSubtype, NSEventType};
 use std::{
     collections::{BTreeMap, HashSet},
     ffi::c_void,
@@ -255,35 +250,6 @@ impl GlobalHotKeyManager {
     }
 }
 
-bitflags! {
-    #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
-    struct NSEventModifierFlags: NSUInteger {
-        const Shift = 1 << 17;
-        const Control = 1 << 18;
-        const Option = 1 << 19;
-        const Command = 1 << 20;
-    }
-}
-
-impl From<NSEventModifierFlags> for Modifiers {
-    fn from(mod_flags: NSEventModifierFlags) -> Self {
-        let mut mods = Modifiers::empty();
-        if mod_flags.contains(NSEventModifierFlags::Shift) {
-            mods |= Modifiers::SHIFT;
-        }
-        if mod_flags.contains(NSEventModifierFlags::Control) {
-            mods |= Modifiers::CONTROL;
-        }
-        if mod_flags.contains(NSEventModifierFlags::Option) {
-            mods |= Modifiers::ALT;
-        }
-        if mod_flags.contains(NSEventModifierFlags::Command) {
-            mods |= Modifiers::META;
-        }
-        mods
-    }
-}
-
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
 #[allow(non_camel_case_types)]
 enum NX_KEYTYPE {
@@ -294,10 +260,10 @@ enum NX_KEYTYPE {
     Rewind = 20,
 }
 
-impl TryFrom<i64> for NX_KEYTYPE {
+impl TryFrom<isize> for NX_KEYTYPE {
     type Error = String;
 
-    fn try_from(value: i64) -> Result<Self, Self::Error> {
+    fn try_from(value: isize) -> Result<Self, Self::Error> {
         match value {
             16 => Ok(NX_KEYTYPE::Play),
             17 => Ok(NX_KEYTYPE::Next),
@@ -381,25 +347,37 @@ unsafe extern "C" fn media_key_event_callback(
         return event;
     }
 
-    let ns_event: id = msg_send![class!(NSEvent), eventWithCGEvent:event];
-    let event_type: NSEventType = msg_send![ns_event, type];
-    let event_subtype: u64 = msg_send![ns_event, subtype];
+    let ns_event: Retained<NSEvent> = msg_send_id![NSEvent::class(), eventWithCGEvent: event];
+    let event_type = ns_event.r#type();
+    let event_subtype = ns_event.subtype();
 
-    if event_type == NSEventType::NSSystemDefined && event_subtype == 8 {
+    if event_type == NSEventType::SystemDefined && event_subtype == NSEventSubtype::ScreenChanged {
         // Key
-        let data_1: NSInteger = msg_send![ns_event, data1];
+        let data_1 = ns_event.data1();
         let nx_keytype = NX_KEYTYPE::try_from((data_1 & 0xFFFF0000) >> 16);
         if nx_keytype.is_err() {
             return event;
         }
         let nx_keytype = nx_keytype.unwrap();
 
         // Modifiers
-        let mods: NSUInteger = msg_send![ns_event, modifierFlags];
-        let mods = NSEventModifierFlags::from_bits_truncate(mods);
+        let flags = ns_event.modifierFlags();
+        let mut mods = Modifiers::empty();
+        if flags.contains(NSEventModifierFlags::NSEventModifierFlagShift) {
+            mods |= Modifiers::SHIFT;
+        }
+        if flags.contains(NSEventModifierFlags::NSEventModifierFlagControl) {
+            mods |= Modifiers::CONTROL;
+        }
+        if flags.contains(NSEventModifierFlags::NSEventModifierFlagOption) {
+            mods |= Modifiers::ALT;
+        }
+        if flags.contains(NSEventModifierFlags::NSEventModifierFlagCommand) {
+            mods |= Modifiers::META;
+        }
 
         // Generate hotkey for matching
-        let hotkey = HotKey::new(Some(mods.into()), nx_keytype.into());
+        let hotkey = HotKey::new(Some(mods), nx_keytype.into());
 
         // Prevent Arc been releaded after callback returned
         let media_hotkeys = &*(user_info as *const Mutex<HashSet<HotKey>>);