Add NSEventMask::from_type

Available in the cococa crate, so we'll want it available as well.

Author: madsmtm

crates/objc2/src/topics/about_generated/CHANGELOG.md

@@ -14,6 +14,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Added
 * Added `IOKit` "serial" submodule.
+* Added various missing APIs.
 
 ## [0.3.1] - 2025-04-19
 [0.3.1]: https://github.com/madsmtm/objc2/compare/frameworks-0.3.0...frameworks-0.3.1

framework-crates/objc2-app-kit/src/event.rs

@@ -0,0 +1,8 @@
+use crate::{NSEventMask, NSEventType};
+
+impl NSEventMask {
+    #[doc(alias = "NSEventMaskFromType")]
+    pub fn from_type(ty: NSEventType) -> Self {
+        Self(1 << ty.0)
+    }
+}

framework-crates/objc2-app-kit/src/lib.rs

@@ -46,6 +46,8 @@ pub(crate) const TARGET_ABI_USES_IOS_VALUES: bool =
 
 #[cfg(feature = "NSApplication")]
 mod application;
+#[cfg(feature = "NSEvent")]
+mod event;
 mod generated;
 #[cfg(feature = "NSImage")]
 mod image;