ndk/event: Implement SourceClass enum and provide Source::class()…

… getter

This `enum` was never `pub` even though it serves a slight purpose to
more easily classify various event sources, which is accounted for in
the bitmask-like value of `AINPUT_SOURCE_XXX`.

ndk/CHANGELOG.md

@@ -2,6 +2,7 @@
 
 - Move `MediaFormat` from `media::media_codec` to its own `media::media_format` module. (#442)
 - media_format: Expose `MediaFormat::copy()` and `MediaFormat::clear()` from API level 29. (#449)
+- event: Implement `SourceClass` enum and provide `Source::class()` getter. (#458)
 
 # 0.8.0 (2023-10-15)
 

ndk/src/event.rs

@@ -47,12 +47,20 @@ pub enum Source {
     Any = ffi::AINPUT_SOURCE_ANY,
 }
 
+impl Source {
+    pub fn class(self) -> SourceClass {
+        let class = u32::from(self) & ffi::AINPUT_SOURCE_CLASS_MASK;
+        // TODO: Don't use None
+        class.try_into().unwrap_or(SourceClass::None)
+    }
+}
+
 /// An enum representing the class of an [`InputEvent`] source.
 ///
 /// See [the NDK docs](https://developer.android.com/ndk/reference/group/input#anonymous-enum-35)
 #[derive(Debug, Clone, Copy, PartialEq, Eq, TryFromPrimitive, IntoPrimitive)]
 #[repr(u32)]
-enum Class {
+pub enum SourceClass {
     None = ffi::AINPUT_SOURCE_CLASS_NONE,
     Button = ffi::AINPUT_SOURCE_CLASS_BUTTON,
     Pointer = ffi::AINPUT_SOURCE_CLASS_POINTER,