feat(glfw): add setting key callback

1 files changed, 31 insertions, 0 deletions

diff --git a/glfw/src/util.rs b/glfw/src/util.rs
index f77aaf8..98dcb9b 100644
--- a/glfw/src/util.rs
+++ b/glfw/src/util.rs
@@ -8,3 +8,34 @@ pub fn is_main_thread() -> bool
 
     ttid == pid
 }
+
+macro_rules! enum_from_repr {
+    (
+        #[repr($repr: ident)]
+        $(#[$attr: meta])*
+        $visibility: vis enum $name: ident
+        {
+            $($variant: ident = $raw: path,)*
+        }
+    ) => {
+        $(#[$attr])*
+        #[repr($repr)]
+        $visibility enum $name
+        {
+            $($variant = $raw,)*
+        }
+
+        impl $name
+        {
+            fn from_repr(repr: $repr) -> Option<Self>
+            {
+                match repr {
+                    $($raw => Some(Self::$variant),)*
+                    _ => None
+                }
+            }
+        }
+    };
+}
+
+pub(crate) use enum_from_repr;