Add bitmasks to Modifier enum

src/button.rs

@@ -3,16 +3,23 @@ use serde::{Deserialize, Serialize};
 
 use crate::keys::Key;
 
-#[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[repr(u8)]
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
 pub enum Modifier {
-    LShift,
-    LCtrl,
-    LAlt,
-    LMod,
-    RShift,
-    RCtrl,
-    RAlt,
-    RMod,
+    LCtrl = 0x01,
+    LShift = 0x02,
+    LAlt = 0x04,
+    LMod = 0x08,
+    RCtrl = 0x10,
+    RShift = 0x20,
+    RAlt = 0x40,
+    RMod = 0x80,
+}
+
+impl From<Modifier> for u8 {
+    fn from(modifier: Modifier) -> Self {
+        modifier as u8
+    }
 }
 
 #[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]