keyboard: move KeyboardState to dedicated module

src/keyboard.rs

@@ -0,0 +1,37 @@
+use {
+    crate::utils::vecset::VecSet,
+    std::{
+        cell::{Ref, RefCell},
+        rc::Rc,
+    },
+    uapi::OwnedFd,
+};
+
+#[derive(Copy, Clone, Debug, Default)]
+pub struct ModifierState {
+    pub mods_depressed: u32,
+    pub mods_latched: u32,
+    pub mods_locked: u32,
+    pub mods_effective: u32,
+    pub group: u32,
+}
+
+linear_ids!(KeyboardStateIds, KeyboardStateId, u64);
+
+pub struct KeyboardState {
+    pub id: KeyboardStateId,
+    pub map: Rc<OwnedFd>,
+    pub map_len: usize,
+    pub pressed_keys: VecSet<u32>,
+    pub mods: ModifierState,
+}
+
+pub trait DynKeyboardState {
+    fn borrow(&self) -> Ref<'_, KeyboardState>;
+}
+
+impl DynKeyboardState for RefCell<KeyboardState> {
+    fn borrow(&self) -> Ref<'_, KeyboardState> {
+        self.borrow()
+    }
+}