seat: store pressed keys in a vector

src/utils/vecset.rs

@@ -0,0 +1,39 @@
+use std::ops::Deref;
+
+pub struct VecSet<T> {
+    vec: Vec<T>,
+}
+
+impl<T> Default for VecSet<T> {
+    fn default() -> Self {
+        Self { vec: vec![] }
+    }
+}
+
+impl<T> Deref for VecSet<T> {
+    type Target = [T];
+
+    fn deref(&self) -> &Self::Target {
+        &self.vec
+    }
+}
+
+impl<T: PartialEq> VecSet<T> {
+    pub fn insert(&mut self, val: T) -> bool {
+        if self.vec.contains(&val) {
+            return false;
+        }
+        self.vec.push(val);
+        true
+    }
+
+    pub fn remove(&mut self, val: &T) -> bool {
+        for i in 0..self.vec.len() {
+            if self.vec[i] == *val {
+                self.vec.swap_remove(i);
+                return true;
+            }
+        }
+        false
+    }
+}