feat(engine): add Keyboard::new_key_states fn

1 files changed, 13 insertions, 0 deletions

diff --git a/engine/src/windowing/keyboard.rs b/engine/src/windowing/keyboard.rs
index 0bb70a7..5a31e7c 100644
--- a/engine/src/windowing/keyboard.rs
+++ b/engine/src/windowing/keyboard.rs
@@ -38,6 +38,19 @@ impl Keyboard
         self.get_key_state(key) == KeyState::Released
     }
 
+    /// Returns a iterator of key & key state pairs where each of the keys have a
+    /// different state than they had the previous frame.
+    pub fn new_key_states(&self) -> impl Iterator<Item = (Key, KeyState)> + use<'_>
+    {
+        self.map.iter().filter_map(|(key, key_data)| {
+            if key_data.curr_state == key_data.previous_state {
+                return None;
+            }
+
+            Some((*key, key_data.curr_state))
+        })
+    }
+
     #[must_use]
     pub fn get_key_state(&self, key: Key) -> KeyState
     {