Check only for partial match of modifier keys

1 files changed, 16 insertions, 1 deletions

diff --git a/core/src/keyboard/modifiers_state.rs b/core/src/keyboard/modifiers_state.rs
index 3058c065..0cfc6d69 100644
--- a/core/src/keyboard/modifiers_state.rs
+++ b/core/src/keyboard/modifiers_state.rs
@@ -1,5 +1,5 @@
 /// The current state of the keyboard modifiers.
-#[derive(Debug, Clone, Copy, PartialEq, Default)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
 pub struct ModifiersState {
     /// Whether a shift key is pressed
     pub shift: bool,
@@ -13,3 +13,18 @@ pub struct ModifiersState {
     /// Whether a logo key is pressed (e.g. windows key, command key...)
     pub logo: bool,
 }
+
+impl ModifiersState {
+    /// Returns true if the current [`ModifiersState`] has at least the same
+    /// modifiers enabled as the given value, and false otherwise.
+    ///
+    /// [`ModifiersState`]: struct.ModifiersState.html
+    pub fn matches(&self, modifiers: ModifiersState) -> bool {
+        let shift = !modifiers.shift || modifiers.shift && self.shift;
+        let control = !modifiers.control || modifiers.control && self.control;
+        let alt = !modifiers.alt || modifiers.alt && self.alt;
+        let logo = !modifiers.logo || modifiers.logo && self.logo;
+
+        shift && control && alt && logo
+    }
+}