1 files changed, 37 insertions, 0 deletions
diff --git a/packages/tui/input/mod.go b/packages/tui/input/mod.go
new file mode 100644
index 000000000..c00762769
--- /dev/null
+++ b/packages/tui/input/mod.go
@@ -0,0 +1,37 @@
+package input
+
+// KeyMod represents modifier keys.
+type KeyMod int
+
+// Modifier keys.
+const (
+	ModShift KeyMod = 1 << iota
+	ModAlt
+	ModCtrl
+	ModMeta
+
+	// These modifiers are used with the Kitty protocol.
+	// XXX: Meta and Super are swapped in the Kitty protocol,
+	// this is to preserve compatibility with XTerm modifiers.
+
+	ModHyper
+	ModSuper // Windows/Command keys
+
+	// These are key lock states.
+
+	ModCapsLock
+	ModNumLock
+	ModScrollLock // Defined in Windows API only
+)
+
+// Contains reports whether m contains the given modifiers.
+//
+// Example:
+//
+//	m := ModAlt | ModCtrl
+//	m.Contains(ModCtrl) // true
+//	m.Contains(ModAlt | ModCtrl) // true
+//	m.Contains(ModAlt | ModCtrl | ModShift) // false
+func (m KeyMod) Contains(mods KeyMod) bool {
+	return m&mods == mods
+}