Add helpers for keyboard modifiers in vizia

nih_plug_vizia/src/widgets.rs

@@ -11,6 +11,8 @@ use std::sync::Arc;
 
 use vizia::{Context, Model};
 
+pub mod util;
+
 /// Register the default theme for the widgets exported by this module. This is automatically called
 /// for you when using [`create_vizia_editor()`][super::create_vizia_editor()].
 pub fn register_theme(cx: &mut Context) {

nih_plug_vizia/src/widgets/util.rs

@@ -0,0 +1,35 @@
+//! Utilities for writing VIZIA widgets.
+
+use vizia::Modifiers;
+
+/// An extension trait for [`Modifiers`] that adds platform-independent getters.
+pub trait ModifiersExt {
+    /// Returns true if the Command (on macOS) or Ctrl (on any other platform) key is pressed.
+    fn command(&self) -> bool;
+
+    /// Returns true if the Alt (or Option on macOS) key is pressed.
+    fn alt(&self) -> bool;
+
+    /// Returns true if the Shift key is pressed.
+    fn shift(&self) -> bool;
+}
+
+impl ModifiersExt for Modifiers {
+    fn command(&self) -> bool {
+        #[cfg(target_os = "macos")]
+        let result = self.contains(Modifiers::LOGO);
+
+        #[cfg(not(target_os = "macos"))]
+        let result = self.contains(Modifiers::CTRL);
+
+        result
+    }
+
+    fn alt(&self) -> bool {
+        self.contains(Modifiers::ALT)
+    }
+
+    fn shift(&self) -> bool {
+        self.contains(Modifiers::SHIFT)
+    }
+}