Add an individual Editor::param_value_changed

nih_plug_egui/src/editor.rs

@@ -101,11 +101,15 @@ where
         true
     }
 
-    fn param_values_changed(&self) {
+    fn param_value_changed(&self, _id: &str, _normalized_value: f32) {
         // As mentioned above, for now we'll always force a redraw to allow meter widgets to work
         // correctly. In the future we can use an `Arc<AtomicBool>` and only force a redraw when
         // that boolean is set.
     }
+
+    fn param_values_changed(&self) {
+        // Same
+    }
 }
 
 /// The window handle used for [`EguiEditor`].

nih_plug_iced/src/editor.rs

@@ -101,12 +101,16 @@ impl<E: IcedEditor> Editor for IcedEditorWrapper<E> {
         true
     }
 
-    fn param_values_changed(&self) {
-        if self.iced_state.is_open() {
+    fn param_value_changed(&self, _id: &str, _normalized_value: f32) {
         // If there's already a paramter change notification in the channel then we don't need
         // to do anything else. This avoids queueing up redundant GUI redraws.
+        // NOTE: We could add an event containing the parameter's ID and the normalized value, but
+        //       these events aren't really necessary for Vizia.
         let _ = self.parameter_updates_sender.try_send(ParameterUpdate);
     }
+
+    fn param_values_changed(&self) {
+        let _ = self.parameter_updates_sender.try_send(ParameterUpdate);
     }
 }
 

nih_plug_vizia/src/editor.rs

@@ -123,8 +123,15 @@ impl Editor for ViziaEditor {
         true
     }
 
-    fn param_values_changed(&self) {
+    fn param_value_changed(&self, _id: &str, _normalized_value: f32) {
         // This will cause a future idle callback to send a parameters changed event.
+        // NOTE: We could add an event containing the parameter's ID and the normalized value, but
+        //       these events aren't really necessary for Vizia.
+        self.emit_parameters_changed_event
+            .store(true, Ordering::Relaxed);
+    }
+
+    fn param_values_changed(&self) {
         self.emit_parameters_changed_event
             .store(true, Ordering::Relaxed);
     }

src/editor.rs

@@ -53,13 +53,14 @@ pub trait Editor: Send {
     /// there.
     fn set_scale_factor(&self, factor: f32) -> bool;
 
-    /// A callback that will be called whenever the parameter values changed while the editor is
-    /// open. You don't need to do anything with this, but this can be used to force a redraw when
-    /// the host sends a new value for a parameter or when a parameter change sent to the host gets
-    /// processed.
-    ///
-    /// This function will be called from the **audio thread**. It must thus be lock-free and may
-    /// not allocate.
+    /// Called whenever a specific parameter's value has changed while the editor is open. You don't
+    /// need to do anything with this, but this can be used to force a redraw when the host sends a
+    /// new value for a parameter or when a parameter change sent to the host gets processed.
+    fn param_value_changed(&self, id: &str, normalized_value: f32);
+
+    /// Called whenever one or more parameter values changed while the editor is open. This may be
+    /// called in place of [`param_value_changed()`][Self::param_value_changed()] when multiple
+    /// parameter values hcange at the same time. For example, when a preset is loaded.
     fn param_values_changed(&self);
 
     // TODO: Reconsider adding a tick function here for the Linux `IRunLoop`. To keep this platform