Implement IUnitHandler::notifyUnitSelection

src/plugin/bridges/vst3-impls/plugin-factory.h

@@ -28,8 +28,8 @@ class YaPluginFactoryImpl : public YaPluginFactory {
                                       void** obj) override;
     tresult PLUGIN_API setHostContext(Steinberg::FUnknown* context) override;
 
-    // The following pointers are cast from `host_context` if `setHostContext()`
-    // has been called
+    // The following pointers are cast from `host_context` if
+    // `IPluginFactory3::setHostContext()` has been called
 
     Steinberg::FUnknownPtr<Steinberg::Vst::IHostApplication> host_application;
 

src/plugin/bridges/vst3-impls/plugin-proxy.cpp

@@ -357,6 +357,10 @@ tresult PLUGIN_API Vst3PluginProxyImpl::setComponentHandler(
         // this component handler
         component_handler = handler;
 
+        // Automatically converted smart pointers for when the plugin performs a
+        // callback later
+        unit_handler = component_handler;
+
         return bridge.send_message(YaEditController::SetComponentHandler{
             .instance_id = instance_id(),
             .component_handler_proxy_args =

src/plugin/bridges/vst3-impls/plugin-proxy.h

@@ -152,11 +152,16 @@ class Vst3PluginProxyImpl : public Vst3PluginProxy {
      */
     Vst3PlugViewProxyImpl* last_created_plug_view = nullptr;
 
-    // The following pointers are cast from `host_context` if `setHostContext()`
-    // has been called
+    // The following pointers are cast from `host_context` if
+    // `IPluginBase::initialize()` has been called
 
     Steinberg::FUnknownPtr<Steinberg::Vst::IHostApplication> host_application;
 
+    // The following pointers are cast from `component_handler` if
+    // `IEditController::setComponentHandler()` has been called
+
+    Steinberg::FUnknownPtr<Steinberg::Vst::IUnitHandler> unit_handler;
+
    private:
     Vst3PluginBridge& bridge;
 

src/plugin/bridges/vst3.cpp

@@ -145,6 +145,12 @@ Vst3PluginBridge::Vst3PluginBridge()
                     return plug_view->plug_frame->resizeView(plug_view,
                                                              &request.new_size);
                 },
+                [&](const YaUnitHandler::NotifyUnitSelection& request)
+                    -> YaUnitHandler::NotifyUnitSelection::Response {
+                    return plugin_proxies.at(request.owner_instance_id)
+                        .get()
+                        .unit_handler->notifyUnitSelection(request.unit_id);
+                },
             });
     });
 }