ComponentHandler.h

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  @file ComponentHandler.h
 
  @author Vitaly Sverchinsky
 
  @brief Part of Audacity VST3 module
 
**********************************************************************/
 
#pragma once
 
#include <memory>
#include <atomic>
#include <functional>
#include <pluginterfaces/vst/ivsteditcontroller.h>
 
namespace Steinberg
{
   namespace Vst
   {
      class IParameterChanges;
   }
}
 
namespace internal
{
   class ComponentHandler : public Steinberg::Vst::IComponentHandler
   {
      std::atomic<Steinberg::Vst::IParameterChanges*> mFirst { nullptr };
      std::atomic<Steinberg::Vst::IParameterChanges*> mSecond { nullptr };
      std::atomic<Steinberg::Vst::IParameterChanges*> mPendingChanges { nullptr };
 
   public:
      using PendingChangesPtr = std::unique_ptr<
         Steinberg::Vst::IParameterChanges,
         std::function<void (Steinberg::Vst::IParameterChanges*)>>;
 
      ComponentHandler();
      virtual ~ComponentHandler();
 
      Steinberg::tresult PLUGIN_API beginEdit(Steinberg::Vst::ParamID id) override;
 
      Steinberg::tresult PLUGIN_API performEdit(Steinberg::Vst::ParamID id, Steinberg::Vst::ParamValue valueNormalized) override;
 
      Steinberg::tresult PLUGIN_API endEdit(Steinberg::Vst::ParamID id) override;
 
      Steinberg::tresult PLUGIN_API restartComponent(Steinberg::int32 flags) override;
 
      PendingChangesPtr getPendingChanges();
 
 
      DECLARE_FUNKNOWN_METHODS
   };
}