StateManager.h

/***************************************************************************************************
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            fantastic  spatial  holophonic               synthesis    tool    kit
 
                                    copyright (c) fabian hummel
                                       www.github.com/fshstk
                                           www.fshstk.com
 
         this file is part of the fantastic spatial holophonic synthesis toolkit (fsh::stk)
  fsh::stk is free software: it is provided under the terms of the gnu general public license v3.0
                                    www.gnu.org/licenses/gpl-3.0
***************************************************************************************************/
 
#pragma once
#include <juce_audio_processors/juce_audio_processors.h>
#include <spdlog/spdlog.h>
 
namespace fsh::plugin
{
class StateManager : private juce::AudioProcessorValueTreeState
{
public:
  using SliderAttachment = juce::AudioProcessorValueTreeState::SliderAttachment;
 
  using ButtonAttachment = juce::AudioProcessorValueTreeState::ButtonAttachment;
 
  using Params = juce::AudioProcessorValueTreeState::ParameterLayout;
 
  StateManager(juce::AudioProcessor& parent, Params&& params);
 
  auto getState() -> juce::XmlElement;
 
  void setState(const juce::XmlElement& xml);
 
  auto getReferenceToBaseClass() -> juce::AudioProcessorValueTreeState&;
 
protected:
  template<typename T>
  auto getParameter(const juce::ParameterID& id) const -> T
  {
    const auto* const param = getRawParameterValue(id.getParamID());
 
    if (param == nullptr)
    {
      spdlog::critical("PluginStateBase: trying to access parameter '{}' which does not exist",
                       id.getParamID().toStdString());
      return {};
    }
 
    // This part is necessary since both casts from float to bool and float equality comparisons
    // (`param->load() == 0.0f`) trigger warnings in gcc:
    if constexpr (std::is_same<T, bool>::value)
      return juce::exactlyEqual(param->load(), 0.0f);
    else
      return static_cast<T>(param->load());
  }
};
} // namespace fsh::plugin