JUCE/modules/juce_audio_processors/utilities/juce_AudioProcessorParameterWithID.h

/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2022 - Raw Material Software Limited

   JUCE is an open source library subject to commercial or open-source
   licensing.

   By using JUCE, you agree to the terms of both the JUCE 7 End-User License
   Agreement and JUCE Privacy Policy.

   End User License Agreement: www.juce.com/juce-7-licence
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   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

/**
    Combines a parameter ID and a version hint.
*/
class ParameterID
{
public:
    ParameterID() = default;

    /** Constructs an instance.

        Note that this constructor implicitly converts from Strings and string-like types.

        @param identifier       A string that uniquely identifies a single parameter
        @param versionHint      Influences parameter ordering in Audio Unit plugins.
                                Used to provide backwards compatibility of Audio Unit plugins in
                                Logic and GarageBand.
                                @see AudioProcessorParameter(int)
    */
    template <typename StringLike, typename = DisableIfSameOrDerived<ParameterID, StringLike>>
    ParameterID (StringLike&& identifier, int versionHint = 0)
        : paramID (std::forward<StringLike> (identifier)), version (versionHint) {}

    /** @see AudioProcessorParameterWithID::paramID */
    auto getParamID()               const { return paramID; }

    /** @see AudioProcessorParameter(int) */
    auto getVersionHint()           const { return version; }

private:
    String paramID;
    int version = 0;
};

/**
    An instance of this class may be passed to the constructor of an AudioProcessorParameterWithID
    to set optional characteristics of that parameter.
*/
class AudioProcessorParameterWithIDAttributes
{
    using This = AudioProcessorParameterWithIDAttributes;

public:
    using Category = AudioProcessorParameter::Category;

    /** An optional label for the parameter's value */
    [[nodiscard]] auto withLabel (String x)            const { return withMember (*this, &This::label,          std::move (x)); }

    /** The semantics of this parameter */
    [[nodiscard]] auto withCategory (Category x)       const { return withMember (*this, &This::category,       std::move (x)); }

    /** @see AudioProcessorParameter::isMetaParameter() */
    [[nodiscard]] auto withMeta (bool x)               const { return withMember (*this, &This::meta,           std::move (x)); }

    /** @see AudioProcessorParameter::isAutomatable() */
    [[nodiscard]] auto withAutomatable (bool x)        const { return withMember (*this, &This::automatable,    std::move (x)); }

    /** @see AudioProcessorParameter::isOrientationInverted() */
    [[nodiscard]] auto withInverted (bool x)           const { return withMember (*this, &This::inverted,       std::move (x)); }

    /** An optional label for the parameter's value */
    [[nodiscard]] auto getLabel()                      const { return label; }

    /** The semantics of this parameter */
    [[nodiscard]] auto getCategory()                   const { return category; }

    /** @see AudioProcessorParameter::isMetaParameter() */
    [[nodiscard]] auto getMeta()                       const { return meta; }

    /** @see AudioProcessorParameter::isAutomatable() */
    [[nodiscard]] auto getAutomatable()                const { return automatable; }

    /** @see AudioProcessorParameter::isOrientationInverted() */
    [[nodiscard]] auto getInverted()                   const { return inverted; }

private:
    String label;
    Category category = AudioProcessorParameter::genericParameter;
    bool meta = false, automatable = true, inverted = false;
};

//==============================================================================
/**
    This abstract base class is used by some AudioProcessorParameter helper classes.

    @see AudioParameterFloat, AudioParameterInt, AudioParameterBool, AudioParameterChoice

    @tags{Audio}
*/
class JUCE_API  AudioProcessorParameterWithID  : public HostedAudioProcessorParameter
{
public:
    /** The creation of this object requires providing a name and ID which will be constant for its lifetime.

        Given that AudioProcessorParameterWithID is abstract, you'll probably call this constructor
        from a derived class constructor, e.g.
        @code
        MyParameterType (String paramID, String name, String label, bool automatable)
            : AudioProcessorParameterWithID (paramID, name, AudioProcessorParameterWithIDAttributes().withLabel (label)
                                                                                                     .withAutomatable (automatable))
        {
        }
        @endcode

        @param parameterID      Specifies the identifier, and optionally the parameter's version hint.
        @param parameterName    The user-facing parameter name.
        @param attributes       Other parameter properties.
    */
    AudioProcessorParameterWithID (const ParameterID& parameterID,
                                   const String& parameterName,
                                   const AudioProcessorParameterWithIDAttributes& attributes = {});

    /** The creation of this object requires providing a name and ID which will be
        constant for its lifetime.

        @param parameterID          Used to uniquely identify the parameter
        @param parameterName        The user-facing name of the parameter
        @param parameterLabel       An optional label for the parameter's value
        @param parameterCategory    The semantics of this parameter
    */
    [[deprecated ("Prefer the signature taking an Attributes argument")]]
    AudioProcessorParameterWithID (const ParameterID& parameterID,
                                   const String& parameterName,
                                   const String& parameterLabel,
                                   Category parameterCategory = AudioProcessorParameter::genericParameter)
        : AudioProcessorParameterWithID (parameterID,
                                         parameterName,
                                         AudioProcessorParameterWithIDAttributes().withLabel (parameterLabel)
                                                                                  .withCategory (parameterCategory))
    {
    }

    /** Provides access to the parameter's ID string. */
    const String paramID;

    /** Provides access to the parameter's name. */
    const String name;

    /** Provides access to the parameter's label. */
    const String label;

    /** Provides access to the parameter's category. */
    const Category category;

    String getName (int) const override;
    String getLabel() const override;
    Category getCategory() const override;

    String getParameterID()             const override { return paramID; }
    bool isMetaParameter()              const override { return meta; }
    bool isAutomatable()                const override { return automatable; }
    bool isOrientationInverted()        const override { return inverted; }

private:
    bool meta = false, automatable = true, inverted = false;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AudioProcessorParameterWithID)
};

} // namespace juce