Carla/source/modules/juce_audio_processors/utilities/juce_AudioParameterBool.h

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

   This file is part of the JUCE 7 technical preview.
   Copyright (c) 2022 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For the technical preview this file cannot be licensed commercially.

   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
{

/** Properties of an AudioParameterBool.

    @see AudioParameterBool(), RangedAudioParameterAttributes()
*/
class AudioParameterBoolAttributes : public RangedAudioParameterAttributes<AudioParameterBoolAttributes, bool> {};

//==============================================================================
/**
    Provides a class of AudioProcessorParameter that can be used as a boolean value.

    @see AudioParameterFloat, AudioParameterInt, AudioParameterChoice

    @tags{Audio}
*/
class JUCE_API AudioParameterBool  : public RangedAudioParameter
{
public:
    /** Creates a AudioParameterBool with the specified parameters.

        Note that the attributes argument is optional and only needs to be
        supplied if you want to change options from their default values.

        Example usage:
        @code
        auto attributes = AudioParameterBoolAttributes().withStringFromValueFunction ([] (auto x, auto) { return x ? "On" : "Off"; })
                                                        .withLabel ("enabled");
        auto param = std::make_unique<AudioParameterBool> ("paramID", "Parameter Name", false, attributes);
        @endcode

        @param parameterID         The parameter ID to use
        @param parameterName       The parameter name to use
        @param defaultValue        The default value
        @param attributes          Optional characteristics
    */
    AudioParameterBool (const ParameterID& parameterID,
                        const String& parameterName,
                        bool defaultValue,
                        const AudioParameterBoolAttributes& attributes = {});

    /** Creates a AudioParameterBool with the specified parameters.

        @param parameterID         The parameter ID to use
        @param parameterName       The parameter name to use
        @param defaultValue        The default value
        @param parameterLabel      An optional label for the parameter's value
        @param stringFromBool      An optional lambda function that converts a bool
                                   value to a string with a maximum length. This may
                                   be used by hosts to display the parameter's value.
        @param boolFromString      An optional lambda function that parses a string and
                                   converts it into a bool value. Some hosts use this
                                   to allow users to type in parameter values.
    */
    [[deprecated ("Prefer the signature taking an Attributes argument")]]
    AudioParameterBool (const ParameterID& parameterID,
                        const String& parameterName,
                        bool defaultValue,
                        const String& parameterLabel,
                        std::function<String (bool value, int maximumStringLength)> stringFromBool = nullptr,
                        std::function<bool (const String& text)> boolFromString = nullptr)
        : AudioParameterBool (parameterID,
                              parameterName,
                              defaultValue,
                              AudioParameterBoolAttributes().withLabel (parameterLabel)
                                                            .withStringFromValueFunction (std::move (stringFromBool))
                                                            .withValueFromStringFunction (std::move (boolFromString)))
    {
    }

    /** Destructor. */
    ~AudioParameterBool() override;

    /** Returns the parameter's current boolean value. */
    bool get() const noexcept          { return value >= 0.5f; }

    /** Returns the parameter's current boolean value. */
    operator bool() const noexcept     { return get(); }

    /** Changes the parameter's current value to a new boolean. */
    AudioParameterBool& operator= (bool newValue);

    /** Returns the range of values that the parameter can take. */
    const NormalisableRange<float>& getNormalisableRange() const override   { return range; }

protected:
    /** Override this method if you are interested in receiving callbacks
        when the parameter value changes.
    */
    virtual void valueChanged (bool newValue);

private:
    //==============================================================================
    float getValue() const override;
    void setValue (float newValue) override;
    float getDefaultValue() const override;
    int getNumSteps() const override;
    bool isDiscrete() const override;
    bool isBoolean() const override;
    String getText (float, int) const override;
    float getValueForText (const String&) const override;

    const NormalisableRange<float> range { 0.0f, 1.0f, 1.0f };
    std::atomic<float> value;
    const float valueDefault;
    std::function<String (bool, int)> stringFromBoolFunction;
    std::function<bool (const String&)> boolFromStringFunction;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AudioParameterBool)
};

} // namespace juce