juce_AudioParameterChoice.h

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/*
  ==============================================================================
 
   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
   Privacy Policy: www.juce.com/juce-privacy-policy
 
   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
{

class AudioParameterChoiceAttributes : public RangedAudioParameterAttributes<AudioParameterChoiceAttributes, int> {};
 
//==============================================================================
class JUCE_API  AudioParameterChoice  : public RangedAudioParameter
{
public:
    AudioParameterChoice (const ParameterID& parameterID,
                          const String& parameterName,
                          const StringArray& choices,
                          int defaultItemIndex,
                          const AudioParameterChoiceAttributes& attributes = {});

    [[deprecated ("Prefer the signature taking an Attributes argument")]]
    AudioParameterChoice (const ParameterID& parameterID,
                          const String& parameterName,
                          const StringArray& choicesToUse,
                          int defaultItemIndex,
                          const String& parameterLabel,
                          std::function<String (int index, int maximumStringLength)> stringFromIndex = nullptr,
                          std::function<int (const String& text)> indexFromString = nullptr)
        : AudioParameterChoice (parameterID,
                                parameterName,
                                choicesToUse,
                                defaultItemIndex,
                                AudioParameterChoiceAttributes().withLabel (parameterLabel)
                                                                .withStringFromValueFunction (std::move (stringFromIndex))
                                                                .withValueFromStringFunction (std::move (indexFromString)))
    {
    }

    ~AudioParameterChoice() override;

    int getIndex() const noexcept                   { return roundToInt (value.load()); }

    operator int() const noexcept                   { return getIndex(); }

    String getCurrentChoiceName() const noexcept    { return choices[getIndex()]; }

    operator String() const noexcept                { return getCurrentChoiceName(); }

    AudioParameterChoice& operator= (int newValue);

    const NormalisableRange<float>& getNormalisableRange() const override   { return range; }

    const StringArray choices;
 
protected:
    virtual void valueChanged (int newValue);
 
private:
    //==============================================================================
    float getValue() const override;
    void setValue (float newValue) override;
    float getDefaultValue() const override;
    int getNumSteps() const override;
    bool isDiscrete() const override;
    String getText (float, int) const override;
    float getValueForText (const String&) const override;
 
    const NormalisableRange<float> range;
    std::atomic<float> value;
    const float defaultValue;
    std::function<String (int, int)> stringFromIndexFunction;
    std::function<int (const String&)> indexFromStringFunction;
 
    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AudioParameterChoice)
};
 
} // namespace juce