JUCE/modules/juce_audio_processors/utilities/juce_AudioParameterInt.h

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

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

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

   For this technical preview, this file is not subject to commercial licensing.

   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
{

/**
    Provides a class of AudioProcessorParameter that can be used as an
    integer value with a given range.

    @see AudioParameterFloat, AudioParameterBool, AudioParameterChoice

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

        @param parameterID         The parameter ID to use
        @param parameterName       The parameter name to use
        @param minValue            The minimum parameter value
        @param maxValue            The maximum parameter value
        @param defaultValue        The default value
        @param parameterLabel      An optional label for the parameter's value
        @param stringFromInt       An optional lambda function that converts a int
                                   value to a string with a maximum length. This may
                                   be used by hosts to display the parameter's value.
        @param intFromString       An optional lambda function that parses a string
                                   and converts it into an int. Some hosts use this
                                   to allow users to type in parameter values.
    */
    AudioParameterInt (const String& parameterID, const String& parameterName,
                       int minValue, int maxValue,
                       int defaultValue,
                       const String& parameterLabel = String(),
                       std::function<String (int value, int maximumStringLength)> stringFromInt = nullptr,
                       std::function<int (const String& text)> intFromString = nullptr);

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

    /** Returns the parameter's current value as an integer. */
    int get() const noexcept                    { return roundToInt (value.load()); }

    /** Returns the parameter's current value as an integer. */
    operator int() const noexcept               { return get(); }

    /** Changes the parameter's current value to a new integer.
        The value passed in will be snapped to the permitted range before being used.
    */
    AudioParameterInt& operator= (int newValue);

    /** Returns the parameter's range. */
    Range<int> getRange() const noexcept        { return { (int) getNormalisableRange().start, (int) getNormalisableRange().end }; }

    /** 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 (int newValue);

private:
    //==============================================================================
    float getValue() const override;
    void setValue (float newValue) override;
    float getDefaultValue() const override;
    int getNumSteps() 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)> stringFromIntFunction;
    std::function<int (const String&)> intFromStringFunction;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (AudioParameterInt)
};

} // namespace juce