JUCE/modules/juce_audio_processors/utilities/juce_AudioParameterInt.cpp

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

   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
{

AudioParameterInt::AudioParameterInt (const String& idToUse, const String& nameToUse,
                                      int minValue, int maxValue, int def,
                                      const String& labelToUse,
                                      std::function<String (int, int)> stringFromInt,
                                      std::function<int (const String&)> intFromString)
   : RangedAudioParameter (idToUse, nameToUse, labelToUse),
     range ([minValue, maxValue]
            {
                NormalisableRange<float> rangeWithInterval { (float) minValue, (float) maxValue,
                                                             [](float start, float end, float v) { return jlimit (start, end, v * (end - start) + start); },
                                                             [](float start, float end, float v) { return jlimit (0.0f, 1.0f, (v - start) / (end - start)); },
                                                             [](float start, float end, float v) { return (float) roundToInt (juce::jlimit (start, end, v)); } };
                 rangeWithInterval.interval = 1.0f;
                 return rangeWithInterval;
            }()),
     value ((float) def),
     defaultValue (convertTo0to1 ((float) def)),
     stringFromIntFunction (stringFromInt),
     intFromStringFunction (intFromString)
{
    jassert (minValue < maxValue); // must have a non-zero range of values!

    if (stringFromIntFunction == nullptr)
        stringFromIntFunction = [] (int v, int) { return String (v); };

    if (intFromStringFunction == nullptr)
        intFromStringFunction = [] (const String& text) { return text.getIntValue(); };
}

AudioParameterInt::~AudioParameterInt()
{
    #if __cpp_lib_atomic_is_always_lock_free
     static_assert (std::atomic<float>::is_always_lock_free,
                    "AudioParameterInt requires a lock-free std::atomic<float>");
    #endif
}

float AudioParameterInt::getValue() const                                { return convertTo0to1 (value); }
void AudioParameterInt::setValue (float newValue)                        { value = convertFrom0to1 (newValue); valueChanged (get()); }
float AudioParameterInt::getDefaultValue() const                         { return defaultValue; }
int AudioParameterInt::getNumSteps() const                               { return ((int) getNormalisableRange().getRange().getLength()) + 1; }
float AudioParameterInt::getValueForText (const String& text) const      { return convertTo0to1 ((float) intFromStringFunction (text)); }
String AudioParameterInt::getText (float v, int length) const            { return stringFromIntFunction ((int) convertFrom0to1 (v), length); }
void AudioParameterInt::valueChanged (int)                               {}

AudioParameterInt& AudioParameterInt::operator= (int newValue)
{
    if (get() != newValue)
        setValueNotifyingHost (convertTo0to1 ((float) newValue));

    return *this;
}


//==============================================================================
//==============================================================================
#if JUCE_UNIT_TESTS

struct AudioParameterIntTests  : public UnitTest
{
    AudioParameterIntTests()
        : UnitTest ("AudioParameterInt", UnitTestCategories::audioProcessorParameters)
    {}

    void runTest() override
    {
        beginTest ("Three options switches at the correct points");
        {
            AudioParameterInt intParam ({}, {}, 1, 3, 1);

            intParam.setValueNotifyingHost (0.0f);
            expectEquals (intParam.get(), 1);

            intParam.setValueNotifyingHost (0.2f);
            expectEquals (intParam.get(), 1);

            intParam.setValueNotifyingHost (0.3f);
            expectEquals (intParam.get(), 2);

            intParam.setValueNotifyingHost (0.7f);
            expectEquals (intParam.get(), 2);

            intParam.setValueNotifyingHost (0.8f);
            expectEquals (intParam.get(), 3);

            intParam.setValueNotifyingHost (1.0f);
            expectEquals (intParam.get(), 3);
        }

        beginTest ("Out-of-bounds input");
        {
            AudioParameterInt intParam ({}, {}, -1, 2, 0);

            intParam.setValueNotifyingHost (-0.5f);
            expectEquals (intParam.get(), -1);

            intParam.setValueNotifyingHost (1.5f);
            expectEquals (intParam.get(), 2);

            intParam = -5;
            expectEquals (intParam.get(), -1);

            intParam = 5;
            expectEquals (intParam.get(), 2);
        }
    }
};

static AudioParameterIntTests audioParameterIntTests;

#endif

} // namespace juce