JUCE/modules/juce_audio_processors/utilities/juce_AudioParameterBool.cpp

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

   This file is part of the JUCE library.
   Copyright (c) 2017 - ROLI Ltd.

   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 5 End-User License
   Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
   27th April 2017).

   End User License Agreement: www.juce.com/juce-5-licence
   Privacy Policy: www.juce.com/juce-5-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
{

AudioParameterBool::AudioParameterBool (const String& idToUse, const String& nameToUse,
                                        bool def, const String& labelToUse,
                                        std::function<String(bool, int)> stringFromBool,
                                        std::function<bool(const String&)> boolFromString)
   : RangedAudioParameter (idToUse, nameToUse, labelToUse),
     value (def ? 1.0f : 0.0f),
     defaultValue (value),
     stringFromBoolFunction (stringFromBool),
     boolFromStringFunction (boolFromString)
{
    if (stringFromBoolFunction == nullptr)
        stringFromBoolFunction = [] (bool v, int) { return v ? TRANS("On") : TRANS("Off"); };

    if (boolFromStringFunction == nullptr)
    {
        StringArray onStrings;
        onStrings.add (TRANS("on"));
        onStrings.add (TRANS("yes"));
        onStrings.add (TRANS("true"));

        StringArray offStrings;
        offStrings.add (TRANS("off"));
        offStrings.add (TRANS("no"));
        offStrings.add (TRANS("false"));

        boolFromStringFunction = [onStrings, offStrings] (const String& text)
        {
            String lowercaseText (text.toLowerCase());

            for (auto& testText : onStrings)
                if (lowercaseText == testText)
                    return true;

            for (auto& testText : offStrings)
                if (lowercaseText == testText)
                    return false;

            return text.getIntValue() != 0;
        };
    }
}

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

float AudioParameterBool::getValue() const                               { return value; }
void AudioParameterBool::setValue (float newValue)                       { value = newValue; valueChanged (get()); }
float AudioParameterBool::getDefaultValue() const                        { return defaultValue; }
int AudioParameterBool::getNumSteps() const                              { return 2; }
bool AudioParameterBool::isDiscrete() const                              { return true; }
bool AudioParameterBool::isBoolean() const                               { return true; }
void AudioParameterBool::valueChanged (bool)                             {}

float AudioParameterBool::getValueForText (const String& text) const
{
    return boolFromStringFunction (text) ? 1.0f : 0.0f;
}

String AudioParameterBool::getText (float v, int maximumLength) const
{
    return stringFromBoolFunction (v >= 0.5f, maximumLength);
}

AudioParameterBool& AudioParameterBool::operator= (bool newValue)
{
    if (get() != newValue)
        setValueNotifyingHost (newValue ? 1.0f : 0.0f);

    return *this;
}

} // namespace juce