juce::AudioParameterChoice Class Reference

#include <juce_AudioParameterChoice.h>

Inheritance diagram for juce::AudioParameterChoice:

Public Member Functions
	AudioParameterChoice (const ParameterID &parameterID, const String &parameterName, const StringArray &choices, int defaultItemIndex, const AudioParameterChoiceAttributes &attributes={})
	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 () override
int	getIndex () const noexcept
	operator int () const noexcept
String	getCurrentChoiceName () const noexcept
	operator String () const noexcept
AudioParameterChoice &	operator= (int newValue)
const NormalisableRange< float > &	getNormalisableRange () const override
Public Member Functions inherited from juce::RangedAudioParameter
int	getNumSteps () const override
float	convertTo0to1 (float v) const noexcept
float	convertFrom0to1 (float v) const noexcept
	AudioProcessorParameterWithID (const ParameterID &parameterID, const String &parameterName, const AudioProcessorParameterWithIDAttributes &attributes={})
	AudioProcessorParameterWithID (const ParameterID &parameterID, const String &parameterName, const String &parameterLabel, Category parameterCategory=AudioProcessorParameter::genericParameter)
Public Member Functions inherited from juce::AudioProcessorParameterWithID
	AudioProcessorParameterWithID (const ParameterID &parameterID, const String &parameterName, const AudioProcessorParameterWithIDAttributes &attributes={})
	AudioProcessorParameterWithID (const ParameterID &parameterID, const String &parameterName, const String &parameterLabel, Category parameterCategory=AudioProcessorParameter::genericParameter)
String	getName (int) const override
String	getLabel () const override
Category	getCategory () const override
String	getParameterID () const override
bool	isMetaParameter () const override
bool	isAutomatable () const override
bool	isOrientationInverted () const override
Public Member Functions inherited from juce::HostedAudioProcessorParameter
	AudioProcessorParameter () noexcept=default
	AudioProcessorParameter (int versionHint)
Public Member Functions inherited from juce::AudioProcessorParameter
	AudioProcessorParameter () noexcept=default
	AudioProcessorParameter (int versionHint)
virtual	~AudioProcessorParameter ()
void	setValueNotifyingHost (float newValue)
void	beginChangeGesture ()
void	endChangeGesture ()
virtual bool	isBoolean () const
int	getParameterIndex () const noexcept
virtual String	getCurrentValueAsText () const
virtual StringArray	getAllValueStrings () const
int	getVersionHint () const
void	addListener (Listener *newListener)
void	removeListener (Listener *listener)
void	sendValueChangedMessageToListeners (float newValue)

Public Attributes
const StringArray	choices
Public Attributes inherited from juce::AudioProcessorParameterWithID
const String	paramID
const String	name
const String	label
const Category	category

Protected Member Functions
virtual void	valueChanged (int newValue)

Private Member Functions
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

Private Attributes
const NormalisableRange< float >	range
std::atomic< float >	value
const float	defaultValue
std::function< String(int, int)>	stringFromIndexFunction
std::function< int(const String &)>	indexFromStringFunction

Additional Inherited Members
Public Types inherited from juce::AudioProcessorParameter
enum	Category {   genericParameter = (0 << 16) | 0 , inputGain = (1 << 16) | 0 , outputGain = (1 << 16) | 1 , inputMeter = (2 << 16) | 0 ,   outputMeter = (2 << 16) | 1 , compressorLimiterGainReductionMeter = (2 << 16) | 2 , expanderGateGainReductionMeter = (2 << 16) | 3 , analysisMeter = (2 << 16) | 4 ,   otherMeter = (2 << 16) | 5 }

Detailed Description

Provides a class of AudioProcessorParameter that can be used to select an indexed, named choice from a list.

See also

AudioParameterFloat, AudioParameterInt, AudioParameterBool

@tags{Audio}

Constructor & Destructor Documentation

AudioParameterChoice() [1/2]

juce::AudioParameterChoice::AudioParameterChoice	(	const ParameterID &	parameterID,
		const String &	parameterName,
		const StringArray &	choices,
		int	defaultItemIndex,
		const AudioParameterChoiceAttributes &	attributes = {} )

Creates a AudioParameterChoice 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:

auto attributes = AudioParameterChoiceAttributes().withLabel ("selected");
auto param = std::make_unique<AudioParameterChoice> ("paramID", "Parameter Name", StringArray { "a", "b", "c" }, 0, attributes);

Parameters

parameterID	The parameter ID to use
parameterName	The parameter name to use
choices	The set of choices to use
defaultItemIndex	The index of the default choice
Attributes	Optional characteristics

AudioParameterChoice() [2/2]

juce::AudioParameterChoice::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 )

inline

Creates a AudioParameterChoice with the specified parameters.

Parameters

parameterID	The parameter ID to use
parameterName	The parameter name to use
choicesToUse	The set of choices to use
defaultItemIndex	The index of the default choice
parameterLabel	An optional label for the parameter's value
stringFromIndex	An optional lambda function that converts a choice index to a string with a maximum length. This may be used by hosts to display the parameter's value.
indexFromString	An optional lambda function that parses a string and converts it into a choice index. Some hosts use this to allow users to type in parameter values.

~AudioParameterChoice()

juce::AudioParameterChoice::~AudioParameterChoice ( )

override

Destructor.

Member Function Documentation

getCurrentChoiceName()

String juce::AudioParameterChoice::getCurrentChoiceName ( ) const

inlinenoexcept

Returns the name of the currently selected item.

getDefaultValue()

float juce::AudioParameterChoice::getDefaultValue ( ) const

overrideprivatevirtual

This should return the default value for this parameter.

Implements juce::AudioProcessorParameter.

getIndex()

int juce::AudioParameterChoice::getIndex ( ) const

inlinenoexcept

Returns the current index of the selected item.

getNormalisableRange()

const NormalisableRange< float > & juce::AudioParameterChoice::getNormalisableRange ( ) const

inlineoverridevirtual

Returns the range of values that the parameter can take.

Implements juce::RangedAudioParameter.

getNumSteps()

int juce::AudioParameterChoice::getNumSteps ( ) const

overrideprivatevirtual

Returns the number of steps that this parameter's range should be quantised into.

If you want a continuous range of values, don't override this method, and allow the default implementation to return AudioProcessor::getDefaultNumParameterSteps().

If your parameter is boolean, then you may want to make this return 2.

The value that is returned may or may not be used, depending on the host. If you want the host to display stepped automation values, rather than a continuous interpolation between successive values, you should override isDiscrete to return true.

See also

isDiscrete

Reimplemented from juce::AudioProcessorParameter.

getText()

String juce::AudioParameterChoice::getText ( float normalisedValue, int  ) const

overrideprivatevirtual

Returns a textual version of the supplied normalised parameter value. The default implementation just returns the floating point value as a string, but this could do anything you need for a custom type of value.

Reimplemented from juce::AudioProcessorParameter.

getValue()

float juce::AudioParameterChoice::getValue ( ) const

overrideprivatevirtual

Called by the host to find out the value of this parameter.

Hosts will expect the value returned to be between 0 and 1.0.

This could be called quite frequently, so try to make your code efficient. It's also likely to be called by non-UI threads, so the code in here should be thread-aware.

Implements juce::AudioProcessorParameter.

getValueForText()

float juce::AudioParameterChoice::getValueForText ( const String & text ) const

overrideprivatevirtual

Should parse a string and return the appropriate value for it.

Implements juce::AudioProcessorParameter.

isDiscrete()

bool juce::AudioParameterChoice::isDiscrete ( ) const

overrideprivatevirtual

Returns whether the parameter uses discrete values, based on the result of getNumSteps, or allows the host to select values continuously.

This information may or may not be used, depending on the host. If you want the host to display stepped automation values, rather than a continuous interpolation between successive values, override this method to return true.

See also

getNumSteps

Reimplemented from juce::AudioProcessorParameter.

operator int()

juce::AudioParameterChoice::operator int ( ) const

inlinenoexcept

Returns the current index of the selected item.

operator String()

juce::AudioParameterChoice::operator String ( ) const

inlinenoexcept

Returns the name of the currently selected item.

operator=()

AudioParameterChoice & juce::AudioParameterChoice::operator=

(

int

newValue

)

Changes the selected item to a new index.

setValue()

void juce::AudioParameterChoice::setValue ( float newValue )

overrideprivatevirtual

The host will call this method to change the value of a parameter.

The host may call this at any time, including during the audio processing callback, so your implementation has to process this very efficiently and avoid any kind of locking.

If you want to set the value of a parameter internally, e.g. from your editor component, then don't call this directly - instead, use the setValueNotifyingHost() method, which will also send a message to the host telling it about the change. If the message isn't sent, the host won't be able to automate your parameters properly.

The value passed will be between 0 and 1.0.

Implements juce::AudioProcessorParameter.

valueChanged()

void juce::AudioParameterChoice::valueChanged ( int newValue )

protectedvirtual

Override this method if you are interested in receiving callbacks when the parameter value changes.

Member Data Documentation

choices

const StringArray juce::AudioParameterChoice::choices

Provides access to the list of choices that this parameter is working with.

defaultValue

const float juce::AudioParameterChoice::defaultValue

private

indexFromStringFunction

std::function<int (const String&)> juce::AudioParameterChoice::indexFromStringFunction

private

range

const NormalisableRange<float> juce::AudioParameterChoice::range

private

stringFromIndexFunction

std::function<String (int, int)> juce::AudioParameterChoice::stringFromIndexFunction

private

value

std::atomic<float> juce::AudioParameterChoice::value

private

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The documentation for this class was generated from the following files:

• /home/runner/work/lmms-fork/lmms-fork/plugins/CarlaBase/carla/source/modules/juce_audio_processors/utilities/juce_AudioParameterChoice.h
• /home/runner/work/lmms-fork/lmms-fork/plugins/CarlaBase/carla/source/modules/juce_audio_processors/utilities/juce_AudioParameterChoice.cpp