AudioParameterChoice Class Reference

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

Inheritance diagram for AudioParameterChoice:

Public Member Functions
	AudioParameterChoice (const ParameterID &parameterID, const String &parameterName, const StringArray &choices, int defaultItemIndex, const AudioParameterChoiceAttributes &attributes={})
	Creates a AudioParameterChoice with the specified parameters.
	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)
	Creates a AudioParameterChoice with the specified parameters.
	~AudioParameterChoice () override
	Destructor.
int	getIndex () const noexcept
	Returns the current index of the selected item.
	operator int () const noexcept
	Returns the current index of the selected item.
String	getCurrentChoiceName () const noexcept
	Returns the name of the currently selected item.
	operator String () const noexcept
	Returns the name of the currently selected item.
AudioParameterChoice &	operator= (int newValue)
	Changes the selected item to a new index.
const NormalisableRange< float > &	getNormalisableRange () const override
	Returns the range of values that the parameter can take.
Public Member Functions inherited from RangedAudioParameter
int	getNumSteps () const override
	Returns the number of steps for this parameter based on the normalisable range's interval.
float	convertTo0to1 (float v) const noexcept
	Normalises and snaps a value based on the normalisable range.
float	convertFrom0to1 (float v) const noexcept
	Denormalises and snaps a value based on the normalisable range.
	AudioProcessorParameterWithID (const ParameterID &parameterID, const String &parameterName, const AudioProcessorParameterWithIDAttributes &attributes={})
	The creation of this object requires providing a name and ID which will be constant for its lifetime.
	AudioProcessorParameterWithID (const ParameterID &parameterID, const String &parameterName, const String &parameterLabel, Category parameterCategory=AudioProcessorParameter::genericParameter)
	The creation of this object requires providing a name and ID which will be constant for its lifetime.
Public Member Functions inherited from AudioProcessorParameterWithID
	AudioProcessorParameterWithID (const ParameterID &parameterID, const String &parameterName, const AudioProcessorParameterWithIDAttributes &attributes={})
	The creation of this object requires providing a name and ID which will be constant for its lifetime.
	AudioProcessorParameterWithID (const ParameterID &parameterID, const String &parameterName, const String &parameterLabel, Category parameterCategory=AudioProcessorParameter::genericParameter)
	The creation of this object requires providing a name and ID which will be constant for its lifetime.
String	getName (int) const override
	Returns the name to display for this parameter, which should be made to fit within the given string length.
String	getLabel () const override
	Some parameters may be able to return a label string for their units.
Category	getCategory () const override
	Returns the parameter's category.
String	getParameterID () const override
	Returns an ID that is unique to this parameter.
bool	isMetaParameter () const override
	Should return true if this parameter is a "meta" parameter.
bool	isAutomatable () const override
	Returns true if the host can automate this parameter.
bool	isOrientationInverted () const override
	This can be overridden to tell the host that this parameter operates in the reverse direction.
Public Member Functions inherited from HostedAudioProcessorParameter
	AudioProcessorParameter () noexcept=default
	AudioProcessorParameter (int versionHint)
	The version hint supplied to this constructor is used in Audio Unit plugins to aid ordering parameter identifiers when JUCE_FORCE_USE_LEGACY_PARAM_IDS is not enabled.
Public Member Functions inherited from AudioProcessorParameter
	AudioProcessorParameter () noexcept=default
	AudioProcessorParameter (int versionHint)
	The version hint supplied to this constructor is used in Audio Unit plugins to aid ordering parameter identifiers when JUCE_FORCE_USE_LEGACY_PARAM_IDS is not enabled.
virtual	~AudioProcessorParameter ()
	Destructor.
void	setValueNotifyingHost (float newValue)
	A processor should call this when it needs to change one of its parameters.
void	beginChangeGesture ()
	Sends a signal to the host to tell it that the user is about to start changing this parameter.
void	endChangeGesture ()
	Tells the host that the user has finished changing this parameter.
virtual bool	isBoolean () const
	Returns whether the parameter represents a boolean switch, typically with "On" and "Off" states.
int	getParameterIndex () const noexcept
	Returns the index of this parameter in its parent processor's parameter list.
virtual String	getCurrentValueAsText () const
	Returns the current value of the parameter as a String.
virtual StringArray	getAllValueStrings () const
	Returns the set of strings which represent the possible states a parameter can be in.
int	getVersionHint () const
void	addListener (Listener *newListener)
	Registers a listener to receive events when the parameter's state changes.
void	removeListener (Listener *listener)
	Removes a previously registered parameter listener.
void	sendValueChangedMessageToListeners (float newValue)

Public Attributes
const StringArray	choices
	Provides access to the list of choices that this parameter is working with.
Public Attributes inherited from AudioProcessorParameterWithID
const String	paramID
	Provides access to the parameter's ID string.
const String	name
	Provides access to the parameter's name.
const String	label
	Provides access to the parameter's label.
const Category	category
	Provides access to the parameter's category.

Protected Member Functions
virtual void	valueChanged (int newValue)
	Override this method if you are interested in receiving callbacks when the parameter value changes.

Additional Inherited Members
Public Types inherited from 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

Constructor & Destructor Documentation

AudioParameterChoice() [1/2]

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

References choices.

Referenced by AudioParameterChoice(), operator=(), and valueChanged().

AudioParameterChoice() [2/2]

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 )

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.

References AudioParameterChoice().

~AudioParameterChoice()

AudioParameterChoice::~AudioParameterChoice ( )

override

Destructor.

Member Function Documentation

getIndex()

int AudioParameterChoice::getIndex ( ) const

noexcept

Returns the current index of the selected item.

References roundToInt().

Referenced by getCurrentChoiceName(), and operator int().

operator int()

AudioParameterChoice::operator int ( ) const

noexcept

Returns the current index of the selected item.

References getIndex().

getCurrentChoiceName()

String AudioParameterChoice::getCurrentChoiceName ( ) const

noexcept

Returns the name of the currently selected item.

References choices, and getIndex().

Referenced by operator String().

operator String()

AudioParameterChoice::operator String ( ) const

noexcept

Returns the name of the currently selected item.

References getCurrentChoiceName().

operator=()

AudioParameterChoice & AudioParameterChoice::operator=

(

int

newValue

)

Changes the selected item to a new index.

References AudioParameterChoice().

getNormalisableRange()

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

overridevirtual

Returns the range of values that the parameter can take.

Implements RangedAudioParameter.

valueChanged()

virtual void AudioParameterChoice::valueChanged ( int newValue )

protectedvirtual

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

References AudioParameterChoice().

Member Data Documentation

choices

const StringArray AudioParameterChoice::choices

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

Referenced by AudioParameterChoice(), and getCurrentChoiceName().