ITGUIParameter< T > Class Template Reference

Represents a gui parameter with its underlying backing type T (aka ParamType). More...

#include <IGUIParameter.h>

Inherits IGUIParameter.

Inherited by GUIJmbParameter< T >, GUIValParameter< T >, and GUIVstParameter< T >.

Classes
class	ITEditor
	Defines the API for the editor which can be obtained by calling ITGUIParameter::edit(). More...

Public Types
using	ParamType = T
	The type of the param (alias) More...
using	ValueAccessor = std::function< void(T const &)>
	API to access the value of the param. More...

Public Member Functions
virtual tresult	accessValue (ValueAccessor const &iGetter) const =0
	API to access the underlying value. More...
virtual std::unique_ptr< ITEditor >	edit ()=0
	Creates an editor to modify the parameter in a transactional fashion. More...
virtual std::unique_ptr< ITEditor >	edit (ParamType const &iValue)
	Shortcut api which creates an editor followed by ITEditor::setValue(ParamType const &) to set the parameter value to iValue. More...
virtual tresult	setValue (ParamType const &iValue)=0
	Unconditionally sets the value of the parameter to the value provided. More...
virtual bool	update (ParamType const &iValue)=0
	First check if the value provided (iValue) is different from the current value and if that is the case then updates it to the new value. More...
Public Member Functions inherited from IGUIParameter
virtual std::shared_ptr< GUIDiscreteParameter >	asDiscreteParameter (int32 iStepCount)=0
	Converts this parameter into a discrete parameter. More...
template<typename T >
std::shared_ptr< ITGUIParameter< T > >	cast ()
	Downcasts this parameter into a typed version. More...
virtual std::unique_ptr< FObjectCx >	connect (Parameters::IChangeListener *iChangeListener) const =0
	Creates a connection between this parameter and the change listener: whenever the parameter changes, the listener will be notified of the changes (Parameters::IChangeListener::onParameterChange(ParamID)). More...
virtual std::unique_ptr< FObjectCx >	connect (Parameters::ChangeCallback iChangeCallback) const =0
	Creates a connection between this parameter and the callback: whenever the parameter changes, the callback will be invoked (std::function<void()>). More...
virtual ParamID	getParamID () const =0
	Each parameter has a unique ID returned by this method. More...
virtual int32	getStepCount () const =0
	When a parameter is a discrete parameter (which means its underlying backing type is an int32 with values in the discrete range [0, getStepCount()]), this method will return the number of steps (> 0). More...
virtual tresult	resetToDefault ()=0
	Resets the parameter to its default value. More...
virtual std::string	toUTF8String (int32 iPrecision) const =0
	Returns the current value of the parameter as a string (which is properly UTF-8 encoded). More...

Detailed Description

template<typename T>
class pongasoft::VST::GUI::Params::ITGUIParameter< T >

Represents a gui parameter with its underlying backing type T (aka ParamType).

Since we know the ParamType, this subclass of IGUIParameter adds the basic manipulation methods to deal with the parameter.

Template Parameters

T	the underlying backing type (aka ParamType).

Member Typedef Documentation

ParamType

using ParamType = T

The type of the param (alias)

ValueAccessor

using ValueAccessor = std::function<void(T const &)>

API to access the value of the param.

See also

accessValue(ValueAccessor const &) const

Member Function Documentation

accessValue()

virtual tresult accessValue ( ValueAccessor const &  iGetter ) const

pure virtual

API to access the underlying value.

getValue() has a different api depending on the type of param (Vst and Jmb). As a result this interface only provides a common way to access it in both cases via an accessor which allows to:

• avoid copy in the case of Jmb
• avoid duplicating values in the case of Vst

Returns

kResultOk if the getter is called, and kResultFalse if the getter is not called for some reason

Implemented in GUIDiscreteJmbParameter< T >, and GUIRawVstParameter.

edit() [1/2]

virtual std::unique_ptr<ITEditor> edit ( )

pure virtual

Creates an editor to modify the parameter in a transactional fashion.

See also

ITGUIParameter::ITEditor

Implemented in GUIDiscreteJmbParameter< T >, GUIJmbParameter< T >, GUIVstParameter< T >, GUIRawVstParameter, GUIValParameter< T >, and GUIValParameter< int32 >.

edit() [2/2]

virtual std::unique_ptr<ITEditor> edit ( ParamType const &  iValue )

inlinevirtual

Shortcut api which creates an editor followed by ITEditor::setValue(ParamType const &) to set the parameter value to iValue.

setValue()

virtual tresult setValue ( ParamType const &  iValue )

pure virtual

Unconditionally sets the value of the parameter to the value provided.

Parameters

iValue

the value to set

Returns

kResultOk if successful

Implemented in GUIDiscreteJmbParameter< T >, GUIRawVstParameter, GUIVstParameter< T >, GUIJmbParameter< T >, GUIValParameter< T >, and GUIValParameter< int32 >.

update()

virtual bool update ( ParamType const &  iValue )

pure virtual

First check if the value provided (iValue) is different from the current value and if that is the case then updates it to the new value.

Note

If the type T does not provide a way to compare the value, then this call will delegate to setValue(ParamType const &) and return true.

Parameters

iValue

the value to update

Returns

true if the value was updated

Implemented in GUIDiscreteJmbParameter< T >, GUIRawVstParameter, GUIVstParameter< T >, GUIJmbParameter< T >, GUIValParameter< T >, and GUIValParameter< int32 >.

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

• pongasoft/VST/GUI/Params/IGUIParameter.h