JUCE
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An abstract base class for parameter objects that can be added to an AudioProcessor. More...
Public Types | |
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 } |
Public Member Functions | |
AudioProcessorParameter () noexcept | |
virtual | ~AudioProcessorParameter () |
Destructor. More... | |
virtual float | getValue () const =0 |
Called by the host to find out the value of this parameter. More... | |
virtual void | setValue (float newValue)=0 |
The host will call this method to change the value of a parameter. More... | |
void | setValueNotifyingHost (float newValue) |
A processor should call this when it needs to change one of its parameters. More... | |
void | beginChangeGesture () |
Sends a signal to the host to tell it that the user is about to start changing this parameter. More... | |
void | endChangeGesture () |
Tells the host that the user has finished changing this parameter. More... | |
virtual float | getDefaultValue () const =0 |
This should return the default value for this parameter. More... | |
virtual String | getName (int maximumStringLength) const =0 |
Returns the name to display for this parameter, which should be made to fit within the given string length. More... | |
virtual String | getLabel () const =0 |
Some parameters may be able to return a label string for their units. More... | |
virtual int | getNumSteps () const |
Returns the number of steps that this parameter's range should be quantised into. More... | |
virtual bool | isDiscrete () const |
Returns whether the parameter uses discrete values, based on the result of getNumSteps, or allows the host to select values continuously. More... | |
virtual String | getText (float value, int) const |
Returns a textual version of the supplied parameter value. More... | |
virtual float | getValueForText (const String &text) const =0 |
Should parse a string and return the appropriate value for it. More... | |
virtual bool | isOrientationInverted () const |
This can be overridden to tell the host that this parameter operates in the reverse direction. More... | |
virtual bool | isAutomatable () const |
Returns true if the host can automate this parameter. More... | |
virtual bool | isMetaParameter () const |
Should return true if this parameter is a "meta" parameter. More... | |
virtual Category | getCategory () const |
Returns the parameter's category. More... | |
int | getParameterIndex () const noexcept |
Returns the index of this parameter in its parent processor's parameter list. More... | |
An abstract base class for parameter objects that can be added to an AudioProcessor.
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noexcept |
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virtual |
Destructor.
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pure virtual |
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.
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pure virtual |
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.
void juce::AudioProcessorParameter::setValueNotifyingHost | ( | float | newValue | ) |
A processor should call this when it needs to change one of its parameters.
This could happen when the editor or some other internal operation changes a parameter. This method will call the setValue() method to change the value, and will then send a message to the host telling it about the change.
Note that to make sure the host correctly handles automation, you should call the beginChangeGesture() and endChangeGesture() methods to tell the host when the user has started and stopped changing the parameter.
void juce::AudioProcessorParameter::beginChangeGesture | ( | ) |
Sends a signal to the host to tell it that the user is about to start changing this parameter.
This allows the host to know when a parameter is actively being held by the user, and it may use this information to help it record automation. If you call this, it must be matched by a later call to endChangeGesture().
void juce::AudioProcessorParameter::endChangeGesture | ( | ) |
Tells the host that the user has finished changing this parameter.
This allows the host to know when a parameter is actively being held by the user, and it may use this information to help it record automation. A call to this method must follow a call to beginChangeGesture().
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pure virtual |
This should return the default value for this parameter.
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pure virtual |
Returns the name to display for this parameter, which should be made to fit within the given string length.
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pure virtual |
Some parameters may be able to return a label string for their units.
For example "Hz" or "%".
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virtual |
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.
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virtual |
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.
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virtual |
Returns a textual version of the supplied 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.
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pure virtual |
Should parse a string and return the appropriate value for it.
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virtual |
This can be overridden to tell the host that this parameter operates in the reverse direction.
(Not all plugin formats or hosts will actually use this information).
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virtual |
Returns true if the host can automate this parameter.
By default, this returns true.
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virtual |
Should return true if this parameter is a "meta" parameter.
A meta-parameter is a parameter that changes other params. It is used by some hosts (e.g. AudioUnit hosts). By default this returns false.
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virtual |
Returns the parameter's category.
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noexcept |
Returns the index of this parameter in its parent processor's parameter list.