KnobController class

Controls a knob, and provides updates when the value is changing.

Inheritance

Constructors

KnobController({double initial = 0, double minimum = 0, double maximum = 100, double startAngle = 0, double endAngle = 180, int precision = 2})
Constructs a KnobController

Properties

endAngle → double
end angle of knob in degree
final
hashCode → int
The hash code for this object.
no setterinherited
hasListeners → bool
Whether any listeners are currently registered.
no setterinherited
initial → double
initial value of knob must between minimum & maximum
final
maximum → double
maximum value of knob
final
minimum → double
minimum value of knob
final
precision → int
precision of value
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
startAngle → double
start angle of knob in degree
final
value ↔ KnobValue
The current value stored in this notifier.
getter/setter pairinherited

Methods

addListener(VoidCallback listener) → void
Register a closure to be called when the object changes.
inherited
addOnValueChangedListener(OnValueChangedCallback listener) → void
Register a VoidCallback closure to be called when the controller gets initialized
dispose() → void
Discards any resources used by the object. After this is called, the object is not in a usable state and should be discarded (calls to addListener will throw after the object is disposed).
inherited
getAngleOfValue(double newValue) → double
Return angle of knob in degree corresponding to the provided value
getValueOfAngle(double angle) → double
Return value of knob corresponding to the provided angle in radian
isInValidRange(double angle) → bool
Check if the provided angle in radian is in valid range
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
notifyListeners() → void
Call all the registered listeners.
inherited
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
removeOnValueChangedListener(OnValueChangedCallback listener) → void
Remove a previously registered closure from the list of onInit closures
setCurrentValue(double newValue) → void
set current value of knob & notify all listeners make sure the value is between the provided min & max
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited