ScaleController class
A controller for managing and notifying changes to a unit's value.
The ScaleController class extends ValueNotifier and is used to track a numeric value that represents a specific unit (e.g., weight, length) on the ruler. It provides a way to notify listeners when the value changes, enabling updates to the UI or other components that depend on the unit's current value.
ScaleController is designed to be used with widgets or other components that need to react to changes in a unit's value, such as updating the ruler position or displaying the current measurement value.
- Inheritance
-
- Object
- ChangeNotifier
- ValueNotifier<
num> - ScaleController
Constructors
- ScaleController({num value = 0})
- Creates a ScaleController with an initial value.
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- hasListeners → bool
-
Whether any listeners are currently registered.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- value ↔ num
-
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
-
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
-
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
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited