ViewportAxisContext class

A ChangeNotifier that manages has ViewportAxisContextState as subject.

It controls some meta information of headers depending on axis to define if it is about columns or rows.

See also:

  • ViewportContext the interface in which this state will be accessed in the widget tree. It contains one of this class for each axis.
  • ViewportContextProvider the widget in which the state calculates the value of this state.
Inheritance
Implemented types

Constructors

ViewportAxisContext(Axis axis, VirtualizationState virtualizationState)

Properties

axis → Axis
final
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 → ViewportAxisContextState
The current value of the object. When the value changes, the callbacks registered with addListener will be invoked.
no setteroverride
virtualizationState → VirtualizationState
The VirtualizationState that causes the computation of the ViewportAxisContextState.
final

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
setState(ViewportAxisContextState newValue) → void
toString() → String
A string representation of this object.
inherited

Operators

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