LayoutDelegateSceneElement<T extends SceneElementLayoutDelegate> class abstract

A SceneElement which is layed out by a SceneElementLayoutDelegate.

The SceneElementLayoutDelegate used by an instance of this class can be replaced at runtime settings layoutDelegate. This will notify listeners of layoutDelegateChanges.

See also:

• LayoutDelegateBuilder for a Widget which rebuilds it's child when a LayoutDelegateSceneElement's SceneElementLayoutDelegate notifies it's listeners or is replaced.

Inheritance

• Object
• ChangeNotifier
• SceneElement
• LayoutDelegateSceneElement

Implementers

• Spotlight

Constructors

LayoutDelegateSceneElement({bool? enabled, required T layoutDelegate})

Creates a SceneElement which is layed out by a SceneElementLayoutDelegate.

Properties

enabled ↔ bool

Wether this element is enabled.

getter/setter pair, inherited

hashCode → int

The hash code for this object.

no setter, inherited

hasListeners → bool

Whether any listeners are currently registered.

no setter, inherited

layoutDelegate ↔ T

The SceneElementLayoutDelegate used by this element to lay itself out.

getter/setter pair

layoutDelegateChanges → ValueListenable<T>

A ValueListenable which notifies it's listeners when layoutDelegate changes.

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

addListener(VoidCallback listener) → void

Register a closure to be called when the object changes.

inherited

debugFillProperties(DiagnosticPropertiesBuilder properties) → void

Add additional properties associated with the node.

override

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).

override

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

toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode

Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.

inherited

toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String

A string representation of this object.

inherited

toStringShort() → String

A brief description of this object, usually just the runtimeType and the hashCode.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited