SceneElement class abstract

An element of a Scene.

The visual representation of an element is determined by the WindowDelegate of the Window in which it appears. This allows every Window to show a different representation of the Scene. When the state of a SceneElement changes and as a result Windows need to update the elements representation, call notifyListeners.

This class does not specify how a SceneElement is layed out within a Scene. To implement your own SceneElement extend from one of the subclasses which implement layout:

• LayoutDelegateSceneElement for an element whose size and position is explicitly specified.
• LayedOutSceneElement for an element hose size is explicitly specified but hose position is determined through the Flutter layout system.

See also:

• Scene for the Widget which establishes a coordinate system and a scope for SceneElements in it's subtree.
• Window for the Widget wich paints the SceneElements of the Scene above it.
• WindowDelegate for the object which provides the visual representation of SceneElements.

Inheritance

• Object
• ChangeNotifier
• SceneElement

Mixed in types

• Diagnosticable

Implementers

• LayedOutSceneElement
• LayoutDelegateSceneElement

Constructors

SceneElement({bool? enabled})

Constructor for subclasses.

Properties

enabled ↔ bool

Wether this element is enabled.

getter/setter pair

hashCode → int

The hash code for this object.

no setter, inherited

hasListeners → bool

Whether any listeners are currently registered.

no setter, inherited

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).

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

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