SceneElementLayoutDelegate class abstract
Delegate which determines the layout of a LayoutDelegateSceneElement in the Scene.
Implementations of this class layout their SceneElement by returning a Widget from buildPositioned which is placed in a Stack. This Stack is positioned at the Scene coordinate systems origin.
When the state of a delegate changes and as a result the Widgets returned from buildPositioned and/or buildContent need to be rebuild, call notifyListeners.
See also:
- PositionedBoxLayoutDelegate for a layout delegate which lays out the SceneElement at a specified position and size.
- AlignedBoxLayoutDelegate for a layout delegate which aligns the SceneElement within the Scenes bounds, with a specified size.
- Inheritance
-
- Object
- ChangeNotifier
- SceneElementLayoutDelegate
- Mixed in types
- Implementers
Constructors
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
Methods
-
addListener(
VoidCallback listener) → void -
Register a closure to be called when the object changes.
inherited
-
buildContent(
BuildContext context) → Widget? - Optionally builds the Widget whose size determines the size of the SceneElement.
-
buildPositioned(
BuildContext context, Widget content) → Widget - Builds the Widget which positions the SceneElement in the Scene's Stack.
-
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
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
-
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