OnAnimationBuilder class

Widget used to listen to an InjectedAnimation and call its builder each time the animation ticks.

Example of Implicit Animated Container

 final animation = RM.injectAnimation(
   duration: Duration(seconds: 2),
   curve: Curves.fastOutSlowIn,
 );

 class _MyStatefulWidgetState extends State<MyStatefulWidget> {
   bool selected = false;

   @override
   Widget build(BuildContext context) {
     return GestureDetector(
       onTap: () {
         setState(() {
           selected = !selected;
         });
       },
       child: Center(
         child: OnAnimationBuilder(
           listenTo: animation,
           builder: (animate) {
             final width = animate(selected ? 200.0 : 100.0);
             final height = animate(selected ? 100.0 : 200.0, 'height');
             final alignment = animate(
               selected ? Alignment.center : AlignmentDirectional.topCenter,
             );
             final Color? color = animate(
               selected ? Colors.red : Colors.blue,
             );
             return Container(
               width: width,
               height: height,
               color: color,
               alignment: alignment,
               child: const FlutterLogo(size: 75),
             );
           },
         ),
       ),
     );
   }
 }

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatefulWidget
• OnAnimationBuilder

Constructors

OnAnimationBuilder({Key? key, required InjectedAnimation listenTo, required Widget builder(Animate), void onInitialized()?})

const

Properties

builder → Widget Function(Animate)

The builder callback. It is invoked for each tick. It exposes an Animate object. The Animate object is used to set Tweens, explicitly or implicitly

final

hashCode → int

The hash code for this object.

no setter, inherited

key → Key?

Controls how one widget replaces another widget in the tree.

final, inherited

listenTo → InjectedAnimation

InjectedAnimation to listen to.

final

onInitialized → void Function()?

Callback fired after animation is set up.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

createElement() → StatefulElement

Creates a StatefulElement to manage this widget's location in the tree.

inherited

createState() → _OnAnimationBuilderState

Creates the mutable state for this widget at a given location in the tree.

override

debugDescribeChildren() → List<DiagnosticsNode>

Returns a list of DiagnosticsNode objects describing this node's children.

inherited

debugFillProperties(DiagnosticPropertiesBuilder properties) → void

Add additional properties associated with the node.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

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

toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String

Returns a string representation of this node and its descendants.

inherited

toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String

Returns a one-line detailed description of the object.

inherited

toStringShort() → String

A short, textual description of this widget.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited