OnAnimationBuilder class Null safety

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

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. [...]
@nonVirtual, read-only, 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.
read-only, inherited

Methods

build(BuildContext context) Widget
Describes the part of the user interface represented by this widget. [...]
override
createElement() StatelessElement
Creates a StatelessElement to manage this widget's location in the tree. [...]
inherited
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent 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. [...]
@nonVirtual, inherited