AnimatedScale class Null safety

Animated version of Transform.scale which automatically transitions the child's scale over a given duration whenever the given scale changes.

link
This code defines a widget that uses AnimatedScale to change the size of FlutterLogo gradually to a new scale whenever the button is pressed. 
class LogoScale extends StatefulWidget {
  const LogoScale({super.key});

  @override
  State<LogoScale> createState() => LogoScaleState();
}

class LogoScaleState extends State<LogoScale> {
  double scale = 1.0;

  void _changeScale() {
    setState(() => scale = scale == 1.0 ? 3.0 : 1.0);
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        ElevatedButton(
          onPressed: _changeScale,
          child: const Text('Scale Logo'),
        ),
        Padding(
          padding: const EdgeInsets.all(50),
          child: AnimatedScale(
            scale: scale,
            duration: const Duration(seconds: 2),
            child: const FlutterLogo(),
          ),
        ),
      ],
    );
  }
}

See also:

  • AnimatedRotation, for animating the rotation of a child.
  • AnimatedSize, for animating the resize of a child based on changes in layout.
  • AnimatedSlide, for animating the translation of a child by a given offset relative to its size.
  • ScaleTransition, an explicitly animated version of this widget, where an Animation is provided by the caller instead of being built in.
Inheritance

Constructors

AnimatedScale({Key? key, Widget? child, required double scale, Alignment alignment = Alignment.center, FilterQuality? filterQuality, Curve curve = Curves.linear, required Duration duration, VoidCallback? onEnd})
Creates a widget that animates its scale implicitly.
const

Properties

alignment → Alignment
The alignment of the origin of the coordinate system in which the scale takes place, relative to the size of the box.
final
child → Widget?
The widget below this widget in the tree.
final
curve → Curve
The curve to apply when animating the parameters of this container.
finalinherited
duration → Duration
The duration over which to animate the parameters of this container.
finalinherited
filterQuality → FilterQuality?
The filter quality with which to apply the transform as a bitmap operation.
final
hashCode → int
The hash code for this object.
nonVirtual">@nonVirtualread-onlyinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
onEnd → VoidCallback?
Called every time an animation completes.
finalinherited
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited
scale → double
The target scale.
final

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → ImplicitlyAnimatedWidgetState<AnimatedScale>
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.
protected">@protectedinherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
override
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">@nonVirtualinherited