ScaleTransition class Null safety

Animates the scale of a transformed widget.

Here's an illustration of the ScaleTransition widget, with it's alignment animated by a CurvedAnimation set to Curves.fastOutSlowIn:

The following code implements the ScaleTransition as seen in the video above:
To create a local project with this code sample, run:
flutter create --sample=widgets.ScaleTransition.1 mysample

See also:

  • PositionedTransition, a widget that animates its child from a start position to an end position over the lifetime of the animation.
  • RelativePositionedTransition, a widget that transitions its child's position based on the value of a rectangle relative to a bounding box.
  • SizeTransition, a widget that animates its own size and clips and aligns its child.


ScaleTransition({Key? key, required Animation<double> scale, Alignment alignment =, FilterQuality? filterQuality, Widget? child})
Creates a scale transition.


alignment Alignment
The alignment of the origin of the coordinate system in which the scale takes place, relative to the size of the box.
child Widget?
The widget below this widget in the tree.
filterQuality FilterQuality?
The filter quality with which to apply the transform as a bitmap operation.
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
listenable Listenable
The Listenable to which this widget is listening.
final, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
scale Animation<double>
The animation that controls the scale of the child.


build(BuildContext context) Widget
Override this method to build widgets that depend on the state of the listenable (e.g., the current value of the animation).
createElement() StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
createState() State<AnimatedWidget>
Subclasses typically do not override this method.
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.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
toString({DiagnosticLevel minLevel =}) String
A string representation of this object.
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a string representation of this node and its descendants.
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) String
Returns a one-line detailed description of the object.
toStringShort() String
A short, textual description of this widget.


operator ==(Object other) bool
The equality operator.
@nonVirtual, inherited