SizeTransition class Null safety

Animates its own size and clips and aligns its child.

SizeTransition acts as a ClipRect that animates either its width or its height, depending upon the value of axis. The alignment of the child along the axis is specified by the axisAlignment.

Like most widgets, SizeTransition will conform to the constraints it is given, so be sure to put it in a context where it can change size. For instance, if you place it into a Container with a fixed size, then the SizeTransition will not be able to change size, and will appear to do nothing.

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

link
This code defines a widget that uses SizeTransition to change the size of FlutterLogo continually. It is built with a Scaffold where the internal widget has space to change its size.
To create a local project with this code sample, run:
flutter create --sample=widgets.SizeTransition.1 mysample

See also:

  • AnimatedCrossFade, for a widget that automatically animates between the sizes of two children, fading between them.
  • ScaleTransition, a widget that scales the size of the child instead of clipping it.
  • 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.
Inheritance

Constructors

SizeTransition({Key? key, Axis axis = Axis.vertical, required Animation<double> sizeFactor, double axisAlignment = 0.0, Widget? child})
Creates a size transition.
const

Properties

axis → Axis
Axis.horizontal if sizeFactor modifies the width, otherwise Axis.vertical.
final
axisAlignment → double
Describes how to align the child along the axis that sizeFactor is modifying.
final
child → Widget?
The widget below this widget in the tree.
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
listenable → Listenable
The Listenable to which this widget is listening.
finalinherited
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited
sizeFactor → Animation<double>
The animation that controls the (clipped) size of the child.
read-only

Methods

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).
override
createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<AnimatedWidget>
Subclasses typically do not override this method.
inherited
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.
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">@nonVirtualinherited