AnimatedFractionallySizedBoxModifier class

Animated version of FractionallySizedBox which automatically transitions the child's size over a given duration whenever the given widthFactor or heightFactor changes, as well as the position whenever the given alignment changes.

For the animation, you can choose a curve as well as a duration and the widget will automatically animate to the new target widthFactor or heightFactor.

{@tool dartpad} The following example transitions an AnimatedFractionallySizedBox between two states. It adjusts the heightFactor, widthFactor, and alignment properties when tapped, using a curve of Curves.fastOutSlowIn

** See code in examples/api/lib/widgets/implicit_animations/animated_fractionally_sized_box.0.dart ** {@end-tool}

See also:

  • AnimatedAlign, which is an implicitly animated version of Align.
  • AnimatedContainer, which can transition more values at once.
  • AnimatedSlide, which can animate the translation of child by a given offset relative to its size.
  • AnimatedPositioned, which, as a child of a Stack, automatically transitions its child's position over a given duration whenever the given position changes.
Inheritance
Available extensions

Constructors

AnimatedFractionallySizedBoxModifier({Key? key, Widget? child, Key? modifierKey, AlignmentGeometry alignment = Alignment.center, double? heightFactor, double? widthFactor, Curve curve = Curves.linear, required Duration duration, VoidCallback? onEnd})
Creates a widget that sizes its child to a fraction of the total available space that animates implicitly, and positions its child by an alignment that animates implicitly.
const

Properties

alignment → AlignmentGeometry
How to align the child.
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
hashCode → int
The hash code for this object.
no setterinherited
heightFactor → double?
If non-null, the fraction of the incoming height given to the child.
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
modifierKey → Key?
The actual key of the widget, which Modifier wrapped
finalinherited
onEnd → VoidCallback?
Called every time an animation completes.
finalinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
widthFactor → double?
If non-null, the fraction of the incoming width given to the child.
final

Methods

build(BuildContext context) → Widget
Describes the part of the user interface represented by this widget.
inherited
buildWithChild(BuildContext context, Widget? child) → Widget
A build method that receives an extra child parameter.
override
createElement() → SingleChildStatelessElement
Create a SingleChildStatelessElement
inherited
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
modified() → Modifier

Available on Widget, provided by the ModifierTransformer extension

Transform normal widget to Modifier
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, int wrapWidth = 65}) → 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