AnimatedAlignModifier class

Animated version of Align which automatically transitions the child's position over a given duration whenever the given alignment changes.

Here's an illustration of what this can look like, using a curve of Curves.fastOutSlowIn.

For the animation, you can choose a curve as well as a duration and the widget will automatically animate to the new target alignment. If you require more control over the animation (e.g. if you want to stop it mid-animation), consider using an AlignTransition instead, which takes a provided Animation as argument. While that allows you to fine-tune the animation, it also requires more development overhead as you have to manually manage the lifecycle of the underlying AnimationController.

{@tool dartpad} The following code implements the AnimatedAlign widget, using a curve of Curves.fastOutSlowIn.

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

See also:

• AnimatedContainer, which can transition more values at once.
• AnimatedPadding, which can animate the padding instead of the alignment.
• 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

• Object
• DiagnosticableTree
• Widget
• StatelessWidget
• SingleChildStatelessModifier
• SingleChildImplicitlyAnimatedModifier
• AnimatedAlignModifier

Available extensions

• ModifierTransformer

Constructors

AnimatedAlignModifier({Key? key, Key? modifierKey, Curve curve = Curves.linear, Widget? child, required Duration duration, VoidCallback? onEnd, required AlignmentGeometry alignment, double? heightFactor, double? widthFactor})

Creates a widget that 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.

final, inherited

duration → Duration

The duration over which to animate the parameters of this container.

final, inherited

hashCode → int

The hash code for this object.

no setter, inherited

heightFactor → double?

If non-null, sets its height to the child's height multiplied by this factor.

final

key → Key?

Controls how one widget replaces another widget in the tree.

final, inherited

modifierKey → Key?

The actual key of the widget, which Modifier wrapped

final, inherited

onEnd → VoidCallback?

Called every time an animation completes.

final, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

widthFactor → double?

If non-null, sets its width to the child's width multiplied by this factor.

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

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}) → 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