AlignTransition class Null safety

Animated version of an Align that animates its Align.alignment property.

Here's an illustration of the DecoratedBoxTransition widget, with it's DecoratedBoxTransition.decoration animated by a CurvedAnimation set to Curves.decelerate:

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

See also:

  • AnimatedAlign, which animates changes to the alignment without taking an explicit Animation argument.
  • 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.
  • SlideTransition, a widget that animates the position of a widget relative to its normal position.
Inheritance

Constructors

AlignTransition({Key? key, required Animation<AlignmentGeometry> alignment, required Widget child, double? widthFactor, double? heightFactor})
Creates an animated Align whose AlignmentGeometry animation updates the widget. [...]
const

Properties

alignment Animation<AlignmentGeometry>
The animation that controls the child's alignment.
read-only
child Widget
The widget below this widget in the tree. [...]
final
hashCode int
The hash code for this object. [...]
@nonVirtual, read-only, inherited
heightFactor double?
If non-null, the child's height factor, see Align.heightFactor.
final
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
widthFactor double?
If non-null, the child's width factor, see Align.widthFactor.
final

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, inherited
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, inherited