PositionedTransitionModifier class

Animated version of Positioned which takes a specific Animation<RelativeRect> to transition the child's position from a start position to an end position over the lifetime of the animation.

Only works if it's the child of a Stack.

Here's an illustration of the PositionedTransition widget, with it's rect animated by a CurvedAnimation set to Curves.elasticInOut:

{@tool dartpad} The following code implements the PositionedTransition as seen in the video above:

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

See also:

• AnimatedPositioned, which transitions a child's position without taking an explicit Animation argument.
• RelativePositionedTransition, a widget that transitions its child's position based on the value of a rectangle relative to a bounding box.
• SlideTransition, a widget that animates the position of a widget relative to its normal position.
• AlignTransition, an animated version of an Align that animates its Align.alignment property.
• ScaleTransition, a widget that animates the scale of a transformed widget.
• SizeTransition, a widget that animates its own size and clips and aligns its child.

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatelessWidget
• SingleChildStatelessModifier
• PositionedTransitionModifier

Available extensions

• ModifierTransformer

Constructors

PositionedTransitionModifier({Key? key, Widget? child, Key? modifierKey, required Animation<RelativeRect> rect})

Creates a transition for Positioned.

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

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

rect → Animation<RelativeRect>

The animation that controls the child's size and position.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

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