APadding class

Physics-based equivalent of AnimatedPadding, renamed to APadding.

Animates changes in padding using physics-based animations, providing more natural and configurable transitions compared to curve-based animations.

{@macro ImplicitlyPhysicsAnimatedWidget}

{@tool snippet} This example shows a container that expands its padding with spring physics:

class _MyWidget extends StatefulWidget {
  @override
  State<_MyWidget> createState() => _MyWidgetState();
}

class _MyWidgetState extends State<_MyWidget> {
  bool _expanded = false;

  @override
  Widget build(BuildContext context) {
    return APadding(
      physics: Spring.elegant,
      padding: EdgeInsets.all(_expanded ? 32.0 : 8.0),
      child: GestureDetector(
        onTap: () => setState(() => _expanded = !_expanded),
        child: Container(
          color: Colors.blue,
          child: const Center(child: Text('Tap me!')),
        ),
      ),
    );
  }
}

{@end-tool}

See also:

  • AContainer, which can animate padding along with other properties
  • BetterPadding, which handles negative padding values correctly
Inheritance

Constructors

APadding({Key? key, required EdgeInsets padding, Duration? duration, Physics? physics, Widget? child, VoidCallback? onEnd})
Creates a new APadding. Physics-based equivalent of AnimatedPadding, renamed to APadding.
const

Properties

child → Widget?
final
duration → Duration?
The duration of the animation.
finalinherited
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
onEnd → VoidCallback?
A callback that is called when an animation completes.
finalinherited
padding → EdgeInsets
final
physics → Physics?
The physics or curve that controls how the animation moves.
finalinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<APadding>
Creates the mutable state for this widget at a given location in the tree.
override
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, 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