AnimatedPositionedDirectional class Null safety

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

The ambient Directionality is used to determine whether start is to the left or to the right.

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

This widget is a good choice if the size of the child would end up changing as a result of this animation. If the size is intended to remain the same, with only the position changing over time, then consider SlideTransition instead. SlideTransition only triggers a repaint each frame of the animation, whereas AnimatedPositionedDirectional will trigger a relayout as well. (SlideTransition is also text-direction-aware.)

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

See also:

Inheritance

Constructors

AnimatedPositionedDirectional({Key? key, required Widget child, double? start, double? top, double? end, double? bottom, double? width, double? height, Curve curve = Curves.linear, required Duration duration, VoidCallback? onEnd})
Creates a widget that animates its position implicitly.
const

Properties

bottom double?
The offset of the child's bottom edge from the bottom of the stack.
final
child Widget
The widget below this widget in the tree.
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
end double?
The offset of the child's end edge from the end of the stack.
final
hashCode int
The hash code for this object.
@nonVirtual, read-only, inherited
height double?
The child's height.
final
key Key?
Controls how one widget replaces another widget in the tree.
final, inherited
onEnd VoidCallback?
Called every time an animation completes.
final, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
start double?
The offset of the child's start edge from the start of the stack.
final
top double?
The offset of the child's top edge from the top of the stack.
final
width double?
The child's width.
final

Methods

createElement() StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() AnimatedWidgetBaseState<AnimatedPositionedDirectional>
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.
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
override
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