AnimatedPositionedDirectionalModifier class

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
Available extensions

Constructors

AnimatedPositionedDirectionalModifier({Key? key, Key? modifierKey, Widget? child, Curve curve = Curves.linear, required Duration duration, VoidCallback? onEnd, double? start, double? top, double? end, double? bottom, double? width, double? height})
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
curve → Curve
The curve to apply when animating the parameters of this container.
finalinherited
duration → Duration
The duration over which to animate the parameters of this container.
finalinherited
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.
no setterinherited
height → double?
The child's height.
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
modifierKey → Key?
The actual key of the widget, which Modifier wrapped
finalinherited
onEnd → VoidCallback?
Called every time an animation completes.
finalinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
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

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