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:
- AnimatedPositioned, which specifies the widget's position visually (the same as this widget, but for animating Positioned).
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- ImplicitlyAnimatedWidget
- AnimatedPositionedDirectional
Constructors
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.
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.
- height → double?
-
The child's height.
final
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- onEnd → VoidCallback?
-
Called every time an animation completes.
finalinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
read-onlyinherited
- 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">@protectedinherited -
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">@nonVirtualinherited