PositionedTransition class Null safety
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:
The following code implements the PositionedTransition as seen in the video
above:
To create a local project with this code sample, run:
flutter create --sample=widgets.PositionedTransition.1 mysample
flutter create --sample=widgets.PositionedTransition.1 mysample
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
- StatefulWidget
- AnimatedWidget
- PositionedTransition
Constructors
-
PositionedTransition({Key? key, required Animation<
RelativeRect> rect, required Widget child}) -
Creates a transition for Positioned.
const
Properties
- child → Widget
-
The widget below this widget in the tree.
final
- hashCode → int
-
The hash code for this object.
@nonVirtual, read-only, inherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
final, inherited
- listenable → Listenable
-
The Listenable to which this widget is listening.
final, inherited
-
rect
→ Animation<
RelativeRect> -
The animation that controls the child's size and position.
read-only
- runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited
Methods
-
build(
BuildContext context) → Widget -
Override this method to build widgets that depend on the state of the
listenable (e.g., the current value of the animation).
override
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → State< AnimatedWidget> -
Subclasses typically do not override this method.
inherited
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of
DiagnosticsNodeobjects describing this node's children.@protected, inherited -
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
inherited
-
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