Animates its own size and clips and aligns its child.
SizeTransition acts as a ClipRect that animates either its width or its height, depending upon the value of axis. The alignment of the child along the axis is specified by the axisAlignment.
Like most widgets, SizeTransition will conform to the constraints it is given, so be sure to put it in a context where it can change size. For instance, if you place it into a Container with a fixed size, then the SizeTransition will not be able to change size, and will appear to do nothing.
Here's an illustration of the SizeTransition widget, with it's sizeFactor animated by a CurvedAnimation set to Curves.fastOutSlowIn:
This code defines a widget that uses SizeTransition to change the size of FlutterLogo continually. It is built with a Scaffold where the internal widget has space to change its size.
To create a local project with this code sample, run:
flutter create --sample=widgets.SizeTransition.1 mysample
See also:
- AnimatedCrossFade, for a widget that automatically animates between the sizes of two children, fading between them.
- ScaleTransition, a widget that scales the size of the child instead of clipping it.
- PositionedTransition, a widget that animates its child from a start position to an end position over the lifetime of the animation.
- RelativePositionedTransition, a widget that transitions its child's position based on the value of a rectangle relative to a bounding box.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- AnimatedWidget
- SizeTransition
Constructors
Properties
- axis → Axis
-
Axis.horizontal if sizeFactor modifies the width, otherwise
Axis.vertical.
final
- axisAlignment → double
-
Describes how to align the child along the axis that sizeFactor is
modifying.
final
- child → Widget?
-
The widget below this widget in the tree.
final
- fixedCrossAxisSizeFactor → double?
-
The factor by which to multiply the cross axis size of the child.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- listenable → Listenable
-
The Listenable to which this widget is listening.
finalinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
-
sizeFactor
→ Animation<
double> -
The animation that controls the (clipped) size of the child.
no setter
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 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