AnimatedPositioned class

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

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 AnimatedPositioned will trigger a relayout as well.

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

See also:

Inheritance

Constructors

AnimatedPositioned({Key key, @required Widget child, double left, double top, double right, double bottom, double width, double height, Curve curve: Curves.linear, @required Duration duration })
Creates a widget that animates its position implicitly. [...]
const
AnimatedPositioned.fromRect({Key key, Widget child, Rect rect, Curve curve: Curves.linear, @required Duration duration })
Creates a widget that animates the rectangle it occupies implicitly. [...]

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
height → double
The child's height. [...]
final
left → double
The offset of the child's left edge from the left of the stack.
final
The offset of the child's right edge from the right 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
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
hashCode → int
The hash code for this object. [...]
read-only, inherited
key → Key
Controls how one widget replaces another widget in the tree. [...]
final, inherited
runtimeType → Type
A representation of the runtime type of the object.
read-only, inherited

Methods

createState() → _AnimatedPositionedState
Creates the mutable state for this widget at a given location in the tree. [...]
override
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node. [...]
override
createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree. [...]
inherited
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, 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 toStringDeep. [...]
inherited
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug }) → String
Returns 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 ==(dynamic other) → bool
The equality operator. [...]
inherited