SlideTransition class

Animates the position of a widget relative to its normal position.

The translation is expressed as an Offset scaled to the child's size. For example, an Offset with a dx of 0.25 will result in a horizontal translation of one quarter the width of the child.

By default, the offsets are applied in the coordinate system of the canvas (so positive x offsets move the child towards the right). If a textDirection is provided, then the offsets are applied in the reading direction, so in right-to-left text, positive x offsets move towards the left, and in left-to-right text, positive x offsets move towards the right.

Here's an illustration of the SlideTransition widget, with its position animated by a CurvedAnimation set to Curves.elasticIn:

The following code implements the SlideTransition as seen in the video above:

class _MyStatefulWidgetState extends State<MyStatefulWidget> with SingleTickerProviderStateMixin {
  AnimationController _controller;
  Animation<Offset> _offsetAnimation;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      duration: const Duration(seconds: 2),
      vsync: this,
    )..repeat(reverse: true);
    _offsetAnimation = Tween<Offset>(
      begin: Offset.zero,
      end: const Offset(1.5, 0.0),
    ).animate(CurvedAnimation(
      parent: _controller,
      curve: Curves.elasticIn,
    ));
  }

  @override
  void dispose() {
    super.dispose();
    _controller.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return SlideTransition(
      position: _offsetAnimation,
      child: const Padding(
        padding: EdgeInsets.all(8.0),
        child: FlutterLogo(size: 150.0),
      ),
    );
  }
}

To create a sample project with this code snippet, run:
flutter create --sample=widgets.SlideTransition.1 mysample

// Flutter code sample for SlideTransition

// The following code implements the [SlideTransition] as seen in the video
// above:

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

/// This Widget is the main application widget.
class MyApp extends StatelessWidget {
  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: _title,
      home: Scaffold(
        appBar: AppBar(title: const Text(_title)),
        body: Center(
          child: MyStatefulWidget(),
        ),
      ),
    );
  }
}

class MyStatefulWidget extends StatefulWidget {
  MyStatefulWidget({Key key}) : super(key: key);

  @override
  _MyStatefulWidgetState createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State<MyStatefulWidget>
    with SingleTickerProviderStateMixin {
  AnimationController _controller;
  Animation<Offset> _offsetAnimation;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      duration: const Duration(seconds: 2),
      vsync: this,
    )..repeat(reverse: true);
    _offsetAnimation = Tween<Offset>(
      begin: Offset.zero,
      end: const Offset(1.5, 0.0),
    ).animate(CurvedAnimation(
      parent: _controller,
      curve: Curves.elasticIn,
    ));
  }

  @override
  void dispose() {
    super.dispose();
    _controller.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return SlideTransition(
      position: _offsetAnimation,
      child: const Padding(
        padding: EdgeInsets.all(8.0),
        child: FlutterLogo(size: 150.0),
      ),
    );
  }
}

Constructors

SlideTransition({Key key, @required Animation<Offset> position, bool transformHitTests: true, TextDirection textDirection, Widget child}): Creates a fractional translation transition. [...]
const

Properties

child → Widget: The widget below this widget in the tree. [...]
final
position → Animation<Offset>: The animation that controls the position of the child. [...]
read-only
textDirection → TextDirection: The direction to use for the x offset described by the position. [...]
final
transformHitTests → bool: Whether hit testing should be affected by the slide animation. [...]
final
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
listenable → Listenable: The Listenable to which this widget is listening. [...]
final, inherited
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() → _AnimatedState: Subclasses typically do not override this method.
inherited
debugDescribeChildren() → List<DiagnosticsNode>: Returns a list of DiagnosticsNode objects 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.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

widgets library

SlideTransition class

Constructors

Properties

Methods

Operators