Lottie class

A Lottie/JSON animation rendered by the native thorvg engine into a Flutter Texture(textureId).

Rasterization runs on a per-instance native thread (HandlerThread on Android, DispatchQueue on iOS) so the Flutter UI isolate is never blocked by SwCanvas::draw. The widget's build cost is the cost of a Texture widget — effectively a sampler — independent of how many animations are on screen.

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatefulWidget
• Lottie

Constructors

Lottie({Key? key, required Future<String> data, required double width, required double height, required bool animate, required bool repeat, required bool reverse, double renderScale = 1.0, void onLoaded(ThorvgController controller)?})

const

Properties

animate → bool

final

data → Future<String>

final

hashCode → int

The hash code for this object.

no setter, inherited

height → double

final

key → Key?

Controls how one widget replaces another widget in the tree.

final, inherited

onLoaded → void Function(ThorvgController controller)?

Invoked once the native handle and texture are ready. Use the supplied ThorvgController to drive play/pause/seek/resize. The controller is owned by the widget and disposed automatically.

final

renderScale → double

Multiplier applied to the logical widget size when sizing the native rasterization buffer. The thorvg SwCanvas runs on the CPU, so cost scales with rendered pixel count.

final

repeat → bool

final

reverse → bool

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

width → double

final

Methods

createElement() → StatefulElement

Creates a StatefulElement to manage this widget's location in the tree.

inherited

createState() → State<Lottie>

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.

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

Static Methods

asset(String name, {Key? key, double? width, double? height, bool? animate, bool? repeat, bool? reverse, double? renderScale, AssetBundle? bundle, String? package, void onLoaded(ThorvgController)?}) → Lottie

file(File file, {Key? key, double? width, double? height, bool? animate, bool? repeat, bool? reverse, double? renderScale, void onLoaded(ThorvgController)?}) → Lottie

memory(Uint8List bytes, {Key? key, double? width, double? height, bool? animate, bool? repeat, bool? reverse, double? renderScale, void onLoaded(ThorvgController)?}) → Lottie

network(String src, {Key? key, double? width, double? height, bool? animate, bool? repeat, bool? reverse, double? renderScale, void onLoaded(ThorvgController)?}) → Lottie