FadeBox class final

The render-safe fade primitive: one named place where every Fluvie fade becomes pixels.

Paint-equivalent to a raw Opacity by construction:

  • at exactly 1.0 it mounts nothing — the child paints directly, exactly as Opacity at 1 would paint it (and as the keyframe applier paints an element with no opacity at all);
  • everywhere else it mounts a single Opacity with opacity clamped into [0, 1] (spring overshoot can push a composed keyframe past the bounds mid-flight);
  • at 0 the Opacity holds the layout slot while RenderOpacity skips painting entirely — hidden elements never collapse the layout.

The keyframe applier and MotionTarget's collect-pass placeholder build this instead of Opacity directly, so future fade upgrades (such as a shader fade) land in exactly one widget.

Inheritance
Available extensions

Constructors

FadeBox({required double opacity, required Widget child, Key? key})
Fades child to opacity (0 hidden, 1 fully painted).
const

Properties

child → Widget
The element being faded.
final
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
opacity → double
The fade value as given — clamped into [0, 1] only at build time, so probes and debuggers see the raw composed number.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

animate(List<Animation> animations, {Anchor? anchor, TimeRange? window, Defaults? defaults}) → Widget

Available on Widget, provided by the Animate extension

Binds animations to this widget by wrapping it in a MotionTarget.
build(BuildContext context) → Widget
Describes the part of the user interface represented by this widget.
override
createElement() → StatelessElement
Creates a StatelessElement to manage this widget's location in the tree.
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
show({Time? from, Time? to}) → Widget

Available on Widget, provided by the Animate extension

Visibility-window sugar: animate([], window: from.to(to)) with from defaulting to the window start and to to its end.
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