animatableProps function

List<ScenePropSpec> animatableProps(SceneNode node)

Imposed plus the target kind's intrinsic properties, in canonical emit order.

Implementation

List<ScenePropSpec> animatableProps(SceneNode node) => [
  ...imposedProps,
  ...switch (node) {
    TextNode() => const [
      ScenePropSpec(
        'fontSize',
        TrackKind.number,
        unit: 'px',
        softMin: 8,
        softMax: 96,
      ),
      // Tracking is the one a display size wants animated, and it wants it
      // negative: a title that tightens as it lands.
      ScenePropSpec(
        'letterSpacing',
        TrackKind.number,
        identity: 0,
        unit: 'px',
        softMin: -8,
        softMax: 24,
        entrance: 12,
      ),
      ScenePropSpec(
        'wordSpacing',
        TrackKind.number,
        identity: 0,
        unit: 'px',
        softMin: -8,
        softMax: 24,
      ),
      ScenePropSpec(
        'lineHeight',
        TrackKind.number,
        identity: 1.15,
        softMin: 0.8,
        softMax: 2,
      ),
      ScenePropSpec(
        'decorationThickness',
        TrackKind.number,
        identity: 1,
        softMin: 0,
        softMax: 6,
      ),
      ScenePropSpec('color', TrackKind.color),
    ],
    FrameNode() => const [
      ScenePropSpec(
        'gap',
        TrackKind.number,
        unit: 'px',
        softMin: 0,
        softMax: 64,
      ),
      ScenePropSpec('fill', TrackKind.color),
    ],
    ShapeNode() => const [ScenePropSpec('fill', TrackKind.color)],
    // A registered kind's rows, with the hints the row carries.
    KindNode k => [
      for (var p in k.kind.props)
        if (p.animatable)
          ScenePropSpec(
            p.name,
            p.kind == ScenePropKind.color ? TrackKind.color : TrackKind.number,
            identity: p.identity,
            unit: p.unit,
            softMin: p.softMin,
            softMax: p.softMax,
            angular: p.angular,
          ),
    ],
    ExternalNode() => const <ScenePropSpec>[],
    // The child's declared parameters, once somebody resolved it — a string
    // parameter has no in-between values and does not animate.
    SceneRefNode r => [
      for (var p in r.instance?.params ?? const <SceneParamDecl>[])
        if (p.kind == SceneParamKind.number)
          ScenePropSpec('args.${p.name}', TrackKind.number)
        else if (p.kind == SceneParamKind.color)
          ScenePropSpec('args.${p.name}', TrackKind.color),
    ],
  },
];