fromDynamic static method

JsonInteractiveViewerBuilder? fromDynamic(dynamic map, { JsonWidgetRegistry? registry, })

Builds the builder from a Map-like dynamic structure. This expects the JSON format to be of the following structure:

{
  "alignment": "<Alignment>",
  "boundaryMargin": "<EdgeInsets>",
  "clipBehavior": "<Clip>",
  "constrained": "<bool>",
  "interactionEndFrictionCoefficient": "<double>",
  "maxScale": "<double>",
  "minScale": "<double>",
  "onInteractionEnd": "<GestureScaleEndCallback>",
  "onInteractionStart": "<GestureScaleStartCallback>",
  "onInteractionUpdate": "<GestureScaleUpdateCallback>",
  "panAxis": "<PanAxis>",
  "panEnabled": "<bool>",
  "scaleEnabled": "<bool>",
  "scaleFactor": "<double>",
  "transformationController": "<TransformationController>"
}

As a note, the GestureScaleEndCallback, GestureScaleStartCallback, GestureScaleUpdateCallback, and TransformationController cannot be decoded via JSON. Instead, the only way to bind those values to the builder is to use a function or a variable reference via the JsonWidgetRegistry.

See also:

• ThemeDecoder.decodeEdgeInsetsGeometry

Implementation

static JsonInteractiveViewerBuilder? fromDynamic(
  dynamic map, {
  JsonWidgetRegistry? registry,
}) {
  JsonInteractiveViewerBuilder? result;

  if (map != null) {
    result = JsonInteractiveViewerBuilder(
      alignment: ThemeDecoder.decodeAlignment(
        map['alignment'],
        validate: false,
      ),
      boundaryMargin: ThemeDecoder.decodeEdgeInsetsGeometry(
            map['boundaryMargin'],
            validate: false,
          ) as EdgeInsets? ??
          EdgeInsets.zero,
      clipBehavior: ThemeDecoder.decodeClip(
            map['clipBehavior'],
            validate: false,
          ) ??
          Clip.hardEdge,
      constrained: map['constrained'] == null
          ? true
          : JsonClass.parseBool(
              map['constrained'],
            ),
      interactionEndFrictionCoefficient: JsonClass.maybeParseDouble(
              map['interactionEndFrictionCoefficient']) ??
          0.0000135,
      maxScale: JsonClass.maybeParseDouble(
        map['maxScale'],
        2.5,
      )!,
      minScale: JsonClass.maybeParseDouble(
        map['minScale'],
        0.8,
      )!,
      onInteractionEnd: map['onInteractionEnd'],
      onInteractionStart: map['onInteractionStart'],
      onInteractionUpdate: map['onInteractionUpdate'],
      panAxis: ThemeDecoder.decodePanAxis(
            map['panAxis'],
            validate: false,
          ) ??
          PanAxis.free,
      panEnabled: map['panEnabled'] == null
          ? true
          : JsonClass.parseBool(
              map['panEnabled'],
            ),
      scaleEnabled: map['scaleEnabled'] == null
          ? true
          : JsonClass.parseBool(
              map['scaleEnabled'],
            ),
      scaleFactor: JsonClass.maybeParseDouble(map['scaleFactor']) ?? 200.0,
      transformationController: map['transformationController'],
    );
  }

  return result;
}