fromDynamic static method

JsonNetworkImageBuilder? 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>",
  "cacheHeight": "<int>",
  "cacheWidth": "<int>",
  "centerSlice": "<Rect>",
  "color": "<Color>",
  "colorBlendMode": "<BlendMode>",
  "errorBuilder": "<WidgetBuilder>",
  "excludeFromSemantics": "<bool>",
  "filterQuality": "<FilterQuality>",
  "fit": "<BoxFit>",
  "frameBuilder": "<ImageFrameBuilder>",
  "gaplessPlayback": "<bool>",
  "height": "<double>",
  "headers": "<<Map<String, String>>",
  "isAntiAlias": "<bool>",
  "loadingBuilder": "<ImageLoadingBuilder>",
  "matchTextDirection": "<bool>",
  "opacity": "<double>",
  "repeat": "<ImageRepeat>",
  "scale": "<double>",
  "semanticLabel": "<String>",
  "src": "<String>",
  "width": "<double>"
}

The "image" attribute can be either a base64 encoded String, or a Uint8List returned via a function or variable reference using the JsonWidgetRegistry.

As a note, the ImageErrorWidgetBuilder, ImageFrameBuilder, and ImageLoadingBuilder 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.decodeAlignment
• ThemeDecoder.decodeBlendMode
• ThemeDecoder.decodeColor
• ThemeDecoder.decodeImageRepeat

Implementation

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

  if (map != null) {
    result = JsonNetworkImageBuilder(
      alignment: ThemeDecoder.decodeAlignment(
            map['alignment'],
            validate: false,
          ) ??
          Alignment.center,
      cacheHeight: JsonClass.maybeParseInt(map['cacheHeight']),
      cacheWidth: JsonClass.maybeParseInt(map['cacheWidth']),
      centerSlice: ThemeDecoder.decodeRect(
        map['centerSlice'],
        validate: false,
      ),
      color: ThemeDecoder.decodeColor(
        map['color'],
        validate: false,
      ),
      colorBlendMode: ThemeDecoder.decodeBlendMode(
        map['colorBlendMode'],
        validate: false,
      ),
      errorBuilder: map['errorBuilder'],
      excludeFromSemantics: JsonClass.parseBool(map['excludeFromSemantics']),
      filterQuality: ThemeDecoder.decodeFilterQuality(
            map['filterQuality'],
            validate: false,
          ) ??
          FilterQuality.low,
      fit: ThemeDecoder.decodeBoxFit(
        map['fit'],
        validate: false,
      ),
      frameBuilder: map['frameBuilder'],
      gaplessPlayback: JsonClass.parseBool(map['gaplessPlayback']),
      height: JsonClass.maybeParseDouble(map['height']),
      headers: map['headers'] == null
          ? null
          : Map<String, String>.from(map['headers']),
      isAntiAlias: JsonClass.parseBool(map['isAntiAlias']),
      loadingBuilder: map['loadingBuilder'],
      matchTextDirection: JsonClass.parseBool(map['matchTextDirection']),
      opacity: JsonClass.maybeParseDouble(map['opacity']),
      repeat: ThemeDecoder.decodeImageRepeat(
            map['imageRepeat'],
            validate: false,
          ) ??
          ImageRepeat.noRepeat,
      scale: JsonClass.maybeParseDouble(map['scale'], 1.0)!,
      semanticLabel: map['semanticLabel'],
      src: map['src'],
      width: JsonClass.maybeParseDouble(map['width']),
    );
  }

  return result;
}