fromDynamic static method
Builds the builder from a Map-like dynamic structure. This expects the JSON format to be of the following structure:
{
"addAutomaticKeepAlives": <bool>,
"addRepaintBoundaries": <bool>,
"addSemanticIndexes": <bool>,
"cacheExtent": <double>,
"clipBehavior": <Clip>,
"controller": <ScrollController>,
"dragStartBehavior": <DragStartBehavior>,
"itemExtent": <double>,
"gridDelegate": <SliverGridDelegate>,
"keyboardDismissBehavior": <ScrollViewKeyboardDismissBehavior>,
"padding": <EdgeInsetsGeometry>,
"physics": <ScrollPhysics>,
"primary": <bool>,
"prototypeItem": <JsonWidgetData>,
"restorationId": <String>,
"reverse": <bool>,
"scrollDirection": <Axis>,
"shrinkWrap": <bool>
}
As a note, the ScrollController 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.
The "gridDelegate" can be passed in via a variable or it can be decoded using one of the two schemas:
{
"type": "max_cross_axis_extent",
"childAspectRatio": <double?>,
"crossAxisSpacing": <double?>,
"mainAxisExtent": <double?>,
"mainAxisSpacing": <double?>,
"maxCrossAxisExtent": "<double>"
}
... or ...
{
"type": "fixed_cross_axis_count",
"crossAxisCount": <int>,
"childAspectRatio": <double?>,
"crossAxisSpacing": <double?>,
"mainAxisExtent": <double?>,
"mainAxisSpacing": <double?>
}
See also:
ThemeDecoder.decodeAxis
ThemeDecoder.decodeClip
ThemeDecoder.decodeDragStartBehavior
ThemeDecoder.decodeEdgeInsetsGeometry
ThemeDecoder.decodeScrollPhysics
Implementation
static JsonGridViewBuilder? fromDynamic(
dynamic map, {
JsonWidgetRegistry? registry,
}) {
JsonGridViewBuilder? result;
if (map != null) {
result = JsonGridViewBuilder(
addAutomaticKeepAlives: map['addAutomaticKeepAlives'] == null
? true
: JsonClass.parseBool(map['addAutomaticKeepAlives']),
addRepaintBoundaries: map['addRepaintBoundaries'] == null
? true
: JsonClass.parseBool(map['addRepaintBoundaries']),
addSemanticIndexes: map['addSemanticIndexes'] == null
? true
: JsonClass.parseBool(map['addSemanticIndexes']),
cacheExtent: JsonClass.parseDouble(map['cacheExtent']),
clipBehavior: ThemeDecoder.decodeClip(
map['clipBehavior'],
validate: false,
) ??
Clip.hardEdge,
controller: map['controller'],
dragStartBehavior: ThemeDecoder.decodeDragStartBehavior(
map['dragStartBehavior'],
validate: false,
) ??
DragStartBehavior.start,
gridDelegate: map['gridDelegate'],
keyboardDismissBehavior:
ThemeDecoder.decodeScrollViewKeyboardDismissBehavior(
map['keyboardDismissBehavior'],
validate: false,
) ??
ScrollViewKeyboardDismissBehavior.manual,
padding: ThemeDecoder.decodeEdgeInsetsGeometry(
map['padding'],
validate: false,
) as EdgeInsets?,
physics: ThemeDecoder.decodeScrollPhysics(
map['physics'],
validate: false,
),
primary: JsonClass.parseBool(map['primary']),
restorationId: map['restorationId'],
reverse: JsonClass.parseBool(map['reverse']),
scrollDirection: ThemeDecoder.decodeAxis(
map['scrollDirection'],
validate: false,
) ??
Axis.vertical,
shrinkWrap: JsonClass.parseBool(map['shrinkWrap']),
);
}
return result;
}