fromJson static method

PreviewCanvas? fromJson(Object? raw)

Reads back what toJson wrote.

An id this build has no device for is dropped, not refused. This is read on the way to drawing something rather than while checking a command line, and the config is written against the flutterware the project pins — which can run ahead of the GUI reading its manifest. A device we cannot resolve has to mean a canvas with fewer devices, never a panel that will not open.

Implementation

static PreviewCanvas? fromJson(Object? raw) {
  if (raw is! Map) return null;
  var prefix = raw['prefix'];
  if (prefix is! String) return null;
  return PreviewCanvas(
    prefix,
    devices: [
      for (var id in (raw['devices'] as List? ?? const []))
        if (id is String) ?deviceById(id),
    ],
    orientations: [
      for (var name in (raw['orientations'] as List? ?? const []))
        if (name is String) ?orientationById(name),
    ],
    keyboards: [
      for (var name in (raw['keyboards'] as List? ?? const []))
        if (name is String) ?keyboardModeById(name),
    ],
  );
}