29 lines
911 B
Dart
29 lines
911 B
Dart
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// One signal's current state as a display needs it: value, and whether to draw it dim
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// (missing, stale or known-without-value; app guideline 2).
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import 'boundary.dart';
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/// One signal's current state, as the dash needs it.
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class Reading {
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const Reading(this.value, {this.dim = false});
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/// The value, or null when missing or known-without-value.
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final Object? value;
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/// Missing or stale: drawn in subdued.
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final bool dim;
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static Reading of(Boundary b, String name) {
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final e = b.signals[name];
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if (e is! Map) return const Reading(null, dim: true);
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final q = e['quality'] as String? ?? 'ok';
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return Reading(e['value'], dim: q != 'ok' || e['value'] == null);
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}
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double? get number => value is num ? (value as num).toDouble() : null;
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bool get on => value == true;
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String fixed([int decimals = 0]) =>
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number == null ? '—' : number!.toStringAsFixed(decimals);
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}
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