Merge pull request #246 from Specter242/codex/signal-ui-consistency

Unify signal indicator UI across RSSI and SNR

lib/widgets/device_tile.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_blue_plus/flutter_blue_plus.dart';
 import '../l10n/l10n.dart';
+import 'signal_ui.dart';
 
 /// A reusable tile widget for displaying a MeshCore device in a list
 class DeviceTile extends StatelessWidget {
@@ -33,28 +34,25 @@ class DeviceTile extends StatelessWidget {
   }
 
   Widget _buildSignalIcon(int rssi) {
-    IconData icon;
+    final tier = rssi >= -60
-    Color color;
+        ? 0
-
+        : rssi >= -70
-    if (rssi >= -60) {
+        ? 1
-      icon = Icons.signal_cellular_4_bar;
+        : rssi >= -80
-      color = Colors.green;
+        ? 2
-    } else if (rssi >= -70) {
+        : rssi >= -90
-      icon = Icons.signal_cellular_alt;
+        ? 3
-      color = Colors.lightGreen;
+        : 4;
-    } else if (rssi >= -80) {
+    final signalUi = signalUiForStrengthTier(tier);
-      icon = Icons.signal_cellular_alt_2_bar;
-      color = Colors.orange;
-    } else {
-      icon = Icons.signal_cellular_alt_1_bar;
-      color = Colors.red;
-    }
 
     return Column(
       mainAxisAlignment: MainAxisAlignment.center,
       children: [
-        Icon(icon, color: color),
+        Icon(signalUi.icon, color: signalUi.color),
-        Text('$rssi dBm', style: TextStyle(fontSize: 10, color: color)),
+        Text(
+          '$rssi dBm',
+          style: TextStyle(fontSize: 10, color: signalUi.color),
+        ),
       ],
     );
   }

lib/widgets/signal_ui.dart

@@ -0,0 +1,38 @@
+import 'package:flutter/material.dart';
+
+class SignalUi {
+  final IconData icon;
+  final Color color;
+
+  const SignalUi({required this.icon, required this.color});
+}
+
+SignalUi signalUiForStrengthTier(int tier) {
+  switch (tier) {
+    case 0:
+      return const SignalUi(
+        icon: Icons.signal_cellular_4_bar,
+        color: Colors.green,
+      );
+    case 1:
+      return const SignalUi(
+        icon: Icons.signal_cellular_alt,
+        color: Colors.lightGreen,
+      );
+    case 2:
+      return const SignalUi(
+        icon: Icons.signal_cellular_alt_2_bar,
+        color: Colors.amber,
+      );
+    case 3:
+      return const SignalUi(
+        icon: Icons.signal_cellular_alt_1_bar,
+        color: Colors.orange,
+      );
+    default:
+      return const SignalUi(
+        icon: Icons.signal_cellular_alt_1_bar,
+        color: Colors.red,
+      );
+  }
+}

lib/widgets/snr_indicator.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import '../connector/meshcore_connector.dart';
 import '../l10n/l10n.dart';
+import 'signal_ui.dart';
 
 class SNRUi {
   final IconData icon;
@@ -38,28 +39,19 @@ SNRUi snrUiFromSNR(double? snr, int? spreadingFactor) {
 
   final snrLevels = getSNRfromSF(spreadingFactor);
 
-  IconData icon;
-  Color color;
   String text = '${snr.toStringAsFixed(1)} dB';
+  final tier = snr >= snrLevels[0]
+      ? 0
+      : snr >= snrLevels[1]
+      ? 1
+      : snr >= snrLevels[2]
+      ? 2
+      : snr >= snrLevels[3]
+      ? 3
+      : 4;
+  final signalUi = signalUiForStrengthTier(tier);
 
-  if (snr >= snrLevels[0]) {
+  return SNRUi(signalUi.icon, signalUi.color, text);
-    icon = Icons.signal_cellular_alt;
-    color = Colors.green;
-  } else if (snr >= snrLevels[1]) {
-    icon = Icons.signal_cellular_alt;
-    color = Colors.lightGreen;
-  } else if (snr >= snrLevels[2]) {
-    icon = Icons.signal_cellular_alt;
-    color = Colors.yellow;
-  } else if (snr >= snrLevels[3]) {
-    icon = Icons.signal_cellular_alt_2_bar;
-    color = Colors.orange;
-  } else {
-    icon = Icons.signal_cellular_alt_1_bar;
-    color = Colors.red;
-  }
-
-  return SNRUi(icon, color, text);
 }
 
 class SNRIndicator extends StatefulWidget {