Prevent wrongly typed data from crashing program when loading

lib/widgets/nt4_widgets/multi-topic/camera_stream.dart

@@ -1,3 +1,4 @@
+import 'package:dot_cast/dot_cast.dart';
 import 'package:elastic_dashboard/services/globals.dart';
 import 'package:elastic_dashboard/services/nt4.dart';
 import 'package:elastic_dashboard/services/nt4_connection.dart';
@@ -32,8 +33,8 @@ class CameraStreamWidget extends StatelessWidget with NT4Widget {
 
   CameraStreamWidget.fromJson(
       {super.key, required Map<String, dynamic> jsonData}) {
-    topic = jsonData['topic'] ?? '';
-    period = jsonData['period'] ?? Globals.defaultPeriod;
+    topic = tryCast(jsonData['topic']) ?? '';
+    period = tryCast(jsonData['period']) ?? Globals.defaultPeriod;
 
     init();
   }
@@ -110,7 +111,8 @@ class CameraStreamWidget extends StatelessWidget with NT4Widget {
 
         rawStreams = value;
 
-        List<Object?> rawStreamsList = rawStreams as List<Object?>? ?? [];
+        List<Object?> rawStreamsList =
+            rawStreams?.tryCast<List<Object?>>() ?? [];
 
         List<String> streams = [];
         for (Object? stream in rawStreamsList) {

lib/widgets/nt4_widgets/multi-topic/combo_box_chooser.dart

@@ -1,4 +1,6 @@
+import 'package:dot_cast/dot_cast.dart';
 import 'package:dropdown_button2/dropdown_button2.dart';
+import 'package:elastic_dashboard/services/globals.dart';
 import 'package:elastic_dashboard/services/nt4.dart';
 import 'package:elastic_dashboard/services/nt4_connection.dart';
 import 'package:elastic_dashboard/widgets/nt4_widgets/nt4_widget.dart';
@@ -32,8 +34,8 @@ class ComboBoxChooser extends StatelessWidget with NT4Widget {
 
   ComboBoxChooser.fromJson(
       {super.key, required Map<String, dynamic> jsonData}) {
-    super.topic = jsonData['topic'] ?? '';
-    super.period = jsonData['period'] ?? 0.033;
+    topic = tryCast(jsonData['topic']) ?? '';
+    period = tryCast(jsonData['period']) ?? Globals.defaultPeriod;
 
     init();
   }
@@ -99,34 +101,26 @@ class ComboBoxChooser extends StatelessWidget with NT4Widget {
       stream: subscription?.periodicStream(),
       builder: (context, snapshot) {
         List<Object?> rawOptions = nt4Connection
-                .getLastAnnouncedValue(optionsTopicName) as List<Object?>? ??
+                .getLastAnnouncedValue(optionsTopicName)
+                ?.tryCast<List<Object?>>() ??
             [];
 
-        List<String> options = [];
-
-        for (Object? option in rawOptions) {
-          if (option == null || option is! String) {
-            continue;
-          }
-
-          options.add(option);
-        }
+        List<String> options = rawOptions.whereType<String>().toList();
 
         String? active =
-            nt4Connection.getLastAnnouncedValue(activeTopicName) as String?;
+            tryCast(nt4Connection.getLastAnnouncedValue(activeTopicName));
         if (active != null && active == '') {
           active = null;
         }
 
         String? selected =
-            nt4Connection.getLastAnnouncedValue(selectedTopicName) as String?;
+            tryCast(nt4Connection.getLastAnnouncedValue(selectedTopicName));
         if (selected != null && selected == '') {
           selected = null;
         }
 
         String? defaultOption =
-            nt4Connection.getLastAnnouncedValue(defaultTopicName) as String?;
-
+            tryCast(nt4Connection.getLastAnnouncedValue(defaultTopicName));
         if (defaultOption != null && defaultOption == '') {
           defaultOption = null;
         }

lib/widgets/nt4_widgets/multi-topic/command_scheduler.dart

@@ -1,3 +1,4 @@
+import 'package:dot_cast/dot_cast.dart';
 import 'package:elastic_dashboard/services/globals.dart';
 import 'package:elastic_dashboard/services/nt4.dart';
 import 'package:elastic_dashboard/services/nt4_connection.dart';
@@ -25,8 +26,8 @@ class CommandSchedulerWidget extends StatelessWidget with NT4Widget {
 
   CommandSchedulerWidget.fromJson(
       {super.key, required Map<String, dynamic> jsonData}) {
-    super.topic = jsonData['topic'] ?? '';
-    super.period = jsonData['period'] ?? Globals.defaultPeriod;
+    topic = tryCast(jsonData['topic']) ?? '';
+    period = tryCast(jsonData['period']) ?? Globals.defaultPeriod;
 
     init();
   }
@@ -53,18 +54,12 @@ class CommandSchedulerWidget extends StatelessWidget with NT4Widget {
 
   void cancelCommand(int id) {
     List<Object?> currentCancellationsRaw = nt4Connection
-            .getLastAnnouncedValue(cancelTopicName) as List<Object?>? ??
+            .getLastAnnouncedValue(cancelTopicName)
+            ?.tryCast<List<Object?>>() ??
         [];
 
-    List<int> currentCancellations = [];
-
-    for (Object? cancelID in currentCancellationsRaw) {
-      if (cancelID == null || cancelID is! int) {
-        continue;
-      }
-
-      currentCancellations.add(cancelID);
-    }
+    List<int> currentCancellations =
+        currentCancellationsRaw.whereType<int>().toList();
 
     currentCancellations.add(id);
 
@@ -86,30 +81,17 @@ class CommandSchedulerWidget extends StatelessWidget with NT4Widget {
       stream: subscription?.periodicStream(),
       builder: (context, snapshot) {
         List<Object?> rawNames = nt4Connection
-                .getLastAnnouncedValue(namesTopicName) as List<Object?>? ??
-            [];
-        List<Object?> rawIds = nt4Connection.getLastAnnouncedValue(idsTopicName)
-                as List<Object?>? ??
+                .getLastAnnouncedValue(namesTopicName)
+                ?.tryCast<List<Object?>>() ??
             [];
 
-        List<String> names = [];
-        List<int> ids = [];
-
-        for (Object? name in rawNames) {
-          if (name == null || name is! String) {
-            continue;
-          }
-
-          names.add(name);
-        }
-
-        for (Object? id in rawIds) {
-          if (id == null || id is! int) {
-            continue;
-          }
+        List<Object?> rawIds = nt4Connection
+                .getLastAnnouncedValue(idsTopicName)
+                ?.tryCast<List<Object?>>() ??
+            [];
 
-          ids.add(id);
-        }
+        List<String> names = rawNames.whereType<String>().toList();
+        List<int> ids = rawIds.whereType<int>().toList();
 
         return Column(
           mainAxisAlignment: MainAxisAlignment.start,

lib/widgets/nt4_widgets/multi-topic/command_widget.dart

@@ -1,3 +1,4 @@
+import 'package:dot_cast/dot_cast.dart';
 import 'package:elastic_dashboard/services/globals.dart';
 import 'package:elastic_dashboard/services/nt4.dart';
 import 'package:elastic_dashboard/services/nt4_connection.dart';
@@ -22,8 +23,8 @@ class CommandWidget extends StatelessWidget with NT4Widget {
   }
 
   CommandWidget.fromJson({super.key, required Map<String, dynamic> jsonData}) {
-    topic = jsonData['topic'] ?? '';
-    period = jsonData['period'] ?? '';
+    topic = tryCast(jsonData['topic']) ?? '';
+    period = tryCast(jsonData['period']) ?? Globals.defaultPeriod;
 
     init();
   }
@@ -53,12 +54,14 @@ class CommandWidget extends StatelessWidget with NT4Widget {
     return StreamBuilder(
       stream: subscription?.periodicStream(),
       builder: (context, snapshot) {
-        bool running =
-            nt4Connection.getLastAnnouncedValue(runningTopicName) as bool? ??
-                false;
-        String name =
-            nt4Connection.getLastAnnouncedValue(nameTopicName) as String? ??
-                'Unknown';
+        bool running = nt4Connection
+                .getLastAnnouncedValue(runningTopicName)
+                ?.tryCast<bool>() ??
+            false;
+        String name = nt4Connection
+                .getLastAnnouncedValue(nameTopicName)
+                ?.tryCast<String>() ??
+            'Unknown';
 
         String buttonText = topic.substring(topic.lastIndexOf('/') + 1);
 

lib/widgets/nt4_widgets/multi-topic/differential_drive.dart

@@ -1,5 +1,6 @@
 import 'dart:math';
 
+import 'package:dot_cast/dot_cast.dart';
 import 'package:elastic_dashboard/services/globals.dart';
 import 'package:elastic_dashboard/services/nt4.dart';
 import 'package:elastic_dashboard/services/nt4_connection.dart';
@@ -36,8 +37,8 @@ class DifferentialDrive extends StatelessWidget with NT4Widget {
 
   DifferentialDrive.fromJson(
       {super.key, required Map<String, dynamic> jsonData}) {
-    super.topic = jsonData['topic'] ?? '';
-    super.period = jsonData['period'] ?? Globals.defaultPeriod;
+    topic = tryCast(jsonData['topic']) ?? '';
+    period = tryCast(jsonData['period']) ?? Globals.defaultPeriod;
 
     init();
   }
@@ -73,10 +74,12 @@ class DifferentialDrive extends StatelessWidget with NT4Widget {
       stream: subscription?.periodicStream(),
       builder: (context, snapshot) {
         double leftSpeed = nt4Connection
-                .getLastAnnouncedValue(leftSpeedTopicName) as double? ??
+                .getLastAnnouncedValue(leftSpeedTopicName)
+                ?.tryCast<double>() ??
             0.0;
         double rightSpeed = nt4Connection
-                .getLastAnnouncedValue(rightSpeedTopicName) as double? ??
+                .getLastAnnouncedValue(rightSpeedTopicName)
+                ?.tryCast<double>() ??
             0.0;
 
         if (leftSpeed != leftSpeedPreviousValue) {

lib/widgets/nt4_widgets/multi-topic/field_widget.dart

@@ -1,5 +1,6 @@
 import 'dart:math';
 
+import 'package:dot_cast/dot_cast.dart';
 import 'package:elastic_dashboard/services/field_images.dart';
 import 'package:elastic_dashboard/services/globals.dart';
 import 'package:elastic_dashboard/services/nt4.dart';
@@ -52,16 +53,16 @@ class FieldWidget extends StatelessWidget with NT4Widget {
   }
 
   FieldWidget.fromJson({super.key, required Map<String, dynamic> jsonData}) {
-    super.topic = jsonData['topic'] ?? '';
-    super.period = jsonData['period'] ?? Globals.defaultPeriod;
+    topic = tryCast(jsonData['topic']) ?? '';
+    period = tryCast(jsonData['period']) ?? Globals.defaultPeriod;
 
-    fieldGame = jsonData['field_game'] ?? fieldGame;
+    fieldGame = tryCast(jsonData['field_game']) ?? fieldGame;
 
-    robotWidthMeters = jsonData['robot_width'] ?? 0.82;
-    robotLengthMeters = jsonData['robot_length'] ?? 1.00;
+    robotWidthMeters = tryCast(jsonData['robot_width']) ?? 0.82;
+    robotLengthMeters = tryCast(jsonData['robot_length']) ?? 1.00;
 
-    showOtherObjects = jsonData['show_other_objects'] ?? true;
-    showTrajectories = jsonData['show_trajectories'] ?? true;
+    showOtherObjects = tryCast(jsonData['show_other_objects']) ?? true;
+    showTrajectories = tryCast(jsonData['show_trajectories']) ?? true;
 
     init();
   }
@@ -332,7 +333,8 @@ class FieldWidget extends StatelessWidget with NT4Widget {
         }
 
         List<Object?> robotPositionRaw = nt4Connection
-                .getLastAnnouncedValue(robotTopicName) as List<Object?>? ??
+                .getLastAnnouncedValue(robotTopicName)
+                ?.tryCast<List<Object?>>() ??
             [];
 
         List<double>? robotPosition = [];
@@ -374,7 +376,8 @@ class FieldWidget extends StatelessWidget with NT4Widget {
         if (showOtherObjects || showTrajectories) {
           for (String objectTopic in otherObjectTopics) {
             List<Object?>? objectPositionRaw = nt4Connection
-                .getLastAnnouncedValue(objectTopic) as List<Object?>?;
+                .getLastAnnouncedValue(objectTopic)
+                ?.tryCast<List<Object?>>();
 
             if (objectPositionRaw == null) {
               continue;

lib/widgets/nt4_widgets/multi-topic/fms_info.dart

@@ -1,3 +1,4 @@
+import 'package:dot_cast/dot_cast.dart';
 import 'package:elastic_dashboard/services/globals.dart';
 import 'package:elastic_dashboard/services/nt4_connection.dart';
 import 'package:elastic_dashboard/widgets/nt4_widgets/nt4_widget.dart';
@@ -32,8 +33,8 @@ class FMSInfo extends StatelessWidget with NT4Widget {
   }
 
   FMSInfo.fromJson({super.key, required Map<String, dynamic> jsonData}) {
-    super.topic = jsonData['topic'] ?? '';
-    super.period = jsonData['period'] ?? Globals.defaultPeriod;
+    topic = tryCast(jsonData['topic']) ?? '/FMSInfo';
+    period = tryCast(jsonData['period']) ?? Globals.defaultPeriod;
 
     init();
   }
@@ -89,18 +90,19 @@ class FMSInfo extends StatelessWidget with NT4Widget {
       stream: subscription?.periodicStream(),
       builder: (context, snapshot) {
         String eventName =
-            nt4Connection.getLastAnnouncedValue(eventNameTopic) as String? ??
-                '';
+            tryCast(nt4Connection.getLastAnnouncedValue(eventNameTopic)) ?? '';
         int controlData =
-            nt4Connection.getLastAnnouncedValue(controlDataTopic) as int? ?? 32;
+            tryCast(nt4Connection.getLastAnnouncedValue(controlDataTopic)) ??
+                32;
         bool redAlliance =
-            nt4Connection.getLastAnnouncedValue(allianceTopic) as bool? ?? true;
+            tryCast(nt4Connection.getLastAnnouncedValue(allianceTopic)) ?? true;
         int matchNumber =
-            nt4Connection.getLastAnnouncedValue(matchNumberTopic) as int? ?? 0;
+            tryCast(nt4Connection.getLastAnnouncedValue(matchNumberTopic)) ?? 0;
         int matchType =
-            nt4Connection.getLastAnnouncedValue(matchTypeTopic) as int? ?? 0;
+            tryCast(nt4Connection.getLastAnnouncedValue(matchTypeTopic)) ?? 0;
         int replayNumber =
-            nt4Connection.getLastAnnouncedValue(replayNumberTopic) as int? ?? 0;
+            tryCast(nt4Connection.getLastAnnouncedValue(replayNumberTopic)) ??
+                0;
 
         String eventNameDisplay = '$eventName${(eventName != '') ? ' ' : ''}';
         String matchTypeString = _getMatchTypeString(matchType);

lib/widgets/nt4_widgets/multi-topic/gyro.dart

@@ -1,3 +1,4 @@
+import 'package:dot_cast/dot_cast.dart';
 import 'package:elastic_dashboard/services/globals.dart';
 import 'package:elastic_dashboard/services/nt4.dart';
 import 'package:elastic_dashboard/services/nt4_connection.dart';
@@ -34,9 +35,10 @@ class Gyro extends StatelessWidget with NT4Widget {
   }
 
   Gyro.fromJson({super.key, required Map<String, dynamic> jsonData}) {
-    super.topic = jsonData['topic'] ?? '';
-    super.period = jsonData['period'] ?? Globals.defaultPeriod;
-    counterClockwisePositive = jsonData['counter_clockwise_positive'] ?? false;
+    topic = tryCast(jsonData['topic']) ?? '';
+    period = tryCast(jsonData['period']) ?? Globals.defaultPeriod;
+    counterClockwisePositive =
+        tryCast(jsonData['counter_clockwise_positive']) ?? false;
 
     init();
   }
@@ -109,7 +111,7 @@ class Gyro extends StatelessWidget with NT4Widget {
       stream: valueSubscription.periodicStream(),
       initialData: nt4Connection.getLastAnnouncedValue(valueTopic),
       builder: (context, snapshot) {
-        double value = (snapshot.data as double?) ?? 0.0;
+        double value = tryCast(snapshot.data) ?? 0.0;
 
         if (counterClockwisePositive) {
           value *= -1;