Resolve "Add ActivityParameters widgets"

Closes #4 (closed)

lib/parameters/models/settings/settings_activity.dart

+import 'package:flutter_custom_toolbox/flutter_toolbox.dart';
+
+class ActivitySettings {
+  final Map<String, String> values;
+  final ApplicationConfigDefinition appConfig;
+
+  ActivitySettings({
+    required this.appConfig,
+    required this.values,
+  });
+
+  factory ActivitySettings.createDefault({
+    required ApplicationConfigDefinition appConfig,
+  }) {
+    Map<String, String> values = {};
+
+    for (var setting in appConfig.activitySettings) {
+      values[setting.code] = setting.defaultValue;
+    }
+
+    return ActivitySettings(
+      appConfig: appConfig,
+      values: values,
+    );
+  }
+
+  String get(String code) {
+    if (values.keys.contains(code)) {
+      if (appConfig.getFromCode(code).allowedValues.contains(values[code])) {
+        return values[code] ?? appConfig.getFromCode(code).defaultValue;
+      }
+    }
+
+    return appConfig.getFromCode(code).defaultValue;
+  }
+
+  int getAsInt(String parameterCode) {
+    final ApplicationSettingsParameter parameter = appConfig.getFromCode(parameterCode);
+
+    if (values.keys.contains(parameterCode)) {
+      if (parameter.allowedValues.contains(values[parameterCode])) {
+        if (parameter.intValueGetter != null) {
+          return parameter.intValueGetter!(get(parameterCode));
+        } else {
+          return int.parse(get(parameterCode));
+        }
+      }
+    }
+
+    if (parameter.intValueGetter != null) {
+      return parameter.intValueGetter!(parameter.defaultValue);
+    } else {
+      return int.parse(parameter.defaultValue);
+    }
+  }
+
+  void dump() {
+    printlog('$ActivitySettings:');
+    values.forEach((code, value) {
+      printlog('  $code: $value');
+    });
+    printlog('');
+  }
+
+  @override
+  String toString() {
+    return '$ActivitySettings(${toJson()})';
+  }
+
+  Map<String, dynamic>? toJson() {
+    return values;
+  }
+}