runable

lib/core/constants/app_constants.dart

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+/// Application-wide constants
+class AppConstants {
+  // Private constructor to prevent instantiation
+  AppConstants._();
+
+  // API Configuration
+  static const String apiBaseUrl = 'https://api.example.com'; // Replace with actual API base URL
+  static const String apiVersion = 'v1';
+  static const String scansEndpoint = '/api/scans';
+
+  // Network Timeouts (in milliseconds)
+  static const int connectionTimeout = 30000; // 30 seconds
+  static const int receiveTimeout = 30000; // 30 seconds
+  static const int sendTimeout = 30000; // 30 seconds
+
+  // Local Storage Keys
+  static const String scanHistoryBox = 'scan_history';
+  static const String settingsBox = 'settings';
+  static const String userPreferencesKey = 'user_preferences';
+
+  // Scanner Configuration
+  static const List<String> supportedBarcodeFormats = [
+    'CODE_128',
+    'CODE_39',
+    'CODE_93',
+    'EAN_13',
+    'EAN_8',
+    'UPC_A',
+    'UPC_E',
+    'QR_CODE',
+    'DATA_MATRIX',
+  ];
+
+  // UI Configuration
+  static const int maxHistoryItems = 100;
+  static const int scanResultDisplayDuration = 3; // seconds
+
+  // Form Field Labels
+  static const String field1Label = 'Field 1';
+  static const String field2Label = 'Field 2';
+  static const String field3Label = 'Field 3';
+  static const String field4Label = 'Field 4';
+
+  // Error Messages
+  static const String networkErrorMessage = 'Network error occurred. Please check your connection.';
+  static const String serverErrorMessage = 'Server error occurred. Please try again later.';
+  static const String unknownErrorMessage = 'An unexpected error occurred.';
+  static const String noDataMessage = 'No data available';
+  static const String scannerPermissionMessage = 'Camera permission is required to scan barcodes.';
+
+  // Success Messages
+  static const String saveSuccessMessage = 'Data saved successfully!';
+  static const String printSuccessMessage = 'Print job completed successfully!';
+
+  // App Info
+  static const String appName = 'Barcode Scanner';
+  static const String appVersion = '1.0.0';
+  static const String appDescription = 'Simple barcode scanner with form data entry';
+
+  // Animation Durations
+  static const Duration shortAnimationDuration = Duration(milliseconds: 200);
+  static const Duration mediumAnimationDuration = Duration(milliseconds: 400);
+  static const Duration longAnimationDuration = Duration(milliseconds: 600);
+
+  // Spacing and Sizes
+  static const double defaultPadding = 16.0;
+  static const double smallPadding = 8.0;
+  static const double largePadding = 24.0;
+  static const double borderRadius = 8.0;
+  static const double buttonHeight = 48.0;
+  static const double textFieldHeight = 56.0;
+
+  // Scanner View Configuration
+  static const double scannerAspectRatio = 1.0;
+  static const double scannerBorderWidth = 2.0;
+
+  // Print Configuration
+  static const String printJobName = 'Barcode Scan Data';
+  static const double printPageMargin = 72.0; // 1 inch in points
+}