Improve subdomain notation, fix error catching for xyz in tile URL

lib/localizations/de.json

@@ -235,7 +235,7 @@
     "urlTemplate": "URL-Vorlage",
     "urlTemplateHint": "https://beispiel.com/{z}/{x}/{y}.png",
     "urlTemplateRequired": "URL-Vorlage ist erforderlich",
-    "urlTemplatePlaceholders": "URL muss {z}, {x} und {y} Platzhalter enthalten",
+    "urlTemplatePlaceholders": "URL muss entweder {quadkey} oder {z}, {x} und {y} Platzhalter enthalten",
     "attribution": "Zuschreibung",
     "attributionHint": "© Karten-Anbieter",
     "attributionRequired": "Zuschreibung ist erforderlich",

lib/localizations/en.json

@@ -267,7 +267,7 @@
     "urlTemplate": "URL Template",
     "urlTemplateHint": "https://example.com/{z}/{x}/{y}.png",
     "urlTemplateRequired": "URL template is required",
-    "urlTemplatePlaceholders": "URL must contain {z}, {x}, and {y} placeholders",
+    "urlTemplatePlaceholders": "URL must contain either {quadkey} or {z}, {x}, and {y} placeholders",
     "attribution": "Attribution",
     "attributionHint": "© Map Provider",
     "attributionRequired": "Attribution is required",

lib/localizations/es.json

@@ -267,7 +267,7 @@
     "urlTemplate": "Plantilla de URL",
     "urlTemplateHint": "https://ejemplo.com/{z}/{x}/{y}.png",
     "urlTemplateRequired": "La plantilla de URL es requerida",
-    "urlTemplatePlaceholders": "La URL debe contener marcadores {z}, {x} y {y}",
+    "urlTemplatePlaceholders": "La URL debe contener marcadores {quadkey} o {z}, {x} y {y}",
     "attribution": "Atribución",
     "attributionHint": "© Proveedor de Mapas",
     "attributionRequired": "La atribución es requerida",

lib/localizations/fr.json

@@ -267,7 +267,7 @@
     "urlTemplate": "Modèle d'URL",
     "urlTemplateHint": "https://exemple.com/{z}/{x}/{y}.png",
     "urlTemplateRequired": "Le modèle d'URL est requis",
-    "urlTemplatePlaceholders": "L'URL doit contenir les marqueurs {z}, {x} et {y}",
+    "urlTemplatePlaceholders": "L'URL doit contenir soit {quadkey} soit les marqueurs {z}, {x} et {y}",
     "attribution": "Attribution",
     "attributionHint": "© Fournisseur de Cartes",
     "attributionRequired": "L'attribution est requise",

lib/localizations/it.json

@@ -267,7 +267,7 @@
     "urlTemplate": "Template URL",
     "urlTemplateHint": "https://esempio.com/{z}/{x}/{y}.png",
     "urlTemplateRequired": "Il template URL è obbligatorio",
-    "urlTemplatePlaceholders": "L'URL deve contenere i segnaposto {z}, {x} e {y}",
+    "urlTemplatePlaceholders": "L'URL deve contenere o {quadkey} o i segnaposto {z}, {x} e {y}",
     "attribution": "Attribuzione",
     "attributionHint": "© Fornitore Mappe",
     "attributionRequired": "L'attribuzione è obbligatoria",

lib/localizations/pt.json

@@ -267,7 +267,7 @@
     "urlTemplate": "Modelo de URL",
     "urlTemplateHint": "https://exemplo.com/{z}/{x}/{y}.png",
     "urlTemplateRequired": "Modelo de URL é obrigatório",
-    "urlTemplatePlaceholders": "URL deve conter os marcadores {z}, {x} e {y}",
+    "urlTemplatePlaceholders": "URL deve conter {quadkey} ou os marcadores {z}, {x} e {y}",
     "attribution": "Atribuição",
     "attributionHint": "© Provedor de Mapas",
     "attributionRequired": "Atribuição é obrigatória",

lib/localizations/zh.json

@@ -267,7 +267,7 @@
     "urlTemplate": "URL 模板",
     "urlTemplateHint": "https://example.com/{z}/{x}/{y}.png",
     "urlTemplateRequired": "URL 模板为必填项",
-    "urlTemplatePlaceholders": "URL 必须包含 {z}、{x} 和 {y} 占位符",
+    "urlTemplatePlaceholders": "URL 必须包含 {quadkey} 或 {z}、{x} 和 {y} 占位符",
     "attribution": "归属",
     "attributionHint": "© 地图提供商",
     "attributionRequired": "归属为必填项",

lib/models/tile_provider.dart

@@ -20,6 +20,13 @@ class TileType {
   });
 
   /// Create URL for a specific tile, replacing template variables
+  /// 
+  /// Supported placeholders:
+  /// - {x}, {y}, {z}: Standard tile coordinates
+  /// - {quadkey}: Bing Maps quadkey format (alternative to x/y/z)
+  /// - {0_3}: Subdomain 0-3 for load balancing
+  /// - {1_4}: Subdomain 1-4 for providers that use 1-based indexing
+  /// - {api_key}: API key placeholder (optional)
   String getTileUrl(int z, int x, int y, {String? apiKey}) {
     String url = urlTemplate;
     
@@ -29,10 +36,15 @@ class TileType {
       url = url.replaceAll('{quadkey}', quadkey);
     }
     
-    // Handle subdomains (for Bing Maps and other multi-subdomain providers)
-    if (url.contains('{subdomain}')) {
-      final subdomain = (x + y) % 4; // Distribute across 0-3 subdomains
-      url = url.replaceAll('{subdomain}', subdomain.toString());
+    // Handle subdomains for load balancing
+    if (url.contains('{0_3}')) {
+      final subdomain = (x + y) % 4; // 0, 1, 2, 3
+      url = url.replaceAll('{0_3}', subdomain.toString());
+    }
+    
+    if (url.contains('{1_4}')) {
+      final subdomain = ((x + y) % 4) + 1; // 1, 2, 3, 4
+      url = url.replaceAll('{1_4}', subdomain.toString());
     }
     
     // Standard x/y/z replacement
@@ -196,7 +208,7 @@ class DefaultTileProviders {
           TileType(
             id: 'bing_satellite',
             name: 'Satellite',
-            urlTemplate: 'https://ecn.t{subdomain}.tiles.virtualearth.net/tiles/a{quadkey}.jpeg?g=1&n=z',
+            urlTemplate: 'https://ecn.t{0_3}.tiles.virtualearth.net/tiles/a{quadkey}.jpeg?g=1&n=z',
             attribution: '© Microsoft Corporation',
             maxZoom: 20,
           ),

lib/screens/tile_provider_editor_screen.dart

@@ -318,9 +318,15 @@ class _TileTypeDialogState extends State<_TileTypeDialog> {
                     ),
                     validator: (value) {
                       if (value?.trim().isEmpty == true) return locService.t('tileTypeEditor.urlTemplateRequired');
-                      if (!value!.contains('{z}') || !value.contains('{x}') || !value.contains('{y}')) {
+                      
+                      // Check for either quadkey OR x+y+z placeholders
+                      final hasQuadkey = value!.contains('{quadkey}');
+                      final hasXYZ = value.contains('{x}') && value.contains('{y}') && value.contains('{z}');
+                      
+                      if (!hasQuadkey && !hasXYZ) {
                         return locService.t('tileTypeEditor.urlTemplatePlaceholders');
                       }
+                      
                       return null;
                     },
                   ),
@@ -403,11 +409,20 @@ class _TileTypeDialogState extends State<_TileTypeDialog> {
     });
 
     try {
-      // Use a sample tile from configured preview location
-      final url = _urlController.text
-          .replaceAll('{z}', kPreviewTileZoom.toString())
-          .replaceAll('{x}', kPreviewTileX.toString())
-          .replaceAll('{y}', kPreviewTileY.toString());
+      // Create a temporary TileType to use the getTileUrl method
+      final tempTileType = TileType(
+        id: 'preview',
+        name: 'Preview',
+        urlTemplate: _urlController.text.trim(),
+        attribution: 'Preview',
+      );
+      
+      final url = tempTileType.getTileUrl(
+        kPreviewTileZoom,
+        kPreviewTileX,
+        kPreviewTileY,
+        apiKey: null, // Don't use API key for preview
+      );
       
       final response = await http.get(Uri.parse(url));