feat: add custom loader and error widget support to StacDynamicView

Author: divyanshub024

examples/stac_gallery/assets/json/dynamic_view_example.json

@@ -13,6 +13,28 @@
       "url": "https://dummyjson.com/users/1",
       "method": "get"
     },
+    "loaderWidget": {
+      "type": "center",
+      "child": {
+        "type": "column",
+        "children": [
+          {
+            "type": "text",
+            "data": "Loading..."
+          },
+          {
+            "type": "circularProgressIndicator"
+          }
+        ]
+      }
+    },
+    "errorWidget": {
+      "type": "center",
+      "child": {
+        "type": "text",
+        "data": "Error fetching user profile"
+      }
+    },
     "template": {
       "type": "column",
       "children": [

packages/stac/lib/src/parsers/widgets/stac_dynamic_view/stac_dynamic_view.dart

@@ -1,5 +1,5 @@
 import 'package:freezed_annotation/freezed_annotation.dart';
-import 'package:stac/src/parsers/actions/stac_network_request/stac_network_request.dart';
+import 'package:stac/stac.dart';
 
 export 'stac_dynamic_view_parser.dart';
 
@@ -15,6 +15,8 @@ abstract class StacDynamicView with _$StacDynamicView {
     @Default('') String targetPath,
     required Map<String, dynamic> template,
     @Default('') String resultTarget,
+    StacWidget? loaderWidget,
+    StacWidget? errorWidget,
   }) = _StacDynamicView;
 
   factory StacDynamicView.fromJson(Map<String, dynamic> json) =>

packages/stac/lib/src/parsers/widgets/stac_dynamic_view/stac_dynamic_view.freezed.dart

@@ -26,10 +26,10 @@ class StacDynamicViewParser extends StacParser<StacDynamicView> {
       future: _fetchData(context, model),
       builder: (context, snapshot) {
         if (snapshot.connectionState == ConnectionState.waiting) {
-          return const Center(child: CircularProgressIndicator());
+          return Stac.fromJson(model.loaderWidget, context) ?? const Center(child: CircularProgressIndicator());
         } else if (snapshot.hasError) {
           Log.e(snapshot.error);
-          return const SizedBox();
+          return Stac.fromJson(model.errorWidget, context) ?? const SizedBox();
         } else if (snapshot.hasData) {
           final response = snapshot.data;
           if (response != null) {
@@ -70,7 +70,7 @@ class StacDynamicViewParser extends StacParser<StacDynamicView> {
               }
             } catch (e) {
               Log.e('Error parsing API response: $e');
-              return SizedBox();
+              return Stac.fromJson(model.errorWidget, context) ?? const SizedBox();
             }
           }
           return const SizedBox();