feat:增加加载中组件

lib/widgets/common/index.dart

@@ -29,7 +29,9 @@ InputDecoration formInputDecoration({
 }
 
 Widget buildCard({required BuildContext context, required Widget child}) {
-  final colors = Theme.of(context).colorScheme;
+  final colors = Theme
+      .of(context)
+      .colorScheme;
   return Card(
     elevation: 0,
     shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
@@ -64,7 +66,11 @@ Widget buildToggleSwitch<T extends Enum>({
     initialLabelIndex: tabValues.indexOf(currentTab),
     totalSwitches: tabValues.length,
     labels: labels,
-    activeBgColor: [Theme.of(context).colorScheme.primary],
+    activeBgColor: [Theme
+        .of(context)
+        .colorScheme
+        .primary
+    ],
     activeFgColor: Colors.white,
     inactiveBgColor: Colors.grey.shade200,
     inactiveFgColor: Colors.grey.shade700,
@@ -93,7 +99,10 @@ Widget circleIconButton({
       fixedSize: Size(size, size),
       shape: CircleBorder(),
       elevation: 0,
-      backgroundColor: Theme.of(context).colorScheme.primary,
+      backgroundColor: Theme
+          .of(context)
+          .colorScheme
+          .primary,
       padding: EdgeInsets.zero,
       minimumSize: const Size(0, 0),
     ),
@@ -102,7 +111,9 @@ Widget circleIconButton({
 }
 
 Widget buildTag(BuildContext context, String title) {
-  final colors = Theme.of(context).colorScheme;
+  final colors = Theme
+      .of(context)
+      .colorScheme;
 
   return Container(
     padding: EdgeInsets.symmetric(horizontal: 10, vertical: 4),
@@ -173,3 +184,41 @@ void showErrorToast(String message) {
     fontSize: 16.0,
   );
 }
+
+Widget buildLoadingIndicator(BuildContext context) {
+  final colors = Theme.of(context).colorScheme;
+
+  return Center(
+    child: Container(
+      padding: EdgeInsets.all(16),
+      decoration: BoxDecoration(
+        color: colors.surface,
+        borderRadius: BorderRadius.circular(12),
+        boxShadow: [
+          BoxShadow(
+            color: Colors.black12,
+            blurRadius: 8,
+            offset: Offset(0, 2),
+          ),
+        ],
+      ),
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          CircularProgressIndicator(
+            valueColor: AlwaysStoppedAnimation<Color>(colors.primary),
+          ),
+          SizedBox(height: 12),
+          Text(
+            '加载中',
+            style: TextStyle(
+              fontSize: 14,
+              color: colors.onSurface,
+              fontWeight: FontWeight.w500,
+            ),
+          ),
+        ],
+      ),
+    ),
+  );
+}