fix: add loading indicator on creating post

packages/flutter_timeline/lib/src/models/timeline_options.dart

@@ -134,6 +134,7 @@ Widget _defaultButtonBuilder({
   required String title,
   required Function() onPressed,
   required BuildContext context,
+  required bool loading,
 }) {
   var theme = Theme.of(context);
   return SafeArea(
@@ -145,7 +146,14 @@ Widget _defaultButtonBuilder({
           minimumSize: const Size(254, 50),
         ),
         onPressed: onPressed,
-        child: Text(
+        child: loading
+            ? Padding(
+                padding: const EdgeInsets.symmetric(vertical: 8),
+                child: CircularProgressIndicator(
+                  color: theme.textTheme.displayLarge?.color,
+                ),
+              )
+            : Text(
                 title,
                 style: theme.textTheme.displayLarge,
               ),
@@ -179,6 +187,7 @@ typedef ButtonBuilder = Widget Function({
   required String title,
   required Function() onPressed,
   required BuildContext context,
+  required bool loading,
 });
 
 typedef PostBuilder = Widget Function({

packages/flutter_timeline/lib/src/screens/timeline_add_post_information_screen.dart

@@ -195,6 +195,7 @@ class _TimelineAddPostInformationScreenState
                     widget.onTapOverview();
                   },
                   context: context,
+                  loading: false,
                 ),
               ],
             ),

packages/flutter_timeline/lib/src/screens/timeline_choose_category_screen.dart

@@ -100,6 +100,7 @@ class TimelineChooseCategoryScreen extends StatelessWidget {
                                           if (context.mounted)
                                             Navigator.of(context).pop();
                                         },
+                                        loading: false,
                                       ),
                                     ),
                                     TextButton(

packages/flutter_timeline/lib/src/screens/timeline_post_overview.dart

@@ -19,6 +19,7 @@ class TimelinePostOverview extends StatefulWidget {
 
 class _TimelinePostOverviewState extends State<TimelinePostOverview> {
   bool isLoading = false;
+
   @override
   Widget build(BuildContext context) {
     var currentPost = widget.timelineService.getCurrentPost();
@@ -59,12 +60,16 @@ class _TimelinePostOverviewState extends State<TimelinePostOverview> {
                   title: widget.options.translations.postButtonTitle,
                   onPressed: () async {
                     if (isLoading) return;
+                    setState(() {
                       isLoading = true;
+                    });
+
                     await widget.timelineService.createPost(currentPost);
                     widget.options.onCreatePost?.call(currentPost);
                     widget.onTapCreatePost(currentPost);
                   },
                   context: context,
+                  loading: isLoading,
                 ),
               ],
             ),