refactor: Structure files in more directories

lib/widgets/event_content/state_message.dart

@@ -0,0 +1,67 @@
+import 'package:famedlysdk/famedlysdk.dart';
+import 'package:fluffychat/utils/matrix_sdk_extensions.dart/matrix_locals.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_gen/gen_l10n/l10n.dart';
+
+import '../../config/app_config.dart';
+
+class StateMessage extends StatelessWidget {
+  final Event event;
+  final void Function(String) unfold;
+  const StateMessage(this.event, {@required this.unfold});
+
+  @override
+  Widget build(BuildContext context) {
+    if (event.unsigned['im.fluffychat.collapsed_state_event'] == true) {
+      return Container();
+    }
+    final int counter =
+        event.unsigned['im.fluffychat.collapsed_state_event_count'] ?? 0;
+    return Padding(
+      padding: const EdgeInsets.symmetric(
+        horizontal: 8.0,
+        vertical: 4.0,
+      ),
+      child: Center(
+        child: InkWell(
+          onTap: counter != 0 ? () => unfold(event.eventId) : null,
+          borderRadius: BorderRadius.circular(AppConfig.borderRadius),
+          child: Container(
+            padding: const EdgeInsets.all(8),
+            decoration: BoxDecoration(
+              border: Border.all(
+                color: Theme.of(context).dividerColor,
+              ),
+              borderRadius: BorderRadius.circular(AppConfig.borderRadius),
+            ),
+            child: Column(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                Text(
+                  event.getLocalizedBody(MatrixLocals(L10n.of(context))),
+                  textAlign: TextAlign.center,
+                  style: TextStyle(
+                    fontSize: Theme.of(context).textTheme.bodyText1.fontSize *
+                        AppConfig.fontSizeFactor,
+                    color: Theme.of(context).textTheme.bodyText2.color,
+                    decoration:
+                        event.redacted ? TextDecoration.lineThrough : null,
+                  ),
+                ),
+                if (counter != 0)
+                  Text(
+                    counter == 1
+                        ? L10n.of(context).oneMoreEvent
+                        : L10n.of(context).xMoreEvents(counter.toString()),
+                    style: TextStyle(
+                      fontWeight: FontWeight.bold,
+                    ),
+                  ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}