perf(neon): make RelativeTime stateful

Signed-off-by: Nikolas Rimikis <leptopoda@users.noreply.github.com>

packages/neon/neon/lib/src/utils/relative_time.dart

@@ -0,0 +1,36 @@
+import 'package:meta/meta.dart';
+
+/// Extension for formating the differnce between two [DateTime]s.
+@internal
+extension RelativeTimeFormat on DateTime {
+  /// Format the relative time between this and [to].
+  ///
+  /// If unspecified [DateTime.now] will be used.
+  String formatRelative([final DateTime? to]) {
+    final now = to ?? DateTime.now();
+    var diff = now.difference(toLocal());
+    final text = StringBuffer();
+
+    // Sometimes something can be messed up...
+    if (diff.isNegative) {
+      if (diff.inMinutes >= 1) {
+        text.write('-');
+      }
+      diff = Duration(microseconds: -diff.inMicroseconds);
+    }
+
+    if (diff.inMinutes < 1) {
+      text.write('now');
+    } else if (diff.inHours < 1) {
+      text.write('${diff.inMinutes}m');
+    } else if (diff.inDays < 1) {
+      text.write('${diff.inHours}h');
+    } else if (diff.inDays < 365) {
+      text.write('${diff.inDays}d');
+    } else {
+      text.write('${diff.inDays ~/ 365}y');
+    }
+
+    return text.toString();
+  }
+}

packages/neon/neon/lib/src/widgets/relative_time.dart

@@ -1,49 +1,52 @@
+import 'dart:async';
+
 import 'package:flutter/widgets.dart';
+import 'package:neon/src/utils/relative_time.dart';
 
-class RelativeTime extends StatelessWidget {
+/// Shows the time elapsed since a [DateTime] and periodically updates itself.
+class RelativeTime extends StatefulWidget {
+  /// Creates a new relative DateTime widget.
   const RelativeTime({
     required this.date,
     this.style,
     super.key,
   });
 
+  /// The timestamp to be displayed.
   final DateTime date;
+
+  /// The text style of the calculated time.
+  ///
+  /// If not specified the nearest [TextStyle] will be used.
   final TextStyle? style;
 
-  static String format(final DateTime date) {
+  @override
-    final now = DateTime.now();
+  State<RelativeTime> createState() => _RelativeTimeState();
-    var diff = now.difference(date.toLocal());
+}
-    final text = StringBuffer();
 
-    // Sometimes something can be messed up...
+class _RelativeTimeState extends State<RelativeTime> {
-    if (diff.isNegative) {
+  late final Timer timer;
-      if (diff.inMinutes >= 1) {
-        text.write('-');
-      }
-      diff = Duration(microseconds: -diff.inMicroseconds);
-    }
 
-    if (diff.inMinutes < 1) {
+  @override
-      text.write('now');
+  void initState() {
-    } else if (diff.inHours < 1) {
+    timer = Timer.periodic(
-      text.write('${diff.inMinutes}m');
+      const Duration(minutes: 1),
-    } else if (diff.inDays < 1) {
+      (final _) => setState(() {}),
-      text.write('${diff.inHours}h');
+    );
-    } else if (diff.inDays < 365) {
+
-      text.write('${diff.inDays}d');
+    super.initState();
-    } else {
-      text.write('${diff.inDays ~/ 365}y');
   }
 
-    return text.toString();
+  @override
+  void dispose() {
+    timer.cancel();
+
+    super.dispose();
   }
 
   @override
-  Widget build(final BuildContext context) => StreamBuilder(
+  Widget build(final BuildContext context) => Text(
-        stream: Stream.periodic(const Duration(minutes: 1)),
+        widget.date.formatRelative(),
-        builder: (final context, final _) => Text(
+        style: widget.style,
-          format(date),
-          style: style,
-        ),
       );
 }