Update Qlyra application

lib/frontend/screens/chats/chat/chat_screen_support.dart

@@ -0,0 +1,127 @@
+part of '../chat_screen.dart';
+
+class _DateSeparatorItem {
+  final DateTime date;
+  final GlobalKey key;
+  _DateSeparatorItem(this.date, this.key);
+}
+
+class _MessageItem {
+  final CachedMessage message;
+  final int index;
+  const _MessageItem(this.message, this.index);
+}
+
+class _UnreadSeparatorItem {
+  const _UnreadSeparatorItem();
+}
+
+class _FrostedPanel extends StatelessWidget {
+  final Color tint;
+  final Border? border;
+  final double sigma;
+  final BackdropKey? backdropKey;
+  final Widget child;
+
+  const _FrostedPanel({
+    required this.tint,
+    this.border,
+    this.sigma = AppFrost.panelSigma,
+    this.backdropKey,
+    required this.child,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Stack(
+      fit: StackFit.passthrough,
+      clipBehavior: Clip.none,
+      children: [
+        Positioned.fill(
+          child: GlassSurface(
+            frostTint: tint,
+            frostSigma: sigma,
+            border: border,
+            backdropKey: backdropKey,
+            child: const SizedBox.expand(),
+          ),
+        ),
+        child,
+      ],
+    );
+  }
+}
+
+class _MeasureSize extends StatefulWidget {
+  final Widget child;
+  final ValueChanged<double> onHeight;
+
+  const _MeasureSize({required this.onHeight, required this.child});
+
+  @override
+  State<_MeasureSize> createState() => _MeasureSizeState();
+}
+
+class _MeasureSizeState extends State<_MeasureSize> {
+  final GlobalKey _key = GlobalKey();
+  double _last = -1;
+
+  void _report() {
+    if (!mounted) return;
+    final height = _key.currentContext?.size?.height;
+    if (height == null) return;
+    if ((height - _last).abs() > 0.5) {
+      _last = height;
+      widget.onHeight(height);
+    }
+  }
+
+  void _scheduleReport() {
+    WidgetsBinding.instance.addPostFrameCallback((_) => _report());
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    _scheduleReport();
+    return NotificationListener<SizeChangedLayoutNotification>(
+      onNotification: (_) {
+        _scheduleReport();
+        return true;
+      },
+      child: SizeChangedLayoutNotifier(
+        child: SizedBox(key: _key, child: widget.child),
+      ),
+    );
+  }
+}
+
+class ForwardRequest {
+  final int sourceChatId;
+  final String sourceChatName;
+  final String sourceChatIconUrl;
+  final String sourceChatType;
+  final List<CachedMessage> messages;
+
+  ForwardRequest({
+    required this.sourceChatId,
+    required this.sourceChatName,
+    required this.sourceChatIconUrl,
+    required this.sourceChatType,
+    required List<CachedMessage> messages,
+  }) : messages = List.unmodifiable(messages);
+
+  ForwardRequest withMessages(List<CachedMessage> value) => ForwardRequest(
+    sourceChatId: sourceChatId,
+    sourceChatName: sourceChatName,
+    sourceChatIconUrl: sourceChatIconUrl,
+    sourceChatType: sourceChatType,
+    messages: value,
+  );
+}
+
+class ReplyRequest {
+  final int sourceChatId;
+  final CachedMessage message;
+
+  const ReplyRequest({required this.sourceChatId, required this.message});
+}