opt: оптимизация анимоджи при октрытии панели и заходе в чат

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

@@ -14,6 +14,7 @@ class StickerPanelController {
       duration: const Duration(milliseconds: 240),
       reverseDuration: const Duration(milliseconds: 200),
     );
+    anim.addStatusListener(_onAnimStatus);
     showPanel.addListener(_onToggle);
   }
 
@@ -21,11 +22,17 @@ class StickerPanelController {
 
   late final AnimationController anim;
   final ValueNotifier<bool> showPanel = ValueNotifier(false);
+  final ValueNotifier<bool> panelHold = ValueNotifier(true);
   double panelHeight = 300;
   Timer? _typingTimer;
 
   void hide() => showPanel.value = false;
 
+  void _onAnimStatus(AnimationStatus status) {
+    final held = status != AnimationStatus.completed;
+    if (panelHold.value != held) panelHold.value = held;
+  }
+
   void _onToggle() {
     if (showPanel.value) {
       anim.forward();
@@ -50,7 +57,9 @@ class StickerPanelController {
   void dispose() {
     _typingTimer?.cancel();
     showPanel.removeListener(_onToggle);
+    anim.removeStatusListener(_onAnimStatus);
     anim.dispose();
     showPanel.dispose();
+    panelHold.dispose();
   }
 }

lib/frontend/screens/chats/chat/view/sticker_panel_view.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 
 import 'package:komet/frontend/screens/chats/chat/sticker_panel_controller.dart';
+import 'package:komet/frontend/widgets/lottie_image.dart';
 import 'package:komet/frontend/widgets/sticker_panel.dart';
 import 'package:komet/models/animoji.dart';
 import 'package:komet/models/sticker.dart';
@@ -21,10 +22,13 @@ class StickerPanelView extends StatelessWidget {
   Widget build(BuildContext context) {
     return AnimatedBuilder(
       animation: stickers.anim,
-      child: StickerPanel(
-        height: stickers.panelHeight,
-        onStickerTap: onStickerTap,
-        onEmojiTap: onEmojiTap,
+      child: LottieHoldScope(
+        isHeld: stickers.panelHold,
+        child: StickerPanel(
+          height: stickers.panelHeight,
+          onStickerTap: onStickerTap,
+          onEmojiTap: onEmojiTap,
+        ),
       ),
       builder: (context, child) {
         final t = Curves.easeOutCubic.transform(

lib/frontend/screens/chats/chat_screen.dart

@@ -79,6 +79,7 @@ import '../../widgets/confirm_dialog.dart';
 import '../../widgets/connection_status.dart';
 import '../../widgets/message_bubble.dart';
 import '../../widgets/message_actions_overlay.dart';
+import '../../widgets/lottie_image.dart';
 import '../../widgets/attachment_panel.dart';
 import '../../widgets/attachment/attachment_sheet.dart';
 import '../../widgets/sticker_pack_sheet.dart';
@@ -465,6 +466,7 @@ class _ChatScreenState extends State<ChatScreen>
   final Map<int, GlobalKey> _separatorKeys = {};
   String? _lastSentId;
   final ValueNotifier<int> _otherUnread = ValueNotifier(0);
+  final ValueNotifier<bool> _animojiHold = ValueNotifier(true);
 
   final ValueNotifier<Set<String>> _selectedIds = ValueNotifier(const {});
   late final AnimationController _selectionAnim;
@@ -740,6 +742,7 @@ class _ChatScreenState extends State<ChatScreen>
   }
 
   void _kickoffHistory() {
+    _animojiHold.value = false;
     if (_historyKickedOff) return;
     _historyKickedOff = true;
     _shimmerStartTimer = Timer(const Duration(milliseconds: 150), () {
@@ -1312,6 +1315,7 @@ class _ChatScreenState extends State<ChatScreen>
     WidgetsBinding.instance.removeObserver(this);
     chats.chatsChanged.removeListener(_onChatsBump);
     _otherUnread.dispose();
+    _animojiHold.dispose();
     _saveDraft();
     _messageController.removeListener(_onTextChanged);
     _scrollController.removeListener(_onScrollForDate);
@@ -3990,7 +3994,10 @@ class _ChatScreenState extends State<ChatScreen>
               ),
               child: AnimatedBuilder(
                 animation: _searchAnim,
-                child: underlap ? _buildUnderlapBody() : _buildColorBody(),
+                child: LottieHoldScope(
+                  isHeld: _animojiHold,
+                  child: underlap ? _buildUnderlapBody() : _buildColorBody(),
+                ),
                 builder: (context, body) => Scaffold(
                   backgroundColor: cs.surface,
                   extendBodyBehindAppBar: underlap,

lib/frontend/widgets/lottie_image.dart

@@ -64,6 +64,24 @@ class LottieScrollScope extends InheritedWidget {
       !identical(oldWidget.isScrolling, isScrolling);
 }
 
+class LottieHoldScope extends InheritedWidget {
+  final ValueListenable<bool> isHeld;
+
+  const LottieHoldScope({
+    super.key,
+    required this.isHeld,
+    required super.child,
+  });
+
+  static ValueListenable<bool>? of(BuildContext context) => context
+      .dependOnInheritedWidgetOfExactType<LottieHoldScope>()
+      ?.isHeld;
+
+  @override
+  bool updateShouldNotify(LottieHoldScope oldWidget) =>
+      !identical(oldWidget.isHeld, isHeld);
+}
+
 class LottiePlayer extends StatefulWidget {
   final String lottieUrl;
   final String? fallbackUrl;
@@ -97,6 +115,7 @@ class _LottiePlayerState extends State<LottiePlayer>
   late final bool _native;
   RlottieClip? _clip;
   ValueListenable<bool>? _scrollState;
+  ValueListenable<bool>? _holdState;
   int? _px;
   bool _started = false;
   bool _showedFrames = false;
@@ -110,8 +129,10 @@ class _LottiePlayerState extends State<LottiePlayer>
   double? _lastElapsedMs;
 
   bool get _isScrolling => _scrollState?.value ?? false;
+  bool get _isHeld => _holdState?.value ?? false;
   bool get _canLoad =>
       !_isScrolling &&
+      !_isHeld &&
       (widget.eager || !LottieLoadGovernor.instance.throttled.value);
 
   @override
@@ -131,6 +152,12 @@ class _LottiePlayerState extends State<LottiePlayer>
       _scrollState = state;
       _scrollState?.addListener(_onGateChanged);
     }
+    final hold = LottieHoldScope.of(context);
+    if (!identical(hold, _holdState)) {
+      _holdState?.removeListener(_onGateChanged);
+      _holdState = hold;
+      _holdState?.addListener(_onGateChanged);
+    }
   }
 
   @override
@@ -155,6 +182,7 @@ class _LottiePlayerState extends State<LottiePlayer>
     _deferTimer?.cancel();
     LottieLoadGovernor.instance.throttled.removeListener(_onGateChanged);
     _scrollState?.removeListener(_onGateChanged);
+    _holdState?.removeListener(_onGateChanged);
     _ticker.dispose();
     _releaseClip();
     _frameIndex.dispose();
@@ -232,15 +260,16 @@ class _LottiePlayerState extends State<LottiePlayer>
     if (_started) return;
     if (_canLoad) {
       _startLoad();
-    } else if (!_isScrolling) {
-      // Blocked only by the frame-time governor: defer, but never starve.
+    } else if (!_isScrolling && !_isHeld) {
       _deferTimer ??= Timer(_maxLoadDefer, _forceDeferredLoad);
     }
   }
 
   void _forceDeferredLoad() {
     _deferTimer = null;
-    if (mounted && !_started && _clip == null && !_isScrolling) _startLoad();
+    if (mounted && !_started && _clip == null && !_isScrolling && !_isHeld) {
+      _startLoad();
+    }
   }
 
   void _startLoad() {