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58cc4b7e9b
## Summary - Keep jump-to-latest hidden through composer and keyboard layout changes while the user is still following the tail. - Stabilize thread tail detection during lazy scroll updates. - Unmount inactive iOS Liquid Glass controls so the channel arrow cannot bleed into an opened thread. ## Testing - just mobile-check - flutter test (1,864 passed) - Signed iOS Release build and install on iPhone Air --------- Signed-off-by: kenny lopez <klopez4212@gmail.com>
80 lines
2.4 KiB
Dart
80 lines
2.4 KiB
Dart
import 'package:flutter/material.dart';
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import 'jump_to_latest_button.dart';
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/// Whether channel Latest should remain hidden at the effective timeline tail.
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///
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/// Composer and keyboard layout updates can briefly make item-position
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/// measurements stale. Preserve an active tail-follow intent through those
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/// frames unless the user explicitly detached from the tail.
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bool shouldHideChannelJumpToLatest({
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required bool isAtLatest,
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required bool followsLatest,
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required bool userHasDetached,
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}) => isAtLatest || (followsLatest && !userHasDetached);
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/// Shared channel/thread visibility transition for [JumpToLatestButton].
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class JumpToLatestSwitcher extends StatelessWidget {
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final String id;
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final bool visible;
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final VoidCallback onPressed;
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const JumpToLatestSwitcher({
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required this.id,
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required this.visible,
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required this.onPressed,
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super.key,
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});
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@override
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Widget build(BuildContext context) {
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final reduceMotion = MediaQuery.disableAnimationsOf(context);
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final child = visible
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? JumpToLatestButton(
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key: ValueKey('$id-jump-to-latest'),
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id: id,
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onPressed: onPressed,
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)
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: SizedBox.shrink(key: ValueKey('$id-jump-to-latest-hidden'));
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if (Theme.of(context).platform == TargetPlatform.iOS) {
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return KeyedSubtree(
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key: ValueKey('$id-jump-to-latest-switcher'),
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child: child,
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);
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}
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return AnimatedSwitcher(
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key: ValueKey('$id-jump-to-latest-switcher'),
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duration: reduceMotion
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? Duration.zero
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: const Duration(milliseconds: 180),
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reverseDuration: reduceMotion
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? Duration.zero
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: const Duration(milliseconds: 160),
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switchInCurve: Curves.easeOutCubic,
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switchOutCurve: Curves.easeInCubic,
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transitionBuilder: (child, animation) => FadeTransition(
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opacity: animation,
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child: ScaleTransition(
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scale: _JumpToLatestScaleAnimation(animation),
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alignment: Alignment.bottomCenter,
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child: child,
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),
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),
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child: child,
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);
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}
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}
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class _JumpToLatestScaleAnimation extends Animation<double>
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with AnimationWithParentMixin<double> {
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@override
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final Animation<double> parent;
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_JumpToLatestScaleAnimation(this.parent);
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@override
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double get value => parent.status == AnimationStatus.reverse
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? parent.value
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: 0.92 + (0.08 * parent.value);
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}
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