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fix #1917

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Signed-off-by: dom <githubaccount56556@proton.me>
This commit is contained in:
dom
2026-04-30 17:35:55 +08:00
parent 3a46ce2429
commit 887c3525a2
1 changed files with 12 additions and 23 deletions
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35
lib/common/widgets/sliver/sliver_floating_header.dart
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@@ -20,7 +20,7 @@ import 'dart:math' as math;
import 'package:flutter/foundation.dart' show clampDouble;
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart'
show RenderSliverSingleBoxAdapter, SliverGeometry;
show RenderSliverSingleBoxAdapter, SliverGeometry, ScrollDirection;
/// ref [SliverFloatingHeader]
@@ -81,7 +81,9 @@ class _SliverFloatingHeaderScrollState
assert(_position != null);
final RenderSliverFloatingHeader? renderer = context
.findAncestorRenderObjectOfType<RenderSliverFloatingHeader>();
renderer?.isScrollingUpdate(_position!);
if (_position!.isScrollingNotifier.value) {
renderer?.updateScrollStartDirection(_position!.userScrollDirection);
}
}
@override
@@ -133,6 +135,12 @@ class RenderSliverFloatingHeader extends RenderSliverSingleBoxAdapter {
effectiveScrollOffset < child!.size.height);
}
ScrollDirection? _lastStartedScrollDirection;
void updateScrollStartDirection(ScrollDirection direction) {
_lastStartedScrollDirection = direction;
}
@override
void performLayout() {
if (!floatingHeaderNeedsToBeUpdated) {
@@ -141,7 +149,8 @@ class RenderSliverFloatingHeader extends RenderSliverSingleBoxAdapter {
double delta =
lastScrollOffset! -
constraints.scrollOffset; // > 0 when the header is growing
if (constraints.userScrollDirection == .forward) {
if (constraints.userScrollDirection == .forward ||
_lastStartedScrollDirection == .forward) {
final childExtent = child!.size.height;
if (effectiveScrollOffset > childExtent) {
effectiveScrollOffset =
@@ -217,24 +226,4 @@ class RenderSliverFloatingHeader extends RenderSliverSingleBoxAdapter {
required double mainAxisPosition,
required double crossAxisPosition,
}) => true;
void isScrollingUpdate(ScrollPosition position) {
if (position.isScrollingNotifier.value) {
return;
}
final direction = position.userScrollDirection;
late final childExtent = child!.size.height;
final bool headerIsPartiallyVisible = switch (direction) {
.forward when effectiveScrollOffset <= 0 => false,
.reverse when effectiveScrollOffset >= childExtent => false,
_ => true,
};
if (headerIsPartiallyVisible) {
effectiveScrollOffset = switch (direction) {
.forward => 0,
_ => childExtent,
};
markNeedsLayout();
}
}
}