[Bug report] scrollExtent 高度异常

[944095635]

Version

1.26.0

Platforms

dart

Device Model

any

flutter info

[√] Flutter (Channel stable, 3.29.3, on Microsoft Windows [版本 10.0.26100.3775], locale zh-CN) [493ms]
    • Flutter version 3.29.3 on channel stable at E:\Flutter\SDK
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision ea121f8859 (5 weeks ago), 2025-04-11 19:10:07 +0000
    • Engine revision cf56914b32
    • Dart version 3.7.2
    • DevTools version 2.42.3

[√] Windows Version (Windows 11 or higher, 24H2, 2009) [1,901ms]

[√] Android toolchain - develop for Android devices (Android SDK version 35.0.1) [2.8s]
    • Android SDK at E:\AndroidSDK
    • Platform android-35, build-tools 35.0.1
    • ANDROID_HOME = E:\AndroidSDK
    • Java binary at: E:\AndroidStudio\jbr\bin\java
      This is the JDK bundled with the latest Android Studio installation on this machine.
      To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 21.0.6+-13368085-b895.109)
    • All Android licenses accepted.

[√] Connected device (3 available) [517ms]
    • IN2020 (mobile)   • 973b6 • android-arm64  • Android 15 (API 35)
    • Windows (desktop) • windows  • windows-x64    • Microsoft Windows [版本 10.0.26100.3775]
    • Edge (web)        • edge     • web-javascript • Microsoft Edge 135.0.3179.98

How to reproduce?

首次进入某个使用List的聊天页面，
增加日志信息，如下：

I/flutter (10266): scrollExtent:0.0
I/flutter (10266): viewportMainAxisExtent:807.1438571428571
I/flutter (10266): scrollExtent:319.42857142857144
I/flutter (10266): viewportMainAxisExtent:807.1438571428571

退出后再次进入页面，日志如下：

I/flutter (10266): scrollExtent:0.0
I/flutter (10266): viewportMainAxisExtent:807.1438571428571
I/flutter (10266): scrollExtent:1694.1203377902884
I/flutter (10266): viewportMainAxisExtent:807.1438571428571

因为 计算出错，导致 innerIsShrinkWrap 不匹配

具体日志位置：

C:\Users\XX\AppData\Local\Pub\Cache\hosted\pub.dev\scrollview_observer-1.26.0\lib\src\utils\src\chat\chat_scroll_observer.dart

observeSwitchShrinkWrap() {
    ambiguate(WidgetsBinding.instance)?.addPostFrameCallback((_) {
      final ctx = observerController.fetchSliverContext();
      if (ctx == null) return;
      final obj = ObserverUtils.findRenderObject(ctx);
      if (obj is! RenderSliver) return;
      final constraints = ObserverUtils.sliverConstraints(obj);
      if (constraints == null) return;
      final viewportMainAxisExtent = constraints.viewportMainAxisExtent;
      final scrollExtent = obj.geometry?.scrollExtent ?? 0;
      debugPrint("scrollExtent:" + scrollExtent.toString());
      debugPrint("viewportMainAxisExtent:" + viewportMainAxisExtent.toString());
      if (viewportMainAxisExtent >= scrollExtent) {
        if (innerIsShrinkWrap) return;
        innerIsShrinkWrap = true;
        observerController.reattach();
        toRebuildScrollViewCallback?.call();
      } else {
        if (!innerIsShrinkWrap) return;
        innerIsShrinkWrap = false;
        observerController.reattach();
        toRebuildScrollViewCallback?.call();
      }
    });

Logs

Example code (optional)

Contact

No response

[LinXunFeng]

示例代码是否可以复现？如不能，请提供可复现的完整代码

[LinXunFeng]

因太久未回复而关闭