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Scrollable TabBar display bug in --release build #23339

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Kapranov98 opened this Issue Oct 20, 2018 · 4 comments

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@Kapranov98
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Kapranov98 commented Oct 20, 2018

Hello. There is a problem with the display of the Scrollable TabBar in --release assemblies. I took the sample code from the official documentation, made 5 tabs and got the result as in the screenshot. The first tab is partially outside the left edge of the screen. There is no problem in the --debug build.

Code main.dart

Logs

Analyzing tabview_sample...

   info - Unused import: 'package:tabview_sample/main.dart' - test\widget_test.dart:11:8 - unused_import
  error - The constructor returns type 'dynamic' that isn't of expected type 'Widget' - test\widget_test.dart:16:29 -
         strong_mode_invalid_cast_new_expr
  error - Undefined class 'MyApp' - test\widget_test.dart:16:33 - undefined_class

3 issues found. (ran in 4.4s)
[√] Flutter (Channel master, v0.10.1-pre.108, on Microsoft Windows [Version 10.0.17763.104], locale ru-RU)
    • Flutter version 0.10.1-pre.108 at D:\Programs\flutter
    • Framework revision 8007e1bc2f (24 hours ago), 2018-10-19 14:18:47 -0700
    • Engine revision 2707b74338
    • Dart version 2.1.0-dev.7.1.flutter-b99bcfd309

[√] Android toolchain - develop for Android devices (Android SDK 28.0.3)
    • Android SDK at D:\Programs\Android_SDK
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-28, build-tools 28.0.3
    • ANDROID_HOME = D:\Programs\Android_SDK
    • Java binary at: D:\Programs\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1136-b06)
    • All Android licenses accepted.

[√] Android Studio (version 3.2)
    • Android Studio at D:\Programs\Android Studio
    • Flutter plugin version 29.1.1
    • Dart plugin version 181.5656
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1136-b06)

[!] Connected device
    ! No devices available

Screenshot

screenshot_2018-10-21-00-45-04-320_com example tabviewsample

@jason-simmons

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jason-simmons commented Oct 24, 2018

This is a race between the embedder providing the viewport dimensions and the TabBar widget calculating the scroll offset. The embedder may initially claim that the viewport has zero width/height, and if the TabBar framework code runs before the real values arrive then the resulting offset will be wrong. The framework does not appear to recalculate the offset when the viewport metrics are updated.

@HansMuller

@jelly-cai

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jelly-cai commented Nov 5, 2018

how to solve this problem

@kunkun12

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kunkun12 commented Jan 2, 2019

this problem also happed to me, not solved

@fengzhongyun1992

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fengzhongyun1992 commented Jan 10, 2019

我碰到这个bug, 思考了两个多星期,通过qq群问人,有人通过 添加动画来 规避 这个bug。
我是通过添加 启动页 来规避这个bug的。 启动页项目参考:https://github.com/bowen919446264/demowelcome.git

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