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Jays2Kings / tachiyomiJ2K

Free and open source manga reader for Android
Apache License 2.0
4.62k stars 223 forks source link

[Bug] Pinch-zoom in webtoon view causes fast random scrolling #115

Open geominorai opened 4 years ago

geominorai commented 4 years ago

Device information

Steps to reproduce

  1. Enable webtoon viewing mode
  2. Pinch to zoom in or out

Expected behavior

Simple change of magnification without scrolling

Actual behavior

1/3 of the time it scrolls to high heaven (multiple pages away) as if flicking scrolling.

Other details

Video with Android dev option touch trails visible: https://www.dropbox.com/s/j71zz09hs8aob34/Tachiyomi_2020-02-16-19-34-38_1.mp4?dl=0

See also same issue reproduced on original Tachiyomi: https://github.com/inorichi/tachiyomi/issues/2602

geominorai commented 4 years ago

Following an OTA upgrade to Android 10, my S9+ no longer scrolls extreme distances following pinch release. Now there is only some scrolling in the direction of the last released finger press, which is a bit annoying but a lot more tolerable.

But this suggests the problem may be the app not waiting a bit following the start of the pinch release to allow both fingers to lift before starting to recognize a scroll gesture.

geominorai commented 4 years ago

This bug is still present in version 1.0.1: Video

All that scrolling was done simply by quickly pinching to zoom and unzoom.

joseph619 commented 3 years ago

Does this still happen?

geominorai commented 3 years ago

Does this still happen?

Yes, even on the current release, it still happens for me multiple times a day, so much so that it is very annoying.

geominorai commented 3 years ago

Or rather the underlying bug anyhow. It's also very reproducible with double-tap zoom.