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Bug 4238 - Touch screen taps on laptop cause which=0 mouse down events, instead of which=SDL_TOUCH_MOUSEID
Summary: Touch screen taps on laptop cause which=0 mouse down events, instead of which...
Status: RESOLVED WORKSFORME
Alias: None
Product: SDL
Classification: Unclassified
Component: *don't know* (show other bugs)
Version: 2.0.8
Hardware: x86_64 Linux
: P2 major
Assignee: Ryan C. Gordon
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2018-08-24 17:58 UTC by Ellie
Modified: 2020-03-18 12:47 UTC (History)
1 user (show)

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Description Ellie 2018-08-24 17:58:17 UTC 
On this Linux laptop, touch screen taps on the laptop screen cause which=0 mouse down events, instead of which=SDL_TOUCH_MOUSEID. This has the potential to wreck havoc on touch input handling for any application that does its own touch processing (which I wanted to do), since this effectively makes it hard (impossible?) to tell apart regular mouse clicks and touch taps.

Hardware: Thinkpad Yoga 260
OS: GNU/Linux Fedora 28
Desktop: GNOME 3.28.2 (Xorg Session, not the default Wayland session)
Comment 1 Ellie 2018-08-25 17:06:47 UTC 
I investigated this some more, and I'm not getting touch events AT ALL - every touch is just a which:0, button:1 mouse down. This is with SDL2 as provided by Fedora. Is this potentially some compilation issue, with some extension required for proper touch processing not compiled in?
Comment 2 Ellie 2018-09-29 15:19:31 UTC 
I now filed a Fedora bug report here, since I don't know if this potentially a packaging issue: https://bugzilla.redhat.com/show_bug.cgi?id=1634291
Comment 3 Ellie 2020-03-18 12:47:53 UTC 
I haven't seen this for a while, so maybe it was fixed on Fedora's side