Re: With set_event_compression, most recent motion event is held in waiting

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Message-ID: <[email protected]>
Subject: Re: With set_event_compression, most recent motion event is held in
 waiting
From: JLM <[email protected]>
To: "[email protected]" <[email protected]>
Date: Mon, 23 May 2022 21:39:57 -0400
In-Reply-To: <[email protected]>
References: <[email protected]>
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I have managed to cobble together a program in C which does the same
thing and confirmed that it is not a specific GTKMM problem at least.

On Tue, 2022-05-24 at 00:20 +0000, JLM via gtkmm-list wrote:
> Thanks. I took a look at the web page and I'm pretty sure that the
> described behavior is not what I am observing.
>=20
> For example, I move my mouse around within the DrawingArea, and in
> the
> console output I see this (truncated, just showing the end):
>=20
> 2109 649877100 motion 90.9368:79.8589
> 2110 649877101 motion 90.9368:81.137
> 2111 649877110 motion 89.6931:82.3807
> 2112 649877120 motion 88.6931:82.3807
> 2113 649877129 motion 88.6931:83.3807
> 2114 649877144 motion 87.6987:83.3807
> 2115 649877176 motion 87.6987:84.17
> 2116 649877191 motion 86.9109:84.17
>=20
> Then I wait a few seconds and press a key and see:
>=20
> 2117 649877194 motion 86.9109:85.1639
> 2118 649887986 key pressed
>=20
> The timestamp of event 2117 is just right after event 2116, but did
> not
> display until I pressed the key. It was recorded, but for some reason
> the program itself did not receive it (or I made some mistake, and my
> program is caching things somehow).
>=20
>=20
> On Mon, 2022-05-23 at 10:57 -0700, Andrew Potter via gtkmm-list
> wrote:
> >=20
> > On Mon, May 23, 2022 at 9:15 AM JLM via gtkmm-list
> > <[email protected]> wrote:
> > > I have updated my test. Now you don't have to press a mouse
> > > button,
> > > but
> > > you can press a keyboard key instead. The problem isn't that I am
> > > seeing extra events, the problem is that the extra event seems to
> > > be
> > > hiding, or stuck in a backend/library queue.
> > >=20
> >=20
> >=20
> > The issue is probably even lower than GTK. Maybe libinput? Did you
> > look at the timestamp of the events?
> >=20
> > https://wayland.freedesktop.org/libinput/doc/latest/timestamps.html
> >=20
> > The above link suggests some events are delivered out of order
>=20
> _______________________________________________
> gtkmm-list mailing list
> [email protected]
> https://mail.gnome.org/mailman/listinfo/gtkmm-list


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