#2024 Launcher ultra-sensitive aircraft list scrolling

[Eric Mintz]

The Flightgear Launcher aircraft list scrolling is ultra-sensitive. In the touchpad, the slightest 2-finger scroll gesture that would cause other scrollers to barely move results in a far toss, often to the bottom or top of the list.

System:
Ubuntu Bionic Beaver
Lenovo Thinkpad Edge 545
Synaptics touchpad

[James Turner]

Ah I'll need to tweak the step size multipler, thanks for the report

[Eric Mintz]

Awesome. Glad to do it!

[James Turner]

Hmm, with my Bionic install, the velocity is qutie reasonable - using a mouse wheel however. I'm trying to figure out how your setpu might differ.

[Eric Mintz]

It works fine for me to with a mouse wheel (and also with a trackboall
scroller wheel), just not with the synaptic touchpad 2-fringer scroll
gesture. The touchpad scrolls fine in genera, just not in the FG launcher.
Let me know if I can help debug (I'm a developer myself and I don't mind
digging in to help).

Eric Mintz, CEO

Main: (678) 901-4565
Direct: (678) 901-4126
Cell: (404) 610-0946
https://www.emsquared-inc.com

On Tue, Jun 26, 2018 at 6:01 PM, James Turner jmturner@users.sourceforge.net wrote:

Hmm, with my Bionic install, the velocity is qutie reasonable - using a
mouse wheel however. I'm trying to figure out how your setpu might differ.

---

• [codetickets:#2024]
  https://sourceforge.net/p/flightgear/codetickets/2024/ Launcher
  ultra-sensitive aircraft list scrolling*

Status: Accepted
Milestone: 2018.2.3
Created: Sun Jun 24, 2018 08:02 PM UTC by Eric Mintz
Last Updated: Sun Jun 24, 2018 09:20 PM UTC
Owner: James Turner

The Flightgear Launcher aircraft list scrolling is ultra-sensitive. In the
touchpad, the slightest 2-finger scroll gesture that would cause other
scrollers to barely move results in a far toss, often to the bottom or top
of the list.

System:
Ubuntu Bionic Beaver
Lenovo Thinkpad Edge 545
Synaptics touchpad

---

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[James Turner]

Ah so this is likely that I use a flickable, and the touchpad sends 'real' touch events rather than synthetic wheel events. I have a touch-pad on my Mac, and one I can hook up to Linux, let me try those.

[Eric Mintz]

Happy to run a debug version that generates a log if that's helpful - or
even do a screen share if we can coordinate our schedules.

Eric Mintz, CEO

Main: (678) 901-4565
Direct: (678) 901-4126
Cell: (404) 610-0946
https://www.emsquared-inc.com

On Wed, Jun 27, 2018 at 5:49 PM, James Turner jmturner@users.sourceforge.net wrote:

Ah so this is likely that I use a flickable, and the touchpad sends 'real'
touch events rather than synthetic wheel events. I have a touch-pad on my
Mac, and one I can hook up to Linux, let me try those.

---

• [codetickets:#2024]
  https://sourceforge.net/p/flightgear/codetickets/2024/ Launcher
  ultra-sensitive aircraft list scrolling*

Status: Accepted
Milestone: 2018.2.3
Created: Sun Jun 24, 2018 08:02 PM UTC by Eric Mintz
Last Updated: Tue Jun 26, 2018 10:01 PM UTC
Owner: James Turner

The Flightgear Launcher aircraft list scrolling is ultra-sensitive. In the
touchpad, the slightest 2-finger scroll gesture that would cause other
scrollers to barely move results in a far toss, often to the bottom or top
of the list.

System:
Ubuntu Bionic Beaver
Lenovo Thinkpad Edge 545
Synaptics touchpad

---

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https://sourceforge.net/p/flightgear/codetickets/2024/

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[James Turner]

Okay, so my guess is this is a Qt bug - depending on how you installed Qt, you can open up Qt Creator and try one of the exampls which uses Flickable. Eg there is one called 'UI Components: Scroll Bar Example', try that with your mouse / wheels / touch-pad.

My fear is this is actually a Qt bug, and it may depend exactly on the X/compositor (Does Bionic use Wayland?) and on the Qt version (5.6 vs 5.9 vs 5.11)

[Eric Mintz]

I've never developed with qt. I just got it installed but I need a little
while to figure it out. In the mean time, I can see that Bionic is using
Xorg out of the box (not Wayland). I'll get a qt demo app running and let
you know if I see the same touchpad scroll behavior. Thanks for muddling
through this issue!

Eric Mintz, CEO

Main: (678) 901-4565
Direct: (678) 901-4126
Cell: (404) 610-0946
https://www.emsquared-inc.com

On Fri, Jun 29, 2018 at 7:53 AM, James Turner jmturner@users.sourceforge.net wrote:

Okay, so my guess is this is a Qt bug - depending on how you installed Qt,
you can open up Qt Creator and try one of the exampls which uses Flickable.
Eg there is one called 'UI Components: Scroll Bar Example', try that with
your mouse / wheels / touch-pad.

My fear is this is actually a Qt bug, and it may depend exactly on the
X/compositor (Does Bionic use Wayland?) and on the Qt version (5.6 vs 5.9
vs 5.11)

---

• [codetickets:#2024]
  https://sourceforge.net/p/flightgear/codetickets/2024/ Launcher
  ultra-sensitive aircraft list scrolling*

Status: Accepted
Milestone: 2018.2.3
Created: Sun Jun 24, 2018 08:02 PM UTC by Eric Mintz
Last Updated: Wed Jun 27, 2018 09:49 PM UTC
Owner: James Turner

The Flightgear Launcher aircraft list scrolling is ultra-sensitive. In the
touchpad, the slightest 2-finger scroll gesture that would cause other
scrollers to barely move results in a far toss, often to the bottom or top
of the list.

System:
Ubuntu Bionic Beaver
Lenovo Thinkpad Edge 545
Synaptics touchpad

---

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https://sourceforge.net/p/flightgear/codetickets/2024/

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[James Turner]

Let me know if you need help. On Bionic there is probablt a package liek qt5-examples? But I work woith Qt professionally so I use the QtSDK online installer to put Qt in a custom prefix, I don't use the distro-supplied Qt version.

(The distro version should work just fine but I'm often needing bleeding-edge features...)

[Eric Mintz]

Ok that was it! I have a sample app running and I'm getting the same sort
of irratic scrolling. The Qt version I'm using is 5.9 which is what is in
the Bionic repo.

By the way Qt pretty cool. Took me a minute to get the prereqs in and get
the IDE working but I like it.

Eric Mintz, CEO

Main: (678) 901-4565
Direct: (678) 901-4126
Cell: (404) 610-0946
https://www.emsquared-inc.com

On Fri, Jun 29, 2018 at 8:31 AM, James Turner jmturner@users.sourceforge.net wrote:

Let me know if you need help. On Bionic there is probablt a package liek
qt5-examples? But I work woith Qt professionally so I use the QtSDK online
installer to put Qt in a custom prefix, I don't use the distro-supplied Qt
version.

(The distro version should work just fine but I'm often needing
bleeding-edge features...)

---

• [codetickets:#2024]
  https://sourceforge.net/p/flightgear/codetickets/2024/ Launcher
  ultra-sensitive aircraft list scrolling*

Status: Accepted
Milestone: 2018.2.3
Created: Sun Jun 24, 2018 08:02 PM UTC by Eric Mintz
Last Updated: Fri Jun 29, 2018 11:53 AM UTC
Owner: James Turner

The Flightgear Launcher aircraft list scrolling is ultra-sensitive. In the
touchpad, the slightest 2-finger scroll gesture that would cause other
scrollers to barely move results in a far toss, often to the bottom or top
of the list.

System:
Ubuntu Bionic Beaver
Lenovo Thinkpad Edge 545
Synaptics touchpad

---

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https://sourceforge.net/p/flightgear/codetickets/2024/

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[James Turner]

Okay, so it would be worth trying Qt 5.11 from an SDK installer (it's free but you need to click skip to get past a screen that tries to 'encourage' buying Qt licenses). We can't report a Qt bug without testing against the latest Qt version.

[Eric Mintz]

Ok I'll give that a shot. I might spin up a VM for that though. I'll let
you know what I find.

Eric Mintz, CEO

Main: (678) 901-4565
Direct: (678) 901-4126
Cell: (404) 610-0946
https://www.emsquared-inc.com

On Fri, Jun 29, 2018 at 10:01 AM, James Turner jmturner@users.sourceforge.net wrote:

Okay, so it would be worth trying Qt 5.11 from an SDK installer (it's free
but you need to click skip to get past a screen that tries to 'encourage'
buying Qt licenses). We can't report a Qt bug without testing against the
latest Qt version.

---

• [codetickets:#2024]
  https://sourceforge.net/p/flightgear/codetickets/2024/ Launcher
  ultra-sensitive aircraft list scrolling*

Status: Accepted
Milestone: 2018.2.3
Created: Sun Jun 24, 2018 08:02 PM UTC by Eric Mintz
Last Updated: Fri Jun 29, 2018 12:31 PM UTC
Owner: James Turner

The Flightgear Launcher aircraft list scrolling is ultra-sensitive. In the
touchpad, the slightest 2-finger scroll gesture that would cause other
scrollers to barely move results in a far toss, often to the bottom or top
of the list.

System:
Ubuntu Bionic Beaver
Lenovo Thinkpad Edge 545
Synaptics touchpad

---

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https://sourceforge.net/p/flightgear/codetickets/2024/

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[James Turner]

Did you get any joy with a newer Qt version?

[Eric Mintz]

Hey, James. Thanks for the followup! I got super busy at work after you and
I started the conversation about the scrolling. I haven't hardly even been
flying because of it. In any case, I'm currently on Qt version 5.9.5 (I
don't recal if it got upgraded since we communicated list), and there is
still no change in the scrolling.

Eric Mintz, CEO

Main: (678) 901-4565
Direct: (678) 901-4126
Cell: (404) 610-0946
https://www.emsquared-inc.com

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On Tue, Sep 18, 2018 at 12:47 PM James Turner jmturner@users.sourceforge.net wrote:

Did you get any joy with a newer Qt version?

• [codetickets:#2024]
  https://sourceforge.net/p/flightgear/codetickets/2024/ Launcher
  ultra-sensitive aircraft list scrolling*

Status: Accepted
Milestone: 2018.2.3
Created: Sun Jun 24, 2018 08:02 PM UTC by Eric Mintz
Last Updated: Fri Jun 29, 2018 02:01 PM UTC
Owner: James Turner

The Flightgear Launcher aircraft list scrolling is ultra-sensitive. In the
touchpad, the slightest 2-finger scroll gesture that would cause other
scrollers to barely move results in a far toss, often to the bottom or top
of the list.

System:
Ubuntu Bionic Beaver
Lenovo Thinkpad Edge 545
Synaptics touchpad

---

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https://sourceforge.net/p/flightgear/codetickets/2024/

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[Gijs]

Assuming that this is no longer an issue after 5 years of no further reports.