Strange behaviour after pinch/zoom Gesture on Window titlebar

[akstek]

If you do a pinch/zoom Gesture on the Titlebar of a open jsPanel Window and click afterwards anywhere on the free area around the window it will change its position.

To Reproduce

1. Open the jspanel Website in a Browser on a Touch Device
2. Wait for the demo window to open
3. Do a pinch/zoom Gesture on the Titlebar of the window
4. Click anywhere in the free space around the window
5. The window will change its position to the point of the click.

See this video demo:
https://sigmatek-my.sharepoint.com/:v:/g/personal/alexander_knett_sigmatek_at/ESwHFDg3vJZMojegNPld-rUBdCaQ5X0BcmSAVrVYynaPhQ?e=aHXQIo

Expected behavior
The window should not change its position.

Devices used:

• Galaxy Tab S7+, Thinkpad T470s with Touch, Linux Desktop Device with Touchscreen
• Android 12 Chrome 103.x / Windows 10 + Chrome 103.x / Debian Linux + Chrome 80.x /

[Flyer53]

@akstek
Thanks for the report ... I could reproduce the issue.
Well, jsPanel does not support any multi-touch gestures whatsoever. And it doesn't include any code that tries to handle inadvertent multi-touch actions. I guess the issue is related to that facts.

I'm sorry, but this most probably will not change, at least not within v4.x of jsPanel.

Regards,
Stefan

[akstek]

Doing a Pinch/Zoom Gesture on a mobile is a common task.

The bad thing about this bug is that the user has to reload the page to get rid of it.

I narrowed it down that there is a mousemove handler bound to the document, which never gets removed on touchend/mouseup.

[Flyer53]

Well, you might be right. And I know that my jsPanel code has flaws. But please consider that I'm NOT a professional/trained programmer, and therefore, my skills as programmer are limited. jsPanel is sort of a hobby I do in my spare time. If I ever start a version 5 a few things will most probably be done differently ... and hopefully better. But for now ... it's the best I can do.

Furthermore, as someone doing this in his sparetime and providing jsPanel for free I don't have a huge assortment of devices to test on (especially devices with a touchscreen).

I hope you can understand me reasoning.

PS: If you can track it down to a specific handler ... maybe you can also provide a fix. So far I thought all handlers concerning the dragit/resizeit features are removed on mouseup/touchend/pointerup.

[AviHafner]

Hello Stefan
I'm not trying only to flatter you in this letter .

I have been a programmer all my life and have 40 years of experience in development ,
I am professionally valued in my workplaces, with great professional pride.

You are a better programmer than me on several levels in the field you are familiar with,
Client side web development and knowledge of javascript css and more.

Over the years I have learned a lot from you, and I have received great professional help from you that has improved my projects that I am so proud of.

And like me, over the years quite a few people have been helped by and your excellent professionalism.

A programmer does not have to study in school to be a valued and high-level professional

programmer can be an excellent programmer with as much common sense and experience and self-learning ability as you have.

Stefan
I declare that you are an excellent programmer that many would like the ability you demonstrate

Yours always in friendship
Hefner Avi

[Flyer53]

@AviHafner
Hi Avi my friend,
Thank you so much for your extremely friendly words, I really do appriciate it😄

My very best regards,
Stefan

[akstek]

@Flyer53
I tired to fix this. But I don't know if this affects other areas.
master...akstek:jsPanel4:Pinch_Zoom_Fix

And THX for your hard work, jsPanel is a great pice of software.

[Flyer53]

@akstek
Thanks for your effort.
I'm currently out of town for about two weeks. I'll check it as soon as I'm back home.

[akstek]

@Flyer53 Any updates on this?

[Flyer53]

@akstek
Sorry, there are no news on this.
And due to some urgent family issues I currently neither have the time nor the necessary peace to do any substantial work on jsPanel. So this will have to wait and I can't say when I'll be able start some more work...

[akstek]

OK, wish you all the best. In the meantime we will use our patched version.