RE: Browser based EPICS GUI

[<tom.cobb@diamond.ac.uk>]

That’s intriguing, I’ve always thought that a natural progression of QML would be to run it in the browser with no Qt dependencies on the server, and it looks like with QMLWeb (http://akreuzkamp.de/2013/07/10/webapps-written-in-qml-not-far-from-reality-anymore/)  that is what you can do. If we combined that with WebPDA (Xihui’s earlier post), then we could have a single QML file (either hand coded or made using the Qt Creator GUI), which could either be displayed in a Qt application using the channel access libs for communication (something we have already experimented with at Diamond) or served up via a Java webserver using WebPDA websockets for communication.

 

I think this merits some further investigation...

 

Thanks,

Tom Cobb

 

From: Emmanuel Mayssat [mailto:emayssat@epicsqt.org]
Sent: 11 November 2014 23:53
To: Alex Wallace; EPICS mailing list
Subject: RE: Browser based EPICS GUI

 

"I am trying to get a feel for how possible it would be to create a framework for this concept"
Qt5+ is certainly something you should have a look at.

https://www.qtdeveloperdays.com/north-america/track/17/web

QML (Qt Markup Language) GUIs can be served by a web-server
QtWebKit allows you to have hybrid applications (i.e. change the DOM with widgets)
QtWebChannel allows desktop applications to interact with others processes like a web browser
Qt has an extremely good and simple integration with (TCP-based) websockets.
QtWebEngine ...

Let me stop just here and say that HTML5 is one of the 3 officially supported GUI by the Qt framework.

But to tell you exactly what to use, I need to know
* where are the clients located (on your EPICS LAN?)
* what desired update rate and latency are,  (TCP or UDP?)
* what technology is used on the server side (stuck on webserver?)
* what the desired access rights are, (read only?)
etc.

Enjoy,

--
Emmanuel Mayssat
http://www.epicsqt.org

> Date: Mon, 10 Nov 2014 14:21:05 -0800
> From: awallace@slac.stanford.edu
> To: tech-talk@aps.anl.gov
> Subject: Browser based EPICS GUI
>
> Hi,
>
> Does anyone know of a project or collaboration to provide web-browser
> based EPICS control screens? I am trying to get a feeling for how
> possible it would be to create a framework for this concept.
>
> Thanks!
>
> --
> Alex Wallace
> Control Systems Engineering
> RED Controls & Data Systems
> Bldg. 901 Room 130B
> ext. 3516
> cell (925)785-4338
>

 

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