RE: epicsQt/caWtDM and sliders

[Andrew Rhyder <Andrew.Rhyder@synchrotron.org.au>]

Hi Emmanuel

I was assuming that a property setting the slider step size for arrow keys at design time, but you are talking about changing this dynamically? Is this correct?

Regards

Andrew

 

From: Emmanuel Mayssat [mailto:emayssat@epicsqt.org]
Sent: Saturday, 25 April 2015 3:19 AM
To: Andrew Rhyder; John Dobbins; EPICS mailing list
Subject: RE: epicsQt/caWtDM and sliders

 

Andrew,

To reiterate John's point, the step increment of a slider should be fast and easy to change.
At Lyncean, a typical scenario would be the gross and fine adjustments of RF phase settings of klystrons.
For example, an operator would look at a screen after a bending magnet (diagnostics related to the e- beam energy) and adjust/optimize the RF phases accord to the beam position and shape. This gross and fine tuning approach is used in quite a few places on the accelerator side.
FYI.

--
Emmanuel Mayssat

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From: Andrew.Rhyder@synchrotron.org.au
To: john.dobbins@cornell.edu; tech-talk@aps.anl.gov
Subject: RE: epicsQt/caWtDM and sliders
Date: Fri, 24 Apr 2015 09:59:23 +0000

Hi John

 

Firstly, you may not be aware there are two slider controls in the EPCISQ t framework – QESlider that is intended to function just like a standard Qt slider but be connected to a PV, and QEAnalogSlider which is intended to allow slider control but give much richer feedback with a separate readback scale, alarm limits, set points, etc.

 

Regarding incremental adjustment, both these allow incremental movement using the mouse. Did that not work for you, or is the problem setting the appropriate increments, etc?

 

Regarding the slider not stopping if the mouse pointer moves off the slider knob, as Emmanuel mentioned the intention is not to emulate MEDM/EDM, but to provide modern style controls, and generally people are now used to the mouse holding onto the control no matter how far the pointer wanders from it (sliders, scroll bars, window edges, etc). Apart from providing familiar interaction I feel that this also allows the user to focus on more important things than exactly where the pointer is in relation to the control. The user knows they have control until they release the button. That said, while the aim is not to emulate medm/edm, the aim IS to provide controls with the required functionality, and I’m happy to discuss any potential changes that make the controls more functional. While I’d argue against this behaviour in a modern GUI, one justification for it may be to ensure slider widgets from both the EPICSQt and caQtDm widget sets can be mixed and matched more comfortably.

 

Regards

 

Andrew

 

 

From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov] On Behalf Of John Dobbins
Sent: Wednesday, 22 April 2015 1:47 AM
To: tech-talk@aps.anl.gov
Subject: epicsQt/caWtDM and sliders

 

All,

 

I am exploring the Qt display managers options. One of the first things I was interested in checking ou t were the sliders. (We have several development machines where manual adjustment is a daily part of operations) I find:

 

1) The epicQt slide has no increment adjustment (? ) Is there anything that would preclude adding this. I don't know where the default increment is set (methods inherited from Abstract Slider?)

 

2) The caQtDm slider stops following if the mouse pointer moves off the slider knob (?)  If one attempts to move too fast the slider stops following. (Different behavior than EDM/MEDM/CSS.)

 

Regards,

 

John Dobbins