Improve Switchable Widget and handle intermediate parameters

[YooSunYoung]

Current Switchable widget is a check box that shows the underlying widget when it's selected.

@jokasimr suggested different way of handling parameter switch.

Instead of setting switchable to all the parameters, we can treat all parameters switchable, and have a menu of parameter from the workflow, just like we select output.

And if the parameter is selected, it should show the widget on the right side and the workflow-running widget should set the parameters.

Here is the conceptual drawing how it can look like:

[jokasimr]

I was thinking the "select parameters" section could just be one big multiple-select containing both parameters and intermediate parameters all together (all domain types in the workflow).

I don't see the reason for keeping the distinction between intermediary and non-intermediary parameters.

[SimonHeybrock]

One problem with this solution is that it is totally non obvious to the user which parameters can be set. Parts of defining "THE" parameter of the workflow is to document which inputs are required or options. Saying "any of the intermediate results of the workflow is an optional input" does not serve this important purpose.

[jokasimr]

Is your concern is that the user wont know what parameters to select in the big multiple-select list of parameters?
That will be done automatically for them unless they manually change the settings that were made when they selected what outputs to target.

[SimonHeybrock]

Then I do not understand the suggestion. For example, above it says

Instead of setting switchable to all the parameters, we can treat all parameters switchable, and have a menu of parameter from the workflow, just like we select output.

Can you give an example of how this would work for, say, https://github.com/scipp/esssans/blob/1c407162a50f4e68b843899f55384f5c025e19e7/src/ess/sans/parameters.py#L99-L104?

[jokasimr]

It's really not different from how it works currently.
The only change is that we add a multiple-select that determines what parameters are displayed in the ParameterBox widget (the parameter form).

Here's the UX I'm imagining:

1. User selects workflow -> This updates the list of outputs they can select. (Just like today)
2. User selects outputs to target -> This triggers two changes:
   • list of parameters in the parameters multiple-select is updated to contain all parameters upstream from the selected outputs in the task graph
   • the root nodes of the task graph are selected in the parameters multiple-select
3. The user presses "Generate" button, the parameter form is populated with the parameters selected in the parameters multiple-select. (From this point everything is exactly like today)

If the user wants to set an intermediate value, they open the parameters-multiple select and selects that value, then they re-generate the parameter form.

Example - SANS direct beam
0. User selects sans workflow and IofQ output.

1. User opens parameters multiple-select.
2. User selects "DirectBeam"
3. User presses "Generate parameters"
   -> Parameter form is generated, the parameter form contains the direct beam widget.

[YooSunYoung]

• Remove radio button and use check box + stack for optional widget instead
  Currently we are using that combination for the switchable, but we can use them for optional if we use different solution.
  Then we don't have to heck the style for radio box to make it cleaner.

[SimonHeybrock]

Ok, so we keep the Parameter.switchable field 👍

[jokasimr]

Ok, so we keep the Parameter.switchable field 👍

I think @YooSunYoung point was that removing switchable widget would make it easier to style the parameter form.

[SimonHeybrock]

I was refering to class Parameter, not the widget itself. Are you suggesting that there should be a different mechanism outside Parameter that defines which parameters of the workflow are switchable by default?

[jokasimr]

I was refering to class Parameter, not the widget itself. Are you suggesting that there should be a different mechanism outside Parameter that defines which parameters of the workflow are switchable by default?

No I don't have an opinion on that

[jokasimr]

For clarity here are a couple of screenshots illustrating the idea:

Ignoring the collapsed "Manually select parameters" accordion makes the interface the same as what we have today.
If you open the "Manually select parameters" menu you can select intermediate values to be added to the parameters form.

[SimonHeybrock]

Sure, but to reiterate my question from above: How do you populate the "manually select parameters" list? If we use Parameter.switchable that is probably fine. If not, what is your plan?

We can chat in person today!