[Filter field]: Add information about interaction level on the filter field.

[tomheller]

Feature Request

Summary

Add an @Output and a property to the filter field that indicates whether the user is currently using the filter field. This will help consumers to determine when it is safe to update filter-definitions (datasource) without crashing the user flow of the user.

The output can be useful to react to changes in the interaction-behaviour, whereas the property can be used for onDemand checks if it is now safe to update the datasource.

This state will probably need to determine the following things:

• Is the filter field focused
• is an autocomplete / range currently open

Proposal

Add the following to the filter field.
I'm happy to accept feedback, especially on the naming as I'm not sure how well this naming fits.

@Output() inFlightChange: EventEmitter<FilterFieldInFlightChange<boolean>>
Fires when the user starts interacting with the filter field or stops interacting with it.

inFlight: boolean
Determines if the user is currently interacting with the filter field or not.

Please add your considerations, especially pinging @ffriedl89 @thomaspink @ap-dyna

[ap-dyna]

Hi @tomheller,
This description looks good and I see the @output+property combination as useful.
(As for the naming, I will stick to your Barista conventions).

[ffriedl89]

I can see both the ouput and the boolean property being useful. I am also not quite convinced about the naming tbh.
Maybe
@Output() userInteractionChange for the output
userInteracting or isUserInteracting for the boolean flag

[tomheller]

I think it's a good point to go with
@Output() userInteractionChange for the output.
isUserInteracting for the boolean flag.

[ffriedl89]

Moved to internal issue tracking.