Should we support internal transitions? #13

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1. dschnare

   assigned

   matb33

   ,

   ako977

   and

   frrf1

   on Jul 26, 2019
2. dschnare

   added

   questionFurther information is requestedFurther information is requested

   on Jul 26, 2019
3. matb33 commented on Jul 26, 2019

   

   matb33

   on Jul 26, 2019

   Contributor

   More actions

   This will be tricky. My understanding is that an internal transition is only available to sibling states. In xstate, you use the dot character to indicate that.

   But we use IDs everywhere, so it won’t be obvious that you can’t target non-siblings.

   This will need some thought before we attempt an implementation.

   Ideally we will have a real world use case first to drive this through.
4. dschnare

   closed this as completedon Sep 6, 2019
5. matb33 commented on Nov 6, 2019

   

   matb33

   on Nov 6, 2019

   Last edited by matb33

   Contributor

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   I ran into a potential use case for this. I needed the state to still change (therefore React to eventually re-render) without leaving and re-entering the state (I didn't want the callback to be called again -- I only wanted the "state" to change).

   E.g.:

   Loading First Thing
     updated caption -> ^Loading First Thing
     success -> Loading Second Thing
   Loading Second Thing
     updated caption -> ^Loading Second Thing
     success -> Done
   Done
   

   and in Loading First Thing.js:

   export async function (evt, send) {
     data.loadingCaption = 'Loading first thing...'
     send('updated caption')
     data.stuff = await loadFirstThing()
     send('success')
   }
   

   and in Loading Second Thing.js:

   export async function (evt, send) {
     data.loadingCaption = 'Loading second thing...'
     send('updated caption')
     data.stuff2 = await loadSecondThing()
     send('success')
   }
   

   Currently I have to split out the caption update stuff into its own state. It's explicit and correct, but lengthy... this is what i have to do now:

   Loading First Thing Caption Update
     updated caption -> Loading First Thing
   Loading First Thing
     success -> Loading Second Thing Caption Update
   Loading Second Thing Caption Update
     updated caption -> Loading Second Thing
   Loading Second Thing
     success -> Done
   Done
   

   and a callback file for each
6. matb33

   reopened this on Nov 6, 2019