Dynamic data model / parameter changes

[dsp56300]

We've noticed that rmlui doesn't support changing the data model or any of the bound parameters at runtime. However, there is a workaround:

• set properties, such as data-model and other attributes
• remove from parent
• add to parent again

For now we have implemented it just like that. Is there a better / cleaner way to do this?

[mikke89]

Hello. Yeah, you're right, this is not officially supported, so there is no clean way to do it. Any approach is a workaround and unsupported.

Can I ask about the motivation behind doing things this way? It could be helpful to understand.

[dsp56300]

Sure. We do synthesizers and most of them use multiple so called "parts", that means they can play multiple sounds at once. The editor is made so that you have to select the part that you want to edit and if you click on a part, all parameters are switched to edit the part that is selected.

At the moment we worked around that by using a data model that is called "partCurrent" besides "part0" to "part15", which is fine as well, but as you asked, this might be a good reason to think about adding it. Especially since it doesn't seem to be that complex to do as the parent-change workaround works fine too.

[mikke89]

Thanks for the explanation. And that screenshot looks awesome by the way. Let me know if you want me to add this to the gallery or thirdparty resources. Edit: Just saw the other ones too, they are so smooth!

This use case reminds me a lot about the discussion here: #748. I think in your case, it might be possible to use an alias from an index, something like: data-alias-currentPart="parts[currentPartIndex]".