[MainUI] Allow selecting existing Items to add as points/properties from the Model config page

[rkoshak]

When someone is starting from scratch or has already built a semantic model in OH 2 this isn't a big deal. But if someone imports a bunch of Things and Items, or creates a bunch of Things and Items without building the model it becomes awkward adding those already existing Items to the model. One has to leave the model page, find the parent Group Item to add the Items to the right Location or Equipment, then go to the individual Items and edit them to add the semantic tags which takes a ton of clicks.

[mherwege]

Would be solved with model drag & drop: #2970

[rkoshak]

I don't think so. I'm referring to when you choose "Add equipment to thing" or "Add points to model" from the Thing's Channels page.

Which leads to the form where you select the Location, select/create the Location, then choose the Channels to link to new Items.

I want to link the Channel to an existing Item from here instead of only having the option to create a new Item.

#2970 helps with different use cases but not with this initial linking step.

[mherwege]

OK, sorry, I misunderstood.

[mherwege]

One has to leave the model page, find the parent Group Item to add the Items to the right Location or Equipment, then go to the individual Items and edit them to add the semantic tags which takes a ton of clicks.

Model drag/drop would allow you to do it from the model tree. You just drag the item to the right location or equipment. No need to add semantic tags manually.

[rkoshak]

Model drag/drop would allow you to do it from the model tree. You just drag the item to the right location or equipment. No need to add semantic tags manually.

True, but that's not the main focus of this issue. Though the way I worded the original issue I agree it kind of sounds like it. The whole issue of situating the Items into the model are indeed solved by the drag and drop PR. But it still would be great if we could select existing Items and not just create new Items from this form above and beyond the whole model discussion.