New Tag feature : Adding colors

[Rdornier]

Having different colors for tags could be a very good option to make the webclient more user-friendly (like in Trello cards).
The colors could visually differenciate processes, categories, workflows... For example, blue tags could refer to the biological sample, green ones to the microscope acquisition and orange ones to proessing.

Forum thread : https://forum.image.sc/t/omero-tags-queries/82584

[imagesc-bot]

This issue has been mentioned on Image.sc Forum. There might be relevant details there:

https://forum.image.sc/t/omero-tags-queries/82584/4

[will-moore]

Items of work (if we decide to use LongAnnotations on a Tag to store a colour value)

• Need some way to add a colour annotation to a Tag and make sure only 1 is added. This could be done in the right panel when the Tag is selected, since that will allow updating of the colour after creation. Users might expect to be able to do this in the Tag creation dialog but that will make the dialog more complex and the API end-points for Tag creation (which are already a bit complex with tags to add and remove) will also have to include colour for new Tags. So, simpler to only support editing of colour after creation. This will need a new URL endpoint. The Colour Annotations will need a custom namespace to indicate that they are "Colour annotations". Although OMERO permissions allow anyone in a read-annotate group to add Annotations to other's data, it might make sense to restrict this to the owner of the Tag.

• When tags are loaded and we want to show colours, we'll also need to load the Colour annotations:

  • When loading Tags for right panel, which uses /webclient/api/annotations/?type=tag&image=1. This loads the Tags via

    omero-web/omeroweb/webclient/views.py

    Line 1342 in ba072f1

    def api_annotations(request, conn=None, **kwargs):

    and

    omero-web/omeroweb/webclient/tree.py

    Line 2049 in ba072f1

    select oal from %sAnnotationLink as oal

    . That query will need another join/fetch etc to load Colour Annotations if we are loading Tags (but not when loading other annotations)
  • When loading Tags for the Tree (left panel). That is loaded with e.g. /webclient/api/tags/?orphaned=true&experimenter_id=-1 but uses the same OMERO query function as above.
  • Possibly also in the Tagging dialog.
  • When we are filtering a Dataset by Tag - uses same URL endpoint as for right panel

• Maybe also in tagsearch and autotag plugins? cc @Tom-TBT