[GitHub] [airflow] pierrejeambrun commented on issue #16432: Colour options for tags on DAGS

[GitBox <gi...@apache.org>]

pierrejeambrun commented on issue #16432:
URL: https://github.com/apache/airflow/issues/16432#issuecomment-1252599194

   I had a similar issue one time and we tried generating random colors based on the tag values. Sort of a hash function from string to hex color space. This was giving poor color choices, often with low contrasts and ended up using a predefined color palette.
   
   I am also in favor of a palette handled outside of dag files. We could get some inspiration from the color palette available in Chakra [here](https://chakra-ui.com/docs/styled-system/theme). Which is what we use in the react part of the UI. (We could also redefine our own palette with the tools specified there if needed)
   
   I like the idea of having a way to override the default palette via the configuration, maybe something similar to what we do for [state colors](https://airflow.apache.org/docs/apache-airflow/stable/howto/customize-ui.html), the difference being that it wouldn't be a mapping but a list ?
   
   With the current tag style in the UI (background-color), we also might need to adapt the text-color to have correct contrast (going with a border would circumvent that, as we do for state colors)
   
   One more thing, when creating the dict that @bbovenzi mention, I thing it is important to do it in a way that adding new tags do not shift the colors of existing ones. (could be weird to have changing colors for a specific tag from one day to another)


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