[jira] [Created] (BATIK-1307) CSS class change on group does not trigger update

["Ahmed Hussain (Jira)" <ji...@apache.org>]

Ahmed Hussain created BATIK-1307:
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             Summary: CSS class change on group does not trigger update
                 Key: BATIK-1307
                 URL: https://issues.apache.org/jira/browse/BATIK-1307
             Project: Batik
          Issue Type: Bug
          Components: SVG DOM
    Affects Versions: 1.13
         Environment: Mac OS 11.13.1
            Reporter: Ahmed Hussain
         Attachments: complicated-css.svg, simple-css.svg

I'm using as an embedded component for diagrams in a project. I was trying to add some interaction, highlighting nodes and edges on mouse over. I am doing this from Java by hit testing on mouse-move, then modifying the DOM accordingly; this is much easier for my use case than adding javascript event handlers.

Since I have control over the top-level embedded CSS style block, it is easiest to put all the styling I require for highlighting into that, then toggle a 'highlight' class on and off when the mouse moves over a particular DOM element.

The problem I have run into is that the change to the class attribute doesn't seem to take effect in certain circumstances. My hunch is that the problem is that this occurs when the CSS acts indirectly. If you see the attached simple-css.svg, I can toggle 'highlight' programmatically on any of the rectangle objects and this correctly causes the styles to get updated, and the diagram to be repainted.

However, in complicated-css.svg this does not work. In theory I should be able to highlight the nodes or edges by adding a highlight css class to the grouping nodes e2, e6 etc. If I do this before loading the document, this renders fine. But if I toggle it programmatically on a live DOM, this does not get detected as triggering a style change. I can 'nudge' it by adding a stroke='red' attribute to the group - that then causes the rendering to change appropriately.

Assume it's something to do with event propagation/dirty DOM detection but haven't managed to figure out where.



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