David,

The tree macro is defined here $:/core/macros/tree

   - you could modify it to get the desired result
   - or make a new one of your own
   - Consider if it has an icon use it if not use the default.
   - Perhaps its best to also display the icon if its exist and still 
   display the defaults because it indicates file or "folder".
   - Inside the macro that defines the link displayed the variable 
   <<full-title>> is the actual tiddlername 

The following is a modification of one of these macros to display an icon 
on leaf items if it exists;
\define leaf-link(full-title,chunk,separator: "/")
<$set name=icon-tiddler tiddler=<<__full-title__>> field=icon>
<$link to=<<__full-title__>>> <$transclude tiddler=<<icon-tiddler>>/> 
<$text text=<<__chunk__>>/></$link>
</$set>
\end

Regards
Tones
On Thursday, 17 December 2020 at 07:01:30 UTC+11 david.j.winfi...@gmail.com 
wrote:

> Is there a simple way to associate an image/icon with a tiddler (such as 
> an icon field), so that the icon will show up in the tree macro?
>
> Something like tiddlers
> H:/Location/Location 1
> H:/Location/Location 2
>
> With the following tree:
> <<tree "H:/Location/">>
>
>
> With each Location 1 and Location 2 being able to have a unique icon image 
> in the tree instead of the default icon.
>
> Thanks,
> David
>
>

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