Add a Tree component in corelib
-------------------------------
Key: TAPESTRY-1718
URL: https://issues.apache.org/jira/browse/TAPESTRY-1718
Project: Tapestry
Issue Type: New Feature
Components: Core Components
Affects Versions: 5.0.5
Reporter: Francois Armand
There is no recursion available for template, and one of the most common use
case of recursion is tree structure traversal.
it would be _great_ if the core component library include a Tree component.
I have an example tree component here :
http://svn.forge.objectweb.org/cgi-bin/viewcvs.cgi/interldap/interldap-wui-t5/trunk/src/main/java/org/interldap/wui/tapestry/components/Tree.java?view=markup&rev=97
And an example of use :
http://svn.forge.objectweb.org/cgi-bin/viewcvs.cgi/interldap/interldap-wui-t5/trunk/src/t5-test/resources/org/interldap/wui/tapestry/pages/TestTree.html?view=markup&rev=139
Basically, the component take a DefaultMutableTreeNode as parameter and print
it in a preorder traversal, and one can specify a (unique) html element as a
level separator. But this component remains really simple and limited.
Moreover, as I'm a beginner with Tapestry, it could be totally not idiomatic of
the framework use (I try to base my implementation on "loop" component).
But it handles the most important functional requirement I want to see for this
component.
So, that is my (very basic) "wish list" for a tree component :
- the component traverse a Tree given in parameter
* DefaultMutableTreeNode may be used for the Java representation for the tree
;
* let the possibility to configure the traversal order, preorder is a good
default ;
- each iteration gives access to the current node ;
- the body render for each ieration is free (as in loop) ;
- "level" can be decorated (a tag or list of tag open before the level, closed
after) ;
There is surely others things to add ;)
hope it will gives you other ideas !
Francois
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