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From "Roger Whitcomb (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PIVOT-933) Allow refusal to open a TreeView branch
Date Fri, 20 Dec 2013 21:30:09 GMT
Roger Whitcomb created PIVOT-933:
------------------------------------

             Summary: Allow refusal to open a TreeView branch
                 Key: PIVOT-933
                 URL: https://issues.apache.org/jira/browse/PIVOT-933
             Project: Pivot
          Issue Type: Improvement
          Components: wtk, wtk-terra
    Affects Versions: 2.1
         Environment: All
            Reporter: Roger Whitcomb
            Assignee: Roger Whitcomb
            Priority: Minor
             Fix For: 2.1


In some cases (i.e., doing lazy loading of contents of a tree branch) an error might occur
that precludes getting the information for the branch.  In this case it would be better to
simply refuse to open the branch because the information is inaccurate or not available, rather
than show a (potentially misleading) empty list.

This is a simple change to add a method to TreeViewBranchListener called "previewBranchExpandedChange"
that returns a Vote as to whether or not to expand/collapse the branch, similarly to the way
Rollups and Accordions work.  The Adapter will return Vote.APPROVE so (most) existing apps
will continue to work as before (unless they directly implement the TreeViewBranchListener
interface instead of subclassing the Adapter).  Will also need to implement the "branchExpandedChangeVetoed"
method to be consistent (although there is currently no use for it in the skin).

Adding this in a point release (2.1) instead of a maintenance release (2.0.4) because the
API is changing.



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