uicolumn components can contain header and footer facets. But these facets must be handled by the parent uidata since they are only processed one time and not for every row.
UIColumn could define something like processHeaderDecodes() which is called by parent UIData. but that would require a lot of new methods in UIColumn. 2005/11/6, Simon Kitching <[EMAIL PROTECTED]>: > Craig McClanahan wrote: > > Going back to the original question, the reason for UIData to deal with > > grandchildren directly is explicity described in the javadocs quoted > > earlier -- it allows UIData to perform the iteration over the underlying > > data model. Among other things, that means UIData actually calls things > > like processDecodes() *multiple* times on the same grandchildren ... > > once per row. UIColumn doesn't get involved in this at all, other than > > being a container for the contents of the grandchildren that will be > > rendered inside that column zero or more times (indeed, it doesn't even > > have a renderer). > > I agree that MyFaces is implementing the logic as defined in the Sun RI > javadoc, so there is no "bug" for MyFaces to fix. > > But *why* is UIData.processDecodes defined in such an odd way? > > I agree that individual components that are rendered within table cells > (h:outputText, h:inputText, etc) should be isolated from the fact that > they are in a table. > > > However, why can't UIData call processDecodes on each UIColumn once for > each row? The UIColumn would then simply call processDecodes on each of > its children in turn. The end result would be, as far as I can tell, > identical to the current definition except that the UIColumn is > responsible for invoking processDecodes on its children rather than the > UIData accessing them directly. Won't the leaf components see the same > calls, regardless of whether it is the UIColumn or the UIData that calls > them? I must be missing something but can't see what. > > On a related topic, is there any documentation on why UIData is > specified to process only UIColumn children? What other kind of children > could be valid inside a table? Using "instanceof" is generally pretty > poor taste in OO software and I can't see the justification for it here. > It seems so much easier to specify that UIData just calls > "processDecodes" on *every* child it has, once per row in the table. > > > Regards, > > Simon > -- Mathias
