I started some work on this feature. I created a JIRA issue here:
https://issues.apache.org/jira/browse/FLEX-35232
I created a simple implementation, FilteredArrayList, that is just a
subclass of ArrayList.
I created an IFilter interface to define the filter, rather than the
Function used by ArrayCollection. I originally tried to use a Function, but
I found that it did not convert properly in the Javascript application.
This solution maintains a second ArrayList that represents the elements that
match the given filter. The ArrayList functions are overridden to update
this list as appropriate.
I confirmed that I could use FilteredArrayList with a DataGrid. See
TestFilteredArrayList.zip in JIRA for an example project. Note that the
changes will not be updated to DataGrid until you click "Refresh"
Some notes:
- This is a proof of concept. The class needs some more robustness and
testing before it is ready for "production"
- I used the filtered list for the {{getItemAt}} and {{length}}
implementation
- For other functions that use a specific index (addItemAt, removeItemAt,
updateItemAt), I used the index of the parent class. This could be a bit
unintuitive for some cases
- I have not implemented getItemIndex, itemUpdated, itemUpdatedAt, and
setItemAt
- There is no way to read items directly from the underlying list, for now.
- I have not yet created a specialized interface for this class (i.e.
IFilteredArrayList). I haven't seen an advantage to this, yet.
- I have not added any events to the functions.
I have attached an example application as TestFilteredArrayList.zip to the
JIRA issue. The FilteredArrayList implementation is in:
- src/collections/FilteredArrayList.as
- src/collections/IFilter.as
Joel Anderson
My Apache Flex community contribution is working on the open source
Moonshine-IDE.com for FlexJS.
--
View this message in context:
http://apache-flex-development.2333347.n4.nabble.com/Filter-function-to-ArrayList-tp57239p57642.html
Sent from the Apache Flex Development mailing list archive at Nabble.com.
