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https://issues.apache.org/jira/browse/FLEX-35232?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Anderson updated FLEX-35232:
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Attachment: TestFilteredArrayList.zip
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 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. The
FilteredArrayList implementation is in:
- src/collections/FilteredArrayList.as
- src/collections/IFilter.as
> Filter for ArrayList Data Providers
> -----------------------------------
>
> Key: FLEX-35232
> URL: https://issues.apache.org/jira/browse/FLEX-35232
> Project: Apache Flex
> Issue Type: New Feature
> Components: FlexJS
> Reporter: Joel Anderson
> Priority: Minor
> Labels: flexjs
> Attachments: TestFilteredArrayList.zip
>
>
> I created this issue to track the progress for the feature discussed here:
> http://apache-flex-development.2333347.n4.nabble.com/Filter-function-to-ArrayList-td57239.html
> The idea is add filtering based on a search string (or other criteria) for an
> ArrayList. This could then be used to add filtering to a DataGrid or List UI
> component.
> This is one of the features provided by the ArrayCollection class in Flex:
> http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/mx/collections/ListCollectionView.html#filterFunction
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