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From Greg Brown <gkbr...@mac.com>
Subject Re: Pivot vs. ExtJS
Date Sat, 20 Feb 2010 13:12:06 GMT
Hey Scott, 

> 2.  Table Views (ExtJS calls them grids).  Has anyone tried to implement the following
with Table Views in Pivot:  Row expanders (ability to expand a row to show more information
about a record, for example, a product description in a textarea underneath the row),

I haven't tried this so there may be some issues, but you might be able to use multiple table
views, each contained in a Rollup, to get this behavior. TableView's "columnSource" property
allows you to link a collection of table views to a primary table view that defines the columns.

> column filtering (basically turn each the column header into drop down menu that allows
you to enter a filter by string, which then limits the results to only the rows that contain
the entered value in the selected column. 

I am doing exactly this in an application I'm working on right now. You can register a mouse
listener on the table view header, then use the mouse coordinates to get the index of the
selected header. You can then call getHeaderBounds(index) to get the header bounds and align
your popup to it.

> My guess is that this is best done by removing rows (Objects) from the underlying List,
but you'd first need to make an unfiltered "copy" of it so that if the filter was cleared,
you could redisplay all the rows without having to re-query the application server.

As Todd suggested, the best approach would probably be to use a FilteredList. However, you
might also simply resubmit your query to the server (this is what I am doing in my app).

> 3.  Assigning values and display text to drop lists and radio buttons.  Let's say I create
a ButtonList.  I then create a GetQuery to retrieve some JSON from my application server,
which is automatically placed into an ArrayList of HashMaps by the JSON serializer. 
> So, let's assume that I'm querying a product database, and I'm getting back an array
of hashmaps that look like {productID:33443435, productName:'Widget Number 1', productDescription:'Blah
blah blah'}, how do I put this into my ButtonList so that the user sees the product name in
the drop list, but when it is serialized and sent back to the server, the id is what is actually
sent?  When I simply setListData(myArrayofHashMaps), the drop list actually displays the results
of the toString() method of each hash map, which is not what is desired.  It almost seems
like the ButtonList.setListData() method will only accept a one dimensional array of strings.

Again, as Todd suggested, a custom renderer is probably what you want here. I am doing the
same thing in my current app. For ListButton, you'll probably need two custom renderers: one
for the selected button data and another for the list items. Simplest thing to do is extend
the default renderers (in org.apache.pivot.wtk.content), use JSONSerializer to extract the
value you need, then pass it to the base render() method.


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