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Groups > comp.lang.java.programmer > #38594

Re: Displaying a ragged array

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On 2018-09-17 00:17, Martin Gregorie wrote:
> I'm in the process of creating a desktop application to display and edit
> data that's best treated as a ragged array of Strings: it is quite
> unlikely that all rows in the array will be the same length.
> 
> I've built and debugged a Datastore class to hold it as an ArrayList of
> ArrayList<String>  - the ArrayList<String> being in a wrapper class
> representing a row of fields. The DataStore allows rows, columns and
> individual fields to be inserted, deleted, and the fields to be modified.
> 
> Datastore extends AbstractTableModel because I was initially intending to
> use a JTable to display and manipulate its contents, but now its
> successfully manipulating the ragged array I'm having twinges of doubt
> about how whether a JTable can is the best way of displaying it and
> allowing it to be viewed and modified, i.e. can a JTable deal successfully
> with the missing elements at the end of rows in a ragged array?
> 
> Would I be better off with a custom built structure containing, say, an
> array of JButtons to display fields in the ragged array and that can be
> clicked to add a field, edit or delete it?
> 
> I'll be very interested to hear how you've handled, or would handle, this
> display problem.
> 
> Datastore extends AbstractTableModel

I think you should compose, rather than inherit that (i.e. a
DatastoreTableModel layer).

> can a JTable deal successfully
> with the missing elements at the end of rows in a ragged array

I don't see why it wouldn't (all you need to do is render missing values
properly, see below). Also, will missing elements always be at the end,
rather than interspersed?

> I'll be very interested to hear how you've handled, or would handle, this
> display problem.

A _display_ problem I would address at the _rendering_ level, rather
than the model level. That is, using the TableCellRenderer and
TableCellEditor.

-- 
DF.

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Thread

Displaying a ragged array Martin Gregorie <martin@mydomain.invalid> - 2018-09-16 22:17 +0000
  Re: Displaying a ragged array Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2018-09-17 16:00 +0200
    Re: Displaying a ragged array Martin Gregorie <martin@mydomain.invalid> - 2018-09-17 19:32 +0000
      Re: Displaying a ragged array Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2018-09-17 23:29 +0200
        Re: Displaying a ragged array Martin Gregorie <martin@mydomain.invalid> - 2018-09-17 23:43 +0000
          Re: Displaying a ragged array Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2018-09-19 18:12 +0200
            Re: Displaying a ragged array Martin Gregorie <martin@mydomain.invalid> - 2018-09-19 17:49 +0000
              Re: Displaying a ragged array Eric Sosman <esosman@comcast-dot-net.invalid> - 2018-09-19 14:25 -0400
                Re: Displaying a ragged array Martin Gregorie <martin@mydomain.invalid> - 2018-09-19 19:29 +0000
                Re: Displaying a ragged array Daniele Futtorovic <da.futt.news@laposte-dot-net.invalid> - 2018-09-20 15:30 +0200
                Re: Displaying a ragged array Martin Gregorie <martin@mydomain.invalid> - 2018-09-20 15:06 +0000
              Re: Displaying a ragged array Eric Douglas <e.d.programmer@gmail.com> - 2018-09-24 08:11 -0700
                Re: Displaying a ragged array Martin Gregorie <martin@mydomain.invalid> - 2018-09-24 17:52 +0000
                Re: Displaying a ragged array Eric Douglas <e.d.programmer@gmail.com> - 2018-09-24 12:01 -0700
                Re: Displaying a ragged array Martin Gregorie <martin@mydomain.invalid> - 2018-10-23 21:00 +0000
  Re: Displaying a ragged array Eric Sosman <esosman@comcast-dot-net.invalid> - 2018-09-17 10:17 -0400
    Re: Displaying a ragged array Martin Gregorie <martin@mydomain.invalid> - 2018-09-17 19:46 +0000
      Re: Displaying a ragged array Martin Gregorie <martin@mydomain.invalid> - 2018-09-17 23:53 +0000

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