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From: Martin Gregorie <martin@address-in-sig.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: Swing - Using JTabbedPane
Date: Sun, 17 Jan 2016 20:00:28 -0000 (UTC)
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On Sun, 17 Jan 2016 09:49:45 -0800, Knute Johnson wrote:

> On 1/17/2016 06:35, galt_57@hotmail.com wrote:
>> On Saturday, January 16, 2016 at 1:32:07 PM UTC-6, Jeff Higgins wrote:
>>> On Sat, 16 Jan 2016 07:53:54 -0800, galt_57 wrote:
>>>
>>>> So I'm throwing JTables into JScrollPanes and then adding them as new
>>>> tabs,
>>>
>>> You've not shown any of this code.
>>>
>>>> but when I want to read the selected table again later, I'm not sure
>>>> what to do.
>>>
>>> Here are some resources to help you figure it out.
>>>
>>> Java SE API Documentation
>>> https://docs.oracle.com/javase/8/docs/api/index.html
>>>
>>> The Java(tm) Tutorials - Creating a GUI with Swing
>>> https://docs.oracle.com/javase/tutorial/uiswing/index.html
>>>
>>>> Right now the code below seems to be working,
>>>
>>> Great!
>>>
>>>> but I'm not sure if it is a good approach.
>>>
>>> Impossible to tell without the rest of the code.
>>>
>>>> Also JViewport is a mystery.
>>>
>>> See the above resources.
>>>
>>>
>> Thanks for the references.
>>
>> Let me post a correction to my original code and add a summary of how I
>> create the tab...
>>
>> JTable jt;
>> DefaultTableModel mod;
>> .
>> . //fill the table body .
>> JScrollPane sp = new JScrollPane(jt);
>> jTabbedPane01.addTab(tabname,sp); // so here the tab has been created
>>
>> ----------------
>>
>> // in the routine below I want to read the jtable in the selected
>> tab...
>>
>> int tab = jTabbedPane01.getSelectedIndex();
>>
>> if (tab == -1){
>>     statusMessageLabel.setText("Error: no tab selected.");
>>     return;
>> }
>>
>> Component csp = jTabbedPane01.getComponentAt(tab);
>> Component cvp;
>> Component cjt;
>>
>> JTable jt = null;
>>
>> if (csp instanceof JScrollPane){
>>      cvp = ((JScrollPane)csp).getComponent(0);
>>      if (cvp instanceof JViewport){
>>          cjt = ((JViewport)cvp).getComponent(0);
>>          if (cjt instanceof JTable){
>>              jt = (JTable)cjt;
>>          }
>>      }
>> }
>>
>> if (jt == null){
>>      statusMessageLabel.setText("Error: selected tab "+ tab + " is not
>>      a table.");
>>      return;
>> }
>>
>>
> This seems like a lot of work to find your JTables when you could just
> keep a list of references to them somewhere.  That way, you wouldn't
> care what your component hierarchy was and you could change it without
> having to rewrite your code.
>
Nice one. 

A further thought: if you use a Map to store the reference list you can 
use the name of the corresponding as the reference key for each JTable. 
That could also be generalised into a list of class instances, each 
holding the data and class references you need externally to manage the 
content of each JScrollPanel.


-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |