I have a JTable that has columns selected from a options dialog. The problem is that the user can move a selected column up or down, thereby changing its order in the JTable.
Since I am just hiding the columns that the user did not select, will the
getValueAt(int nRow, int nCol) method still work? I am not sure if the nCol value will get messed up when the user changes the sequence of the columns.
TIA.
Hiding the columns does not change the index. However the user can change the sequence of the columns in the table. To change the sequence of a jtable during runtime requires moveColumn(vSrcColIndex, vDstColIndex); method.
The sequence of the columns is 0,1,2 in the beginning. After the user makes the selection it is in random order 1,0,2 or something else.
So the question is:
What should be index values for the moveColumn method? or How to associate the random order with the index of moveColumn method?
Hi Balu,
Any how u have required all the columns of a table in ur scenario.. And also u cannot delete a column from the table.
For that just hide that particular column by using setpreffered width as Zero...
Eg: If u want to hide a cloumn5 ..then write as follows
column5.setPreferredWidth(0);
column5.setMaxWidth(0);
and keep continue to give size to other columns which u requied in ur table..
U have to write a getValue() for all the columns of the Table event though u may not require some of the columns.......
Try on this .....
Regards,
Vk
But the problem is U have to write a unique getValueat() method for ur table
How is this a problem?
Even u dynamically displays the tables definetly u face problem when u want to populate the data into the table columns
No you don't. You have two models. Let's say you use a normal DefaultTableModel (it can be any TableModel) object to actually store your data. Then you have your, say, "ColumnFilteringTableModel" object which references the underlying model and delegates its get/set/editable etc methods to it after modifying the column index accordingly.
You feed your ColumnFilteringTableModel object to the JTable.
You manipulate the data in your DefaultTableModel object.
It works fine, I've already written code which does eactly that :o)
Camickr, it's not that simple to find the pattern. Here is why:
Let's say the initial sequence is [a,b,c,d,e,f] when the user modifies this, it could become [f,a,d,c,b,e]. Your logic will not work in this case.
Tip from Java Almanac :
Converting a Column Index Between the View and Model in a JTable Component
A column in a JTable component has two types of indices, a visible index and a model index. The visible index of a column is its visible location on the screen. The model index of a column is its permanent position in a TableModel, which contains the actual data. This example demonstrates how to convert a column index between the two forms.
Even if I convert the view index to model index I still need to know whether to move up or down and by how many units. Any ideas on this?
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