Fixed row in JTable

Question

Dear All
Does anyone know how to fix a row in a JTable, for example, to fix the bottom row in a JTable, so that users can scroll through the rest of the rows in the table without affecting this row. But when if a column size is changed, it will resize its cell simultaneously.
if you know the answer, please provide sample code as well.
Thanks in advance
Ken

Answer 1

Hi,
to do that, you need an own DataModel in the table, I guess. What is displayed in a cell is asked from the JTable by the getValueAt(...)-method of the datamodel. If you want to fix a row that way, you have to answer this "question" with the right response - that will be not the original cell there but another one while scrolling during a row is fixed.
You also must keep track of the messages that are to be fired to synchronize the display of the table with the answers you return on the getValueAt(...)-method. The "fixing" is a kind of shifting the fixed row in the table, that must be reflected by the messages you have to fire. fireTableDataChanged() would be an idea but that cause rerendering of all the visible cells of the table - other messages are more precise, but you need to do more and have to worry about more things while programming this.
In the case of the bottom line it is possible to use a second JTable in the south of the panel which has only one row - the fixed row - in it - if you discard the header of it, it would look like the row is fixed in the original table, but by using this possibility you must synchronize the changing of the column-width and ofcourse the reordering of columns too done in the original table with the second table. I guess the method in the above paragraph would be the better approach to it.
I have no code for it, but I have tried, to give you a guideline how this can be done.
greetings Marsian