Reading big JTable from disk one page at a time

Hi,
I'm trying to display a JTable in its JScrollPane
for a large amount of data (say 40'000 records).
Scrolling is quite smart, since it does a relatively
good job when the user drags the knob, e.g. in order
to reach the bottom. However, it leaves something to
be desired. Any pointer to some example implementation?
In particular, the table model should know how many
records are displayed at a time, and I found no easy
way for determining it. (I didn't make the table
editable yet, but the current page is needed whenever
the table is repainted, so it better be cashed.)
And, in some cases it would be better to not update
the view and just display a tooltip while the knob
is being dragged. That would cause much less reading.
In general, I need to adjust the cashing strategy
in order to accomplish what JScrollPane is doing.
Should I subclass it? Or should I subclass JTable?
TIA
Ale

In particular, the table model should know how many
records are displayed at a time, and I found no easy
way for determining it. (I didn't make the table
editable yet, but the current page is needed whenever
the table is repainted, so it better be cashed.)There are at least two ways of finding the beginning row/column and ending row/column of the viewport. One of which is by using the JScrollBar getValue() and the other is to use the JTable getVisibleRect() method -- with either method, you will need to convert it to Point and use the JTable rowAtPoint() and columnAtPoint() to translate the point to row/column index.
And, in some cases it would be better to not update
the view and just display a tooltip while the knob
is being dragged. That would cause much less reading.The best way to do this is to extend the BasicScrollPaneUI and implement your own ChangeListeners for the vertical and horizontal scroll bars as well as the viewport.
Good Luck!
;o)
V.V.

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