FireTableRowsInserted looses mouse focus on scroll button

Question

Hello,
I created a simple caching TableModel which reads data from database table. Data is cached internally in a vector which holds initially 100 rows. When scrolling down and reaching the 100th row I fetch the next 100 rows from the database table and add them to the vector.
So far, so good. But after reading from the database table I need to call fireTableRowsInserted which causes the scrolling (pressing the scroll-down-button all the time) to stop. So I need to press again on the scroll-down-button to restart scrolling down.
Is there a remedy to make scrolling more "fluid"?
This does not happen when scrolling down with cursor keys (scrolling one row a time) or clicking in the scrollbar track area, and it would be nice if it would behave the same when clicking on the scroll-down-button.
Thank you very much for any good advice.
Stephan

Answer 1

Hi Stephan,
I suggest you try the following code sample, which seems to work although some better code could perhaps be found:
public class Frame extends JFrame {
    private JTable table;
    private JScrollPane scrollPane;
    private boolean scrolling = false;
    private Object scrollingLock = new Object();
    ... // other attributes
    public Frame() {
        ... // init the frame
        table = new JTable();
        ... // init the table
        scrollPane = new JScrollPane();
        scrollPane.setViewportView(table);
        ... // init the scroll pane
        scrollPane.getVerticalScrollBar().addAdjustmentListener(new AdjustmentListener() {
            public void adjustmentValueChanged(final AdjustmentEvent e) {
                synchronized(scrollingLock) {
                    if (!scrollingLock) {
                        scrollingLock = true;
                        scrollPane.setViewportView(null);
                        // fetch the next rows and add them to the table
                        scrollPane.setViewportView(table);
                        scrollingLock = false;
    ... // other methods
}I hope this will help you!
Pierre-Vincent