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javaswingjscrollpanejscrollbar

Smoother scrolling in a JScrollPane

Using a JScrollPane's scrollbar arrows to scroll (or by setting up key bindings for the arrow keys) moves the viewport one increment, pauses, then scrolls smoothly. Most scrollbars I've encountered behave the same; there's a slight movement, a pause, and then faster continuous scrolling. Is there any way to avoid the pause, so that scrolling is smooth from start to finish?

Solution

  • The BasicScrollBarUI is responsible for setting up the timer that does the scrolling.

    private final static int scrollSpeedThrottle = 60; // delay in milli seconds
...
scrollListener = createScrollListener();
scrollTimer = new Timer(scrollSpeedThrottle, scrollListener);
scrollTimer.setInitialDelay(300);  // default InitialDelay?

    You can see that the repeat rate is faster than the initial delay.

    So I would guess you need to create a custom scrollbar UI and override that code.