How do I speed up the scroll speed in a JScrollPane when using the mouse wheel?
JavaSwingScrollJscrollpaneMousewheelJava Problem Overview
I see the method JScrollPane.setWheelScrollingEnabled(boolean)
to enable or disable the mouse wheel scrolling. Is there any way to adjust the speed of the scrolling, though? It is, in my opinion, ludicrously slow. No matter what size I make the window, the scrolling is about three pixels per click. I'd like it to be much more than that.
Any ideas?
Java Solutions
Solution 1 - Java
You can try this :
myJScrollPane.getVerticalScrollBar().setUnitIncrement(16);
Solution 2 - Java
One way would be to set the unit increment of the scrollbar to a larger number:
scrollPane.getVerticalScrollBar().setUnitIncrement(20);
Solution 3 - Java
You can do this by setting the unit increment for a ScrollBar. See the example.
yourScrollPane.getVerticalScrollBar().setUnitIncrement(16);
Solution 4 - Java
If you want to set the mouse wheel scroll amount indepedent of the scrollbar unit amout you can use the Mouse Wheel Controller.
Solution 5 - Java
A quick search brought up this page: How to increase the JScrollPane scrolling speed for mousewheel users. It turns out that the scrolling increment is a property of the scroll bar itself (JScrollBar.setUnitIncrement
) and not the scroll pane.
Solution 6 - Java
For more precise control, the component being scrolled can implement the Scrollable interface. This allows you to dynamically calculate the scrolling unit size (arrow buttons and arrow keys) and the scrolling block size (mouse wheel).
Solution 7 - Java
I was trying to find a better method to read through 32000 lines in my ScrollPane
try this
scrollPane.getVerticalScrollBar().setUnitIncrement(100); scrollPane.getViewport().putClientProperty("EnableWindowBlit", Boolean.TRUE); scrollPane.getViewport().setScrollMode(JViewport.BACKINGSTORE_SCROLL_MODE);
Solution 8 - Java
You can also use this.
SwingUtil.setScrollUnitIncrement(yourScrollPane);
Solution 9 - Java
My solution to speeding up the scroll:
-
Add scrollbar's parameter:
scrollPane.getVerticalScrollBar().putClientProperty("JScrollBar.fastWheelScrolling", true);
-
Implement a wheel listener (on the component inside jViewport):
public void mouseWheelMoved(MouseWheelEvent e) { boolean isCtrl = (e.getModifiersEx() & MouseWheelEvent.CTRL_DOWN_MASK) != 0; boolean isShift = (e.getModifiersEx() & MouseWheelEvent.SHIFT_DOWN_MASK) != 0; MouseWheelEvent eventToDispatch = e; if (isCtrl || isShift) { int amountMulti = 1; int rotMulti = 1; if (isCtrl) { amountMulti *= 10; if (isShift) { amountMulti *= 5; rotMulti *= 2; } } int mod = e.getModifiers() & ~InputEvent.CTRL_MASK & ~InputEvent.SHIFT_MASK; int modEx = e.getModifiersEx() & ~MouseWheelEvent.CTRL_DOWN_MASK & ~MouseWheelEvent.SHIFT_DOWN_MASK; eventToDispatch = new MouseWheelEvent(this, e.getID(), e.getWhen() , mod | modEx, e.getX(), e.getY() , e.getXOnScreen(), e.getYOnScreen(), e.getClickCount(), e.isPopupTrigger() , e.getScrollType(), e.getScrollAmount()*amountMulti, e.getWheelRotation()*rotMulti , e.getPreciseWheelRotation()*amountMulti*rotMulti); } getParent().dispatchEvent(eventToDispatch); }
The increase of wheelRotation is necessary: otherwise the number of scrolled lines will be limited to the size of the screen.