Is it difficult to speed up the scroll of JScrollPane content ? It is too 
slow for me, if I use the mouse wheel or arrows of a slider. 

Dado wrote:
> Is it difficult to speed up the scroll of JScrollPane content ? It is too
> slow for me, if I use the mouse wheel or arrows of a slider.

You'll have to override the scrollable increment methods in your
scrollable component (the thing you add to the scrollpane). Following
code makes scrolling in a JEditorPane really slow. The numeric values
are the number of pixels the view should be moved for a click on the
arrow or in the gray area of the scrollbar.

JEditorPane ePane = new JEditorPane(url) {
    public int getScrollableUnitIncrement(Rectangle visibleRect, int
orientation, int direction) {
        return 1;
    }

    public int getScrollableBlockIncrement(Rectangle visibleRect, int
orientation, int direction) {
        return 2;
    }
};

Regards,

Bart

Bart Cremers wrote:
> Dado wrote:
>> Is it difficult to speed up the scroll of JScrollPane content ? It is too
>> slow for me, if I use the mouse wheel or arrows of a slider.
> 
> You'll have to override the scrollable increment methods in your
> scrollable component (the thing you add to the scrollpane). Following
> code makes scrolling in a JEditorPane really slow. The numeric values
> are the number of pixels the view should be moved for a click on the
> arrow or in the gray area of the scrollbar.
> 
> JEditorPane ePane = new JEditorPane(url) {
>     public int getScrollableUnitIncrement(Rectangle visibleRect, int
> orientation, int direction) {
>         return 1;
>     }
> 
>     public int getScrollableBlockIncrement(Rectangle visibleRect, int
> orientation, int direction) {
>         return 2;
>     }
> };
> 
> Regards,
> 
> Bart
> 

Why override when he can simply do the following to the scrollpane itself?

myScrollPane.getHorizontalScrollBar().setUnitIncrement(10);
myScrollPane.getVerticalScrollBar().setUnitIncrement(10);

Those work fine for me when having a jlist in a scrollpane.

Brandon McCombs wrote:
> Bart Cremers wrote:
> > Dado wrote:
> >> Is it difficult to speed up the scroll of JScrollPane content ? It is too
> >> slow for me, if I use the mouse wheel or arrows of a slider.
> >
> > You'll have to override the scrollable increment methods in your
> > scrollable component (the thing you add to the scrollpane). Following
> > code makes scrolling in a JEditorPane really slow. The numeric values
> > are the number of pixels the view should be moved for a click on the
> > arrow or in the gray area of the scrollbar.
> >
> > JEditorPane ePane = new JEditorPane(url) {
> >     public int getScrollableUnitIncrement(Rectangle visibleRect, int
> > orientation, int direction) {
> >         return 1;
> >     }
> >
> >     public int getScrollableBlockIncrement(Rectangle visibleRect, int
> > orientation, int direction) {
> >         return 2;
> >     }
> > };
> >
> > Regards,
> >
> > Bart
> >
>
> Why override when he can simply do the following to the scrollpane itself?
>
> myScrollPane.getHorizontalScrollBar().setUnitIncrement(10);
> myScrollPane.getVerticalScrollBar().setUnitIncrement(10);
>
> Those work fine for me when having a jlist in a scrollpane.

Damn, I was looking for such method in JScrollPane and in JViewport,
never occured to me to look on the scrollbars to set them.

Thanks,

Bart

JScrollBar.setUnitIncrement

-- 
Thomas A. Russ,  USC/Information Sciences Institute