- // get the width of the canvas in residues
- int canvasWidth = seqPanel.seqCanvas
- .getWrappedCanvasWidth(seqPanel.seqCanvas.getSize().width);
- if (canvasWidth > 0)
- {
- // position we want to scroll to is number of canvasWidth's to get there
- int current = res / canvasWidth;
-
- // max scroll position: add one because extent is 1 and scrollbar value
- // can only be set to at most max - extent
- int max = maxwidth / canvasWidth + 1;
- vscroll.setUnitIncrement(1);
- vscroll.setValues(current, 1, 0, max);
- }
+ /*
+ * a scrollbar's value can be set to at most (maximum-extent)
+ * so we add extent (1) to the maxScroll value
+ */
+ vscroll.setUnitIncrement(1);
+ vscroll.setValues(scrollPosition, 1, 0, maxScroll + 1);