public void setStartEndSeq(int start, int end)
{
int oldstartseq = this.startSeq;
- if (start > getVisibleAlignmentHeight() - 1)
+ int visibleHeight = getVisibleAlignmentHeight();
+ if (start > visibleHeight - 1)
{
- startSeq = Math.max(getVisibleAlignmentHeight() - 1, 0);
+ startSeq = Math.max(visibleHeight - 1, 0);
}
else if (start < 0)
{
}
int oldendseq = this.endSeq;
- if (end >= getVisibleAlignmentHeight())
+ if (end >= visibleHeight)
{
- endSeq = Math.max(getVisibleAlignmentHeight() - 1, 0);
+ endSeq = Math.max(visibleHeight - 1, 0);
}
else if (end < 0)
{
{
if (wrappedMode)
{
- setStartRes(getStartRes() - getViewportWidth());
+ setStartRes(Math.max(0, getStartRes() - getViewportWidth()));
}
else
{
{
wrappedMode = wrapped;
}
+
+ /**
+ * Answers the vertical scroll position (0..) to set, given the visible column
+ * that is at top left. Note that if called with the total visible width of
+ * the alignment, this gives the maximum cursor scroll value.
+ *
+ * <pre>
+ * Example:
+ * viewport width 40 columns (0-39, 40-79, 80-119...)
+ * column 0 returns scroll position 0
+ * columns 0-40 return scroll position 1
+ * columns 41-80 return scroll position 2
+ * etc
+ * </pre>
+ *
+ * @param topLeftColumn
+ * (0..)
+ * @return
+ */
+ public int getWrappedScrollPosition(final int topLeftColumn)
+ {
+ int w = getViewportWidth();
+
+ /*
+ * visible whole widths
+ */
+ int scroll = topLeftColumn / w;
+ scroll += topLeftColumn % w > 0 ? 1 : 0;
+
+ return scroll;
+ }
}