+
+ /**
+ * Follow a scrolling change in the (cDNA/Protein) complementary alignment.
+ * The aim is to keep the two alignments 'lined up' on their centre columns.
+ *
+ * @param sr
+ * holds mapped region(s) of this alignment that we are scrolling
+ * 'to'; may be modified for sequence offset by this method
+ * @param seqOffset
+ * the number of visible sequences to show above the mapped region
+ */
+ public void scrollToCentre(SearchResults sr, int seqOffset)
+ {
+ /*
+ * To avoid jumpy vertical scrolling (if some sequences are gapped or not
+ * mapped), we can make the scroll-to location a sequence above the one
+ * actually mapped.
+ */
+ SequenceI mappedTo = sr.getResultSequence(0);
+ List<SequenceI> seqs = av.getAlignment().getSequences();
+
+ /*
+ * This is like AlignmentI.findIndex(seq) but here we are matching the
+ * dataset sequence not the aligned sequence
+ */
+ int sequenceIndex = 0;
+ boolean matched = false;
+ for (SequenceI seq : seqs)
+ {
+ if (mappedTo == seq.getDatasetSequence())
+ {
+ matched = true;
+ break;
+ }
+ sequenceIndex++;
+ }
+ if (!matched)
+ {
+ return; // failsafe, shouldn't happen
+ }
+ sequenceIndex = Math.max(0, sequenceIndex - seqOffset);
+ sr.getResults().get(0)
+ .setSequence(av.getAlignment().getSequenceAt(sequenceIndex));
+
+ /*
+ * Scroll to position but centring the target residue.
+ */
+ scrollToPosition(sr, true, true);
+ }
+
+ /**
+ * Set a flag to say we are scrolling to follow a (cDNA/protein) complement.
+ *
+ * @param b
+ */
+ protected void setFollowingComplementScroll(boolean b)
+ {
+ this.followingComplementScroll = b;
+ }
+
+ protected boolean isFollowingComplementScroll()
+ {
+ return this.followingComplementScroll;
+ }