+ * Adjusts the divider for a sensible split of the real estate (for example,
+ * when many transcripts are shown with a single protein). This should only be
+ * called after the split pane has been laid out (made visible) so it has a
+ * height. The aim is to avoid unnecessary vertical scroll bars, while
+ * ensuring that at least 2 sequences are visible in each panel.
+ * <p>
+ * Once laid out, the user may choose to customise as they wish, so this
+ * method is not called again after the initial layout.
+ */
+ protected void adjustInitialLayout()
+ {
+ AlignFrame topFrame = (AlignFrame) getTopFrame();
+ AlignFrame bottomFrame = (AlignFrame) getBottomFrame();
+
+ /*
+ * recompute layout of top and bottom panels to reflect their
+ * actual (rather than requested) height
+ */
+ topFrame.alignPanel.adjustAnnotationHeight();
+ bottomFrame.alignPanel.adjustAnnotationHeight();
+
+ final AlignViewport topViewport = topFrame.viewport;
+ final AlignViewport bottomViewport = bottomFrame.viewport;
+ final AlignmentI topAlignment = topViewport.getAlignment();
+ final AlignmentI bottomAlignment = bottomViewport.getAlignment();
+ boolean topAnnotations = topViewport.isShowAnnotation();
+ boolean bottomAnnotations = bottomViewport.isShowAnnotation();
+ // TODO need number of visible sequences here, not #sequences - how?
+ int topCount = topAlignment.getHeight();
+ int bottomCount = bottomAlignment.getHeight();
+ int topCharHeight = topViewport.getViewStyle().getCharHeight();
+ int bottomCharHeight = bottomViewport.getViewStyle().getCharHeight();
+
+ /*
+ * calculate the minimum ratio that leaves at least the height
+ * of two sequences (after rounding) visible in the top panel
+ */
+ int topPanelHeight = topFrame.getHeight();
+ int bottomPanelHeight = bottomFrame.getHeight();
+ int topSequencesHeight = topFrame.alignPanel.getSeqPanel().seqCanvas
+ .getHeight();
+ int topPanelMinHeight = topPanelHeight
+ - Math.max(0, topSequencesHeight - 3 * topCharHeight);
+ double totalHeight = (double) topPanelHeight + bottomPanelHeight;
+ double minRatio = topPanelMinHeight / totalHeight;
+
+ /*
+ * calculate the maximum ratio that leaves at least the height
+ * of two sequences (after rounding) visible in the bottom panel
+ */
+ int bottomSequencesHeight = bottomFrame.alignPanel.getSeqPanel().seqCanvas
+ .getHeight();
+ int bottomPanelMinHeight = bottomPanelHeight
+ - Math.max(0, bottomSequencesHeight - 3 * bottomCharHeight);
+ double maxRatio = (totalHeight - bottomPanelMinHeight) / totalHeight;
+
+ /*
+ * estimate ratio of (topFrameContent / bottomFrameContent)
+ */
+ int insets = Platform.isAMac() ? MAC_INSETS_HEIGHT
+ : WINDOWS_INSETS_HEIGHT;
+ // allow 3 'rows' for scale, scrollbar, status bar
+ int topHeight = insets + (3 + topCount) * topCharHeight
+ + (topAnnotations ? topViewport.calcPanelHeight() : 0);
+ int bottomHeight = insets + (3 + bottomCount) * bottomCharHeight
+ + (bottomAnnotations ? bottomViewport.calcPanelHeight() : 0);
+ double ratio = ((double) topHeight)
+ / (double) (topHeight + bottomHeight);
+
+ /*
+ * limit ratio to avoid concealing all sequences
+ */
+ ratio = Math.min(ratio, maxRatio);
+ ratio = Math.max(ratio, minRatio);
+ setRelativeDividerLocation(ratio);
+ }
+
+ /**