X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fgui%2FSplitFrame.java;h=5bff407860c8fc9bb1738639503bb6e9c5da4d30;hb=406e7b1a013740e38221de3a0621232aa229093e;hp=beb2d628e76cd902d4e60745e13107d1c9ec9d08;hpb=3d0101179759ef157b088ea135423cd909512d9f;p=jalview.git

diff --git a/src/jalview/gui/SplitFrame.java b/src/jalview/gui/SplitFrame.java
index beb2d62..5bff407 100644
--- a/src/jalview/gui/SplitFrame.java
+++ b/src/jalview/gui/SplitFrame.java
@@ -194,15 +194,29 @@ public class SplitFrame extends GSplitFrame implements SplitContainerI
   }
 
   /**
-   * Adjust the divider for a sensible split of the real estate (for example,
+   * 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.
+   * 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 adjustDivider()
+  protected void adjustInitialLayout()
   {
-    final AlignViewport topViewport = ((AlignFrame) getTopFrame()).viewport;
-    final AlignViewport bottomViewport = ((AlignFrame) getBottomFrame()).viewport;
+    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();
@@ -214,6 +228,29 @@ public class SplitFrame extends GSplitFrame implements SplitContainerI
     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
@@ -223,13 +260,14 @@ public class SplitFrame extends GSplitFrame implements SplitContainerI
             + (topAnnotations ? topViewport.calcPanelHeight() : 0);
     int bottomHeight = insets + (3 + bottomCount) * bottomCharHeight
             + (bottomAnnotations ? bottomViewport.calcPanelHeight() : 0);
-    double ratio = ((double) topHeight) / (topHeight + bottomHeight);
+    double ratio = ((double) topHeight)
+            / (double) (topHeight + bottomHeight);
 
     /*
-     * limit to 0.2 <= ratio <= 0.8 to avoid concealing all sequences
+     * limit ratio to avoid concealing all sequences
      */
-    ratio = Math.min(ratio, 0.8d);
-    ratio = Math.max(ratio, 0.2d);
+    ratio = Math.min(ratio, maxRatio);
+    ratio = Math.max(ratio, minRatio);
     setRelativeDividerLocation(ratio);
   }