First part of the implementation of stage 1 for advanced keeps (see Wiki): Integer values are treated differently from "always" values in keep-together.within-column for all block-level FOs.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@648381 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 11 insertions, 0 deletions

diff --git a/src/java/org/apache/fop/layoutmgr/BlockLevelLayoutManager.java b/src/java/org/apache/fop/layoutmgr/BlockLevelLayoutManager.java
index 7e0e9e50e..3dc7ed46e 100644
--- a/src/java/org/apache/fop/layoutmgr/BlockLevelLayoutManager.java
+++ b/src/java/org/apache/fop/layoutmgr/BlockLevelLayoutManager.java
@@ -35,11 +35,22 @@ public interface BlockLevelLayoutManager extends LayoutManager {
     /** Adjustment class: adjustment for line height */
     int LINE_HEIGHT_ADJUSTMENT = 3;
 
+    /** The integer value for "auto" keep strength */
+    int KEEP_AUTO = Integer.MIN_VALUE;
+    /** The integer value for "always" keep strength */
+    int KEEP_ALWAYS = Integer.MAX_VALUE;
+    
     int negotiateBPDAdjustment(int adj, KnuthElement lastElement);
 
     void discardSpace(KnuthGlue spaceGlue);
 
     /**
+     * Returns the keep-together strength for this element.
+     * @return the keep-together strength
+     */
+    int getKeepTogetherStrength();
+
+    /**
      * @return true if this element must be kept together
      */
     boolean mustKeepTogether();