This patch implements a pluggable LayoutManagers system, according

to the ideas of Finn Bock and his patch in bug 30500.

Created a LayoutManagerMaker interface, with method
makeLayoutManagers(FONode, List), and two convenience methods on top
of it.

Created an implementation: LayoutManagerMapping. This is along the
pattern of FOElementMapping. It creates a Map from FObj class to Maker
objects. There are many static inner classes which are subclasses of
Maker. Each subclass implements its own version of the make method.

FOUserAgent has a setter and getter for
LayoutManagerMakerOverride. AreaTreeHandler creates a
LayoutManagerMaker, taking the user's override into account, using
LayoutManagerMapping as the default. It has a get method for it.

The LayoutManager interface has a get method for the AreaTreeHandler
object, a reference to which is held in PageSequenceLM, the top of the
LM tree.


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@198208 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 6 insertions, 0 deletions

diff --git a/src/java/org/apache/fop/layoutmgr/LayoutManager.java b/src/java/org/apache/fop/layoutmgr/LayoutManager.java
index bdc25e605..6291a058b 100644
--- a/src/java/org/apache/fop/layoutmgr/LayoutManager.java
+++ b/src/java/org/apache/fop/layoutmgr/LayoutManager.java
@@ -26,6 +26,7 @@ import org.apache.fop.fo.flow.Marker;
 import org.apache.fop.area.Area;
 import org.apache.fop.area.Resolvable;
 import org.apache.fop.area.PageViewport;
+import org.apache.fop.area.AreaTreeHandler;
 import org.apache.fop.fo.FObj;
 
 /**
@@ -212,6 +213,11 @@ public interface LayoutManager {
     Marker retrieveMarker(String name, int pos, int boundary);
 
     /**
+     * @return the AreaTreeHandler object.
+     */
+    AreaTreeHandler getAreaTreeHandler();
+
+    /**
      * Load next child LMs, up to child LM index pos
      * @param pos index up to which child LMs are requested
      * @return if requested index does exist