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/*
* $Id$
* Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
* For details on use and redistribution please refer to the
* LICENSE file included with these sources.
*/
package org.apache.fop.layoutmgr;
import org.apache.fop.area.Area;
/**
* The interface for all BreakPoss LayoutManagers.
*/
public interface BPLayoutManager extends LayoutManager {
/**
* Return true if the next area which would be generated by this
* LayoutManager could start a new line (or flow for block-level FO).
*/
public boolean canBreakBefore(LayoutContext lc);
/**
* Generate and return the next break possibility.
* @param context The layout context contains information about pending
* space specifiers from ancestor areas or previous areas, reference
* area inline-progression-dimension and various other layout-related
* information.
* @param prevBreakPosition If not null, gives a Position returned by
* this layout manager on a previous call to getNextBreakPoss. It may not
* be the previous one returned. The Layout Manager should return the next
* potential Break Possibility after prevBreakPosition.
* If prevBreakPosition is null, it should return the first possible
* BreakPoss.
*/
public BreakPoss getNextBreakPoss(LayoutContext context,
BreakPoss.Position prevBreakPosition);
public BreakPoss getNextBreakPoss(LayoutContext context);
/** CURRENTLY NOT USED
public BreakPoss getStartBreakPoss(LayoutContext lc,
BreakPoss.Position bpPrevEnd);
**/
/**
* Return a value indicating whether this LayoutManager has laid out
* all its content (or generated BreakPossibilities for all content.)
*/
public boolean isFinished() ;
/**
* Set a flag indicating whether the LayoutManager has laid out all
* its content. This is generally called by the LM itself, but can
* be called by a parentLM when backtracking.
*/
public void setFinished(boolean isFinished) ;
/**
* Tell the layout manager to add all the child areas implied
* by BreakPoss.Position objectw which will be returned by the
* Iterator.
*/
public void addAreas(PositionIterator posIter) ;
public void init() ;
public void resetPosition(BreakPoss.Position position);
}
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