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- /*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
- /* $Id$ */
-
- package org.apache.fop.layoutmgr;
-
- import java.util.LinkedList;
-
- import org.apache.fop.layoutmgr.SpaceResolver.SpaceHandlingBreakPosition;
-
- /**
- * Utility class which provides common code for the addAreas stage.
- */
- public final class AreaAdditionUtil {
-
- private AreaAdditionUtil() {
- }
-
- /**
- * Creates the child areas for the given layout manager.
- * @param parentLM the parent layout manager
- * @param parentIter the position iterator
- * @param layoutContext the layout context
- */
- public static void addAreas(AbstractLayoutManager parentLM,
- PositionIterator parentIter, LayoutContext layoutContext) {
- LayoutManager childLM;
- LayoutContext lc = LayoutContext.offspringOf(layoutContext);
- LayoutManager firstLM = null;
- LayoutManager lastLM = null;
- Position firstPos = null;
- Position lastPos = null;
-
- if (parentLM != null) {
- parentLM.addId();
- }
-
- // "unwrap" the NonLeafPositions stored in parentIter
- // and put them in a new list;
- LinkedList<Position> positionList = new LinkedList<Position>();
- Position pos;
- while (parentIter.hasNext()) {
- pos = parentIter.next();
- if (pos == null) {
- continue;
- }
- if (pos.getIndex() >= 0) {
- if (firstPos == null) {
- firstPos = pos;
- }
- lastPos = pos;
- }
- if (pos instanceof NonLeafPosition) {
- // pos was created by a child of this FlowLM
- positionList.add(pos.getPosition());
- lastLM = (pos.getPosition().getLM());
- if (firstLM == null) {
- firstLM = lastLM;
- }
- } else if (pos instanceof SpaceHandlingBreakPosition) {
- positionList.add(pos);
- } else {
- // pos was created by this LM, so it must be ignored
- }
- }
- if (firstPos == null) {
- return; //Nothing to do, return early
- //TODO This is a hack to avoid an NPE in the code block below.
- //If there's no firstPos/lastPos there's currently no way to
- //correctly determine first and last conditions. The Iterator
- //doesn't give us that info.
- }
-
- if (parentLM != null) {
- parentLM.registerMarkers(
- true,
- parentLM.isFirst(firstPos),
- parentLM.isLast(lastPos));
- }
-
- PositionIterator childPosIter = new PositionIterator(positionList.listIterator());
-
- while ((childLM = childPosIter.getNextChildLM()) != null) {
- // TODO vh: the test above might be problematic in some cases. See comment in
- // the TableCellLM.getNextKnuthElements method
- // Add the block areas to Area
- lc.setFlags(LayoutContext.FIRST_AREA, childLM == firstLM);
- lc.setFlags(LayoutContext.LAST_AREA, childLM == lastLM);
- // set the space adjustment ratio
- lc.setSpaceAdjust(layoutContext.getSpaceAdjust());
- // set space before for the first LM, in order to implement
- // display-align = center or after
- lc.setSpaceBefore((childLM == firstLM ? layoutContext.getSpaceBefore() : 0));
- // set space after for each LM, in order to implement
- // display-align = distribute
- lc.setSpaceAfter(layoutContext.getSpaceAfter());
- lc.setStackLimitBP(layoutContext.getStackLimitBP());
- childLM.addAreas(childPosIter, lc);
- }
-
- if (parentLM != null) {
- parentLM.registerMarkers(
- false,
- parentLM.isFirst(firstPos),
- parentLM.isLast(lastPos));
- }
-
-
- }
-
- }
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