1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/*
* 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.Iterator;
import java.util.LinkedList;
import org.apache.fop.layoutmgr.SpaceResolver.SpaceHandlingBreakPosition;
/**
* Utility class which provides common code for the addAreas stage.
*/
public class AreaAdditionUtil {
private static class StackingIter extends PositionIterator {
StackingIter(Iterator parentIter) {
super(parentIter);
}
protected LayoutManager getLM(Object nextObj) {
return ((Position) nextObj).getLM();
}
protected Position getPos(Object nextObj) {
return ((Position) nextObj);
}
}
/**
* Creates the child areas for the given layout manager.
* @param bslm the BlockStackingLayoutManager instance for which "addAreas" is performed.
* @param parentIter the position iterator
* @param layoutContext the layout context
*/
public static void addAreas(BlockStackingLayoutManager bslm,
PositionIterator parentIter, LayoutContext layoutContext) {
LayoutManager childLM = null;
LayoutContext lc = new LayoutContext(0);
LayoutManager firstLM = null;
LayoutManager lastLM = null;
Position firstPos = null;
Position lastPos = null;
// "unwrap" the NonLeafPositions stored in parentIter
// and put them in a new list;
LinkedList positionList = new LinkedList();
Position pos;
while (parentIter.hasNext()) {
pos = (Position)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(((NonLeafPosition) pos).getPosition());
lastLM = ((NonLeafPosition) 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 (bslm != null) {
bslm.addMarkersToPage(
true,
bslm.isFirst(firstPos),
bslm.isLast(lastPos));
}
StackingIter childPosIter = new StackingIter(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 (bslm != null) {
bslm.addMarkersToPage(
false,
bslm.isFirst(firstPos),
bslm.isLast(lastPos));
}
}
}
|
