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Java > Open Source Codes > org > apache > fop > layoutmgr > BlockLevelLayoutManager


1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18 /* $Id: BlockLevelLayoutManager.java 426576 2006-07-28 15:44:37Z jeremias $ */
19  
20 package org.apache.fop.layoutmgr;
21
22 /**
23  * The interface for LayoutManagers which generate block areas
24  */
25 public interface BlockLevelLayoutManager extends LayoutManager {
26
27     /** Adjustment class: no adjustment */
28     int NO_ADJUSTMENT = -1;
29     /** Adjustment class: adjustment for space-before */
30     int SPACE_BEFORE_ADJUSTMENT = 0;
31     /** Adjustment class: adjustment for space-after */
32     int SPACE_AFTER_ADJUSTMENT = 1;
33     /** Adjustment class: adjustment for number of lines */
34     int LINE_NUMBER_ADJUSTMENT = 2;
35     /** Adjustment class: adjustment for line height */
36     int LINE_HEIGHT_ADJUSTMENT = 3;
37
38     int negotiateBPDAdjustment(int adj, KnuthElement lastElement);
39
40     void discardSpace(KnuthGlue spaceGlue);
41
42     /**
43      * @return true if this element must be kept together
44      */
45     boolean mustKeepTogether();
46
47     /**
48      * @return true if this element must be kept with the previous element.
49      */
50     boolean mustKeepWithPrevious();
51
52     /**
53      * @return true if this element must be kept with the next element.
54      */
55     boolean mustKeepWithNext();
56
57 }
58
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