01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * 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: }
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