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org.apache.commons.jelly.tags.swing.BorderAlignTag |
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1 | /* |
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2 | * Copyright 2002,2004 The Apache Software Foundation. |
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3 | * |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 | * you may not use this file except in compliance with the License. |
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6 | * You may obtain a copy of the License at |
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7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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9 | * |
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10 | * Unless required by applicable law or agreed to in writing, software |
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11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 | * See the License for the specific language governing permissions and |
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14 | * limitations under the License. |
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15 | */ |
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16 | package org.apache.commons.jelly.tags.swing; |
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17 | ||
18 | import java.awt.BorderLayout; |
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19 | import java.awt.Component; |
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20 | ||
21 | import org.apache.commons.jelly.JellyTagException; |
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22 | import org.apache.commons.jelly.TagSupport; |
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23 | import org.apache.commons.jelly.XMLOutput; |
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24 | ||
25 | /** |
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26 | * Represents a layout of a child component within its parent <borderLayout> layout. |
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27 | * |
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28 | * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> |
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29 | * @version $Revision: 155420 $ |
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30 | */ |
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31 | 0 | public class BorderAlignTag extends TagSupport implements ContainerTag { |
32 | ||
33 | private String align; |
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34 | ||
35 | // ContainerTag interface |
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36 | //------------------------------------------------------------------------- |
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37 | ||
38 | /** |
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39 | * Adds a child component to this parent |
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40 | */ |
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41 | public void addChild(Component component, Object constraints) throws JellyTagException { |
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42 | 0 | BorderLayoutTag tag = (BorderLayoutTag) findAncestorWithClass( BorderLayoutTag.class ); |
43 | 0 | if (tag == null) { |
44 | 0 | throw new JellyTagException( "this tag must be nested within a <borderLayout> tag" ); |
45 | } |
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46 | 0 | tag.addLayoutComponent(component, getConstraints()); |
47 | 0 | } |
48 | ||
49 | // Tag interface |
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50 | //------------------------------------------------------------------------- |
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51 | public void doTag(final XMLOutput output) throws JellyTagException { |
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52 | 0 | invokeBody(output); |
53 | 0 | } |
54 | ||
55 | // Properties |
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56 | //------------------------------------------------------------------------- |
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57 | ||
58 | /** |
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59 | * Returns the align. |
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60 | * @return String |
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61 | */ |
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62 | public String getAlign() { |
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63 | 0 | return align; |
64 | } |
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65 | ||
66 | /** |
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67 | * Sets the alignment of the child component which is a case insensitive value |
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68 | * of {NORTH, SOUTH, EAST, WEST, CENTER} which defaults to CENTER |
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69 | */ |
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70 | public void setAlign(String align) { |
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71 | 0 | this.align = align; |
72 | 0 | } |
73 | ||
74 | // Implementation methods |
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75 | //------------------------------------------------------------------------- |
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76 | ||
77 | protected Object getConstraints() { |
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78 | 0 | if ("north".equalsIgnoreCase(align)) { |
79 | 0 | return BorderLayout.NORTH; |
80 | } |
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81 | 0 | else if ("south".equalsIgnoreCase(align)) { |
82 | 0 | return BorderLayout.SOUTH; |
83 | } |
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84 | 0 | else if ("east".equalsIgnoreCase(align)) { |
85 | 0 | return BorderLayout.EAST; |
86 | } |
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87 | 0 | else if ("west".equalsIgnoreCase(align)) { |
88 | 0 | return BorderLayout.WEST; |
89 | } |
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90 | else { |
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91 | // default to CENTER |
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92 | 0 | return BorderLayout.CENTER; |
93 | } |
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94 | } |
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95 | } |
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96 |
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