Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
Radio |
|
| 3.3333333333333335;3.333 |
1 | // Copyright 2004, 2005 The Apache Software Foundation |
|
2 | // |
|
3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
|
4 | // you may not use this file except in compliance with the License. |
|
5 | // You may obtain a copy of the License at |
|
6 | // |
|
7 | // http://www.apache.org/licenses/LICENSE-2.0 |
|
8 | // |
|
9 | // Unless required by applicable law or agreed to in writing, software |
|
10 | // distributed under the License is distributed on an "AS IS" BASIS, |
|
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
|
12 | // See the License for the specific language governing permissions and |
|
13 | // limitations under the License. |
|
14 | ||
15 | package org.apache.tapestry.form; |
|
16 | ||
17 | import org.apache.hivemind.ApplicationRuntimeException; |
|
18 | import org.apache.tapestry.AbstractComponent; |
|
19 | import org.apache.tapestry.IMarkupWriter; |
|
20 | import org.apache.tapestry.IRequestCycle; |
|
21 | import org.apache.tapestry.Tapestry; |
|
22 | ||
23 | /** |
|
24 | * Implements a component that manages an HTML <input type=radio> form element. |
|
25 | * Such a component must be wrapped (possibly indirectly) |
|
26 | * inside a {@link RadioGroup} component. |
|
27 | * |
|
28 | * [<a href="../../../../../ComponentReference/Radio.html">Component Reference</a>] |
|
29 | * |
|
30 | * |
|
31 | * <p>{@link Radio} and {@link RadioGroup} are generally not used (except |
|
32 | * for very special cases). Instead, a {@link PropertySelection} component is used. |
|
33 | * |
|
34 | * |
|
35 | * @author Howard Lewis Ship |
|
36 | * |
|
37 | **/ |
|
38 | ||
39 | 0 | public abstract class Radio extends AbstractComponent |
40 | { |
|
41 | /** |
|
42 | * Renders the form element, or responds when the form containing the element |
|
43 | * is submitted (by checking {@link Form#isRewinding()}. |
|
44 | * |
|
45 | * |
|
46 | **/ |
|
47 | ||
48 | protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) |
|
49 | { |
|
50 | ||
51 | 0 | RadioGroup group = RadioGroup.get(cycle); |
52 | ||
53 | 0 | if (group == null) |
54 | 0 | throw new ApplicationRuntimeException( |
55 | Tapestry.getMessage("Radio.must-be-contained-by-group"), |
|
56 | this, |
|
57 | null, |
|
58 | null); |
|
59 | ||
60 | // The group determines rewinding from the form. |
|
61 | ||
62 | 0 | boolean rewinding = group.isRewinding(); |
63 | ||
64 | 0 | int option = group.getNextOptionId(); |
65 | ||
66 | 0 | if (rewinding) |
67 | { |
|
68 | // If not disabled and this is the selected button within the radio group, |
|
69 | // then update set the selection from the group to the value for this |
|
70 | // radio button. This will update the selected parameter of the RadioGroup. |
|
71 | ||
72 | 0 | if (!isDisabled() && !group.isDisabled() && group.isSelected(option)) |
73 | 0 | group.updateSelection(getValue()); |
74 | ||
75 | 0 | return; |
76 | } |
|
77 | ||
78 | 0 | setClientId(group.getName()+option); |
79 | ||
80 | 0 | writer.beginEmpty("input"); |
81 | ||
82 | 0 | writer.attribute("type", "radio"); |
83 | ||
84 | 0 | writer.attribute("name", group.getName()); |
85 | ||
86 | 0 | renderIdAttribute(writer, cycle); |
87 | ||
88 | // As the group if the value for this Radio matches the selection |
|
89 | // for the group as a whole; if so this is the default radio and is checked. |
|
90 | ||
91 | 0 | if (group.isSelection(getValue())) |
92 | 0 | writer.attribute("checked", "checked"); |
93 | ||
94 | 0 | if (isDisabled() || group.isDisabled()) |
95 | 0 | writer.attribute("disabled", "disabled"); |
96 | ||
97 | // The value for the Radio matches the option number (provided by the RadioGroup). |
|
98 | // When the form is submitted, the RadioGroup will know which option was, |
|
99 | // in fact, selected by the user. |
|
100 | ||
101 | 0 | writer.attribute("value", option); |
102 | ||
103 | 0 | renderInformalParameters(writer, cycle); |
104 | ||
105 | 0 | } |
106 | ||
107 | public abstract boolean isDisabled(); |
|
108 | ||
109 | public abstract Object getValue(); |
|
110 | } |