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Java > Open Source Codes > org > apache > tapestry > contrib > form > CheckBoxMultiplePropertySelectionRenderer


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.contrib.form;
16
17 import org.apache.tapestry.IMarkupWriter;
18 import org.apache.tapestry.IRequestCycle;
19 import org.apache.tapestry.form.IPropertySelectionModel;
20
21 /**
22  * Implementation of {@link IMultiplePropertySelectionRenderer} that
23  * produces a table of checkbox (<input type=checkbox>) elements.
24  *
25  * @author Sanjay Munjal
26  *
27  */
28
29 public class CheckBoxMultiplePropertySelectionRenderer
30     implements IMultiplePropertySelectionRenderer
31 {
32
33     /**
34      * Writes the <table> element.
35      *
36      **/
37
38     public void beginRender(
39         MultiplePropertySelection component,
40         IMarkupWriter writer,
41         IRequestCycle cycle)
42     {
43         writer.begin("table");
44         writer.attribute("border", 0);
45         writer.attribute("cellpadding", 0);
46         writer.attribute("cellspacing", 2);
47     }
48
49     /**
50      * Closes the <table> element.
51      *
52      **/
53
54     public void endRender(
55         MultiplePropertySelection component,
56         IMarkupWriter writer,
57         IRequestCycle cycle)
58     {
59         writer.end(); // <table>
60 }
61
62     /**
63      * Writes a row of the table. The table contains two cells; the first is the checkbox,
64      * the second is the label for the checkbox.
65      *
66      **/
67
68     public void renderOption(
69         MultiplePropertySelection component,
70         IMarkupWriter writer,
71         IRequestCycle cycle,
72         IPropertySelectionModel model,
73         Object JavaDoc option,
74         int index,
75         boolean selected)
76     {
77         writer.begin("tr");
78         writer.begin("td");
79
80         writer.beginEmpty("input");
81         writer.attribute("type", "checkbox");
82         writer.attribute("name", component.getName());
83         writer.attribute("value", model.getValue(index));
84
85         if (component.isDisabled())
86             writer.attribute("disabled", "disabled");
87
88         if (selected)
89             writer.attribute("checked", "checked");
90
91         writer.end(); // <td>
92
93         writer.println();
94
95         writer.begin("td");
96         writer.print(model.getLabel(index));
97         writer.end(); // <td>
98 writer.end(); // <tr>
99
100         writer.println();
101     }
102 }
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