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Java > Open Source Codes > org > apache > tapestry > wml > PropertySelection


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.wml;
16
17 import org.apache.tapestry.AbstractComponent;
18 import org.apache.tapestry.IMarkupWriter;
19 import org.apache.tapestry.IRequestCycle;
20 import org.apache.tapestry.form.IPropertySelectionModel;
21
22 /**
23  * A high level component used to render a drop-down list of options that the user may select.
24  *
25  * Informal parameters are applied to the <select> tag. To have greater control over the <option> tags, you must use
26  * a Select and Option or a concrete class of {@link org.apache.tapestry.link.ILinkRenderer} with the
27  * {@link OptionRenderer}.
28  *
29  * @author David Solis
30  */
31
32 public abstract class PropertySelection extends AbstractComponent
33 {
34     /**
35      * @see AbstractComponent#renderComponent(IMarkupWriter, IRequestCycle)
36      **/
37
38     protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
39     {
40         boolean render = !cycle.isRewinding();
41
42         if (render)
43         {
44             IPropertySelectionModel model = getModel();
45
46             writer.begin("select");
47
48             writer.attribute("name", getName());
49
50             renderInformalParameters(writer, cycle);
51
52             writer.println();
53
54             int count = model.getOptionCount();
55
56             for (int i = 0; i < count; i++)
57             {
58
59                 writer.begin("option");
60                 writer.attribute("value", model.getValue(i));
61
62                 writer.print(model.getLabel(i));
63
64                 writer.end();
65                 writer.println();
66             }
67
68             writer.end();
69         }
70     }
71
72     public abstract IPropertySelectionModel getModel();
73
74     public abstract String JavaDoc getName();
75 }
76
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