001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry.form;
016    
017    import org.apache.tapestry.IMarkupWriter;
018    import org.apache.tapestry.IRequestCycle;
019    
020    /**
021     *  Implementation of {@link IPropertySelectionRenderer} that
022     *  produces a table of radio (<input type=radio>) elements.
023     *
024     *  @author Howard Lewis Ship
025     *
026     **/
027    
028    public class RadioPropertySelectionRenderer implements IPropertySelectionRenderer
029    {
030    
031        /**
032         *  Writes the <table> element.
033         *
034         **/
035    
036        public void beginRender(PropertySelection component, IMarkupWriter writer, IRequestCycle cycle)
037        {
038            writer.begin("table");
039            writer.attribute("border", 0);
040            writer.attribute("cellpadding", 0);
041            writer.attribute("cellspacing", 2);
042        }
043    
044        /**
045         *  Closes the <table> element.
046         *
047         **/
048    
049        public void endRender(PropertySelection component, IMarkupWriter writer, IRequestCycle cycle)
050        {
051            writer.end(); // <table>
052        }
053    
054        /**
055         *  Writes a row of the table.  The table contains two cells; the first is the radio
056         *  button, the second is the label for the radio button.
057         *
058         **/
059    
060        public void renderOption(
061            PropertySelection component,
062            IMarkupWriter writer,
063            IRequestCycle cycle,
064            IPropertySelectionModel model,
065            Object option,
066            int index,
067            boolean selected)
068        {
069            writer.begin("tr");
070            writer.begin("td");
071    
072            writer.beginEmpty("input");
073            writer.attribute("type", "radio");
074            writer.attribute("name", component.getName());
075            writer.attribute("value", model.getValue(index));
076    
077            if (component.isDisabled())
078                writer.attribute("disabled", "disabled");
079    
080            if (selected)
081                writer.attribute("checked", "checked");
082    
083            writer.end(); // <td>
084    
085            writer.println();
086    
087            writer.begin("td");
088            writer.print(model.getLabel(index));
089            writer.end(); // <td>
090            writer.end(); // <tr>
091    
092            writer.println();
093        }
094    }