framework/src/org/apache/tapestry/form/RadioPropertySelectionRenderer.java

//  Copyright 2004 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package org.apache.tapestry.form;

import org.apache.tapestry.IMarkupWriter;
import org.apache.tapestry.IRequestCycle;

/**
 *  Implementation of {@link IPropertySelectionRenderer} that
 *  produces a table of radio (<input type=radio>) elements.
 *
 *  @version $Id$
 *  @author Howard Lewis Ship
 *
 **/

public class RadioPropertySelectionRenderer implements IPropertySelectionRenderer
{

    /**
     *  Writes the <table> element.
     *
     **/

    public void beginRender(PropertySelection component, IMarkupWriter writer, IRequestCycle cycle)
    {
        writer.begin("table");
        writer.attribute("border", 0);
        writer.attribute("cellpadding", 0);
        writer.attribute("cellspacing", 2);
    }

    /**
     *  Closes the <table> element.
     *
     **/

    public void endRender(PropertySelection component, IMarkupWriter writer, IRequestCycle cycle)
    {
        writer.end(); // <table>
    }

    /**
     *  Writes a row of the table.  The table contains two cells; the first is the radio
     *  button, the second is the label for the radio button.
     *
     **/

    public void renderOption(
        PropertySelection component,
        IMarkupWriter writer,
        IRequestCycle cycle,
        IPropertySelectionModel model,
        Object option,
        int index,
        boolean selected)
    {
        writer.begin("tr");
        writer.begin("td");

        writer.beginEmpty("input");
        writer.attribute("type", "radio");
        writer.attribute("name", component.getName());
        writer.attribute("value", model.getValue(index));

        if (component.isDisabled())
            writer.attribute("disabled", "disabled");

        if (selected)
            writer.attribute("checked", "checked");

        writer.end(); // <td>

        writer.println();

        writer.begin("td");
        writer.print(model.getLabel(index));
        writer.end(); // <td>
        writer.end(); // <tr>	

        writer.println();
    }
}