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
015package org.apache.tapestry.form;
016
017import org.apache.tapestry.IMarkupWriter;
018import org.apache.tapestry.IRequestCycle;
019
020/**
021 *  Implementation of {@link IPropertySelectionRenderer} that
022 *  produces a <select> element (containing <option> elements).
023 *
024 *  @author Howard Lewis Ship
025 *
026 **/
027
028public class SelectPropertySelectionRenderer
029    implements IPropertySelectionRenderer
030{
031    /**
032     *  Writes the <select> element.  If the
033     *  {@link PropertySelection} is {@link PropertySelection#isDisabled() disabled}
034     *  then a <code>disabled</code> attribute is written into the tag
035     *  (though Navigator 4 will ignore this).
036     *
037     **/
038
039    public void beginRender(
040        PropertySelection component,
041        IMarkupWriter writer,
042        IRequestCycle cycle)
043    {
044        writer.begin("select");
045        writer.attribute("name", component.getName());
046
047        if (component.isDisabled())
048            writer.attribute("disabled", "disabled");
049
050        writer.println();
051    }
052
053    /**
054     *  Closes the &lt;select&gt; element.
055     *
056     **/
057
058    public void endRender(
059        PropertySelection component,
060        IMarkupWriter writer,
061        IRequestCycle cycle)
062    {
063        writer.end(); // <select>
064    }
065
066    /**
067     *  Writes an &lt;option&gt; element.
068     *
069     **/
070
071    public void renderOption(
072        PropertySelection component,
073        IMarkupWriter writer,
074        IRequestCycle cycle,
075        IPropertySelectionModel model,
076        Object option,
077        int index,
078        boolean selected)
079    {
080        writer.beginEmpty("option");
081        writer.attribute("value", model.getValue(index));
082
083        if (selected)
084            writer.attribute("selected", "selected");
085
086        writer.print(model.getLabel(index));
087
088        writer.end();
089        
090        writer.println();
091    }
092}