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.wml;
016    
017    import org.apache.tapestry.AbstractComponent;
018    import org.apache.tapestry.IMarkupWriter;
019    import org.apache.tapestry.IRequestCycle;
020    import org.apache.tapestry.form.IPropertySelectionModel;
021    
022    /**
023     *  A high level component used to render a drop-down list of options that the user may select.
024     *
025     *  Informal parameters are applied to the <select> tag.  To have greater control over the 
026     *  <option> tags, you must use a Select and Option or a concrete class 
027     *  of {@link org.apache.tapestry.link.ILinkRenderer} with the {@link OptionRenderer}.
028     *
029     *  @author David Solis
030     */
031    
032    public abstract class PropertySelection extends AbstractComponent
033    {
034        /**
035         *  @see AbstractComponent#renderComponent(IMarkupWriter, IRequestCycle)
036         **/
037    
038        protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
039        {
040            boolean render = !cycle.isRewinding();
041    
042            if (render)
043            {
044                IPropertySelectionModel model = getModel();
045    
046                writer.begin("select");
047    
048                writer.attribute("name", getName());
049    
050                renderInformalParameters(writer, cycle);
051    
052                writer.println();
053    
054                int count = model.getOptionCount();
055    
056                for (int i = 0; i < count; i++)
057                {
058    
059                    writer.begin("option");
060                    writer.attribute("value", model.getValue(i));
061    
062                    writer.print(model.getLabel(i));
063    
064                    writer.end();
065                    writer.println();
066                }
067    
068                writer.end();
069            }
070        }
071    
072        public abstract IPropertySelectionModel getModel();
073    
074        public abstract String getName();
075    }