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.wml;
016
017import org.apache.tapestry.AbstractComponent;
018import org.apache.tapestry.IMarkupWriter;
019import org.apache.tapestry.IRequestCycle;
020import 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 <option> tags, you must use
026 *  a Select and Option or a concrete class of {@link org.apache.tapestry.link.ILinkRenderer} with the
027 *  {@link OptionRenderer}.
028 *
029 *  @author David Solis
030 */
031
032public 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}