| // Copyright 2004, 2005 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.wml; |
| |
| import org.apache.hivemind.ApplicationRuntimeException; |
| import org.apache.hivemind.HiveMind; |
| import org.apache.tapestry.AbstractComponent; |
| import org.apache.tapestry.IMarkupWriter; |
| import org.apache.tapestry.IRequestCycle; |
| import org.apache.tapestry.Tapestry; |
| |
| /** |
| * The Select element lets users pick from a list of options. Each option is specified by an Option |
| * element. Each Option element may have one line of formatted text (which may be wrapped or |
| * truncated by the user agent if too long). Unless multiple selections are required it is generally |
| * easier to use the {@link PropertySelection}component. |
| * |
| * @author David Solis |
| * @since 3.0 |
| */ |
| public abstract class Select extends AbstractComponent |
| { |
| /** |
| * Used by the <code>Select</code> to record itself as a {@link IRequestCycle}attribute, so |
| * that the {@link Option}components it wraps can have access to it. |
| */ |
| |
| private static final String ATTRIBUTE_NAME = "org.apache.tapestry.active.Select"; |
| |
| /** |
| * @see org.apache.tapestry.AbstractComponent#renderComponent(IMarkupWriter, IRequestCycle) |
| */ |
| |
| protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) |
| { |
| if (cycle.getAttribute(ATTRIBUTE_NAME) != null) |
| throw new ApplicationRuntimeException(Tapestry.getMessage("Select.may-not-nest"), this, |
| null, null); |
| |
| cycle.setAttribute(ATTRIBUTE_NAME, this); |
| |
| boolean render = !cycle.isRewinding(); |
| |
| if (render) |
| { |
| writer.begin("select"); |
| |
| writer.attribute("name", getName()); |
| |
| String value = getValue(); |
| if (HiveMind.isNonBlank(value)) |
| writer.attribute("value", value); |
| |
| String title = getTitle(); |
| if (HiveMind.isNonBlank(title)) |
| writer.attribute("title", title); |
| |
| boolean multiple = isMultiple(); |
| if (multiple) |
| writer.attribute("multiple", multiple); |
| |
| renderInformalParameters(writer, cycle); |
| } |
| |
| renderBody(writer, cycle); |
| |
| if (render) |
| { |
| writer.end(); |
| } |
| |
| cycle.removeAttribute(ATTRIBUTE_NAME); |
| } |
| |
| public abstract boolean isMultiple(); |
| |
| public abstract String getName(); |
| |
| public abstract String getValue(); |
| |
| public abstract String getTitle(); |
| } |