| // Copyright 2009 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.tapestry5.corelib.mixins; |
| |
| import org.apache.tapestry5.MarkupWriter; |
| import org.apache.tapestry5.annotations.MixinAfter; |
| import org.apache.tapestry5.dom.Element; |
| |
| /** |
| * A mixin that attaches to an element that renders an element. At the end of the render, if the element is empty, then |
| * a non-breaking space ( ) is injected into the element. This is often necessary for proper rendering on the |
| * client. |
| * <p/> |
| * Often used in conjunction with the {@link org.apache.tapestry5.corelib.components.Any} component. |
| * |
| * @since 5.1.0.0 |
| */ |
| @MixinAfter |
| public class NotEmpty |
| { |
| private Element element; |
| |
| void beginRender(MarkupWriter writer) |
| { |
| element = writer.getElement(); |
| } |
| |
| void afterRender() |
| { |
| if (element.isEmpty()) |
| { |
| element.removeChildren(); |
| element.raw(" "); |
| } |
| } |
| } |