001// Copyright 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.event;
016
017import java.util.EventListener;
018
019/**
020 * Event listener for determining when a page is about to start rendering. Rendering includes the
021 * replay of a form to handle form submissions.
022 * 
023 * @author Howard M. Lewis Ship
024 * @since 4.0
025 */
026public interface PageBeginRenderListener extends EventListener
027{
028    /**
029     * Invoked before just before the page renders a response. This provides listeners with a last
030     * chance to initialize themselves for the render. This initialization can include modifying
031     * peristent page properties.
032     */
033
034    public void pageBeginRender(PageEvent event);
035}