PageRenderSupport


1   // Copyright 2005 The Apache Software Foundation
2   //
3   // Licensed under the Apache License, Version 2.0 (the "License");
4   // you may not use this file except in compliance with the License.
5   // You may obtain a copy of the License at
6   //
7   //     http://www.apache.org/licenses/LICENSE-2.0
8   //
9   // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  package org.apache.tapestry;
16  
17  /**
18   * Extends {@link org.apache.tapestry.IScriptProcessor}&nbsp;with a handful of additional methods
19   * needed when rendering a page response.
20   * 
21   * @author Howard M. Lewis Ship
22   * @since 4.0
23   * @see org.apache.tapestry.html.Body
24   * @see org.apache.tapestry.TapestryUtils#getPageRenderSupport(IRequestCycle, Object)
25   */
26  public interface PageRenderSupport extends IScriptProcessor
27  {
28      /**
29       * Sets up the given URL to preload, and returns a reference to the loaded image, in the form of
30       * a snippet of JavaScript expression that can be inserted into some larger block of JavaScript
31       * as a function parameter, or as a property assignment. A typical return value might be
32       * <code>tapestry_preload[7].src</code>.
33       */
34  
35      public String   getPreloadedImageReference(String   url);
36  }

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