Clover coverage report - Code Coverage for tapestry release 4.0-alpha-3
Coverage timestamp: Mon May 16 2005 09:05:49 EDT
file stats: LOC: 179   Methods: 4
NCLOC: 103   Classes: 1
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 Source file Conditionals Statements Methods TOTAL
Rollover.java 0% 0% 0% 0%
coverage
 1   
 // Copyright 2004, 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.html;
 16   
 
 17   
 import java.util.HashMap;
 18   
 import java.util.Map;
 19   
 
 20   
 import org.apache.hivemind.ApplicationRuntimeException;
 21   
 import org.apache.hivemind.Resource;
 22   
 import org.apache.tapestry.AbstractComponent;
 23   
 import org.apache.tapestry.IAsset;
 24   
 import org.apache.tapestry.IEngine;
 25   
 import org.apache.tapestry.IMarkupWriter;
 26   
 import org.apache.tapestry.IRequestCycle;
 27   
 import org.apache.tapestry.IScript;
 28   
 import org.apache.tapestry.PageRenderSupport;
 29   
 import org.apache.tapestry.Tapestry;
 30   
 import org.apache.tapestry.TapestryUtils;
 31   
 import org.apache.tapestry.components.ILinkComponent;
 32   
 import org.apache.tapestry.components.LinkEventType;
 33   
 import org.apache.tapestry.engine.IScriptSource;
 34   
 
 35   
 /**
 36   
  * Combines a link component (such as {@link org.apache.tapestry.link.DirectLink}) with an
 37   
  * <img> and JavaScript code to create a rollover effect that works with both Netscape
 38   
  * Navigator and Internet Explorer. [ <a
 39   
  * href="../../../../../ComponentReference/Rollover.html">Component Reference </a>]
 40   
  * 
 41   
  * @author Howard Lewis Ship
 42   
  */
 43   
 
 44   
 public abstract class Rollover extends AbstractComponent
 45   
 {
 46   
     private IScript _parsedScript;
 47   
 
 48   
     /**
 49   
      * Converts an {@link IAsset}binding into a usable URL. Returns null if the binding does not
 50   
      * exist or the binding's value is null.
 51   
      */
 52   
 
 53  0
     protected String getAssetURL(IAsset asset, IRequestCycle cycle)
 54   
     {
 55  0
         if (asset == null)
 56  0
             return null;
 57   
 
 58  0
         return asset.buildURL(cycle);
 59   
     }
 60   
 
 61  0
     protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
 62   
     {
 63   
         // No body, so we skip it all if not rewinding (assumes no side effects on
 64   
         // accessors).
 65   
 
 66  0
         if (cycle.isRewinding())
 67  0
             return;
 68   
 
 69  0
         String imageURL = null;
 70  0
         String focusURL = null;
 71  0
         String blurURL = null;
 72  0
         boolean dynamic = false;
 73  0
         String imageName = null;
 74   
 
 75  0
         PageRenderSupport pageRenderSupport = TapestryUtils.getPageRenderSupport(cycle, this);
 76   
 
 77  0
         ILinkComponent serviceLink = (ILinkComponent) cycle
 78   
                 .getAttribute(Tapestry.LINK_COMPONENT_ATTRIBUTE_NAME);
 79   
 
 80  0
         if (serviceLink == null)
 81  0
             throw new ApplicationRuntimeException(Tapestry
 82   
                     .getMessage("Rollover.must-be-contained-by-link"), this, null, null);
 83   
 
 84  0
         boolean linkDisabled = serviceLink.isDisabled();
 85   
 
 86  0
         if (linkDisabled)
 87   
         {
 88  0
             imageURL = getAssetURL(getDisabled(), cycle);
 89   
 
 90  0
             if (imageURL == null)
 91  0
                 imageURL = getAssetURL(getImage(), cycle);
 92   
         }
 93   
         else
 94   
         {
 95  0
             imageURL = getAssetURL(getImage(), cycle);
 96  0
             focusURL = getAssetURL(getFocus(), cycle);
 97  0
             blurURL = getAssetURL(getBlur(), cycle);
 98   
 
 99  0
             dynamic = (focusURL != null) || (blurURL != null);
 100   
         }
 101   
 
 102  0
         if (imageURL == null)
 103  0
             throw Tapestry.createRequiredParameterException(this, "image");
 104   
 
 105  0
         writer.beginEmpty("img");
 106   
 
 107  0
         writer.attribute("src", imageURL);
 108   
 
 109  0
         writer.attribute("border", 0);
 110   
 
 111  0
         if (dynamic)
 112   
         {
 113  0
             if (focusURL == null)
 114  0
                 focusURL = imageURL;
 115   
 
 116  0
             if (blurURL == null)
 117  0
                 blurURL = imageURL;
 118   
 
 119  0
             imageName = writeScript(cycle, pageRenderSupport, serviceLink, focusURL, blurURL);
 120   
 
 121  0
             writer.attribute("name", imageName);
 122   
         }
 123   
 
 124  0
         renderInformalParameters(writer, cycle);
 125   
 
 126  0
         writer.closeTag();
 127   
 
 128   
     }
 129   
 
 130  0
     private IScript getParsedScript()
 131   
     {
 132  0
         if (_parsedScript == null)
 133   
         {
 134  0
             IEngine engine = getPage().getEngine();
 135  0
             IScriptSource source = engine.getScriptSource();
 136   
 
 137  0
             Resource scriptLocation = getSpecification().getSpecificationLocation()
 138   
                     .getRelativeResource("Rollover.script");
 139   
 
 140  0
             _parsedScript = source.getScript(scriptLocation);
 141   
         }
 142   
 
 143  0
         return _parsedScript;
 144   
     }
 145   
 
 146  0
     private String writeScript(IRequestCycle cycle, PageRenderSupport pageRenderSupport,
 147   
             ILinkComponent link, String focusURL, String blurURL)
 148   
     {
 149  0
         String imageName = pageRenderSupport.getUniqueString(getId());
 150  0
         String focusImageURL = pageRenderSupport.getPreloadedImageReference(focusURL);
 151  0
         String blurImageURL = pageRenderSupport.getPreloadedImageReference(blurURL);
 152   
 
 153  0
         Map symbols = new HashMap();
 154   
 
 155  0
         symbols.put("imageName", imageName);
 156  0
         symbols.put("focusImageURL", focusImageURL);
 157  0
         symbols.put("blurImageURL", blurImageURL);
 158   
 
 159  0
         getParsedScript().execute(cycle, pageRenderSupport, symbols);
 160   
 
 161   
         // Add attributes to the link to control mouse over/out.
 162   
         // Because the script is written before the <body> tag,
 163   
         // there won't be any timing issues (such as cause
 164   
         // bug #113893).
 165   
 
 166  0
         link.addEventHandler(LinkEventType.MOUSE_OVER, (String) symbols.get("onMouseOverName"));
 167  0
         link.addEventHandler(LinkEventType.MOUSE_OUT, (String) symbols.get("onMouseOutName"));
 168   
 
 169  0
         return imageName;
 170   
     }
 171   
 
 172   
     public abstract IAsset getBlur();
 173   
 
 174   
     public abstract IAsset getDisabled();
 175   
 
 176   
     public abstract IAsset getFocus();
 177   
 
 178   
     public abstract IAsset getImage();
 179   
 }