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30 day Evaluation Version distributed via the Maven Jar Repository. Clover is not free. You have 30 days to evaluate it. Please visit http://www.thecortex.net/clover to obtain a licensed version of Clover | |||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
Rollover.java | 0% | 0% | 0% | 0% |
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// Copyright 2004, 2005 The Apache Software Foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package org.apache.tapestry.html;
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import java.util.HashMap;
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import java.util.Map;
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import org.apache.hivemind.ApplicationRuntimeException;
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import org.apache.hivemind.Resource;
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import org.apache.tapestry.AbstractComponent;
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import org.apache.tapestry.IAsset;
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import org.apache.tapestry.IEngine;
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import org.apache.tapestry.IMarkupWriter;
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import org.apache.tapestry.IRequestCycle;
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import org.apache.tapestry.IScript;
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import org.apache.tapestry.Tapestry;
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import org.apache.tapestry.components.ILinkComponent;
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import org.apache.tapestry.components.LinkEventType;
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import org.apache.tapestry.engine.IScriptSource;
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/**
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* Combines a link component (such as {@link org.apache.tapestry.link.DirectLink})
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* with an <img> and JavaScript code
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* to create a rollover effect that works with both Netscape Navigator and
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* Internet Explorer.
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*
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* [<a href="../../../../../ComponentReference/Rollover.html">Component Reference</a>]
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*
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*
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* @author Howard Lewis Ship
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*
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**/
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public abstract class Rollover extends AbstractComponent |
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{ |
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private IScript _parsedScript;
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/**
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* Converts an {@link IAsset} binding into a usable URL. Returns null
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* if the binding does not exist or the binding's value is null.
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*
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**/
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protected String getAssetURL(IAsset asset, IRequestCycle cycle)
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{ |
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if (asset == null) |
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return null; |
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return asset.buildURL(cycle);
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} |
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protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) |
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{ |
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// No body, so we skip it all if not rewinding (assumes no side effects on
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// accessors).
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if (cycle.isRewinding())
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return;
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String imageURL = null;
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String focusURL = null;
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String blurURL = null;
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boolean dynamic = false; |
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String imageName = null;
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Body body = Body.get(cycle); |
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if (body == null) |
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throw new ApplicationRuntimeException( |
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Tapestry.getMessage("Rollover.must-be-contained-by-body"),
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this,
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null,
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null);
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ILinkComponent serviceLink = |
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(ILinkComponent) cycle.getAttribute(Tapestry.LINK_COMPONENT_ATTRIBUTE_NAME); |
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if (serviceLink == null) |
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throw new ApplicationRuntimeException( |
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Tapestry.getMessage("Rollover.must-be-contained-by-link"),
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this,
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null,
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null);
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boolean linkDisabled = serviceLink.isDisabled();
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if (linkDisabled)
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{ |
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imageURL = getAssetURL(getDisabled(), cycle); |
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if (imageURL == null) |
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imageURL = getAssetURL(getImage(), cycle); |
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} |
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else
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{ |
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imageURL = getAssetURL(getImage(), cycle); |
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focusURL = getAssetURL(getFocus(), cycle); |
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blurURL = getAssetURL(getBlur(), cycle); |
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dynamic = (focusURL != null) || (blurURL != null); |
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} |
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if (imageURL == null) |
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throw Tapestry.createRequiredParameterException(this, "image"); |
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writer.beginEmpty("img");
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writer.attribute("src", imageURL);
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writer.attribute("border", 0);
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if (dynamic)
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{ |
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if (focusURL == null) |
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focusURL = imageURL; |
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if (blurURL == null) |
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blurURL = imageURL; |
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imageName = writeScript(cycle, body, serviceLink, focusURL, blurURL); |
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writer.attribute("name", imageName);
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} |
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renderInformalParameters(writer, cycle); |
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writer.closeTag(); |
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} |
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private IScript getParsedScript()
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{ |
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if (_parsedScript == null) |
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{ |
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IEngine engine = getPage().getEngine(); |
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IScriptSource source = engine.getScriptSource(); |
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Resource scriptLocation = |
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getSpecification().getSpecificationLocation().getRelativeResource( |
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"Rollover.script");
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_parsedScript = source.getScript(scriptLocation); |
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} |
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return _parsedScript;
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} |
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private String writeScript(
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IRequestCycle cycle, |
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Body body, |
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ILinkComponent link, |
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String focusURL, |
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String blurURL) |
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{ |
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String imageName = body.getUniqueString(getId()); |
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String focusImageURL = body.getPreloadedImageReference(focusURL); |
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String blurImageURL = body.getPreloadedImageReference(blurURL); |
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Map symbols = new HashMap();
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symbols.put("imageName", imageName);
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symbols.put("focusImageURL", focusImageURL);
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symbols.put("blurImageURL", blurImageURL);
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getParsedScript().execute(cycle, body, symbols); |
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// Add attributes to the link to control mouse over/out.
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// Because the script is written before the <body> tag,
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// there won't be any timing issues (such as cause
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// bug #113893).
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link.addEventHandler(LinkEventType.MOUSE_OVER, (String) symbols.get("onMouseOverName"));
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link.addEventHandler(LinkEventType.MOUSE_OUT, (String) symbols.get("onMouseOutName"));
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return imageName;
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} |
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public abstract IAsset getBlur();
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public abstract IAsset getDisabled();
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public abstract IAsset getFocus();
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public abstract IAsset getImage();
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} |
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