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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.tapestry.AbstractComponent; |
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| import org.apache.tapestry.IAsset; |
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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.PageRenderSupport; |
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| import org.apache.tapestry.Tapestry; |
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| import org.apache.tapestry.TapestryUtils; |
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| import org.apache.tapestry.components.ILinkComponent; |
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| import org.apache.tapestry.components.LinkEventType; |
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| public abstract class Rollover extends AbstractComponent |
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| { |
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| protected String getAssetURL(IAsset asset)
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| { |
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| if (asset == null)
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| return null;
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| return asset.buildURL();
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| } |
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| protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
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| { |
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| if (cycle.isRewinding())
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| return;
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| String imageURL = null;
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| String mouseOverURL = null;
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| String mouseOutURL = null;
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| boolean dynamic = false;
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| String imageId = null;
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| PageRenderSupport pageRenderSupport = TapestryUtils.getPageRenderSupport(cycle, this);
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| ILinkComponent serviceLink = (ILinkComponent) cycle
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| .getAttribute(Tapestry.LINK_COMPONENT_ATTRIBUTE_NAME); |
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| if (serviceLink == null)
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| throw new ApplicationRuntimeException(Tapestry
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| .getMessage("Rollover.must-be-contained-by-link"), this, null, 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());
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| if (imageURL == null)
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| imageURL = getAssetURL(getImage());
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| } |
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| else |
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| { |
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| imageURL = getAssetURL(getImage());
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| mouseOverURL = getAssetURL(getMouseOver());
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| mouseOutURL = getAssetURL(getMouseOut());
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| dynamic = (mouseOverURL != null) || (mouseOutURL != 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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| if (dynamic)
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| { |
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| if (mouseOverURL == null)
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| mouseOverURL = imageURL;
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| if (mouseOutURL == null)
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| mouseOutURL = imageURL;
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| imageId = writeScript(cycle, pageRenderSupport, serviceLink, mouseOverURL, mouseOutURL);
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| writer.attribute("id", imageId);
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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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| public abstract IScript getScript(); |
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| private String writeScript(IRequestCycle cycle, PageRenderSupport pageRenderSupport,
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| ILinkComponent link, String mouseOverImageURL, String mouseOutImageURL) |
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| { |
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| String imageId = pageRenderSupport.getUniqueString(getId());
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| String preloadedMouseOverImageURL = pageRenderSupport
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| .getPreloadedImageReference(mouseOverImageURL); |
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| String preloadedMouseOutImageURL = pageRenderSupport
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| .getPreloadedImageReference(mouseOutImageURL); |
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| Map symbols = new HashMap();
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| symbols.put("imageId", imageId);
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| symbols.put("mouseOverImageURL", preloadedMouseOverImageURL);
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| symbols.put("mouseOutImageURL", preloadedMouseOutImageURL);
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| getScript().execute(cycle, pageRenderSupport, symbols);
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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 imageId;
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| } |
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| public abstract IAsset getMouseOut(); |
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| public abstract IAsset getDisabled(); |
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| public abstract IAsset getMouseOver(); |
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| public abstract IAsset getImage(); |
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| } |