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We need a component for loading SWF objects (this is not specific to Open Flash Charts, it can be used for any swf object).
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package com.mycompany.ofc2; import java.util.Collections; import java.util.Map; import java.util.HashMap; import org.apache.wicket.Component; import org.apache.wicket.behavior.AbstractBehavior; import org.apache.wicket.markup.ComponentTag; import org.apache.wicket.markup.html.IHeaderContributor; import org.apache.wicket.markup.html.IHeaderResponse; import org.apache.wicket.markup.html.resources.CompressedResourceReference; /** * */ public class SWFObject extends AbstractBehavior implements IHeaderContributor { private static final CompressedResourceReference SWFOBJECT_JS = new CompressedResourceReference(SWFObject.class, "swfobject-2.1.js"); private static final long serialVersionUID = 1L; private Map<String, String> parameters = new HashMap<String, String>(); private Map<String, String> attributes = new HashMap<String, String>(); private String version; private String flashUrl; private String width; private String height; private Component component; @Override public void bind(Component component) { this.component = component; component.setOutputMarkupId(true); } public void renderHead(IHeaderResponse response) { response.renderJavascriptReference(SWFOBJECT_JS); final String id = component.getMarkupId(); String parObj = buildDataObject(getParameters()); String attObj = buildDataObject(getVariablesgetAttributes()); // embedSWF: function(swfUrlStr, replaceElemIdStr, widthStr, heightStr, swfVersionStr, xiSwfUrlStr, flashvarsObj, parObj, attObj) String js = String.format("swfobject.embedSWF('%s','%s', '%s', '%s', '%s', '%s', %s, %s );", flashUrl, id, width, height, version, "expressInstall.swf", parObj, attObj); response.renderJavascript(js, null); } /** * Construct. * <p/> * version can be a string in the format of 'majorVersion.minorVersion.revision'. * An example would be: "6.0.65". Or you can just require the major version, such as "6". * * @param flashUrl The url of your swf file. * @param width width of swf * @param height height of movie * @param version Flash version to support */ public SWFObject(final String flashUrl, final int width, final int height, final String version) { this(flashUrl, String.valueOf(width), String.valueOf(height), version); } /** * Construct. * @param flashUrl URL to load up for swf * @param width width of swf * @param height height of movie * @param version Flash version to support */ public SWFObject(final String flashUrl, final String width, final String height, final String version) { if (flashUrl == null) { throw new IllegalArgumentException("Argument [flashUrl] cannot be null"); } this.flashUrl = flashUrl; this.width = width; this.height = height; this.version = version; } private String buildDataObject(Map<String,String> data) { final String quote = "'"; if (data != null && !data.isEmpty()) { StringBuilder result = new StringBuilder(); result.append("{"); for (Map.Entry<String, String> e : getParameters().entrySet()) { result.append(quote).append(e.getKey()).append(quote + ":" + quote).append(e.getValue()).append(quote); } result.append("}"); return result.toString(); } return "{}"; } @Override public void onComponentTag(final Component component, final ComponentTag tag) { } protected Map<String, String> getParameters() { return parameters; } protected Map<Stringpublic void addParameter(String name, String>String getVariables(value) { return Collections.emptyMap()parameters.put(name, value); } protected Map<String, String> getAttributes() { return attributes; } public void addParameteraddAttribute(String name, String value) { parametersattributes.put(name, value); } } |
Make sure that the referenced javascript file swfobject-2.1.js is on the classpath.
When you use maven, you can put the file in src/main/resources/com/mycompany/ofc2/swfobject-2.1.js
Now the OpenFlashChart component itself:
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package com.mycompany.ofc2; import org.apache.wicket.IResourceListener; import org.apache.wicket.RequestCycle; import org.apache.wicket.ResourceReference; import org.apache.wicket.markup.html.WebResource; import org.apache.wicket.markup.html.panel.Panel; import org.apache.wicket.model.IModel; import org.apache.wicket.model.Model; import org.apache.wicket.protocol.http.RequestUtils; import org.apache.wicket.util.resource.AbstractStringResourceStream; import org.apache.wicket.util.resource.IResourceStream; import ofc4j.model.Chart; /** * Panel for showing a Flash Chart */ public class OpenFlashChart extends Panel implements IResourceListener { static final ResourceReference SWF_RESOURCE = new ResourceReference(OpenFlashChart.class, "open-flash-chart.swf" ); final WebResource jsonResource; final SWFObject swf; public OpenFlashChart(String id, final String width, final String height, final Chart chart) { this(id, width, height, new Model<String>(chart.toString())); } public OpenFlashChart(String id, final int width, final int height, final Chart chart) { this(id, String.valueOf(width), String.valueOf(height), new Model<String>(chart.toString())); } public OpenFlashChart(String id, final int width, final int height, IModel<String> jsonModel) { this(id, String.valueOf(width), String.valueOf(height), jsonModel); } public OpenFlashChart(String id, final String width, final String height, final IModel<String> jsonModel) { super(id); final IResourceStream json = new AbstractStringResourceStream("text/plain") { @Override public String getString() { return jsonModel.getObject(); } }; jsonResource = new WebResource() { @Override public IResourceStream getResourceStream() { return json; } }; jsonResource.setCacheable(false); String swfURL = RequestUtils.toAbsolutePath( urlFor(SWF_RESOURCE).toString() ); add(swf = new SWFObject( swfURL, width, height, "9.0.0")); } private String getUrlForJson() { CharSequence dataPath = RequestCycle.get().urlFor(OpenFlashChart.this, IResourceListener.INTERFACE); return RequestUtils.toAbsolutePath( dataPath.toString() ); } @Override protected void onBeforeRender() { swf.addParameter("data-file", getUrlForJson()); super.onBeforeRender(); } /** * Actually handle the request */ public void onResourceRequested() { jsonResource.onResourceRequested(); } } |
Make sure to have open-flash-chart.swf on your classpath.
You can put it in src/main/resources/com/mycompany/ofc2/open-flash-chart.swf
The accompanying html is rather short
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<wicket:panel>
</wicket:panel>
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Using the component is easy. You need to generate the json that defines your chart.
- You can generate it yourself, and pass the json to the OpenFlashChart constructor that takes an Model<String>
- or you can use http://code.google.com/p/ofcj/ and use the constructor that takes an ofc4j.model.Chart
Example:
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package com.mycompany;
import org.apache.wicket.model.Model;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.WebPage;
import com.mycompany.ofc2.OpenFlashChart;
import ofc4j.model.elements.BarChart;
import ofc4j.model.Chart;
/**
* Homepage
*/
public class HomePage extends WebPage {
private static final long serialVersionUID = 1L;
public HomePage() {
add(new Label("message", "If you see this message wicket is properly configured and running"));
// a) json hard-coded
String json = "{\"elements\":[{\"type\":\"bar\",\"values\":[1,2,3,4,5,6,7,8,9]}],\"title\":{\"text\":\"Tue Oct 14 2008\"}}";
add(new OpenFlashChart("chart1", 200, 300, new Model<String>(json)));
// b) use http://code.google.com/p/ofcj/
BarChart bar1 = new BarChart(BarChart.Style.GLASS);
bar1.setColour("#007FFF");
bar1.setTooltip("Beers:<br>Value:#val#");
bar1.addValues(1,5,8,3,0,2);
bar1.setText("Beers consumed");
bar1.setAlpha(0.1f);
BarChart bar2 = new BarChart(BarChart.Style.GLASS);
bar2.setColour("#802A2A");
bar2.setTooltip("#val#<br>bugs fixed");
bar2.setText("bugs fixed");
bar2.setFontSize(15);
bar1.setAlpha(0.9f);
bar2.addValues(2,7,1,5,8,3,0,2);
Chart chart2 = new Chart("Beers and bugs");
chart2.addElements(bar1,bar2);
chart2.setBackgroundColour("#FFFFFF");
add(new OpenFlashChart("chart2", 300,400,chart2));
}
}
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Accompanying html:
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<html xmlns="http://www.w3.org/1999/xhtml" xmlns:wicket="http://wicket.apache.org/" lang="en">
<head>
<title>Wicket Open Flash Chart Demo</title>
</head>
<body>
<strong>Open Flash Chart Demo</strong>
<br/><br/>
<div wicket:id="message">message will be here</div>
<div wicket:id="chart1" >chart will be here</div>
<div wicket:id="chart2" >chart will be here</div>
</body>
</html>
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TODO: compare my version with the one by Ryan McKinley. I think it's pretty much the same.
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/** * @see <a href="http://code.google.com/p/swfobject/">SWFObject</a> */ public class OpenFlashChart extends Panel implements IResourceListener { static final ResourceReference SWF = new ResourceReference( OpenFlashChart.class, "open-flash-chart.swf" ); final WebResource jsonResource; final SWFObject swf; final IModel<Chart> chart; public OpenFlashChart(final String id, final IModel<Chart> chart, final int width, final int height) { this( id, chart, width+"", height+"" ); } public OpenFlashChart(final String id, final IModel<Chart> chart, final String width, final String height) { super(id); this.chart = chart; final IResourceStream json = new AbstractStringResourceStream( "text/plain") { @Override public String getString() { return chart.getObject().toString(); } }; jsonResource = new WebResource() { @Override public IResourceStream getResourceStream() { return json; } }; jsonResource.setCacheable(false); String swfURL = RequestUtils.toAbsolutePath( urlFor( SWF ).toString() ); swf = new SWFObject( "chart", swfURL, "500", "300" ); add( swf ); } @Override protected void onBeforeRender() { CharSequence dataPath = RequestCycle.get().urlFor(OpenFlashChart.this, IResourceListener.INTERFACE); String data = RequestUtils.toAbsolutePath( dataPath.toString() ); swf.setFlashvar( "data-file", data ); swf.setParam( "allowScriptAccess", "sameDomain" ); super.onBeforeRender(); } /** * Actually handle the request */ public void onResourceRequested() { jsonResource.onResourceRequested(); } } |
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