Write Custom Gadget

Version 2 by Robin Shen
on Oct 14, 2011 02:41.

<< Changes from 1 to 2
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Version 3 by Robin Shen
on Oct 14, 2011 02:46.

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 We will further enhance the plugin in tutorial [create your first plugin] to add a custom gadget to display a specified message. Firstable, we create below class:
  We will further enhance the plugin in tutorial [write your first plugin] to add a custom gadget to display a specified message. Firstable, we create below class:
 {code}
package com.pmease.quickbuild.plugin.basis;
  package com.example.myplugin;
  
 import org.apache.wicket.Component;
 import org.apache.wicket.behavior.AttributeAppender;
 import org.apache.wicket.markup.html.basic.Label;
 import org.hibernate.validator.constraints.NotEmpty;
import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
  
import com.pmease.quickbuild.Context;
 import com.pmease.quickbuild.ScriptEngine;
 import com.pmease.quickbuild.annotation.Editable;
import com.pmease.quickbuild.annotation.Multiline;
 import com.pmease.quickbuild.annotation.Scriptable;
 import com.pmease.quickbuild.extensionpoint.support.Gadget;
 import com.pmease.quickbuild.extensionpoint.support.GadgetCategory;
import com.pmease.quickbuild.util.ExceptionUtils;
  
@Editable(name="Html Message", order=100000, category=GadgetCategory.OTHERS)
 public class MessageGadget extends Gadget {
  @Editable(name="My Message", order=100001, category=GadgetCategory.OTHERS)
 public class MyMessageGadget extends Gadget {
  
  private static final long serialVersionUID = 1L;
  
private static final Logger logger = LoggerFactory.getLogger(MessageGadget.class);
  
  private String message;
  
@Editable(name="Message", description="Specify a message to display. Html tags can be used " +
  "to format the message.")
   @Editable(name="Message", description="Specify a message to display.")
  @NotEmpty
@Multiline
  @Scriptable
  public String getMessage() {
  return message;
  }
  
  @Override
  public String getCssClass() {
  return "window";
  }
  
  public void setMessage(String message) {
  this.message = message;
  }
  
  @Override
  public Component renderBody(String componentId) {
String interpolated;
  try {
  interpolated = ScriptEngine.instance.interpolate(getMessage(),
  Context.buildEvalContext(null, null));
  return new Label(componentId, interpolated).setEscapeModelStrings(false)
  .add(new AttributeAppender("class", "p8p"));
  } catch (Exception e) {
  logger.error("Error interpolating message.", e);
  interpolated = StringEscapeUtils.escapeHtml(ExceptionUtils.extractImportantMessage(e));
  return new Label(componentId, "<div class='red'>" + interpolated + "</div>")
  .setEscapeModelStrings(false).add(new AttributeAppender("class", "p8p"));
  }
   return new Label(componentId, getMessage()).add(new AttributeAppender("class", "p8p"));
  }
  
 }
 
 {code}
  
 Then modify class _MyPlugin_ to contribute the message gadget: