View source for HelloWorld Example

HelloWord example will add a new Widget in tab documents user interface.

Create a file called '''HelloWorld.gwt.xml''' into '''src/main/resources/com/openkm/extension/frontend'''
<source lang="xml">
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module SYSTEM "http://google-web-toolkit.googlecode.com/svn/releases/2.0/distro-source/core/src/gwt-module.dtd">
<module>
  <!-- Inherit the core Web Toolkit stuff -->
  <inherits name='com.google.gwt.user.User'/>
  <inherits name="com.google.gwt.http.HTTP"/>
</module>
</source>

Edit '''Customization.gwt.xml''' into '''src/main/resources/com/openkm/extension/frontend''' and add the new module
<source lang="xml">
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module SYSTEM "http://google-web-toolkit.googlecode.com/svn/releases/2.0/distro-source/core/src/gwt-module.dtd">
<module>
  <!-- Inherit the extension widgets -->
  <inherits name="com.openkm.extension.frontend.HelloWorld"/>
</module>
</source>

Create a file called '''HelloWorld.java''' into '''src/main/java/com/openkm/extension/frontend/client'''
<source lang="java">
public class HelloWorld extends TabDocumentExtension {
	Button refresh;
	VerticalPanel vPanel;
	
	public HelloWorld() {
		HTML html = new HTML("Hello Word");
		refresh = new Button("refresh UI");
		refresh.addClickHandler(new ClickHandler() {
			@Override
			public void onClick(ClickEvent event) {
				GeneralComunicator.refreshUI();
			}
		});
		vPanel = new VerticalPanel();
		vPanel.add(html);
		vPanel.add(refresh);
		
		refresh.setStyleName("okm-Input");
		
		initWidget(vPanel);
	}

	@Override
	public String getTabText() {
		return "Hello tab";
	}

	@Override
	public void set(GWTDocument doc) {
		// TODO Auto-generated method stub
	}

	@Override
	public void setVisibleButtons(boolean visible) {
		// TODO Auto-generated method stub
		
	}

        @Override
        public String getExtensionUUID() {
                return String.valueOf("d9dab640-d098-11df-bd3b-0800200c9a66");
        }
}
</source>

Edit Customization.java OpenKM class and add the HelloWorld widget
<source lang="java">
public class Customization {
	
	/**
	 * getExtensionWidgets
	 * 
	 * @return
	 */
	public static List<Object> getExtensionWidgets() {
		List<Object> extensions = new ArrayList<Object>();
		
		// Declare here your widget extensions
		extensions.add(new HelloWorld());
		
		return extensions;
	}
}
</source>

Now you only need to recompile project.

[[File:Okm_extension_001.jpeg‎|center]]

[[Category: Extension Guide]]