Custom Label Component

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Posts: 59
Joined: Wed Aug 07, 2013 11:28 pm

Custom Label Component

Fri Oct 23, 2015 7:36 pm

I am trying to create a custom component (2.7) that is a label (OutputText) but with certain parameters already set.

For example, I would have a "Label" datatype that inherits from ui::OutputText.

Then, I would like to have another component inherit from it called "WarningLabel". This WarningLabel would have certain properties defined. Like an html-class of "label-warning", a title that automatically begins with "WARNING: " so that we just type in the content and it automatically renders "WARNING: blah blah".

Little things like this help us standardize the look of our applications and speed up development.

Anyway, I can't seem to find out how to set those attributes by default. I can create the datatypes and the inheritance with no problem.

I've created a custom VaadinForms.uiComponents and point it to my datatype. But I just don't understand the properties. And, I don't see the option of defining a component as Expression Language.


Byron Glueck
Posts: 85
Joined: Thu Apr 26, 2012 8:17 pm

Re: Custom Label Component

Mon Oct 26, 2015 4:33 pm

Hello and thanks for your question.

To most conveniently address your need of applying a custom hint, consider extending UIComponentFactoryImpl. This will alleviate your need to create a separate custom UI control. Instead, you will simply process the hint, as necessary.

Update vaadin.util.LspsAppConnectorImpl:
Code: Select all
   public UIComponentFactory getComponentFactory() {
      return new MyUIComponentFactoryImpl(this);

Author your custom class. Example:
Code: Select all

import com.whitestein.lsps.vaadin.LspsAppConnector;
import com.whitestein.lsps.vaadin.ui.UIComponentData;
import com.whitestein.lsps.vaadin.ui.UIComponentFactoryImpl;
import com.whitestein.lsps.vaadin.ui.components.UIComponent;
import com.whitestein.lsps.vaadin.ui.components.UIOutputText;

 * @author bgl
public class MyUIComponentFactoryImpl extends UIComponentFactoryImpl {

   private static final long serialVersionUID = 1L;

    * @param connector
   public MyUIComponentFactoryImpl(LspsAppConnector connector) {

   protected UIComponent createComponent(UIComponentData componentData) {
      UIComponent component = super.createComponent(componentData);
      return component;

   protected void applyHint(UIComponent component, String hint, Object value) {
      if (component instanceof UIOutputText && "label-warning".equals(hint)) {
         if (Boolean.TRUE.equals(value)) {
            UIOutputText l = (UIOutputText) component;
      } else {
         super.applyHint(component, hint, value);


Then you can add custom css style. For example:
Code: Select all
.v-caption-label-warning {
   background-color: salmon;
   font-weight: bold

Finally, add the hint to the OutputText control:
Screen Shot 2015-10-26 at 10.26.06 AM.png
Screen Shot 2015-10-26 at 10.26.06 AM.png (69.5 KiB) Viewed 2480 times

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