Creating components in onBeforeRender() method

[Michal Kurtak]

Hello,

I am working on a library based on wicket framework and I couldnt find
some suitable solution when creating component hierarchies.
For example I have a base class AbstractLink for links (DownloadLink,
LabelLink, IconLink, SubmitLink, ...):

public abstract class AbstractLink extends Panel
{
          private ILinkComponent linkComponent;
          private boolean attached= false;

          protected void onBeforeRender()
          {
        if(!attached)
        {
                removeAll();
                linkComponent = createLinkComponent();
                        linkComponent.setWidht(150, Unit.PX);
                        add(linkComponent);

                       attached = true;
        }
         }

         protected abstract ILinkComponent createLinkComponent(String id);

        // PROBLEM METHOD - NOT SURE that linkComponent exists
        public void setTooltip(IModel tooltip)
        {
             linkComponent.setTooltip(tootlip);
        }
}

public abstract class LabelLink extends AbstractLink
{
         private IModel labelModel;

         public LabelLink(IModel labelModel)
         {
                this.labelModel= labelModel;
         }

         protected ILinkComponent createLinkComponent(String id)
         {
                   Link linkComponent = new Link(id);
                   linkComponent.add(new Label(labelModel));
                   return linkComponent;
         }
}

Subclassing panels are responsible for creating linkComponent.
Overriden method createLinkComponent() usually uses attribute from
subclass (labelModel in LabelLink). For this reason I couldnt call
createLinkComponent in AbstractLink's constructor (LabelLink attribute
labelModel is null). So I use the trick with onBeforeRender method.

The problem is that I couldnt write methods (setTooltip) delegating to
linkComponent in AbstractLink, because i cannot be sure that
linkComponent exists.

Is there someone who solved this sort of problem? Or how do you handle
similar situations?

Thanks,
michal

---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org
For additional commands, e-mail: users-h...@wicket.apache.org