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
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