Markup Inheritance lets a Component extend the markup of its super class. The subclass markup is inserted at one point in the super class markup.
Let’s see an example:
Parent.java:
public class Parent extends Component {}
Parent.html:
… parent content …
<wicket:child/>
… parent content …
Child.html
<wicket:extend>
… child content …
</wicket:extend>
Child.java:
public class Child extends Parent {}
Renders as:
… parent content …
… child content …
… parent content …
It is just like having a Panel defined in your Component class markup, and let subclasses add the Panel. But it doesn’t need an extra Component and is much easier to use. Markup Inheritance is also a convenient replacement for most Border components.
Markup Inheritance works with WebPages, so you can easily use the same header and footer on several pages.
