Reducing and re-using code

Reducing and re-using code

Reducing and re-using code

While small-scale code reuse is often impractical in a traditional Web rendering path, Wicket's ambitiously object-oriented rendering engine fosters sharing of both user-interface logic and layout among pages. pandora bracelets By encouraging pragmatic, everyday code reuse, Wicket brings the best of desktop application programming to the Web.

This series, which began with an article on stateful and stateless modes of Wicket development, now moves on to the rendering engine that is built on that abstracted state. What does it take to make custom components, and how do they facilitate reuse? To find out, you'll take the sample calculator application from the previous article in this series and refactor it to eliminate its redundant layout code, then proceed to apply permutations of calculators to a pair of application pages.

From pages to panels

A WebPage subclass is itself a custom component: if you've programmed in Wicket, you've authored components pandora charms in Wicket (no certification required). But pages are pretty monolithic. The most common way to make a portion of one page reusable is to move that part into a panel. Like a page, a Wicket panel has an associated HTML template file. It incorporates chunks of layout and functionality that can be dropped into any page of an application.

In migrating functionality from a page to a panel, the first step is to create a new Panel subclass. As a normal component (not a page), the Panel must be initialized with a component identifier; your subclass constructor must call super() with an ID. For the calculator application, you'll want a base class with two subclasses, similar to the old BasePage hierarchy, but with shared layout. Listing 1 shows the base panel class.

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