Hi,
Take a look at the Tapestry Tree component to see how recursive rendering
can be done.
--
Chris
On Fri, Mar 18, 2016 at 6:17 AM, Qbyte Consulting <qbyteconsult...@gmail.com
> wrote:
> I am creating a Menu component (for a ul tag) that needs to
> programmatically generate the child links.
>
> I already have a MenuItem component, but this is parameter bound to a
> template, whereas now I need to programmatically drive the parameters.
>
> I either need to be able to create the existing MenuItem objects somehow in
> the Menu component and render them, or I simply write the links out in the
> menu - however since my Menu component isn't extending AbstractLink (like
> MenuItem) I can't use writeLink().
>
> Any ideas what is the simplest approach to resolve this? Code below.
>
> John
>
>
> public class Menu {
>
> /** The text. */
> @Parameter(required = true, allowNull = false, defaultPrefix =
> BindingConstants.LITERAL)
> private String name;
>
> /** The resources. */
> @Inject
> private ComponentResources resources;
>
> /** The component source. */
> @Inject
> private ComponentSource componentSource;
>
> @Inject
> private PageRenderLinkSource linkSource;
>
> /** The messages. */
> @Inject
> private Messages messages;
>
> @Inject
> private MenuService menuService;
>
> /** The state bean. */
> @SessionState(create = false)
> private SessionStateBean stateBean;
>
> /**
> * If provided, this is the activation context for the target page (the
> * information will be encoded into the URL). If not provided, then the
> * target page will provide its own activation context.
> */
> @Parameter
> private Object[] context;
>
> /**
> * Begin render.
> *
> * @param writer the writer
> */
> void beginRender(MarkupWriter writer) {
> writer.element("ul");
> for (String pageName :
> menuService.getPageNames(MenuService.Menu.valueOf(name))) {
> renderMenuItem(pageName, writer);
> }
> }
>
> private void renderMenuItem(String page, MarkupWriter writer) {
> Link link = resources.createPageLink(page,
> resources.isBound("context"), context);
> writer.element("li");
> NO!! writeLink(writer, link);
> writer.writeRaw(messages.get(page.toLowerCase().concat(".link")));
> writer.end();
> writer.end();
> }
>
> /**
> * After render.
> *
> * @param writer the writer
> */
> void afterRender(MarkupWriter writer) {
> writer.end();
> }
> }
>
>
> public class MenuItem extends AbstractLink {
>
> /**
> * The logical name of the page to link to.
> */
> @Parameter(required = true, allowNull = false, defaultPrefix =
> BindingConstants.LITERAL)
> private String page;
>
> /** The text. */
> @Parameter(required = true, allowNull = false, defaultPrefix =
> BindingConstants.LITERAL)
> private String text;
>
> /** The resources. */
> @Inject
> private ComponentResources resources;
>
> /** The component source. */
> @Inject
> private ComponentSource componentSource;
>
> /** The state bean. */
> @SessionState(create = false)
> private SessionStateBean stateBean;
>
> /**
> * If provided, this is the activation context for the target page (the
> * information will be encoded into the URL). If not provided, then the
> * target page will provide its own activation context.
> */
> @Parameter
> private Object[] context;
>
> /**
> * Begin render.
> *
> * @param writer the writer
> */
> void beginRender(MarkupWriter writer) {
> if (isDisabled())
> return;
> Link link = resources.createPageLink(page,
> resources.isBound("context"), context);
> writer.element("li");
> writeLink(writer, link);
> writer.writeRaw(text);
> }
>
> /**
> * After render.
> *
> * @param writer the writer
> */
> void afterRender(MarkupWriter writer) {
> if (isDisabled())
> return;
> writer.end();
> writer.end();
> }
> }
>
