On 8 juil, 10:39, xworker <blomqvist.andr...@gmail.com> wrote:
> Hi
>
> Very new to GWT and MVP. Trying to expand the contacts example with a
> DockLayoutPanel with a tree navigation in the west section. Using MVP
> and ui:bindings.
>
> Got an DockLayoutPanelView and Presenter. Inside is a tree component
> to the west and a content component in center. How will I get the
> events from the tree component?
The generally adopted way of doing things in GWT is to have custom
events go through the event bus. In this case, you're talking about
"navigation", so maybe the concept of "place" would be better than
"just" some custom event. I encourage you to look at gwt-platform, gwt-
presenter and other MVP frameworks for GWT, and/or look at the
Activity concept from the upcoming GWT 2.1.
Using actvities, you'd have an ActivityManager managing your "center".
The tree would use the PlaceController.goTo to navigate to a new
"place". An ActivityMapper (that you passed to the ActivityManager in
the constructor) would map the place to an Activity (a presenter), and
the ActivityManager will manage the current Activity for the display
it manages, i.e.it will stop() the current activity if its ok
(willStop returns true) and then only start the new Activity, which
will call the Display back to show its view.
The tree would probably also listen to PlaceChangeEvent on the event
bus to update the selected item depending on the current place (in
case some other component calls the PlaceController.goTo)
> My DockViewPresenter:
>
> public class DockPresenter implements Presenter {
>
> public interface Display {
> Widget asWidget();
> }
>
> private final ContactsServiceAsync rpcService;
> private final HandlerManager eventBus;
> private final Display display;
> private ContactsPresenter contactsPresenter;
> private TreePresenter treePresenter;
>
> public DockPresenter(ContactsServiceAsync rpcService,
> HandlerManager eventBus, Display view) {
> this.rpcService = rpcService;
> this.eventBus = eventBus;
> this.display = view;
>
> contactsPresenter = new ContactsPresenter(rpcService,
> eventBus,
> new ContactsView());
> treePresenter = new TreePresenter(rpcService, eventBus, new
> MyTree());
> }
>
> public void bind() {
> contactsPresenter.bind();
> treePresenter.bind();
> }
>
> public void go(final HasWidgets container) {
> bind();
> container.clear();
> container.add(display.asWidget());
>
> }
>
> }
>
> As you can see I am creating the two presenters for the content and
> the tree, but I dont know how to get the events (clicks, selections)
> from them. They seem to be swallowed be the dock. I'm guessing I
> should register handlers in the bind() method, but how? When
> navigating to the tree component without the dock, events works fine.
>
> TreePresenter:
>
> public class TreePresenter implements Presenter {
>
> public interface Display {
>
> HasSelectionHandlers<TreeItem> getTree();
> Widget asWidget();
> }
>
> private final ContactsServiceAsync rpcService;
> private final HandlerManager eventBus;
> private final Display display;
>
> public TreePresenter(ContactsServiceAsync rpcService, HandlerManager
> eventBus, Display view) {
> this.rpcService = rpcService;
> this.eventBus = eventBus;
> this.display = view;
>
> }
>
> public void bind() {
>
> display.getTree().addSelectionHandler(new
> SelectionHandler<TreeItem>() {
>
> public void onSelection(SelectionEvent<TreeItem> event) {
> TreeItem item = (TreeItem) event.getSelectedItem();
> GWT.log("Node selected "+item.getText());
> }
>
> });
>
> }
>
> Thanks
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