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One of the objectives of Eclipse 4.0 was to make rich client development easier. One good example is the following use case: One view provides a selection (e.g. using a JFace TableViewer) and another view wants to get notified about a new selection of a domain object to get the chance to react on it.
First the selection provider part. The selection services can be easily injected using dependency injection.
@Inject private ESelectionService selectionService;
When using a JFace viewer, the viewer selection has to be forwarded to the selction service:
tableViewer.addSelectionChangedListener(new ISelectionChangedListener() {
@Override
public void selectionChanged(SelectionChangedEvent event) {
IStructuredSelection selection =
(IStructuredSelection) event.getSelection();
selectionService.setSelection(selection.getFirstElement());
}
});
On the consumer side, the domain object is injected using an @Optional and @Named active selection. The following code snipped is part of a details view POJO that used es WritableValue (Eclipse data binding) to as holder for the actual domain object of type IContact.
@Inject
public void setSelection(
@Optional @Named(IServiceConstants.ACTIVE_SELECTION) IContact contact) {
if (contact != null) {
contactValue.setValue(contact);
}
}
That’s pretty convenient and concise compared with the code needed in Eclipse 3.x.
Have Fun!
Kai
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