如何在e4中迁移选择提供程序

Question

I'm migrating Eclipse views to using the e4 framework, currently we use Ecipse 4.4.1 in compability mode.

In most views I'm setting the selection provider of the site:

site.setSelectionProvider(treeViewer);

In different handlers I then use code like this to get the selection:

IWorkbenchSite site = HandlerUtil.getActiveSite(event);
ISelectionProvider selectionProvider = site.getSelectionProvider();
ISelection selection = selectionProvider.getSelection();

Some handler even use the selection provider and if it is Viewer work with it eg refersh, expand...

ISelectionProvider selectionProvider = activeSite.getSelectionProvider();
if (selectionProvider instanceof StructuredViewer) {
...
}

The wiki describes how to handle selections new in e4. https://wiki.eclipse.org/E4/EAS/Selection

What I can't find is a way to migrate using the actual selection provider?

Answer 1

In an e4 handler you use something like:

@Execute
void execute(@Named(IServiceConstants.ACTIVE_SELECTION) IStructuredSelection selection
{
  ...
}

to get the active selection.

If you want to look at the active part you can use:

@Execute
void execute(@Named(IServiceConstants.ACTIVE_PART) MPart activePart)
{
  Object object = activePart.getObject();

  // 'object' is the class you defined for the part in the Application.e4xmi
}