Context menu for TreeViewer based on selected node - SWT

Question

I need to create a context menu for a TreeViewer in an Eclipse plugin project. But, the menu should not contain constant items, they should vary depending on the type of the

Answer 1

Thats the way I do it:

MenuManager menuMgr = new MenuManager();

        Menu menu = menuMgr.createContextMenu(viewer.getControl());
        menuMgr.addMenuListener(new IMenuListener() {
            @Override
            public void menuAboutToShow(IMenuManager manager) {
                // IWorkbench wb = PlatformUI.getWorkbench();
                // IWorkbenchWindow win = wb.getActiveWorkbenchWindow();
                if (viewer.getSelection().isEmpty()) {
                    return;
                }

                if (viewer.getSelection() instanceof IStructuredSelection) {
                    IStructuredSelection selection = (IStructuredSelection) viewer.getSelection();
                    Node object = (Node)selection.getFirstElement();

                    if (object.getModel() instanceof NodeA) {
                        manager.add(new Action();
                    } else if (object.getModel() instanceof NodeB) {

                        manager.add(new OtherAction());

                    }
                }
            }
        });
        menuMgr.setRemoveAllWhenShown(true);
        viewer.getControl().setMenu(menu);

I hope this helps ;)

It is important to set removeAllWhenShown property of menu manager to false, in order to hide all the other nodes actions ;)