java - 如何为 jface treeviewer 创建鼠标右键菜单

Question

我已经创建了一个TreeViewer使用 JFace，但现在我必须向节点添加一个右键单击侦听器。右键单击完成后，它必须显示如下菜单：

1. 做一点事
2. 没做什么
3. 删除

我正在尝试按如下方式执行此操作，但它会引发空指针异常。

MenuManager menuMgr = new MenuManager();
        menuMgr.setRemoveAllWhenShown(true);

        menuMgr.addMenuListener(new IMenuListener() {
            @Override
            public void menuAboutToShow(IMenuManager menuManager) {

                IContributionManager menu = null;
                MenuItem[] items = (MenuItem[]) menu.getItems();
                for (int i = 0; i < items.length; i++)
                    items[i].dispose();

                MenuItem itemCollectionFolder = new MenuItem((Menu) menu, SWT.NONE);
                itemCollectionFolder.setText("Add Something" );

                MenuItem itemNewTestCase = new MenuItem((Menu) menu, SWT.NONE);
                itemNewTestCase.setText("Do Nothing" );

            }
        });

        Control tree = treeViewer.getControl();

        Menu menu = menuMgr.createContextMenu(tree);

        tree.setMenu(menu);

Answer 1

试试这个，别忘了调用：createContextMenu(viewer);

/**
 * Creates the context menu
 *
 * @param viewer
 */
protected void createContextMenu(Viewer viewer) {
    MenuManager contextMenu = new MenuManager("#ViewerMenu"); //$NON-NLS-1$
    contextMenu.setRemoveAllWhenShown(true);
    contextMenu.addMenuListener(new IMenuListener() {
        @Override
        public void menuAboutToShow(IMenuManager mgr) {
            fillContextMenu(mgr);
        }
    });

    Menu menu = contextMenu.createContextMenu(viewer.getControl());
    viewer.getControl().setMenu(menu);
}

/**
 * Fill dynamic context menu
 *
 * @param contextMenu
 */
protected void fillContextMenu(IMenuManager contextMenu) {
    contextMenu.add(new GroupMarker(IWorkbenchActionConstants.MB_ADDITIONS));

    contextMenu.add(new Action("Do Something") {
        @Override
        public void run() {
            // implement this
        }
    });
    contextMenu.add(new Action("Do Nothing") {
        @Override
        public void run() {
            // don't do anything here
        }
    });
    contextMenu.add(new Action("Delete") {
        @Override
        public void run() {
            // implement this
        }
    });
}

要获取 treeviewer 的选定元素，请执行以下操作：

IStructuredSelection selection = (IStructuredSelection) viewer.getSelection();
selection.getFirstElement();
selection.toList(); // or if you handle multi selection