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关于如何根据所选项目正确地将右键单击菜单连接到 a有一个很好的线程。Jface TreeViewer

我想根据以下条件显示右键菜单：右键单击是在节点上还是在“空白空间”中。问题是如果您单击空白区域，TreeViewer 不会自动清除选择。有什么干净的方法可以实现这一目标吗？

我目前的方法是MouseListener使用以下 mouseDown 方法简单地将 a 连接到树：

@Override
public void mouseDown(MouseEvent e) {
    TreeItem item = treeViewer.getTree().getItem(new Point(e.x, e.y));
    if (item == null) {
        treeViewer.getTree().deselectAll();
    }
}

这似乎工作得很好。你觉得这怎么样？

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2 回答 2

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好的，我找到了一个肮脏的解决方法。因此，如果您真的想这样做，这里有一个可能的解决方案：

final Tree tree = viewer.getTree();

final Menu menu = new Menu(tree);
tree.setMenu(menu);
menu.addMenuListener(new MenuAdapter()
{
    @Override
    public void menuShown(MenuEvent e)
    {
        Point point = tree.toControl(Display.getDefault().getCursorLocation());
        boolean found = false;
        for (TreeItem item : tree.getItems())
        {
            for (int i = 0; i < tree.getColumnCount(); i++)
                if (item.getBounds(i).contains(point))
                    found = true;
        }

        System.out.println(found);
    }
});
于 2014-09-05T10:07:03.097 回答
0 
How to add popup menu to your SWT/JFace TreeViewer
Hi, in your applications main class (that extends ApplicationWindow) in protected Control createContents(Composite parent) method you should add code like this:
//Author: Darius Kucinskas (c) 2008-2009
//Email: d[dot]kucinskas[eta]gmail[dot]com
//Blog: http://blog-of-darius.blogspot.com/
//License: GPL

// Create the popup menu
  MenuManager menuMgr = new MenuManager();
  Menu menu = menuMgr.createContextMenu(mTreeViewer.getControl());
  menuMgr.addMenuListener(new IMenuListener() {
    @Override
    public void menuAboutToShow(IMenuManager manager) {
      if(mTreeViewer.getSelection().isEmpty()) {
        return;
      }

      if(mTreeViewer.getSelection() instanceof IStructuredSelection) {
        IStructuredSelection selection = (IStructuredSelection)mTreeViewer.getSelection();
        DatabaseModelObject object = (DatabaseModelObject)selection.getFirstElement();

        if (object.getType() == DATABASE_OBJECT_TYPE.TABLE){
          manager.add(new ShowTableDataAction(SWTApp.this));
        }
      }
    }
  });

  menuMgr.setRemoveAllWhenShown(true);
  mTreeViewer.getControl().setMenu(menu);
DatabaseModelObject - is class from my problem domain (specific to my program). mTreeViewer - is object of TreeViewer class (JFace). Thanks, have a nice day!
于 2015-07-23T08:40:51.723 回答