GWT：用鼠标右键选择一个TreeItem

问题描述

我捕捉一个右键单击事件来显示一个上下文菜单。我无法弄清楚的是，如何在显示上下文菜单之前实际选择TreeItem。

I'm capturing a right click event to show a context menu. What I haven't been able to figure out, is how to make the right click actually select the TreeItem, prior to showing of context menu.

所有帮助表示感谢。

All help is appreciated.

 private Tree tree = new Tree() {
  @Override
  public void onBrowserEvent(Event event) {   
    if (event.getTypeInt() == Event.ONCONTEXTMENU) {
     DOM.eventPreventDefault(event);          
     showContextMenu(event);
    }   
   super.onBrowserEvent(event);
  }

  @Override
  protected void setElement(Element elem) {
   super.setElement(elem);
   sinkEvents(Event.ONCONTEXTMENU);
  }

 };

推荐答案

您可以使用专用的重载TreeItem：

You can use dedicated overloaded TreeItem :

public class MyTreeItem extends TreeItem implements ContextMenuHandler {


    public SBTreeItem(SBItemTree tree, String name) {
        super();
        Label w = new Label(name);
        w.addDomHandler(this, ContextMenuEvent.getType());
        setWidget(w);
    }

            public void onContextMenu(ContextMenuEvent event) {
        Window.alert(getSBItem().getName());
        event.getNativeEvent().stopPropagation();

    }

   }

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