Java 如何在netbeans可视化编辑器的JFrame中添加弹出菜单

How to add popup menu in JFrame in netbeans visual editor

提问by Ahmad Vatani

I already try to add PopUp menu to JFrame by design in Netbeans visual editor, but it don't work. Can anybody step by step hint me how to add it?? Thanks a lots!

我已经尝试在 Netbeans 可视化编辑器中通过设计将弹出菜单添加到 JFrame，但它不起作用。任何人都可以一步一步地提示我如何添加它？非常感谢！

采纳答案by Paul Samsotha

The problem is a JPopupMenuis not a component that is initially visible or added to a container. So by just dragging and dropping it into the design view frame, will have no affect visually to the design view.

问题是JPopupMenu不是最初可见或添加到容器的组件。因此，只需将其拖放到设计视图框架中，就不会在视觉上影响设计视图。

But, if you look at the source code or the navigator, you willsee the jPopupMenudeclared as a class member and instantiated in the initComponents()method.

但是，如果您查看源代码或导航器，您将看到jPopupMenu声明为类成员并在initComponents()方法中实例化。

I've attempted different things myself, and from what I've tried, it doesn't look like you can design the popup menu in a visual way. You can though, use the Navigator to design it.

我自己尝试了不同的东西，从我尝试过的东西来看，你似乎无法以可视化的方式设计弹出菜单。不过，您可以使用导航器来设计它。

1. From the Navigator, you will see the jPopupMenu1. You can add JMenusor JMenuItemsby right-clicking it and selecting Add from Palette.
2. You can then add listener to the JMenuItemby right clicking the JMenuItemfrom the navigator and slecting Events -> Actions -> actionPerformed

1. 从导航器中，您将看到jPopupMenu1. 您可以添加JMenus或JMenuItems右键单击它并选择Add from Palette。
2. 然后，您可以JMenuItem通过JMenuItem在导航器中右键单击并选择来将侦听器添加到Events -> Actions -> actionPerformed

To make the JPopupMenuappear, you need to add a MouseListenerto a component, whether it's the frame or another component. For example (to the frame):

要使JPopupMenu出现，您需要向MouseListener组件添加a ，无论是框架还是其他组件。例如（到框架）：

1. Select the frame from the Navigator and right-click it and select Events -> Mouse ->and you will need to implement both mousePressedandmouseReleased, as different platforms have different popup triggers, Windows being mouseReleasedand I think Mac is mousePressed(don't quote me).

2. Create a method to show the popup menu.

   private void showPopupMenu(MouseEvent e) {
      jPopupMenu1.show(this, e.getX(), e.getY());
   }
   

3. Implement your mousePressedand mouseReleasedmethods

   private void formMousePressed(MouseEvent evt) {                                  
       if (evt.isPopupTrigger()) {
           showPopupMenu(evt);
       }
   }                                 
   
   private void formMouseReleased(MouseEvent evt) {                                   
       if (evt.isPopupTrigger()) {
           showPopupMenu(evt);
       }
   } 
   

1. 从导航器中选择框架并右键单击它并选择Events -> Mouse ->，您将需要同时实现mousePressed和mouseReleased，因为不同的平台有不同的弹出触发器，Windows 是mouseReleased，我认为 Mac 是mousePressed（不要引用我的话）。

2. 创建一个方法来显示弹出菜单。

   private void showPopupMenu(MouseEvent e) {
      jPopupMenu1.show(this, e.getX(), e.getY());
   }
   

3. 实现你的mousePressed和mouseReleased方法

   private void formMousePressed(MouseEvent evt) {                                  
       if (evt.isPopupTrigger()) {
           showPopupMenu(evt);
       }
   }                                 
   
   private void formMouseReleased(MouseEvent evt) {                                   
       if (evt.isPopupTrigger()) {
           showPopupMenu(evt);
       }
   }