右键单击节点上的 JTree 和下拉选项 [英] JTree and dropdown options on right clicking nodes

问题描述

我正在尝试使用 JTree 并为所有父节点和子节点实现不同的下拉菜单.

I'm trying to use the JTree and implement different drop downs for all the parent nodes and the children nodes.

这是我所做的:

pmTree.addMouseListener(new java.awt.event.MouseAdapter() {
        @Override
        public void mouseClicked(java.awt.event.MouseEvent evt) {
            try {
            if(evt.getButton() == evt.BUTTON1) {
            }
            else if (evt.getButton() == evt.BUTTON3) {
                TreePopup(evt);
                //pmTree.updateUI();
            }
            }catch (Exception e) {}
        }
    });

和弹出代码:

public void TreePopup(java.awt.event.MouseEvent evt) {
    DefaultMutableTreeNode node = (DefaultMutableTreeNode)  pmTree.getLastSelectedPathComponent();
    popup = new JPopupMenu();
    popup.setInvoker(pmTree);
    PopupHandler handler = new PopupHandler(pmTree, popup);
    if(node.getLevel() == 1)
    {
        popup.add(getMenuItem("Parent Node", handler));
    }
    else if(node.getLevel() == 2)
    {
        popup.add(getMenuItem("Child", handler));
     }
     }

和 PopUpHandler:

and PopUpHandler:

public class PopupHandler extends javax.swing.JFrame implements ActionListener {
JPopupMenu popup;
Point loc;

public PopupHandler(JTree tree, JPopupMenu popup) {
    //this.tree = NewJFrame.pmTree;
    this.popup = popup;
    tree.addMouseListener(ma);
}

还有

public void actionPerformed(java.awt.event.ActionEvent evt)  

对于被点击的子节点或父节点.

for the Child or Parent node being clicked.

但是，当我运行程序时，子节点和父节点都会出现相同的右键单击弹出窗口.

However, when I run the program, I get the SAME right click popups for both the child and parent node.

抱歉，代码量很大.我已经坚持了2天，但没有成功.谢谢！

Sorry for the huge chunk of code. I've been stuck with it for 2 days and yet not successful. Thanks!

推荐答案

你检查选中的节点:

DefaultMutableTreeNode node = (DefaultMutableTreeNode)pmTree.getLastSelectedPathComponent();

查看您是否有父"或子"节点.您应该先选择鼠标位置的节点，否则它将不是正确的节点.打电话

to see if you have a "parent" or a "child" node. You should select the node at the mouse position first, otherwise it will not be the right node. Call

TreePath path = pmTree.getPathForLocation(evt.getX(), evt.getY());
if (path != null) {
    pmTree.setSelectionPath(path);
} else {
    return;
}

在 treePopup 的开头.(Java 中的方法应该以小写字母开头！)

at the beginning of treePopup. (methods in Java should start with a lower case letter!)

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