JTree中如何添加和删除节点?

内容来源于 Stack Overflow,并遵循CC BY-SA 3.0许可协议进行翻译与使用

  • 回答 (1)
  • 关注 (0)
  • 查看 (364)

我有一个非常JTree。问题:

有时我会添加一个节点。其他时候我会把它们移走。当我pushAdd结点时,它被正确添加。当我pushRemove时

,它应该删除节点,但它没有。另外,如果我尝试添加多个节点,树将只保留我添加的第一个节点。

我在这里做错了什么?

import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;


public class TreeTest {
    private JFrame myFrame;
    private JTree myTree;
    private JButton addButton, removeButton;

    private int numberOfNodes;
    private DefaultMutableTreeNode rootNode;

    private ArrayList<String> graphicIDS;
    private ArrayList<String> graphicInfo;

    public static void main (String [ ] args){
        new TreeTest();
    }

    public TreeTest() {
        graphicIDS = new ArrayList<String>();
        numberOfNodes = 0;
        graphicInfo = new ArrayList<String>();
        graphicInfo.add("Info A");
        graphicInfo.add("Info B");
        graphicInfo.add("Info C");
        graphicInfo.add("Info D");

        JPanel panel = new JPanel(new GridBagLayout());
        GridBagConstraints c = new GridBagConstraints();
        myFrame = new JFrame("JTree test");
        myFrame.setResizable(false);
        myFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

        c.fill = GridBagConstraints.BOTH;
        c.anchor = GridBagConstraints.NORTH;
        c.gridx = 0;
        c.gridy = 0;
        c.gridwidth = 2;
        c.insets = new Insets(5,5,5,5);

        rootNode = new DefaultMutableTreeNode("Root node");
        myTree = new JTree(rootNode);
        myTree.setPreferredSize(new Dimension(200, 500));
        panel.add(myTree, c);

        c.gridwidth = 1;
        c.gridy++;
        removeButton = new JButton("Remove");
        removeButton.setEnabled(false);
        removeButton.addActionListener(new ActionListener (){
            @Override
            public void actionPerformed(ActionEvent e) {    
                System.out.println("Removed curve "+(graphicIDS.size()));
                graphicIDS.remove(graphicIDS.size()-1);
                numberOfNodes--;
                updateMeasurementsTree();
            }
        });
        panel.add(removeButton, c);

        c.gridx++;
        addButton = new JButton("Add");
        addButton.addActionListener(new ActionListener (){
            @Override
            public void actionPerformed(ActionEvent e) {
                graphicIDS.add("Curve "+(numberOfNodes+1));
                System.out.println("Added curve "+(numberOfNodes+1));
                numberOfNodes++;
                updateMeasurementsTree();
            }
        });
        panel.add(addButton, c);

        myFrame.getContentPane().add(panel);
        myFrame.pack();
        myFrame.setVisible(true);
    }

    public void updateMeasurementsTree(){
        rootNode.removeAllChildren();

        for(int i=0; i<numberOfNodes;i++){  
            String idString = graphicIDS.get(i);
            DefaultMutableTreeNode idNode = new DefaultMutableTreeNode("Graphic "+idString);
            rootNode.add(idNode);
            int randomValue = (int) Math.floor(Math.random()*graphicInfo.size());
            String infoString = graphicInfo.get(randomValue);
            DefaultMutableTreeNode infoNode = new DefaultMutableTreeNode("Info "+infoString);
            idNode.add(infoNode);
        }
        if(numberOfNodes==0) removeButton.setEnabled(false);
        else{
            removeButton.setEnabled(true);
            expandAll();
        }
    }

    public void expandAll() {
        int row = 0;
        while (row < myTree.getRowCount()) {
          myTree.expandRow(row);
          row++;
        }
    }
}
提问于
用户回答回答于

我不知道你为什么要删除和重新创建所有的节点。

应该始终通过模型进行更新。

直接更新模型:

DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
model.insertNodeInto(new DefaultMutableTreeNode("another_child"), root, root.getChildCount());

更新树节点,然后通知模型:

DefaultTreeModel model = (DefaultTreeModel)tree.getModel();
DefaultMutableTreeNode root = (DefaultMutableTreeNode)model.getRoot();
root.add(new DefaultMutableTreeNode("another_child"));
model.reload(root);

移除节点也是如此。DefaultTreeModel有一个它将直接更新模型。也可以使用DefaultMutableTreeNode类的Remove(...)方法。在这种情况下,您需要reload()。

所属标签

可能回答问题的人

  • 天使的炫翼

    15 粉丝531 提问35 回答
  • 旺仔小小鹿

    社区 · 运营 (已认证)

    48 粉丝0 提问27 回答
  • 富有想象力的人

    2 粉丝0 提问26 回答
  • 发条丶魔灵1

    6 粉丝525 提问25 回答

扫码关注云+社区

领取腾讯云代金券