Java Swing 树组件全屏化 JPanel btnPanel = new JPanel(); //中间容器
btnPanel.setLayout(new GridLayout(1,1));
//创建JTree对象
JTree tree = new JTree(root);
//把JTree放入到窗口中进行展示
btnPanel.add(tree);
package Tree;
import javax.swing.*;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;
import java.awt.*;
/**
* Created with IntelliJ IDEA.
*
* @Author: 从南到北
* @Date: 11/26/2021/11:11
* @Description:
*
*/
public class TreePre extends JFrame implements TreeModelListener {
DefaultMutableTreeNode root =new DefaultMutableTreeNode("今天要买的东西");
//使用DefaultMutableTreeNode创建4个枝节点
DefaultMutableTreeNode node1 =new DefaultMutableTreeNode("蔬菜");
DefaultMutableTreeNode node2 =new DefaultMutableTreeNode("水果");
DefaultMutableTreeNode node3 =new DefaultMutableTreeNode("礼品");
DefaultMutableTreeNode node4 =new DefaultMutableTreeNode("家用小物品");
//定义按钮，完成操作
JButton addSiblingBtn = new JButton("添加兄弟结点");
JButton addChildBtn = new JButton("添加子结点");
JButton deleteBtn = new JButton("删除结点");
JButton editBtn = new JButton("编辑当前结点");
public TreePre(){
setTitle("购物清单");
JPanel panel = new JPanel(); //创建中间容器
// setContentPane(panel); //添加中间容器
//将4个枝节点添加到根节点
root.add(node1);
root.add(node2);
root.add(node3);
root.add(node4);
//使用其创建叶节点，并且将叶子节点添加到不同的枝节点上
DefaultMutableTreeNode baicai =new DefaultMutableTreeNode("白菜");
node1.add(baicai);
DefaultMutableTreeNode dasuan = new DefaultMutableTreeNode("大蒜");
node1.add(dasuan);
DefaultMutableTreeNode tudou = new DefaultMutableTreeNode("土豆");
node1.add(tudou);
DefaultMutableTreeNode pingguo = new DefaultMutableTreeNode("苹果");
node2.add(pingguo);
DefaultMutableTreeNode xiangjiao = new DefaultMutableTreeNode("香蕉");
node2.add(xiangjiao);
DefaultMutableTreeNode xigua = new DefaultMutableTreeNode("西瓜");
node2.add(xigua);
DefaultMutableTreeNode lipin = new DefaultMutableTreeNode("礼品");
node3.add(lipin);
DefaultMutableTreeNode maotai = new DefaultMutableTreeNode("茅台酒");
node3.add(maotai);
DefaultMutableTreeNode maipian = new DefaultMutableTreeNode("营养麦片");
node3.add(maipian);
DefaultMutableTreeNode shipin = new DefaultMutableTreeNode("保健食品");
node3.add(shipin);
DefaultMutableTreeNode weijing = new DefaultMutableTreeNode("味精");
node4.add(weijing);
DefaultMutableTreeNode jiangyou = new DefaultMutableTreeNode("酱油");
node4.add(jiangyou);
DefaultMutableTreeNode xijiejing = new DefaultMutableTreeNode("洗洁精");
node4.add(xijiejing);
DefaultMutableTreeNode baoxiandai = new DefaultMutableTreeNode("保鲜袋");
node4.add(baoxiandai);
JTree tree = new JTree(root); //创建一个系统默认的树组件
tree.setEditable(true); //设置JTree为可编辑
DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
addSiblingBtn.addActionListener(e -> {
//添加兄弟结点的逻辑
// 1， 获取当前选中节点
// DefaultMutableTreeNode这个是一个实现类
DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
//如果结点为空，则直接返回
if (selectedNode == null){
return;
}
// 2，获取该选中结点的父结点
DefaultMutableTreeNode parent = (DefaultMutableTreeNode)selectedNode.getParent();
//如果父结点为空，则直接返回
if (parent==null){
return;
}
// 3，创建一个新结点
DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("新结点");
// 4，把新结点通过父结点进行添加
//获取选中结点的索引
int selectedIndex = parent.getIndex(selectedNode);
//在选中位置插入新结点
model.insertNodeInto(newNode,parent,selectedIndex);
// 5，显示新结点
//获取从根结点到新结点的所有结点,这个函数是返回从根节点到newNode新节点的路径
TreeNode[] pathToRoot = model.getPathToRoot(newNode);
//使用指定的结点数组创建TreePath
TreePath treePath = new TreePath(pathToRoot);
//显示指定的treePath
tree.scrollPathToVisible(treePath); //将视野移动到这个新节点
//6，重绘tree
tree.updateUI();
// label.setText("新增节点成功");
});
/**
* 添加子节点
*/
addChildBtn.addActionListener(e -> { //兰姆达表达式写法，会更方便点
//为选中节点添加子节点
//1，获取选中结点
DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
if (selectedNode==null){
return ;
}
//2，创建新结点
DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("新结点");
//3，把新节点添加到当前节点中
//model.insertNodeInto(newNode,selectedNode,selectedNode.getChildCount());使用TreeModel的方法添加，不需要手动刷新UI
selectedNode.add(newNode);//使用TreeNode的方法添加，需要手动刷新UI
//4，显示新节点
//显示新结点
TreeNode[] pathToRoot = model.getPathToRoot(newNode);
TreePath treePath = new TreePath(pathToRoot);
tree.scrollPathToVisible(treePath);
//5，重绘ui
//手动刷新UI
tree.updateUI();
// label.setText("新增子节点成功");
});
/**
* 删除节点
*/
deleteBtn.addActionListener(e -> {
DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
if (selectedNode!=null && selectedNode.getParent()!=null){
//删的时候要找到其父节点才能删，所以说，最后的那个根节点，不能删
model.removeNodeFromParent(selectedNode);
}
// label.setText("删除节点成功");
});
/**
* 编辑节点
*/
//实现编辑结点的监听器
editBtn.addActionListener(e -> {
//获取当前选中节点的路径
TreePath selectionPath = tree.getSelectionPath();
//判断路径不为空，则设置最后一个节点可以编辑
if (selectionPath!=null){
//编辑选中结点
tree.startEditingAtPath(selectionPath);
}
});
//panel用来写按钮
panel.add(addSiblingBtn);
panel.add(addChildBtn);
panel.add(deleteBtn);
panel.add(editBtn);
panel.setLayout(new FlowLayout());
/**
* panel用来装按钮
* panel1用来装树和按钮
* tabbedPane用来装选项卡
* 创建一个面板,用来装树和按钮
*创建一个分隔栏
*左边设置为树和添加按钮，右边设置为选项卡组件
*
*/
JPanel panel1 = new JPanel();
// panel1.add(panel,BorderLayout.NORTH);
//
// panel1.add(new JScrollPane(tree),BorderLayout.EAST);
panel1.setLayout(new GridLayout(2,1));
panel1.add(new JScrollPane(tree));
panel1.add(panel);
// add(panel, BorderLayout.NORTH);
// add(new JScrollPane(tree),BorderLayout.CENTER);
JSplitPane js = new JSplitPane();
js.setOneTouchExpandable(true);
js.setContinuousLayout(true);
js.setPreferredSize(new Dimension(300,400));
js.setOrientation(JSplitPane.HORIZONTAL_SPLIT);
js.setDividerSize(1);
js.setDividerLocation(50);
// JPanel panel2 = new JPanel();
JButton jButton = new JButton();
//-------------------
JTabbedPane tabbedPane= new JTabbedPane(); //创建一个选项卡容器
setContentPane(tabbedPane); //将之添加到顶层容器内
JPanel P1=new JPanel();
JPanel P2=new JPanel();
JPanel P3=new JPanel();
Label a1 = new Label("内容1");
Button b2 = new Button("内容2");
Label a3 = new Label("内容3");
P1.add(a1);
P2.add(b2);
P3.add(a3);
//添加选项卡容器，并且设置其中每一个选项卡的标签以及是否可启用
tabbedPane.addTab("选项卡1",P1);
// 设置 index 位置的选项卡是否可用
// tabbedPane.setEnabledAt(0,true);
// 设置 index 位置的选项卡的标题
// tabbedPane.setTitleAt(0,"个人收入状况");
tabbedPane.addTab("选项卡2",P2);
// tabbedPane.setEnabledAt(1,true);
// tabbedPane.setTitleAt(1,"工资");
tabbedPane.addTab("选项卡3",P3);
// tabbedPane.setEnabledAt(2,true);
// tabbedPane.setTitleAt(2,"奖金");
// 设置默认选中的选项卡
tabbedPane.setSelectedIndex(1);
// setSize(500,300);
tabbedPane.setPreferredSize(new Dimension(500,200));
/**
* 设置选项卡左右两边的内容
* 并将选项卡放到顶层容器中
*
*/
js.setLeftComponent(panel1); //左边内容
js.setRightComponent(tabbedPane); //右边内容
setContentPane(js);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);
}
public static void main(String[] args) {
new TreePre();
}
@Override
public void treeNodesChanged(TreeModelEvent e) {
}
@Override
public void treeNodesInserted(TreeModelEvent e) {
}
@Override
public void treeNodesRemoved(TreeModelEvent e) {
}
@Override
public void treeStructureChanged(TreeModelEvent e) {
}
}
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