JTree总结

ゞ浴缸里的玫瑰 2022-08-10 19:59 128阅读 0赞

1、获取当前选中子节点

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

2、(DefaultTreeModel)tree.getModel()  //添加删除修改树节点时，先将树转换为模型

public void actionPerformed(ActionEvent e) {
    		DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree
    				.getLastSelectedPathComponent();// 获取选择的当前节点
    		if (e.getSource() == addItem) {
    			// 为node添加子节点到所有子节点的最后
    			((DefaultTreeModel) tree.getModel()).insertNodeInto(
    					new DefaultMutableTreeNode("Test"), node, node
    							.getChildCount());
    			tree.expandPath(tree.getSelectionPath());
    		} else if (e.getSource() == delItem) {
    			if (node.isRoot()) {
    				return;
    			}
    			// 首先得到模型，转换为DefaultTreeModel,获取到树模型，从父节点上移除该子节点
    			((DefaultTreeModel) tree.getModel()).removeNodeFromParent(node);
    		} else if (e.getSource() == editItem) {
    			tree.startEditingAtPath(tree.getSelectionPath());//不太灵，不能保存
    		}
    	}

3、设置树形的节点选择模式

tree.getSelectionModel().setSelectionMode(
    				TreeSelectionModel.SINGLE_TREE_SELECTION);

4、获取每一级节点，分别做处理

valueChanged()是实现了TreeSelectionListener的方法

@Override
    	public void valueChanged(TreeSelectionEvent e) {
    		// 获取选择的节点
    		DefaultMutableTreeNode node = (DefaultMutableTreeNode) jTree.getLastSelectedPathComponent();
    		if (node.getLevel() == 0) {
    			// 显示提示信息
    			JOptionPane.showMessageDialog(null, node.getUserObject() + ": 共"+ node.getChildCount() + "个国家");
    		} else if (node.getLevel() == 1) {
    			// 显示提示信息
    			JOptionPane.showMessageDialog(null, node.getUserObject() + ": 共"+ node.getChildCount() + "名名将");
    		} else if (node.getLevel() == 2) {
    			// 显示提示信息
    			JOptionPane.showMessageDialog(null, node.getParent() + "名将: "+ node.getUserObject());
    		}
    	}

5、window不同的风格通过UIManager.setLookAndFeel(lookAndFeel);来设置。

lookAndFeel的不同种类有空再研究