import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.JSplitPane;
import javax.swing.JLabel;
import javax.swing.JFrame;
import javax.swing.tree.TreePath;
import javax.swing.ImageIcon;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.JOptionPane;
public class MainFrame extends JFrame implements TreeSelectionListener
{
	JSplitPane sp;
	JTree tree=null;//樹類對象
	JLabel lbl=new JLabel("歡迎使用沃爾瑪銷售管理系統");
	DefaultMutableTreeNode node1=new DefaultMutableTreeNode("部門管理");
	DefaultMutableTreeNode node2=new DefaultMutableTreeNode("員工管理");
	DefaultMutableTreeNode node3=new DefaultMutableTreeNode("商品管理");
	public MainFrame()
	{
		//創建樹的根節點
		DefaultMutableTreeNode root=new DefaultMutableTreeNode("沃爾瑪銷售管理系統");
		//創建根節點下的三個子節點
		//3個子節點添加到根節點中
		root.add(node1);
		root.add(node2);
		root.add(node3);
		//創建樹對象
		tree=new JTree(root);
		tree.addTreeSelectionListener(this);
		//窗口分割為水平：左邊為樹，右邊為有圖標的標簽
		sp=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,tree,lbl);
		this.add(sp);
		this.setBounds(200,100,800,600);
		this.setVisible(true);
	}
	
	//樹節點發生改變時使用些事件處理方法來處理
	public void valueChanged(TreeSelectionEvent e)
	{
		TreePath path=e.getPath();
		DefaultMutableTreeNode node=(DefaultMutableTreeNode)path.getLastPathComponent();
		if(node.isLeaf())//判斷是否是葉節點
		{
			if(node.equals(node1))//判斷是否為第一個葉節點
			{
				sp.remove(sp.getRightComponent());
				sp.setDividerLocation(150);
				sp.add(new Department_UI(),JSplitPane.RIGHT);
			}
			else if(node.equals(node2))//判斷是否為第二個葉節點
			{
				sp.remove(sp.getRightComponent());
				sp.setDividerLocation(150);
				sp.add(new Employee_UI(),JSplitPane.RIGHT);
			}
			else if(node.equals(node3))//判斷是否為第三個葉節點
			{
				sp.remove(sp.getRightComponent());
				sp.setDividerLocation(150);
				sp.add(new Product_UI(),JSplitPane.RIGHT);
			}
		}
	}
	
	public static void main(String[] args)
	{
		new MainFrame();
	}
}