Morris' Blog

2013-05-24 09:11:06Morris

[JAVA][作業] JList 清單使用

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按下 add 可以進行加入新項目，
當按下 Order 可以將多選的項目印出。

操作複選時，按著 Ctrl + 滑鼠點選即可。

package ce1002.E7.s100502205;

import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;

public class E7 extends JFrame {
   public JList list;
   public JTextField txtInput;
   public JButton btnAdd;
   public JButton btnOrder;
   private JScrollPane scrollPane;
   public DefaultListModel listModel;

   public E7() {
       this.setTitle("E7");
       this.setSize(500, 300);
       this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       this.setResizable(false);
       this.setLayout(new GridBagLayout());

       listModel = new DefaultListModel();
       list = new JList(listModel);
       txtInput = new JTextField();
       btnAdd = new JButton("add");
       btnOrder = new JButton("Order");
       scrollPane = new JScrollPane(list);

        list.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);

        int[] px = { 0, 0, 1, 1, 2, 3 };
        int[] py = { 0, 3, 0, 3, 3, 3 };
        int[] wx = { 1, 1, 4, 1, 1, 1 };
        int[] wy = { 3, 2, 3, 2, 2, 2 };
        Object[] obj = { new JLabel("Menu"), new JLabel("Add new item"),
                scrollPane, txtInput, btnAdd, btnOrder };
        for (int i = 0; i < px.length; i++) {
            GridBagConstraints GBC = new GridBagConstraints();
            GBC.insets = new Insets(10, 10, 10, 10);
            GBC.fill = GridBagConstraints.HORIZONTAL;
            GBC.anchor = GridBagConstraints.EAST;
            GBC.gridx = py[i];
            GBC.gridy = px[i];
            GBC.gridwidth = wy[i];
            GBC.gridheight = wx[i];
            this.add((Component) obj[i], GBC);
        }
        list.addMouseListener(new MouseAdapter() {
                @Override
                public void mouseClicked(MouseEvent e) {
                    if(e.getClickCount() == 2) {
                        int idx = list.locationToIndex(e.getPoint());
                        Object item = listModel.getElementAt(idx);
                        String text = JOptionPane.showInputDialog("Rename " + item);
                        if(text.trim().equals(""))
                            return;
                        listModel.remove(idx);
                        addItem(text);
                    }
                }
        });
        btnAdd.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if (txtInput.getText().trim().equals(""))
                    return;
                addItem(txtInput.getText().trim());
            }
        });
        btnOrder.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                printList();
            }
        });

        this.setVisible(true);
    }

    public void addItem(String str) {
        for (int i = 0; i < listModel.size(); i++) {
            if (listModel.get(i).equals(str))
                return;
        }
        listModel.addElement(str);
        txtInput.setText("");
    }

    public void printList() {
        int[] Idx = list.getSelectedIndices();
        for (int x : Idx) {
            System.out.println(listModel.get(x));
        }
    }

    public static void main(String[] args) {
        new E7();
    }

}

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