invoicepopup.java

Java程序设计技巧与开发实例附书源代码。

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

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

public class InvoicePopup
    extends MouseAdapter
    implements ActionListener {
  private JPopupMenu menu = new JPopupMenu("Table Options");
  private JMenuItem add = new JMenuItem("Add Item");
  private JMenuItem del = new JMenuItem("Delete Item");
  private JMenuItem mod = new JMenuItem("Modify Item");
  private Invoicer parent = null;

  public InvoicePopup(Invoicer _parent) {
    parent = _parent;
    menu.add(add);
    add.addActionListener(this);
    menu.add(mod);
    mod.addActionListener(this);
    menu.add(new JPopupMenu.Separator());
    menu.add(del);
    del.addActionListener(this);
  }

  public void mousePressed(MouseEvent me) {
    if (SwingUtilities.isRightMouseButton(me)) {
      menu.show(parent.table, me.getX(), me.getY());
    }
  }

  public void actionPerformed(ActionEvent ae) {
    if (ae.getSource() == add) {
      add();
    }
    else if (ae.getSource() == del) {
      delete();
    }
    else if (ae.getSource() == mod) {
      modify();
    }
  }

  private void delete() {
    /*从表格中删除当前选择的行*/
    int row = parent.table.getSelectedRow();
    if (row >= 0) {
      String msg = "Delete '" + parent.data.getValueAt(row, 1) + "'?";
      if (JOptionPane.showConfirmDialog(parent, msg, "Confirm Deletion",
                                        JOptionPane.OK_CANCEL_OPTION,
                                        JOptionPane.WARNING_MESSAGE)
          == JOptionPane.YES_OPTION) {
        parent.data.removeRow(row);
        parent.price.setText("Total Price: ￥" + parent.total());
      }
    }
  }

  private void add() {
    /*弹出对话框，以便在表格中增加支票项*/
    InvoicePanel invoice = new InvoicePanel();
    if (JOptionPane.showOptionDialog(parent, invoice, "New Invoice Item",
                                     JOptionPane.OK_CANCEL_OPTION,
                                     JOptionPane.QUESTION_MESSAGE,
                                     null, null, null) ==
        JOptionPane.YES_OPTION) {
      try {
        parent.data.addRow(invoice.getData());
        parent.price.setText("Total Price: ￥" + parent.total());
      }
      catch (NumberFormatException nfe) {
        JOptionPane.showMessageDialog(parent, "Invalid numeric format",
                                      "Error Message",
                                      JOptionPane.ERROR_MESSAGE);
      }
    }
  }

  private void modify() {
    /*弹出包含一个发票项的对话框，进行编辑。*/
    InvoicePanel invoice = new InvoicePanel();
    int row = parent.table.getSelectedRow();
    if (row >= 0) {
      String data[] = new String[4];
      for (int i = 0; i < data.length; i++) {
        data[i] = parent.data.getValueAt(row, i).toString();
      }
      invoice.setData(data);
      if (JOptionPane.showOptionDialog(parent, invoice, "Change Item",
                                       JOptionPane.OK_CANCEL_OPTION,
                                       JOptionPane.WARNING_MESSAGE,
                                       null, null, null) ==
          JOptionPane.YES_OPTION) {
        try {
          for (int i = 0; i < invoice.getData().length; i++) {
            parent.data.setValueAt(invoice.getData()[i], row, i);
          }
          parent.price.setText("Total Price: ￥" + parent.total());
        }
        catch (NumberFormatException nfe) {
          JOptionPane.showMessageDialog(parent, "Invalid number",
                                        "Error Message",
                                        JOptionPane.ERROR_MESSAGE);
        }
      }
    }
  }
}