package com.paul.ui;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.BorderFactory;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.KeyStroke;
import javax.swing.ScrollPaneConstants;
import javax.swing.SwingConstants;
@Named
public class JNotePadUI
extends JFrame {
private static final long serialVersionUID = -7584732501149961175L;
private JMenuItem menuOpen;
private JMenuItem menuSave;
private JMenuItem menuSaveAs;
private JMenuItem menuClose;
private JMenuItem menuCut;
private JMenuItem menuCopy;
private JMenuItem menuPaste;
private JMenuItem menuAbout;
private JTextArea textArea;
private JMenu editMenu;
private JPopupMenu popUpMenu;
private JLabel stateBar;
private JFileChooser fileChooser;
public JNotePadUI() {
super("新增文字檔案");
setUpUIComponent();
setUpEventListener();
setVisible(
true);
}
private void setUpUIComponent() {
setSize(640, 480);
// 選單列
JMenuBar menuBar =
new JMenuBar();
// 設置「檔案」選單
JMenu fileMenu =
new JMenu("檔案");
menuOpen =
new JMenuItem("開啟舊檔");
// 快速鍵設置
menuOpen.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,
InputEvent.CTRL_MASK));
menuSave =
new JMenuItem("儲存檔案");
menuSave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,
InputEvent.CTRL_MASK));
menuSaveAs =
new JMenuItem("另存新檔");
menuClose =
new JMenuItem("關閉");
menuClose.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q,
InputEvent.CTRL_MASK));
fileMenu.add(menuOpen);
fileMenu.addSeparator();
// 分隔線
fileMenu.add(menuSave);
fileMenu.add(menuSaveAs);
fileMenu.addSeparator();
// 分隔線
fileMenu.add(menuClose);
// 設置「編輯」選單
editMenu =
new JMenu("編輯");
menuCut =
new JMenuItem("剪下");
menuCut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,
InputEvent.CTRL_MASK));
menuCopy =
new JMenuItem("複製");
menuCopy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,
InputEvent.CTRL_MASK));
menuPaste =
new JMenuItem("貼上");
menuPaste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,
InputEvent.CTRL_MASK));
editMenu.add(menuCut);
editMenu.add(menuCopy);
editMenu.add(menuPaste);
// 設置「關於」選單
JMenu aboutMenu =
new JMenu("關於");
menuAbout =
new JMenuItem("關於 JNotePad");
aboutMenu.add(menuAbout);
menuBar.add(fileMenu);
menuBar.add(editMenu);
menuBar.add(aboutMenu);
// 設置選單列
setJMenuBar(menuBar);
// 文字編輯區域
textArea =
new JTextArea();
textArea.setFont(
new Font("細明體", Font.PLAIN, 16));
textArea.setLineWrap(
true);
JScrollPane panel =
new JScrollPane(textArea,
ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
Container contentPane = getContentPane();
contentPane.add(panel, BorderLayout.CENTER);
// 狀態列
stateBar =
new JLabel("未修改");
stateBar.setHorizontalAlignment(SwingConstants.LEFT);
stateBar.setBorder(BorderFactory.createEtchedBorder());
contentPane.add(stateBar, BorderLayout.SOUTH);
popUpMenu = editMenu.getPopupMenu();
fileChooser =
new JFileChooser();
}
private void setUpEventListener() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// 按下視窗關閉鈕事件處理
addWindowListener(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
closeFile();
}
});
// 選單 - 開啟舊檔
menuOpen.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
openFile();
}
});
// 選單 - 儲存檔案
menuSave.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
saveFile();
}
});
// 選單 - 另存新檔
menuSaveAs.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
saveFileAs();
}
});
// 選單 - 關閉檔案
menuClose.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
closeFile();
}
});
// 選單 - 剪下
menuCut.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
cut();
}
});
// 選單 - 複製
menuCopy.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
copy();
}
});
// 選單 - 貼上
menuPaste.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
paste();
}
});
// 選單 - 關於
menuAbout.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
// 顯示對話方塊
JOptionPane.showOptionDialog(
null, "程式名稱:\n JNotePad \n"
+ "程式設計:\n 良葛格\n" + "簡介:\n 一個簡單的文字編輯器\n"
+ " 可作為驗收 Java的實作對象\n" + " 歡迎網友下載研究交流\n\n"
+ "http://caterpillar.onlyfun.net/", "關於 JNotePad",
JOptionPane.DEFAULT_OPTION,
JOptionPane.INFORMATION_MESSAGE,
null,
null,
null);
}
});
// 編輯區鍵盤事件
textArea.addKeyListener(
new KeyAdapter() {
public void keyTyped(KeyEvent e) {
processTextArea();
}
});
// 編輯區滑鼠事件
textArea.addMouseListener(
new MouseAdapter() {
public void mouseReleased(MouseEvent e) {
if (e.getButton() == MouseEvent.BUTTON3)
popUpMenu.show(editMenu, e.getX(), e.getY());
}
public void mouseClicked(MouseEvent e) {
if (e.getButton() == MouseEvent.BUTTON1)
popUpMenu.setVisible(
false);
}
});
}
private void openFile() {
if (isCurrentFileSaved()) {
// 文件是否為儲存狀態
open();
// 開啟舊檔
}
else {
// 顯示對話方塊
int option = JOptionPane.showConfirmDialog(
null, "檔案已修改，是否儲存？",
"儲存檔案？", JOptionPane.YES_NO_OPTION,
JOptionPane.WARNING_MESSAGE,
null);
switch (option) {
// 確認檔案儲存
case JOptionPane.YES_OPTION:
saveFile();
// 儲存檔案
break;
// 放棄檔案儲存
case JOptionPane.NO_OPTION:
open();
break;
}
}
}
private void open() {
// fileChooser 是 JFileChooser 的實例
// 顯示檔案選取的對話方塊
int option = fileChooser.showDialog(
null,
null);
// 使用者按下確認鍵
if (option == JFileChooser.APPROVE_OPTION) {
try {
// 開啟選取的檔案
BufferedReader buf =
new BufferedReader(
new FileReader(
fileChooser.getSelectedFile()));
// 設定文件標題
setTitle(fileChooser.getSelectedFile().toString());
// 清除前一次文件
textArea.setText("");
// 設定狀態列
stateBar.setText("未修改");
// 取得系統相依的換行字元
String lineSeparator = System.getProperty("line.separator");
// 讀取檔案並附加至文字編輯區
String text;
while ((text = buf.readLine()) !=
null) {
textArea.append(text);
textArea.append(lineSeparator);
}
buf.close();
}
catch (IOException e) {
JOptionPane.showMessageDialog(
null, e.toString(), "開啟檔案失敗",
JOptionPane.ERROR_MESSAGE);
}
}
}
private boolean isCurrentFileSaved() {
if (stateBar.getText().equals("未修改")) {
return false;
}
else {
return true;
}
}
private void saveFile() {
// 從標題列取得檔案名稱
File file =
new File(getTitle());
// 若指定的檔案不存在
if (!file.exists()) {
// 執行另存新檔
saveFileAs();
}
else {
try {
// 開啟指定的檔案
BufferedWriter buf =
new BufferedWriter(
new FileWriter(file));
// 將文字編輯區的文字寫入檔案
buf.write(textArea.getText());
buf.close();
// 設定狀態列為未修改
stateBar.setText("未修改");
}
catch (IOException e) {
JOptionPane.showMessageDialog(
null, e.toString(), "寫入檔案失敗",
JOptionPane.ERROR_MESSAGE);
}
}
}
private void saveFileAs() {
// 顯示檔案對話方塊
int option = fileChooser.showDialog(
null,
null);
// 如果確認選取檔案
if (option == JFileChooser.APPROVE_OPTION) {
// 取得選擇的檔案
File file = fileChooser.getSelectedFile();
// 在標題列上設定檔案名稱
setTitle(file.toString());
try {
// 建立檔案
file.createNewFile();
// 進行檔案儲存
saveFile();
}
catch (IOException e) {
JOptionPane.showMessageDialog(
null, e.toString(), "無法建立新檔",
JOptionPane.ERROR_MESSAGE);
}
}
}
private void closeFile() {
// 是否已儲存文件19-36
if (isCurrentFileSaved()) {
// 釋放視窗資源，而後關閉程式
dispose();
}
else {
int option = JOptionPane.showConfirmDialog(
null, "檔案已修改，是否儲存？",
"儲存檔案？", JOptionPane.YES_NO_OPTION,
JOptionPane.WARNING_MESSAGE,
null);
switch (option) {
case JOptionPane.YES_OPTION:
saveFile();
break;
case JOptionPane.NO_OPTION:
dispose();
}
}
}
private void cut() {
textArea.cut();
stateBar.setText("已修改");
popUpMenu.setVisible(
false);
}
private void copy() {
textArea.copy();
popUpMenu.setVisible(
false);
}
private void paste() {
textArea.paste();
stateBar.setText("已修改");
popUpMenu.setVisible(
false);
}
private void processTextArea() {
stateBar.setText("已修改");
}
public static void main(String[] args) {
new JNotePadUI();
}
}