texteditorframe.java

这是有我个人开发的Java版文本编辑器。

package texteditor;

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.borland.dbswing.*;
import javax.swing.text.*;
import javax.swing.event.*;

/**
 * <p>Title: Text Editor</p>
 * <p>Description: This is a Java text editor developed with Borland JBuilder X.</p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: bearStudio.com</p>
 * @author bear golden
 * @version 1.0
 */

public class TextEditorFrame
    extends JFrame
{
  IntlSwingSupport intlSwingSupport = new IntlSwingSupport(); // Internationalizing Swing component
  JPanel contentPane;
  JMenuBar jMenuBar1 = new JMenuBar();
  JMenu jMenuFile = new JMenu();
  JMenuItem jMenuFileExit = new JMenuItem();
  JMenu jMenuHelp = new JMenu();
  JMenuItem jMenuHelpAbout = new JMenuItem();
  JToolBar jToolBar = new JToolBar();
  JButton jButtonOpenFile = new JButton();
  JButton jButtonCloseFile = new JButton();
  JButton jButtonHelp = new JButton();
  ImageIcon image1;
  ImageIcon image2;
  ImageIcon image3;
  JLabel statusBar = new JLabel();
  BorderLayout borderLayout1 = new BorderLayout();
  JScrollPane scrollPane = new JScrollPane();
  JTextArea jTextArea = new JTextArea();
  JMenuItem jMenuFileNew = new JMenuItem();
  JMenuItem jMenuFileOpen = new JMenuItem();
  JMenuItem jMenuFileSave = new JMenuItem();
  JMenuItem jMenuFileSaveAs = new JMenuItem();
  JMenu jMenuEdit = new JMenu();
  JMenuItem jMenuEditFont = new JMenuItem();
  JMenuItem jMenuEditForeColor = new JMenuItem();
  JMenuItem jMenuEditBackColor = new JMenuItem();
  FontChooser jFontChooser = new FontChooser();
  JFileChooser jFileChooser = new JFileChooser();
  String currentFileName = null; // Full path and filename, null means new/untitled.
  boolean dirty = false; // false means the file was not modified initially.
  Document document;
  DBTextDataBinder dBTextDataBinder1 = new DBTextDataBinder();

  //Construct the frame
  public TextEditorFrame()
  {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try
    {
      jbInit();
      updateCaption();
    }
    catch (Exception e)
    {
      e.printStackTrace();
    }
  }

  //Component initialization
  private void jbInit()
      throws Exception
  {
    image1 = new ImageIcon(texteditor.TextEditorFrame.class.getResource(
        "openFile.png"));
    image2 = new ImageIcon(texteditor.TextEditorFrame.class.getResource(
        "closeFile.png"));
    image3 = new ImageIcon(texteditor.TextEditorFrame.class.getResource(
        "help.png"));
    contentPane = (JPanel)this.getContentPane();
    document = jTextArea.getDocument();
    contentPane.setLayout(borderLayout1);
    this.setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
    this.setSize(new Dimension(400, 300));
    this.setTitle("Text Editor");
    statusBar.setText(" ");
    jMenuFile.setText("File");
    jMenuFileExit.setText("Exit");
    jMenuFileExit.addActionListener(new
                                    TextEditorFrame_jMenuFileExit_ActionAdapter(this));
    jMenuHelp.setText("Help");
    jMenuHelpAbout.setText("About");
    jMenuHelpAbout.addActionListener(new
                                     TextEditorFrame_jMenuHelpAbout_ActionAdapter(this));
    jButtonOpenFile.setIcon(image1);
    jButtonOpenFile.addActionListener(new TextEditorFrame_jButtonOpenFile_actionAdapter(this));
    jButtonOpenFile.setToolTipText("Open File");
    jButtonCloseFile.setIcon(image2);
    jButtonCloseFile.addActionListener(new TextEditorFrame_jButtonCloseFile_actionAdapter(this));
    jButtonCloseFile.setToolTipText("Close File");
    jButtonHelp.setIcon(image3);
    jButtonHelp.addActionListener(new TextEditorFrame_jButtonHelp_actionAdapter(this));
    jButtonHelp.setToolTipText("Help");
    jTextArea.setLineWrap(true);
    jTextArea.setWrapStyleWord(true);
    jMenuFileNew.setText("New");
    jMenuFileNew.addActionListener(new TextEditorFrame_jMenuFileNew_actionAdapter(this));
    jMenuFileOpen.setText("Open ...");
    jMenuFileOpen.addActionListener(new TextEditorFrame_jMenuFileOpen_actionAdapter(this));
    jMenuFileSave.setText("Save");
    jMenuFileSave.addActionListener(new TextEditorFrame_jMenuFileSave_actionAdapter(this));
    jMenuFileSaveAs.setText("Save as ...");
    jMenuFileSaveAs.addActionListener(new TextEditorFrame_jMenuFileSaveAs_actionAdapter(this));
    jMenuEdit.setText("Edit");
    jMenuEditFont.setText("Font ...");
    jMenuEditFont.addActionListener(new TextEditorFrame_jMenuEditFont_actionAdapter(this));
    jMenuEditForeColor.setText("Foreground Color ...");
    jMenuEditForeColor.addActionListener(new TextEditorFrame_jMenuEditForeColor_actionAdapter(this));
    jMenuEditBackColor.setText("Background Color ...");
    jMenuEditBackColor.addActionListener(new TextEditorFrame_jMenuEditBackColor_actionAdapter(this));
    jFontChooser.setFrame(this);
    jFontChooser.setTitle("Font");
    jFontChooser.setSampleText("Sample Text");
    document.addDocumentListener(new TextEditorFrame_document_documentAdapter(this));
    dBTextDataBinder1.setJTextComponent(jTextArea);
    dBTextDataBinder1.setEnableFileLoading(false);
    dBTextDataBinder1.setEnableFileSaving(false);
    jToolBar.add(jButtonOpenFile);
    jToolBar.add(jButtonCloseFile);
    jToolBar.add(jButtonHelp);
    jMenuFile.add(jMenuFileNew);
    jMenuFile.add(jMenuFileOpen);
    jMenuFile.add(jMenuFileSave);
    jMenuFile.add(jMenuFileSaveAs);
    jMenuFile.addSeparator();
    jMenuFile.add(jMenuFileExit);
    jMenuHelp.add(jMenuHelpAbout);
    jMenuBar1.add(jMenuFile);
    jMenuBar1.add(jMenuEdit);
    jMenuBar1.add(jMenuHelp);
    this.setJMenuBar(jMenuBar1);
    contentPane.add(jToolBar, BorderLayout.NORTH);
    contentPane.add(statusBar, BorderLayout.SOUTH);
    contentPane.add(scrollPane, BorderLayout.CENTER);
    scrollPane.getViewport().add(jTextArea, null);
    jMenuEdit.add(jMenuEditFont);
    jMenuEdit.add(jMenuEditForeColor);
    jMenuEdit.add(jMenuEditBackColor);
  }

  // Display the About box.
  void helpAbout()
  {
    TextEditorFrame_AboutBox dlg = new TextEditorFrame_AboutBox(this);
    Dimension dlgSize = dlg.getPreferredSize();
    Dimension frmSize = getSize();
    Point loc = getLocation();
    dlg.setLocation( (frmSize.width - dlgSize.width) / 2 + loc.x,
                    (frmSize.height - dlgSize.height) / 2 + loc.y);
    dlg.setModal(true);
    dlg.pack();
    dlg.show();
  }

  // Handle the File|Open menu or button, invoking
  // okToAbandon and openFile as needed.
  void fileOpen()
  {
    // Handle the File|Open menu item.
    if (!okToAbandon())
      return;

// Use the OPEN version of the dialog, test return for Approve/Cancel
    if (JFileChooser.APPROVE_OPTION == jFileChooser.showOpenDialog(this))
    {
      // Call openFile() method to attempt to load the text from file into JTextArea
      openFile(jFileChooser.getSelectedFile().getPath());

      //repaints menu after item is selected
      this.repaint();
    }

  }

  // the implementation of openFile() method
  // Open named file; read text from file into jTextArea1; report to statusBar.
  void openFile(String fileName)
  {
    try
    {
      // Open a file of the given name.
      File file = new File(fileName);

      // Get the size of the opened file.
      int size = (int) file.length();

      // Set to zero a counter for counting the number of
      // characters that have been read from the file.
      int chars_read = 0;

      // Create an input reader based on the file, so we can read its data.
      // FileReader handles international character encoding conversions.
      FileReader in = new FileReader(file);

      // Create a character array of the size of the file,
      // to use as a data buffer, into which we will read the text data.
      char[] data = new char[size];

      // Read all available characters into the buffer.
      while (in.ready())
      {
        // Increment the count for each character read,
        // and accumulate them in the data buffer.
        chars_read += in.read(data, chars_read, size - chars_read);
      }

      in.close();

      // Create a temporary string containing the data,
      // and set the string into the JTextArea.
      jTextArea.setText(new String(data, 0, chars_read));

      // Cache the currently opened filename for use at save time...
      this.currentFileName = fileName;
      // ...and mark the edit session as being clean
      this.dirty = false;

      // Display the name of the opened directory + file in the statusBar.
      statusBar.setText("Opened " + fileName);

      updateCaption();
    }

    catch (IOException e)
    {
      statusBar.setText("Error opening " + fileName);
    }
  }

  // the implementation of saveFile() method
  // Save current file; handle not yet having a filename; report to statusBar.
  boolean saveFile()
  {
    // Handle the case where we don't have a file name yet.
    if (currentFileName == null)
    {
      return saveAsFile();
    }

    try
    {
      // Open a file of the current name.
      File file = new File(currentFileName);

      // Create an output writer that will write to that file.
      // FileWriter handles international characters encoding conversions.
      FileWriter out = new FileWriter(file);
      String text = jTextArea.getText();
      out.write(text);
      out.close();
      this.dirty = false;

      // Display the name of the saved directory+file in the statusBar.
      statusBar.setText("Saved to " + currentFileName);
      updateCaption();
      return true;
    }

    catch (IOException e)
    {
      statusBar.setText("Error saving " + currentFileName);
    }

    return false;
  }

  // the implementation of saveAsFile() method
  // Save current file, asking user for new destination name.
  // Report to statusBar.
  boolean saveAsFile()
  {
    // Use the SAVE version of the dialog, test return for Approve/Cancel
    if (JFileChooser.APPROVE_OPTION == jFileChooser.showSaveDialog(this))
    {
      // Set the current file name to the user's selection,
      // then do a regular saveFile
      currentFileName = jFileChooser.getSelectedFile().getPath();

      //repaints menu after item is selected
      this.repaint();
      return saveFile();
    }

    else
    {
      this.repaint();
      return false;
    }
  }

  // Check if file is dirty.
  // (when a file has been modified since the last save, it's called a dirty file,)
  // If so, prompt for save/don't save/cancel save decision.
  boolean okToAbandon()
  {
    if (!dirty)
      return true;

    int value = JOptionPane.showConfirmDialog(this, "Save changes?", "Text Editor",
                                              JOptionPane.YES_NO_CANCEL_OPTION);

    switch (value)
    {
      case JOptionPane.YES_OPTION:

        // Yes, please save changes
        return saveFile();

      case JOptionPane.NO_OPTION:

        // No, abandon edits; that is, return true without saving
        return true;

      case JOptionPane.CANCEL_OPTION:

      default:

        // Cancel the dialog without saving or closing
        return false;
    }
  }

  // Update the title bar of the application to show the filename and its dirty state.
  void updateCaption()
  {
    String caption;

    if (currentFileName == null)
    {
      // synthesize the "Untitled" name if no name yet.
      caption = "Untitled";
    }
    else
    {
      caption = currentFileName;
    }

    // add a "* " in the caption if the file is dirty.
    if (dirty)
    {
      caption += " *";
    }
    caption += " - Text Editor";
    this.setTitle(caption);
  }

  //File | Exit action performed
  public void jMenuFileExit_actionPerformed(ActionEvent e)
  {
    if (okToAbandon())
      System.exit(0);
  }

  //Help | About action performed
  public void jMenuHelpAbout_actionPerformed(ActionEvent e)