import java.io.*; import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.text.*; /** * This program lets the user edit RTF text files in a window. When a * file is being edited, the name of the file is displayed in the window's * title bar. RTF text can include "styles" such as bold and italics. * This class can be run as a standalone application. * * Note that the program can open files that were saved from the program, * but can't open arbitrary text files correctly. It should be able to open * standard RTF files. */ public class SimpleRTFEdit extends JFrame { /** * The main program just opens a window belonging to this SimpleRTFEdit class. * Then the window takes care of itself until the program is ended with the * Quit command or when the user closes the window. */ public static void main(String[] args) { JFrame window = new SimpleRTFEdit(); window.setVisible(true); } private JEditorPane editPane; // Holds the text that is being edited in the window. private JFileChooser fileDialog; // File dialog for use in doOpen() and doSave(). private File editFile; // The file, if any that is currently being edited. /** * Create a SimpleRTFEdit window, with an edit pane where the user can * edit some text and with a menu bar. The content type for the text * files that are edited by this program is "text/rtf". */ public SimpleRTFEdit() { super("SimpleRTFEdit: Untitled"); // Specifies title of the window. editPane = new JEditorPane("text/rtf",""); editPane.setMargin( new Insets(3,5,0,0) ); // Some space around the text. JScrollPane scroller = new JScrollPane(editPane); setContentPane(scroller); setDefaultCloseOperation(EXIT_ON_CLOSE); setJMenuBar( makeMenus() ); setSize(600,500); setLocation(50,50); } /** * Create and return a menu bar containing a File menu and an Edit * menu. The File menu contains four commands, New, Open, Save, * and Quit. The commands in the Edit menu are standard editing * actions defined in the classes DefaultEditorKit and * StyledEditorKit. */ private JMenuBar makeMenus() { ActionListener listener = new ActionListener() { // An object that will serve as listener for File menu items. public void actionPerformed(ActionEvent evt) { // This will be called when the user makes a selection // from the File menu. This routine just checks // which command was selected and calls another // routine to carry out the command. String cmd = evt.getActionCommand(); if (cmd.equals("New")) doNew(); else if (cmd.equals("Open...")) doOpen(); else if (cmd.equals("Save...")) doSave(); else if (cmd.equals("Quit")) doQuit(); } }; JMenuBar bar = new JMenuBar(); JMenu fileMenu = new JMenu("File"); JMenuItem newCmd = new JMenuItem("New"); newCmd.setAccelerator(makeAccelerator("N")); newCmd.addActionListener(listener); fileMenu.add(newCmd); JMenuItem openCmd = new JMenuItem("Open..."); openCmd.setAccelerator(makeAccelerator("O")); openCmd.addActionListener(listener); fileMenu.add(openCmd); JMenuItem saveCmd = new JMenuItem("Save..."); saveCmd.setAccelerator(makeAccelerator("S")); saveCmd.addActionListener(listener); fileMenu.add(saveCmd); fileMenu.addSeparator(); JMenuItem quitCmd = new JMenuItem("Quit"); newCmd.setAccelerator(makeAccelerator("Q")); quitCmd.addActionListener(listener); fileMenu.add(quitCmd); bar.add(fileMenu); JMenu editMenu = new JMenu("Edit"); Action cutAction = new DefaultEditorKit.CutAction(); cutAction.putValue(Action.NAME, "Cut"); cutAction.putValue(Action.ACCELERATOR_KEY, makeAccelerator("X")); editMenu.add(cutAction); Action copyAction = new DefaultEditorKit.CopyAction(); copyAction.putValue(Action.NAME, "Copy"); copyAction.putValue(Action.ACCELERATOR_KEY, makeAccelerator("C")); editMenu.add(copyAction); Action pasteAction = new DefaultEditorKit.PasteAction(); pasteAction.putValue(Action.NAME, "Paste"); pasteAction.putValue(Action.ACCELERATOR_KEY, makeAccelerator("V")); editMenu.add(pasteAction); editMenu.addSeparator(); Action boldAction = new StyledEditorKit.BoldAction(); boldAction.putValue(Action.NAME, "Bold"); boldAction.putValue(Action.ACCELERATOR_KEY, makeAccelerator("B")); editMenu.add(boldAction); Action italicAction = new StyledEditorKit.ItalicAction(); italicAction.putValue(Action.NAME, "Italic"); italicAction.putValue(Action.ACCELERATOR_KEY, makeAccelerator("I")); editMenu.add(italicAction); Action underlineAction = new StyledEditorKit.UnderlineAction(); underlineAction.putValue(Action.NAME, "Underlined"); underlineAction.putValue(Action.ACCELERATOR_KEY, makeAccelerator("U")); editMenu.add(underlineAction); bar.add(editMenu); return bar; } // end makeMenus() /** * Create a KeyStroke that uses the meta key on Mac OS and * the control key on other operating systems. * @param description a string that describes the keystroke, * without the "meta" or "ctrl"; for example, "S" or * "shift Z" or "alt F1" * @return a keystroke created from the description string * with either "ctrl " or "meta " prepended */ private static KeyStroke makeAccelerator(String description) { String commandKey; if ( System.getProperty("mrj.version") == null ) commandKey = "ctrl"; else commandKey = "meta"; return KeyStroke.getKeyStroke( commandKey + " " + description ); } /** * Carry out the "New" command from the File menu by clearing all * the text from the JTextArea. Also sets the title bar of the * window to read "SimpleRTFEdit: Untitled". */ private void doNew() { editPane.setText(""); editFile = null; setTitle("SimpleRTFEdit: Untitled"); } /** * Carry out the Save command by letting the user specify an output file * and writing the text from the JTextArea to that file. */ private void doSave() { if (fileDialog == null) fileDialog = new JFileChooser(); File selectedFile; //Initially selected file name in the dialog. if (editFile == null) selectedFile = new File("filename.rtf"); else selectedFile = new File(editFile.getName()); fileDialog.setSelectedFile(selectedFile); fileDialog.setDialogTitle("Select File to be Saved"); int option = fileDialog.showSaveDialog(this); if (option != JFileChooser.APPROVE_OPTION) return; // User canceled or clicked the dialog's close box. selectedFile = fileDialog.getSelectedFile(); if (selectedFile.exists()) { // Ask the user whether to replace the file. int response = JOptionPane.showConfirmDialog( this, "The file \"" + selectedFile.getName() + "\" already exists.\nDo you want to replace it?", "Confirm Save", JOptionPane.YES_NO_OPTION, JOptionPane.WARNING_MESSAGE ); if (response != JOptionPane.YES_OPTION) return; // User does not want to replace the file. } OutputStream out; try { out = new FileOutputStream(selectedFile); } catch (Exception e) { JOptionPane.showMessageDialog(this, "Sorry, but an error occurred while trying to open the file:\n" + e); return; } try { Document doc = editPane.getDocument(); editPane.getEditorKit().write(out,doc,0,doc.getLength()); editFile = selectedFile; setTitle("SimpleRTFEdit: " + editFile.getName()); } catch (Exception e) { JOptionPane.showMessageDialog(this, "Sorry, but an error occurred while trying to write the text:\n" + e); } } /** * Carry out the Open command by letting the user specify a file to be opened * and reading up to 10000 characters from that file. If the file is read * successfully and is not too long, then the text from the file replaces the * text in the JTextArea. */ public void doOpen() { if (fileDialog == null) fileDialog = new JFileChooser(); fileDialog.setDialogTitle("Select File to be Opened"); fileDialog.setSelectedFile(null); // No file is initially selected. int option = fileDialog.showOpenDialog(this); if (option != JFileChooser.APPROVE_OPTION) return; // User canceled or clicked the dialog's close box. File selectedFile = fileDialog.getSelectedFile(); InputStream in; try { in = new FileInputStream(selectedFile); } catch (Exception e) { JOptionPane.showMessageDialog(this, "Sorry, but an error occurred while trying to open the file:\n" + e); return; } try { Document doc = new DefaultStyledDocument(); editPane.getEditorKit().read(in,doc,0); in.close(); editPane.setDocument(doc); editFile = selectedFile; setTitle("SimpleRTFEdit: " + editFile.getName()); } catch (Exception e) { JOptionPane.showMessageDialog(this, "Sorry, but an error occurred while trying to read the data:\n" + e); } } /** * Carry out the Quit command by exiting the program. */ private void doQuit() { System.exit(0); } } // end class SimpleRTFEdit