Description: This program creates a simple Text Editor.
Primary Inputs: ——
Primary Output: Text Editor
Platform Used: JDK 1.5 or higher.
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/*save file as "editor.java"*/ import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.io.*; import javax.swing.text.*; import java.text.*; import java.util.*; import javax.swing.undo.*; import javax.swing.event.*; import java.net.*; public class editor extends JFrame { // ALL THE VARIABLES USED IN THIS APPLICATION JTextArea area = new JTextArea(0, 0); JScrollPane scroller = new JScrollPane(area); public JPopupMenu pop = new JPopupMenu(); JMenu menu = new JMenu("Edit"); JMenuItem menuItem = new JMenuItem("copy"); JMenuItem menucut = new JMenuItem("cut"); JMenuItem menuclear = new JMenuItem("clear"); JMenuItem menupaste = new JMenuItem("paste"); JToolBar toolBar = new JToolBar(); JButton newFile = new JButton(new ImageIcon("new.jpg")); JButton openFile = new JButton(new ImageIcon("open.jpg")); JButton saveFile = new JButton(new ImageIcon("save.jpg")); JButton cutFile = new JButton(new ImageIcon("cut.jpg")); JButton copyFile = new JButton(new ImageIcon("copy.jpg")); JButton pasteFile = new JButton(new ImageIcon("paste.jpg")); JMenuBar menuBar = new JMenuBar(); JMenu FILE = new JMenu("File"); JMenu EDIT = new JMenu("Edit"); JMenuItem NEWFILE = new JMenuItem("New", new ImageIcon("new.jpg")); JMenuItem OPENFILE = new JMenuItem("Open", new ImageIcon("open.jpg")); JMenuItem SAVEFILE = new JMenuItem("Save", new ImageIcon("save.jpg")); JMenuItem SAVEASFILE = new JMenuItem("Save As..."); JMenuItem EXITFILE = new JMenuItem("Exit"); JMenuItem COPYEDIT = new JMenuItem("copy"); JMenuItem CUTEDIT = new JMenuItem("cut"); JMenuItem PASTEDIT = new JMenuItem("paste"); JMenuItem DELETEDIT = new JMenuItem("Delete"); JMenuItem FINDEDIT = new JMenuItem("Find"); JMenuItem FINDNEXTEDIT = new JMenuItem("Find Next"); JMenuItem GOTOEDIT = new JMenuItem("Go To"); JMenuItem SELECTEDIT = new JMenuItem("Select All"); JMenuItem TIMEDIT = new JMenuItem("Time/Date"); String file = null; String fileN; boolean opened = false; JPanel statusPanel = new JPanel(); JLabel statusLabel; JPanel aboutPanel = new JPanel(); int ind = 0; StringBuffer sbufer; String findString; public editor() { // DEFAULT TITLE OF FRAME super("untitled"); // SETS THE SIZE this.setSize(800, 600); // SETS THE LAYOUT this.getContentPane().setLayout(new BorderLayout()); // SETS WORD WRAP TO TRUE AS DEFAULT area.setLineWrap(true); // SETS FOCUS ON THE TEXTAREA area.requestFocus(true); // ADDS THE SCROLLPANE CONTAINING THE TEXTAREA TO THE CONTAINER this.getContentPane().add(scroller, BorderLayout.CENTER); // ADDS THE STATUSPANEL this.getContentPane().add(statusPanel, BorderLayout.SOUTH); // TO ENABLE DRAG MODE area.setDragEnabled(true); // SETS THE TOOLBAR TO BE STATIC I.E DISALLOW THE USER FROM CHANGING THE // DOCKING POSITION toolBar.setFloatable(false); // ADD THE TOOLBAR this.getContentPane().add(toolBar, BorderLayout.NORTH); // ADD A MOUSELISTENER TO RIGHT CLICK FOR THE POPUPLISTENER MouseListener popupListener = new PopupListener(); area.addMouseListener(popupListener); // SETS THE MENUBAR FILE.add(NEWFILE); FILE.add(OPENFILE); FILE.add(SAVEFILE); FILE.add(SAVEASFILE); FILE.addSeparator(); FILE.addSeparator(); FILE.add(EXITFILE); EDIT.add(CUTEDIT); EDIT.add(COPYEDIT); EDIT.add(PASTEDIT); EDIT.add(DELETEDIT); EDIT.addSeparator(); EDIT.add(FINDEDIT); EDIT.add(FINDNEXTEDIT); EDIT.add(GOTOEDIT); EDIT.addSeparator(); EDIT.add(SELECTEDIT); EDIT.add(TIMEDIT); FILE.setMnemonic(KeyEvent.VK_F); menuBar.add(FILE); EDIT.setMnemonic(KeyEvent.VK_E); menuBar.add(EDIT); // ADD MENUBAR TO THE FRAME this.setJMenuBar(menuBar); // ADD ITEMS TO THE POPUP pop.addSeparator(); pop.add(menuItem); pop.add(menucut); pop.add(menupaste); pop.add(menuclear); // VALIDATION newFile.setBorder(null); openFile.setBorder(null); saveFile.setBorder(null); cutFile.setBorder(null); copyFile.setBorder(null); pasteFile.setBorder(null); // ADD TO TOOLBAR toolBar.add(newFile); newFile.setToolTipText("New file"); toolBar.addSeparator(); toolBar.add(openFile); openFile.setToolTipText("Open file"); toolBar.add(saveFile); saveFile.setToolTipText("Save file"); toolBar.addSeparator(); toolBar.add(cutFile); cutFile.setToolTipText("Cut"); toolBar.add(copyFile); copyFile.setToolTipText("Copy"); toolBar.add(pasteFile); pasteFile.setToolTipText("Paste"); // ACTION FOR NEW FILE ON THE TOOLBAR newFile.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { opened = false; if (area.getText().equals("")) { System.out.print("text is empty"); } else { int confirm = JOptionPane.showConfirmDialog(null, "Would you like to save?", "New File", JOptionPane.YES_NO_CANCEL_OPTION); if (confirm == JOptionPane.YES_OPTION) { saveFile(); area.setText(null); statusPanel.removeAll(); statusPanel.validate(); } else if (confirm == JOptionPane.CANCEL_OPTION) { } else if (confirm == JOptionPane.NO_OPTION) { area.setText(null); statusPanel.removeAll(); statusPanel.validate(); } } } }); // //OPEN BUTTON ON THE TOOLBAR openFile.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { openFile(); } }); // //SAVE BUTTON ON THE TOOLBAR saveFile.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { saveFile(); } }); // ACTION FOR CUT BUTTON ON THE TOOLBAR cutFile.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { area.cut(); } }); // ACTION FOR COPY BUTTON ON THE TOOLBAR copyFile.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { area.copy(); } }); // ACTION FOR PASTE BUTTON ON THE TOOLBAR pasteFile.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { area.paste(); } }); // ACTIONLISTENER FOR OTHER ITEMS ON THE TOOLBAR // COPY BUTTON ON THE TOOLBAR menuItem.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { area.copy(); menupaste.setEnabled(true); pasteFile.setEnabled(true); PASTEDIT.setEnabled(true); } }); // CUT BUTTON ON THE TOOLBAR menucut.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { area.cut(); menupaste.setEnabled(true); pasteFile.setEnabled(true); PASTEDIT.setEnabled(true); } }); // PASTE BUTTON ON THE TOOLBAR menupaste.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { area.paste(); } }); // CLEAR BUTTON ON THE TOOLBAR menuclear.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { area.setText(null); } }); // ACTIONLISTENER FOR ITEMS IN THE MENUBAR // OPEN A NEW FILE NEWFILE.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, ActionEvent.CTRL_MASK)); NEWFILE.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { opened = false; int confirm = JOptionPane.showConfirmDialog(null, "Would you like to save?", "New File", JOptionPane.YES_NO_CANCEL_OPTION); if (confirm == JOptionPane.YES_OPTION) { saveFile(); area.setText(null); statusPanel.removeAll(); statusPanel.validate(); } else if (confirm == JOptionPane.CANCEL_OPTION) { } else { area.setText(null); statusPanel.removeAll(); statusPanel.validate(); } } }); // SAVE OPTION. HAS A VALIDATION CHECK THAT CHECKS WETHER ITS AN OPENED // FILE OR NEW FILE SAVEFILE.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, ActionEvent.CTRL_MASK)); SAVEFILE.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { saveFile(); } }); // OPTION THAT WILL BRING UP A DIALOG WHICH SAVES THE FILE WITH A NAME // AND FORMAT DESIRED SAVEASFILE.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { opened = false; saveFile(); } }); SELECTEDIT.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, ActionEvent.CTRL_MASK)); SELECTEDIT.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { area.selectAll(); } }); // ACTION FOR OPEN BUTTON OPENFILE.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, ActionEvent.CTRL_MASK)); OPENFILE.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { openFile(); } }); // ACTION FOR CUT BUTTON CUTEDIT.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, ActionEvent.CTRL_MASK)); CUTEDIT.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { area.cut(); } }); // ACTION FOR COPY BUTTON COPYEDIT.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C, ActionEvent.CTRL_MASK)); COPYEDIT.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { area.copy(); } }); // ACTION FOR PASTE BUTTON PASTEDIT.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V, ActionEvent.CTRL_MASK)); PASTEDIT.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { area.paste(); } }); // FONT SELECTOR OPTION // PRINTS THE SYSTEM DATE AND TIME IN THE EDITOR TIMEDIT.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { Date currentDate; SimpleDateFormat formatter; String dd; formatter = new SimpleDateFormat("KK:mm aa MMMMMMMMM dd yyyy", Locale.getDefault()); currentDate = new java.util.Date(); dd = formatter.format(currentDate); area.insert(dd, area.getCaretPosition()); } }); // FINDS A WORD IN THE EDITOR FINDEDIT.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { try { sbufer = new StringBuffer(area.getText()); findString = JOptionPane.showInputDialog(null, "Find"); ind = sbufer.indexOf(findString); area.setCaretPosition(ind); area.setSelectionStart(ind); area.setSelectionEnd(ind + findString.length()); } catch (IllegalArgumentException npe) { JOptionPane.showMessageDialog(null, "String not found"); } catch (NullPointerException nfe) { } } }); // FINDS A WORD IN THE EDITOR FINDNEXTEDIT.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { try { sbufer = new StringBuffer(area.getText()); findString = JOptionPane.showInputDialog(null, "Find"); ind = sbufer.indexOf(findString, area.getCaretPosition()); area.setCaretPosition(ind); area.setSelectionStart(ind); area.setSelectionEnd(ind + findString.length()); } catch (IllegalArgumentException npe) { JOptionPane.showMessageDialog(null, "String not found"); } catch (NullPointerException nfe) { } } }); // EXITS THE APPLICATION AND CHECKS FOR ANY CHANGES MADE EXITFILE.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_E, ActionEvent.CTRL_MASK)); EXITFILE.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { int confirm = JOptionPane.showConfirmDialog(null, "Would you like to save?", "Exit Application", JOptionPane.YES_NO_CANCEL_OPTION); if (confirm == JOptionPane.YES_OPTION) { saveFile(); dispose(); System.exit(0); } else if (confirm == JOptionPane.CANCEL_OPTION) { } else { dispose(); System.exit(0); } } }); // ACTION FOR GO TO OPTION GOTOEDIT.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { try { Element root = area.getDocument().getDefaultRootElement(); Element paragraph = root.getElement(Integer .parseInt(JOptionPane.showInputDialog(null, "Go to line"))); area.setCaretPosition(paragraph.getStartOffset() - 1); } catch (NullPointerException npe) { JOptionPane.showMessageDialog(null, "Invalid line number"); } catch (NumberFormatException nfe) { } } }); // ACTION FOR DELETE OPTION DELETEDIT.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { area.replaceSelection(null); } }); // CLOSES THE WINDOW WHEN THE CLOSE BUTTON IS PRESSED addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { int confirm = JOptionPane.showConfirmDialog(null, "Would you like to save?", "Exit Application", JOptionPane.YES_NO_CANCEL_OPTION); if (confirm == JOptionPane.YES_OPTION) { saveFile(); dispose(); System.exit(0); } else if (confirm == JOptionPane.CANCEL_OPTION) { } else { dispose(); System.exit(0); } } }); } // MAIN FUNCTION. public static void main(String args[]) { editor l = new editor(); l.setVisible(true); } // FUNCTION CALLED BY THE SAVE BUTTON public void saveFile() { String line = area.getText(); if (opened == true) { try { FileWriter output = new FileWriter(file); BufferedWriter bufout = new BufferedWriter(output); bufout.write(line, 0, line.length()); JOptionPane.showMessageDialog(null, "Save Successful"); bufout.close(); output.close(); } catch (IOException ioe) { ioe.printStackTrace(); } } else { JFileChooser fc = new JFileChooser(); int result = fc.showSaveDialog(new JPanel()); if (result == JFileChooser.APPROVE_OPTION) { fileN = String.valueOf(fc.getSelectedFile()); try { FileWriter output = new FileWriter(fileN); BufferedWriter bufout = new BufferedWriter(output); bufout.write(line, 0, line.length()); JOptionPane.showMessageDialog(null, "Save Successful"); bufout.close(); output.close(); opened = true; } catch (IOException ioe) { ioe.printStackTrace(); } } } } // FUNCTION TO OPEN THE FILE public void openFile() { statusPanel.removeAll(); statusPanel.validate(); area.setText(null); JFileChooser fc = new JFileChooser(); int result = fc.showOpenDialog(new JPanel()); if (result == JFileChooser.APPROVE_OPTION) { String file = String.valueOf(fc.getSelectedFile()); // String dirn = fc.getDirectory(); File fil = new File(file); newFile.setEnabled(false); // START THIS THREAD WHILE READING FILE Thread loader = new FileLoader(fil, area.getDocument()); loader.start(); statusPanel.removeAll(); statusPanel.revalidate(); } else { } } // CLASS FOR THE MOUSELIsTENER class PopupListener extends MouseAdapter { public void mousePressed(MouseEvent e) { maybeShowPopup(e); } public void mouseReleased(MouseEvent e) { maybeShowPopup(e); } private void maybeShowPopup(MouseEvent e) { if (e.isPopupTrigger()) { pop.show(e.getComponent(), e.getX(), e.getY()); } } } /*** Thread to load a file into the text storage model */ class FileLoader extends Thread { JLabel state; FileLoader(File f, Document doc) { setPriority(4); this.f = f; this.doc = doc; } public void run() { try { // initialize the statusbar statusPanel.removeAll(); JProgressBar progress = new JProgressBar(); progress.setMinimum(0); progress.setMaximum((int) f.length()); statusPanel.add(new JLabel("opened so far ")); statusPanel.add(progress); statusPanel.revalidate(); // try to start reading Reader in = new FileReader(f); char[] buff = new char[4096]; int nch; while ((nch = in.read(buff, 0, buff.length)) != -1) { doc.insertString(doc.getLength(), new String(buff, 0, nch), null); progress.setValue(progress.getValue() + nch); } // we are done... get rid of progressbar statusPanel.removeAll(); statusPanel.revalidate(); } catch (IOException e) { System.err.println(e.toString()); } catch (BadLocationException e) { System.err.println(e.getMessage()); } newFile.setEnabled(true); } Document doc; File f; } // END MAIN CLASS } |