[vc_row][vc_column width=”1/1″][vc_column_text]This post shows a simple text editor created with Java on pcDuino.[/vc_column_text][vc_tour][vc_tab title=”The resulting Text Editor” tab_id=”1395292933-1-67″][vc_column_text]The designed text editor:
[/vc_column_text][/vc_tab][vc_tab title=”Source code” tab_id=”1395292933-2-18″][vc_column_text]
import java.awt *.;
import java.awt.event *.;
import java.io. *;
public class Notepad / * implements ActionListener, MouseListener, MouseMotionListener, WindowListener, ItemListener, KeyListener, TextListener * /
{
/ / Member variables
private Frame mainFrame ;/ / main frame
private MenuBar mb; / / menu bar
private Menu mFile, mEdit, mFormat, mHelp; / / menus : File, Edit , format, help
private MenuItem miNew, miOpen, miSave, miSaveAs, miExit ;/ / File menu items: New, Open, Save , Save As , Exit
private MenuItem miCut, miCopy, miPaste, miDelete ;/ / Edit menu item : cut, copy , paste, delete
private MenuItem miFont, miLowtoCapital, miCapitaltoLow, miEncrypt, miDisencrypt ;/ / Format menu items : Fonts
private MenuItem miAboutNotepad ;/ / Help menu item : About Notepad
private TextArea ta ;/ / text area
String private String tempString ;/ / temporary string , copy and paste the need for storage
private boolean textValueChanged = false;
private int id_font ;/ / fonts
String fileName = "" ;/ / last saved the file name and address
/ / Constructor
public Notepad () {
/ / Frame
mainFrame = new Frame ("Notepad v0.99 by Launching");
mb = new MenuBar ();
ta = new TextArea (30, 60);
ta.setFont (new Font ("Times New Rome", Font.PLAIN, 15));
ta.setBackground (new Color (0, 250, 200));
/ / Menu bar
mFile = new Menu (" File" ) ;
mEdit = new Menu (" Edit" ) ;
mFormat = new Menu (" format t");
mHelp = new Menu (" Help " ) ;
/ / " File"
miNew = new MenuItem (" New" ) ;
miOpen = new MenuItem (" Open" ) ;
miSave = new MenuItem (" Save" ) ;
miSaveAs = new MenuItem (" Save As" ) ;
miExit = new MenuItem (" Exit" ) ;
/ / " Edit"
miCut = new MenuItem (" Cut" ) ;
miCopy = new MenuItem (" Copy" ) ;
miPaste = new MenuItem (" Paste" ) ;
miDelete = new MenuItem (" Delete" ) ;
/ / " Format "
miFont = new MenuItem ("Font");
miLowtoCapital = new MenuItem ("Low to Capital");
miCapitaltoLow = new MenuItem ("Capital to Low");
miEncrypt = new MenuItem ("Encrypt");
miDisencrypt = new MenuItem ("Disencrypt");
/ / "Help"
miAboutNotepad = new MenuItem (" About Notepad");
/ / Add File menu item
mFile.add (miNew);
mFile.add (miOpen);
mFile.add (miSave);
mFile.add (miSaveAs);
mFile.add (miExit);
/ / Add the Edit menu items
mEdit.add (miCut);
mEdit.add (miCopy);
mEdit.add (miPaste);
mEdit.add (miDelete);
/ / Add formatting menu items
mFormat.add (miFont);
mFormat.add (miLowtoCapital);
mFormat.add (miCapitaltoLow);
mFormat.add (miEncrypt);
mFormat.add (miDisencrypt);
/ / Add the Help menu item
mHelp.add (miAboutNotepad);
/ / Add menu menu bar
mb.add (mFile);
mb.add (mEdit);
mb.add (mFormat);
mb.add (mHelp);
/ / Add menu bar frame
mainFrame.setMenuBar (mb);
/ / Assign the initial string is empty
tempString = "";
/ / Add text area
mainFrame.add (ta, BorderLayout.CENTER);
mainFrame.setSize (800, 500);
mainFrame.setLocation (100, 100) ;/ / start position
mainFrame.setResizable (true) ;/ / can not change the size
mainFrame.setVisible (true);
/ / mainFrame.pack ();
/ / / / / / / / / / / / / / / / / / / / / / / / / Increase the monitor / / / / / / / / / / / / / / / / / / / / / /
/ / Main frame
mainFrame.addWindowListener (new WindowAdapter () {/ / Close the window
public void windowClosing (WindowEvent e) {
System.exit (0);
}
} ) ;
/ / Text area
ta.addKeyListener (new KeyAdapter () {
public void KeyTyped (KeyEvent e) {
textValueChanged = true; / / keyboard button that causes the text to modify
}
} ) ;
/ / / / / / / / / / / / / / / / " File" menu :/ / / / / / / / / / / / / / / / / / / / / /
/ / New
miNew.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent e) {
ta.replaceRange ("", 0, ta.getText (). length ()) content ;/ / empty text area
fileName = "" ;/ / file name cleared
}
} ) ;
/ / Open
miOpen.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent e) {
FileDialog d = new FileDialog (mainFrame, "open file", FileDialog.LOAD) ;/ / open file dialog
d.addWindowListener (new WindowAdapter () {/ / Close the file dialog window
public void windowClosing (WindowEvent ee) {
System.exit (0);
}
} ) ;
d.setVisible (true);
File f = new File (d.getDirectory () + d.getFile ()); / / Create a new document
fileName = d.getDirectory () + d.getFile () ;/ / get the file name
char ch [] = new char [(int) f.length ()] ;/ / / This file is used to establish the length of an array of characters
try / / exception handling
{
/ / Read and stored in the character array ch
BufferedReader bw = new BufferedReader (new FileReader (f));
bw.read (ch);
bw.close ();
}
catch (FileNotFoundException fe) {
System.out.println ("file not found");
System.exit (0);
}
catch (IOException ie) {
System.out.println ("IO error");
System.exit (0);
}
String s = new String (ch);
ta.setText (s) ;/ / set the text area to open the file contents
}
} ) ;
/ / Save
miSave.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent e) {
if (fileName.equals ("")) {/ / If the file is not saved , that file name is empty
FileDialog d = new FileDialog (mainFrame, "save file", FileDialog.SAVE) ;/ / save file dialog
d.addWindowListener (new WindowAdapter () {/ / Close the file dialog window
public void windowClosing (WindowEvent ee) {
System.exit (0);
}
} ) ;
d.setVisible (true);
String s = ta.getText () ;/ / get the input text
try / / exception handling
{
File f = new File (d.getDirectory () + d.getFile ()) ;/ / New File
fileName = d.getDirectory () + d.getFile () ;/ / get the file name
BufferedWriter bw = new BufferedWriter (new FileWriter (f)) ;/ / input to a file
bw.write (s, 0, s.length ());
bw.close ();
}
catch (FileNotFoundException fe_) {
System.out.println ("file not found");
System.exit (0);
}
catch (IOException ie_)
{
System.out.println ("IO error");
System.exit (0);
}
}
else / / If the file has been saved
{
String s = ta.getText () ;/ / get the input text
try / / exception handling
{
File f = new File (fileName) ;/ / New File
BufferedWriter bw = new BufferedWriter (new FileWriter (f)) ;/ / input to a file
bw.write (s, 0, s.length ());
bw.close ();
}
catch (FileNotFoundException fe_) {
System.out.println ("file not found");
System.exit (0);
}
catch (IOException ie_)
{
System.out.println ("IO error");
System.exit (0);
}
}
}
} ) ;
/ / Save as
miSaveAs.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent e) {
FileDialog d = new FileDialog (mainFrame, "save file", FileDialog.SAVE) ;/ / save file dialog
d.addWindowListener (new WindowAdapter () {/ / Close the file dialog window
public void windowClosing (WindowEvent ee) {
System.exit (0);
}
} ) ;
d.setVisible (true);
String s = ta.getText () ;/ / get the input text
try / / exception handling
{
File f = new File (d.getDirectory () + d.getFile ()) ;/ / New File
BufferedWriter bw = new BufferedWriter (new FileWriter (f)) ;/ / input to a file
bw.write (s, 0, s.length ());
bw.close ();
}
catch (FileNotFoundException fe_) {
System.out.println ("file not found");
System.exit (0);
}
catch (IOException ie_)
{
System.out.println ("IO error");
System.exit (0);
}
}
} ) ;
/ / Exit
miExit.addActionListener (new ActionListener () {/ / / exit the program
public void actionPerformed (ActionEvent e) {
System.exit (0);
}
} ) ;
/ / / / / / / / / / / / / / / / " Edit" menu :/ / / / / / / / / / / / / / / / / / / /
/ / Cut
miCut.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent e) {
tempString = ta.getSelectedText (); / / / get the content you want to copy , temporary storage in the tempString
StringBuffer tmp = new StringBuffer (ta.getText ()) ;/ / temporary storage of text
int start = ta.getSelectionStart (); starting position / / get the string to be deleted
int len = ta.getSelectedText () length ();. / / get the length of the string to be deleted
tmp.delete (start, start + len); / / / delete the selected string
ta.setText (tmp.toString ()) ;/ / set the original text with new text
}
} ) ;
/ / Copy
miCopy.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent e) {
tempString = ta.getSelectedText (); / / / get the content you want to copy , temporary storage in the tempString
}
} ) ;
/ / Paste
miPaste.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent e) {
StringBuffer tmp = new StringBuffer (ta.getText ()) ;/ / temporary storage of text
int start = ta.getSelectionStart (); / / get the position you want to paste
tmp.insert (start, tempString) ;/ / check the contents to be pasted into the
ta.setText (tmp.toString ()) ;/ / set the original text with new text
}
} ) ;
/ / Delete
miDelete.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent e) {
StringBuffer tmp = new StringBuffer (ta.getText ()) ;/ / temporary storage of text
int start = ta.getSelectionStart (); starting position / / get the string to be deleted
int len = ta.getSelectedText () length ();. / / get the length of the string to be deleted
tmp.delete (start, start + len); / / / delete the selected string
ta.setText (tmp.toString ()) ;/ / set the original text with new text
}
} ) ;
/ / / / / / / / / / / / / / / / " Format" menu :/ / / / / / / / / / / / / / / / / / / /
/ / Fonts
miFont.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent e) {
final Dialog d = new Dialog (mainFrame, "Font") ;/ / New dialog box
d.setLocation (250, 250) ;/ / start position
d.setLayout (new BorderLayout ()) ;/ / table layout
/ / / / / / / / / / / / / / / / / / / / / / / / / / Upper part of the panel
Label l_font = new Label ("font") ;/ / font tag
Panel p_1 = new Panel ();
p_1.add (l_font);
p_1.setVisible (true);
/ / / / / / / / / / / / / / / / / / / / / / / / / / Part of the panel
List font_list = new List (6, false) ;/ / font list
/ / Add font project
font_list.add ("Plain") ;/ / / normal font
font_list.add ("Bold"); / / / Bold
font_list.add ("Italic") ;/ / italic
font_list.addItemListener (new MyItemListener_font ()); / / font increase Monitors
Panel p_2 = new Panel ();
p_2.add (font_list);
p_2.setVisible (true);
/ / / / / / / / / / / / / / / / / / / / / / / / / / Lower part of the panel
Button ok = new Button ("OK");
ok.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent e) {
d.dispose ();
}
} ) ;
ok.setSize (new Dimension (20, 5));
Panel p_3 = new Panel () ;/ / lower part of the panel
p_3.add (ok);
p_3.setVisible (true);
/ / Add three panels
d.add (p_1, BorderLayout.NORTH);
d.add (p_2, BorderLayout.CENTER);
d.add (p_3, BorderLayout.SOUTH);
d.pack ();
d.addWindowListener (new WindowAdapter () {/ / Close the dialog window
public void windowClosing (WindowEvent ee) {
d.dispose ();
}
} ) ;
d.setVisible (true);
}
} ) ;
/ / Turn uppercase lowercase letters
miLowtoCapital.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent e) {
String s = ta.getText () ;/ / get the input text
StringBuffer temp = new StringBuffer ("");
for (int i = 0; i <s.length (); i + +) {
if ((int) s.charAt (i)> = 97 && (int) s.charAt (i) <= 122) {
temp.append ((char) ((int) s.charAt (i) -32));
}
else
temp.append (s.charAt (i));
}
s = new String (temp);
ta.setText (s);
}
} ) ;
/ / Turn uppercase lowercase
miCapitaltoLow.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent e) {
String s = ta.getText () ;/ / get the input text
StringBuffer temp = new StringBuffer ("");
for (int i = 0; i <s.length (); i + +) {
if ((int) s.charAt (i)> = 65 && (int) s.charAt (i) <= 90) {
temp.append ((char) ((int) s.charAt (i) +32));
}
else
temp.append (s.charAt (i));
}
s = new String (temp);
ta.setText (s);
}
} ) ;
/ / Encryption
miEncrypt.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent e) {
String s = ta.getText () ;/ / get the input text
StringBuffer temp = new StringBuffer ("");
for (int i = 0; i <s.length (); i + +) {
if (s.charAt (i)> = 40 && s.charAt (i) <= 125) {
if (i% 2 == 0) {
temp.append ((char) (s.charAt (i) + 1));
}
else
temp.append ((char) (s.charAt (i) - 1));
}
else
temp.append (s.charAt (i));
}
s = new String (temp);
ta.setText (s);
}
} ) ;
/ / Decryption
miDisencrypt.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent e) {
String s = ta.getText () ;/ / get the input text
StringBuffer temp = new StringBuffer ("");
for (int i = 0; i <s.length (); i + +) {
if (s.charAt (i)> = 40 && s.charAt (i) <= 125) {
if (i% 2 == 0) {
temp.append ((char) (s.charAt (i) - 1));
}
else
temp.append ((char) (s.charAt (i) + 1));
}
else
temp.append (s.charAt (i));
}
s = new String (temp);
ta.setText (s);
}
} ) ;
/ / / / / / / / / / / / / / / / " Help" menu :/ / / / / / / / / / / / / / / / / / / /
/ / About notepad
miAboutNotepad.addActionListener (new ActionListener () {
public void actionPerformed (ActionEvent e) {
final Dialog d = new Dialog (mainFrame, "AboutNotepad") ;/ / New dialog box
TextArea t = new TextArea ("\ nwelcome to use Notepad" + "\ n \ n" + "Copyright @ Launching" + "\ n \ n" + "free software" + "\ n \ n" + "v0.99 " ) ;/ / add tags
t.setSize (new Dimension (5, 5));
t.setEditable (false);
d.setResizable (false) ;/ / non-resizable
d.add (t);
d.pack ();
d.addWindowListener (new WindowAdapter () {/ / Close the dialog window
public void windowClosing (WindowEvent ee) {
d.dispose ();
}
} ) ;
d.setLocation (100, 250) ;/ / start position
d.setVisible (true);
}
} ) ;
}
class MyItemListener_font implements ItemListener {/ / font Listener
public void itemStateChanged (ItemEvent e) {
id_font = ((java.awt.List) e.getSource ()) getSelectedIndex ().;
switch (id_font) {
case 0: {
ta.setFont (new Font ("Times New Roman", Font.PLAIN, ta.getFont (). getSize ())) ;/ / normal text
break;
}
case 1: {
ta.setFont (new Font ("Times New Roman", Font.BOLD, ta.getFont (). getSize ())) ;/ / bold text
break;
}
case 2: {
ta.setFont (new Font ("Times New Roman", Font.ITALIC, ta.getFont (). getSize ())) ;/ / italic text
break;
}
}
}
}
/ / / / / / / / / / / / / / / / / / / / / / Main function / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /
public static void main (String arg []) {
Notepad test = new Notepad (); / / / Create a notepad
}
/ / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /
}
[/vc_column_text][/vc_tab][/vc_tour][/vc_column][/vc_row]
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