My Life with Java & Salesforce........ By Bhupender Dagar: Example of Notepad

1. import java.io.*;

2. import java.util.Date;

3. import java.awt.*;

4. import java.awt.event.*;

5. import javax.swing.*;

6. import javax.swing.event.*;

8. /************************************/

9. class FileOperation

10. {

11. Notepad npd;

12.

13. boolean saved;

14. boolean newFileFlag;

15. String fileName;

16. String applicationTitle="Javapad";

17.

18. File fileRef;

19. JFileChooser chooser;

20. /////////////////////////////

21. boolean isSave(){return saved;}

22. void setSave(boolean saved){this.saved=saved;}

23. String getFileName(){return new String(fileName);}

24. void setFileName(String fileName){this.fileName=new String(fileName);}

25. /////////////////////////

26. FileOperation(Notepad npd)

27. {

28. this.npd=npd;

29.

30. saved=true;

31. newFileFlag=true;

32. fileName=new String("Untitled");

33. fileRef=new File(fileName);

34. this.npd.f.setTitle(fileName+" - "+applicationTitle);

35.

36. chooser=new JFileChooser();

37. chooser.addChoosableFileFilter(new MyFileFilter(".java","Java Source Files(*.java)"));

38. chooser.addChoosableFileFilter(new MyFileFilter(".txt","Text Files(*.txt)"));

39. chooser.setCurrentDirectory(new File("."));

40.

41. }

42. //////////////////////////////////////

43.

44. boolean saveFile(File temp)

45. {

46. FileWriter fout=null;

47. try

48. {

49. fout=new FileWriter(temp);

50. fout.write(npd.ta.getText());

51. }

52. catch(IOException ioe){updateStatus(temp,false);return false;}

53. finally

54. {try{fout.close();}catch(IOException excp){}}

55. updateStatus(temp,true);

56. return true;

57. }

58. ////////////////////////

59. boolean saveThisFile()

60. {

61.

62. if(!newFileFlag)

63. {return saveFile(fileRef);}

64.

65. return saveAsFile();

66. }

67. ////////////////////////////////////

68. boolean saveAsFile()

69. {

70. File temp=null;

71. chooser.setDialogTitle("Save As...");

72. chooser.setApproveButtonText("Save Now");

73. chooser.setApproveButtonMnemonic(KeyEvent.VK_S);

74. chooser.setApproveButtonToolTipText("Click me to save!");

75.

76. do

77. {

78. if(chooser.showSaveDialog(this.npd.f)!=JFileChooser.APPROVE_OPTION)

79. return false;

80. temp=chooser.getSelectedFile();

81. if(!temp.exists()) break;

82. if( JOptionPane.showConfirmDialog(

83. this.npd.f,"<html>"+temp.getPath()+" already exists.<br>Do you want to replace it?<html>",

84. "Save As",JOptionPane.YES_NO_OPTION

85. )==JOptionPane.YES_OPTION)

86. break;

87. }while(true);

88.

89.

90. return saveFile(temp);

91. }

92.

93. ////////////////////////

94. boolean openFile(File temp)

95. {

96. FileInputStream fin=null;

97. BufferedReader din=null;

98.

99. try

100. {

101. fin=new FileInputStream(temp);

102. din=new BufferedReader(new InputStreamReader(fin));

103. String str=" ";

104. while(str!=null)

105. {

106. str=din.readLine();

107. if(str==null)

108. break;

109. this.npd.ta.append(str+"\n");

110. }

111.

112. }

113. catch(IOException ioe){updateStatus(temp,false);return false;}

114. finally

115. {try{din.close();fin.close();}catch(IOException excp){}}

116. updateStatus(temp,true);

117. this.npd.ta.setCaretPosition(0);

118. return true;

119. }

120. ///////////////////////

121. void openFile()

122. {

123. if(!confirmSave()) return;

124. chooser.setDialogTitle("Open File...");

125. chooser.setApproveButtonText("Open this");

126. chooser.setApproveButtonMnemonic(KeyEvent.VK_O);

127. chooser.setApproveButtonToolTipText("Click me to open the selected file.!");

128.

129. File temp=null;

130. do

131. {

132. if(chooser.showOpenDialog(this.npd.f)!=JFileChooser.APPROVE_OPTION)

133. return;

134. temp=chooser.getSelectedFile();

135.

136. if(temp.exists()) break;

137.

138. JOptionPane.showMessageDialog(this.npd.f,

139. "<html>"+temp.getName()+"<br>file not found.<br>"+

140. "Please verify the correct file name was given.<html>",

141. "Open", JOptionPane.INFORMATION_MESSAGE);

142.

143. } while(true);

144.

145. this.npd.ta.setText("");

146.

147. if(!openFile(temp))

148. {

149. fileName="Untitled"; saved=true;

150. this.npd.f.setTitle(fileName+" - "+applicationTitle);

151. }

152. if(!temp.canWrite())

153. newFileFlag=true;

154.

155. }

156. ////////////////////////

157. void updateStatus(File temp,boolean saved)

158. {

159. if(saved)

160. {

161. this.saved=true;

162. fileName=new String(temp.getName());

163. if(!temp.canWrite())

164. {fileName+="(Read only)"; newFileFlag=true;}

165. fileRef=temp;

166. npd.f.setTitle(fileName + " - "+applicationTitle);

167. npd.statusBar.setText("File : "+temp.getPath()+" saved/opened successfully.");

168. newFileFlag=false;

169. }

170. else

171. {

172. npd.statusBar.setText("Failed to save/open : "+temp.getPath());

173. }

174. }

175. ///////////////////////

176. boolean confirmSave()

177. {

178. String strMsg="<html>The text in the "+fileName+" file has been changed.<br>"+

179. "Do you want to save the changes?<html>";

180. if(!saved)

181. {

182. int x=JOptionPane.showConfirmDialog(this.npd.f,strMsg,applicationTitle,

183. JOptionPane.YES_NO_CANCEL_OPTION);

184.

185. if(x==JOptionPane.CANCEL_OPTION) return false;

186. if(x==JOptionPane.YES_OPTION && !saveAsFile()) return false;

187. }

188. return true;

189. }

190. ///////////////////////////////////////

191. void newFile()

192. {

193. if(!confirmSave()) return;

194.

195. this.npd.ta.setText("");

196. fileName=new String("Untitled");

197. fileRef=new File(fileName);

198. saved=true;

199. newFileFlag=true;

200. this.npd.f.setTitle(fileName+" - "+applicationTitle);

201. }

202. //////////////////////////////////////

203. }// end defination of class FileOperation

204. /************************************/

205. public class Notepad implements ActionListener, MenuConstants

206. {

207.

208. JFrame f;

209. JTextArea ta;

210. JLabel statusBar;

211.

212. private String fileName="Untitled";

213. private boolean saved=true;

214. String applicationName="Javapad";

215.

216. String searchString, replaceString;

217. int lastSearchIndex;

218.

219. FileOperation fileHandler;

220. FontChooser fontDialog=null;

221. FindDialog findReplaceDialog=null;

222. JColorChooser bcolorChooser=null;

223. JColorChooser fcolorChooser=null;

224. JDialog backgroundDialog=null;

225. JDialog foregroundDialog=null;

226. JMenuItem cutItem,copyItem, deleteItem, findItem, findNextItem,

227. replaceItem, gotoItem, selectAllItem;

228. /****************************/

229. Notepad()

230. {

231. f=new JFrame(fileName+" - "+applicationName);

232. ta=new JTextArea(30,60);

233. statusBar=new JLabel("|| Ln 1, Col 1 ",JLabel.RIGHT);

234. f.add(new JScrollPane(ta),BorderLayout.CENTER);

235. f.add(statusBar,BorderLayout.SOUTH);

236. f.add(new JLabel(" "),BorderLayout.EAST);

237. f.add(new JLabel(" "),BorderLayout.WEST);

238. createMenuBar(f);

239. //f.setSize(350,350);

240. f.pack();

241. f.setLocation(100,50);

242. f.setVisible(true);

243. f.setLocation(150,50);

244. f.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

245.

246. fileHandler=new FileOperation(this);

247.

248. /////////////////////

249.

250. ta.addCaretListener(

251. new CaretListener()

252. {

253. public void caretUpdate(CaretEvent e)

254. {

255. int lineNumber=0, column=0, pos=0;

256.

257. try

258. {

259. pos=ta.getCaretPosition();

260. lineNumber=ta.getLineOfOffset(pos);

261. column=pos-ta.getLineStartOffset(lineNumber);

262. }catch(Exception excp){}

263. if(ta.getText().length()==0){lineNumber=0; column=0;}

264. statusBar.setText("|| Ln "+(lineNumber+1)+", Col "+(column+1));

265. }

266. });

267. //////////////////

268. DocumentListener myListener = new DocumentListener()

269. {

270. public void changedUpdate(DocumentEvent e){fileHandler.saved=false;}

271. public void removeUpdate(DocumentEvent e){fileHandler.saved=false;}

272. public void insertUpdate(DocumentEvent e){fileHandler.saved=false;}

273. };

274. ta.getDocument().addDocumentListener(myListener);

275. /////////

276. WindowListener frameClose=new WindowAdapter()

277. {

278. public void windowClosing(WindowEvent we)

279. {

280. if(fileHandler.confirmSave())System.exit(0);

281. }

282. };

283. f.addWindowListener(frameClose);

284. //////////////////

285. /*

286. ta.append("Hello dear hello hi");

287. ta.append("\nwho are u dear mister hello");

288. ta.append("\nhello bye hel");

289. ta.append("\nHello");

290. ta.append("\nMiss u mister hello hell");

291. fileHandler.saved=true;

292. */

293. }

294. ////////////////////////////////////

295. void goTo()

296. {

297. int lineNumber=0;

298. try

299. {

300. lineNumber=ta.getLineOfOffset(ta.getCaretPosition())+1;

301. String tempStr=JOptionPane.showInputDialog(f,"Enter Line Number:",""+lineNumber);

302. if(tempStr==null)

303. {return;}

304. lineNumber=Integer.parseInt(tempStr);

305. ta.setCaretPosition(ta.getLineStartOffset(lineNumber-1));

306. }catch(Exception e){}

307. }

308. ///////////////////////////////////

309. public void actionPerformed(ActionEvent ev)

310. {

311. String cmdText=ev.getActionCommand();

312. ////////////////////////////////////

313. if(cmdText.equals(fileNew))

314. fileHandler.newFile();

315. else if(cmdText.equals(fileOpen))

316. fileHandler.openFile();

317. ////////////////////////////////////

318. else if(cmdText.equals(fileSave))

319. fileHandler.saveThisFile();

320. ////////////////////////////////////

321. else if(cmdText.equals(fileSaveAs))

322. fileHandler.saveAsFile();

323. ////////////////////////////////////

324. else if(cmdText.equals(fileExit))

325. {if(fileHandler.confirmSave())System.exit(0);}

326. ////////////////////////////////////

327. else if(cmdText.equals(filePrint))

328. JOptionPane.showMessageDialog(

329. Notepad.this.f,

330. "Get ur printer repaired first! It seems u dont have one!",

331. "Bad Printer",

332. JOptionPane.INFORMATION_MESSAGE

333. );

334. ////////////////////////////////////

335. else if(cmdText.equals(editCut))

336. ta.cut();

337. ////////////////////////////////////

338. else if(cmdText.equals(editCopy))

339. ta.copy();

340. ////////////////////////////////////

341. else if(cmdText.equals(editPaste))

342. ta.paste();

343. ////////////////////////////////////

344. else if(cmdText.equals(editDelete))

345. ta.replaceSelection("");

346. ////////////////////////////////////

347. else if(cmdText.equals(editFind))

348. {

349. if(Notepad.this.ta.getText().length()==0)

350. return; // text box have no text

351. if(findReplaceDialog==null)

352. findReplaceDialog=new FindDialog(Notepad.this.ta);

353. findReplaceDialog.showDialog(Notepad.this.f,true);//find

354. }

355. ////////////////////////////////////

356. else if(cmdText.equals(editFindNext))

357. {

358. if(Notepad.this.ta.getText().length()==0)

359. return; // text box have no text

360.

361. if(findReplaceDialog==null)

362. statusBar.setText("Use Find option of Edit Menu first !!!!");

363. else

364. findReplaceDialog.findNextWithSelection();

365. }

366. ////////////////////////////////////

367. else if(cmdText.equals(editReplace))

368. {

369. if(Notepad.this.ta.getText().length()==0)

370. return; // text box have no text

371.

372. if(findReplaceDialog==null)

373. findReplaceDialog=new FindDialog(Notepad.this.ta);

374. findReplaceDialog.showDialog(Notepad.this.f,false);//replace

375. }

376. ////////////////////////////////////

377. else if(cmdText.equals(editGoTo))

378. {

379. if(Notepad.this.ta.getText().length()==0)

380. return; // text box have no text

381. goTo();

382. }

383. ////////////////////////////////////

384. else if(cmdText.equals(editSelectAll))

385. ta.selectAll();

386. ////////////////////////////////////

387. else if(cmdText.equals(editTimeDate))

388. ta.insert(new Date().toString(),ta.getSelectionStart());

389. ////////////////////////////////////

390. else if(cmdText.equals(formatWordWrap))

391. {

392. JCheckBoxMenuItem temp=(JCheckBoxMenuItem)ev.getSource();

393. ta.setLineWrap(temp.isSelected());

394. }

395. ////////////////////////////////////

396. else if(cmdText.equals(formatFont))

397. {

398. if(fontDialog==null)

399. fontDialog=new FontChooser(ta.getFont());

400.

401. if(fontDialog.showDialog(Notepad.this.f,"Choose a font"))

402. Notepad.this.ta.setFont(fontDialog.createFont());

403. }

404. ////////////////////////////////////

405. else if(cmdText.equals(formatForeground))

406. showForegroundColorDialog();

407. ////////////////////////////////////

408. else if(cmdText.equals(formatBackground))

409. showBackgroundColorDialog();

410. ////////////////////////////////////

411.

412. else if(cmdText.equals(viewStatusBar))

413. {

414. JCheckBoxMenuItem temp=(JCheckBoxMenuItem)ev.getSource();

415. statusBar.setVisible(temp.isSelected());

416. }

417. ////////////////////////////////////

418. else if(cmdText.equals(helpAboutNotepad))

419. {

420. JOptionPane.showMessageDialog(Notepad.this.f,aboutText,"Dedicated 2 u!",

421. JOptionPane.INFORMATION_MESSAGE);

422. }

423. else

424. statusBar.setText("This "+cmdText+" command is yet to be implemented");

425. }//action Performed

426. ////////////////////////////////////

427. void showBackgroundColorDialog()

428. {

429. if(bcolorChooser==null)

430. bcolorChooser=new JColorChooser();

431. if(backgroundDialog==null)

432. backgroundDialog=JColorChooser.createDialog

433. (Notepad.this.f,

434. formatBackground,

435. false,

436. bcolorChooser,

437. new ActionListener()

438. {public void actionPerformed(ActionEvent evvv){

439. Notepad.this.ta.setBackground(bcolorChooser.getColor());}},

440. null);

441.

442. backgroundDialog.setVisible(true);

443. }

444. ////////////////////////////////////

445. void showForegroundColorDialog()

446. {

447. if(fcolorChooser==null)

448. fcolorChooser=new JColorChooser();

449. if(foregroundDialog==null)

450. foregroundDialog=JColorChooser.createDialog

451. (Notepad.this.f,

452. formatForeground,

453. false,

454. fcolorChooser,

455. new ActionListener()

456. {public void actionPerformed(ActionEvent evvv){

457. Notepad.this.ta.setForeground(fcolorChooser.getColor());}},

458. null);

459.

460. foregroundDialog.setVisible(true);

461. }

462.

463. ///////////////////////////////////

464. JMenuItem createMenuItem(String s, int key,JMenu toMenu,ActionListener al)

465. {

466. JMenuItem temp=new JMenuItem(s,key);

467. temp.addActionListener(al);

468. toMenu.add(temp);

469.

470. return temp;

471. }

472. ////////////////////////////////////

473. JMenuItem createMenuItem(String s, int key,JMenu toMenu,int aclKey,ActionListener al)

474. {

475. JMenuItem temp=new JMenuItem(s,key);

476. temp.addActionListener(al);

477. temp.setAccelerator(KeyStroke.getKeyStroke(aclKey,ActionEvent.CTRL_MASK));

478. toMenu.add(temp);

479.

480. return temp;

481. }

482. ////////////////////////////////////

483. JCheckBoxMenuItem createCheckBoxMenuItem(String s,

484. int key,JMenu toMenu,ActionListener al)

485. {

486. JCheckBoxMenuItem temp=new JCheckBoxMenuItem(s);

487. temp.setMnemonic(key);

488. temp.addActionListener(al);

489. temp.setSelected(false);

490. toMenu.add(temp);

491.

492. return temp;

493. }

494. ////////////////////////////////////

495. JMenu createMenu(String s,int key,JMenuBar toMenuBar)

496. {

497. JMenu temp=new JMenu(s);

498. temp.setMnemonic(key);

499. toMenuBar.add(temp);

500. return temp;

501. }

502. /*********************************/

503. void createMenuBar(JFrame f)

504. {

505. JMenuBar mb=new JMenuBar();

506. JMenuItem temp;

507.

508. JMenu fileMenu=createMenu(fileText,KeyEvent.VK_F,mb);

509. JMenu editMenu=createMenu(editText,KeyEvent.VK_E,mb);

510. JMenu formatMenu=createMenu(formatText,KeyEvent.VK_O,mb);

511. JMenu viewMenu=createMenu(viewText,KeyEvent.VK_V,mb);

512. JMenu helpMenu=createMenu(helpText,KeyEvent.VK_H,mb);

513.

514. createMenuItem(fileNew,KeyEvent.VK_N,fileMenu,KeyEvent.VK_N,this);

515. createMenuItem(fileOpen,KeyEvent.VK_O,fileMenu,KeyEvent.VK_O,this);

516. createMenuItem(fileSave,KeyEvent.VK_S,fileMenu,KeyEvent.VK_S,this);

517. createMenuItem(fileSaveAs,KeyEvent.VK_A,fileMenu,this);

518. fileMenu.addSeparator();

519. temp=createMenuItem(filePageSetup,KeyEvent.VK_U,fileMenu,this);

520. temp.setEnabled(false);

521. createMenuItem(filePrint,KeyEvent.VK_P,fileMenu,KeyEvent.VK_P,this);

522. fileMenu.addSeparator();

523. createMenuItem(fileExit,KeyEvent.VK_X,fileMenu,this);

524.

525. temp=createMenuItem(editUndo,KeyEvent.VK_U,editMenu,KeyEvent.VK_Z,this);

526. temp.setEnabled(false);

527. editMenu.addSeparator();

528. cutItem=createMenuItem(editCut,KeyEvent.VK_T,editMenu,KeyEvent.VK_X,this);

529. copyItem=createMenuItem(editCopy,KeyEvent.VK_C,editMenu,KeyEvent.VK_C,this);

530. createMenuItem(editPaste,KeyEvent.VK_P,editMenu,KeyEvent.VK_V,this);

531. deleteItem=createMenuItem(editDelete,KeyEvent.VK_L,editMenu,this);

532. deleteItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_DELETE,0));

533. editMenu.addSeparator();

534. findItem=createMenuItem(editFind,KeyEvent.VK_F,editMenu,KeyEvent.VK_F,this);

535. findNextItem=createMenuItem(editFindNext,KeyEvent.VK_N,editMenu,this);

536. findNextItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F3,0));

537. replaceItem=createMenuItem(editReplace,KeyEvent.VK_R,editMenu,KeyEvent.VK_H,this);

538. gotoItem=createMenuItem(editGoTo,KeyEvent.VK_G,editMenu,KeyEvent.VK_G,this);

539. editMenu.addSeparator();

540. selectAllItem=createMenuItem(editSelectAll,KeyEvent.VK_A,editMenu,KeyEvent.VK_A,this);

541. createMenuItem(editTimeDate,KeyEvent.VK_D,editMenu,this)

542. .setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F5,0));

543.

544. createCheckBoxMenuItem(formatWordWrap,KeyEvent.VK_W,formatMenu,this);

545.

546. createMenuItem(formatFont,KeyEvent.VK_F,formatMenu,this);

547. formatMenu.addSeparator();

548. createMenuItem(formatForeground,KeyEvent.VK_T,formatMenu,this);

549. createMenuItem(formatBackground,KeyEvent.VK_P,formatMenu,this);

550.

551. createCheckBoxMenuItem(viewStatusBar,KeyEvent.VK_S,viewMenu,this).setSelected(true);

552. /************For Look and Feel***/

553. LookAndFeelMenu.createLookAndFeelMenuItem(viewMenu,this.f);

554.

555.

556. temp=createMenuItem(helpHelpTopic,KeyEvent.VK_H,helpMenu,this);

557. temp.setEnabled(false);

558. helpMenu.addSeparator();

559. createMenuItem(helpAboutNotepad,KeyEvent.VK_A,helpMenu,this);

560.

561. MenuListener editMenuListener=new MenuListener()

562. {

563. public void menuSelected(MenuEvent evvvv)

564. {

565. if(Notepad.this.ta.getText().length()==0)

566. {

567. findItem.setEnabled(false);

568. findNextItem.setEnabled(false);

569. replaceItem.setEnabled(false);

570. selectAllItem.setEnabled(false);

571. gotoItem.setEnabled(false);

572. }

573. else

574. {

575. findItem.setEnabled(true);

576. findNextItem.setEnabled(true);

577. replaceItem.setEnabled(true);

578. selectAllItem.setEnabled(true);

579. gotoItem.setEnabled(true);

580. }

581. if(Notepad.this.ta.getSelectionStart()==ta.getSelectionEnd())

582. {

583. cutItem.setEnabled(false);

584. copyItem.setEnabled(false);

585. deleteItem.setEnabled(false);

586. }

587. else

588. {

589. cutItem.setEnabled(true);

590. copyItem.setEnabled(true);

591. deleteItem.setEnabled(true);

592. }

593. }

594. public void menuDeselected(MenuEvent evvvv){}

595. public void menuCanceled(MenuEvent evvvv){}

596. };

597. editMenu.addMenuListener(editMenuListener);

598. f.setJMenuBar(mb);

599. }

600. /*************Constructor**************/

601. ////////////////////////////////////

602. public static void main(String[] s)

603. {

604. new Notepad();

605. }

606. }

607. /**************************************/

608. //public

609. interface MenuConstants

610. {

611. final String fileText="File";

612. final String editText="Edit";

613. final String formatText="Format";

614. final String viewText="View";

615. final String helpText="Help";

616.

617. final String fileNew="New";

618. final String fileOpen="Open...";

619. final String fileSave="Save";

620. final String fileSaveAs="Save As...";

621. final String filePageSetup="Page Setup...";

622. final String filePrint="Print";

623. final String fileExit="Exit";

624.

625. final String editUndo="Undo";

626. final String editCut="Cut";

627. final String editCopy="Copy";

628. final String editPaste="Paste";

629. final String editDelete="Delete";

630. final String editFind="Find...";

631. final String editFindNext="Find Next";

632. final String editReplace="Replace";

633. final String editGoTo="Go To...";

634. final String editSelectAll="Select All";

635. final String editTimeDate="Time/Date";

636.

637. final String formatWordWrap="Word Wrap";

638. final String formatFont="Font...";

639. final String formatForeground="Set Text color...";

640. final String formatBackground="Set Pad color...";

641.

642. final String viewStatusBar="Status Bar";

643.

644. final String helpHelpTopic="Help Topic";

645. final String helpAboutNotepad="About Javapad";

646.

647. final String aboutText="Your Javapad";

648. }

My Life with Java & Salesforce........ By Bhupender Dagar

Monday, 13 April 2015

Example of Notepad

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