myedit.java

来自「a text editor application.」· Java 代码 · 共 731 行 · 第 1/2 页

			text.selectAll();
		}
		
		//ACTION FOR TIME/DATE MENU OPTION OF EDIT MENU 
		if (e.getSource()==TIMEDIT)
		{
			Date currDate;
			String dd;
			currDate = new java.util.Date();
			dd=currDate.toString();
			text.insert(dd,text.getCaretPosition());
		}
		
		//ACTION FOR WORD WRAP MENU OPTION OF EDIT MENU
		if (e.getSource()==WORDEDIT)
		{
			if(WORDEDIT.isSelected())
			text.setLineWrap(true);
			else
			text.setLineWrap(false);
		}
		
		//ACTION FOR SET FONT MENU OPTION OF EDIT MENU
		if (e.getSource()==FONTEDIT)
		{
			fontDialogBox fontS = new fontDialogBox();
		}
			
		//ACTION FOR FIND MENU OPTION OF SEARCH MENU
		if (e.getSource()==FINDSEARCH)
		{
			wholeText=text.getText();
			findString =JOptionPane.showInputDialog(null, "Find What", "Find",
JOptionPane.INFORMATION_MESSAGE);

			ind = wholeText.indexOf(findString,0);
			text.setCaretPosition(ind);
			text.setSelectionStart(ind);
			text.setSelectionEnd(ind+findString.length());
		}
		
		//ACTION FOR FIND NEXT MENU OPTION OF SEARCH MENU
		if (e.getSource()==FINDNEXTSEARCH)
		{
			wholeText= text.getText();
			findString = JOptionPane.showInputDialog(null, "Find What","Find Next",
JOptionPane.INFORMATION_MESSAGE);
			ind = wholeText.indexOf(findString, text.getCaretPosition());
			text.setCaretPosition(ind);
			text.setSelectionStart(ind);
			text.setSelectionEnd(ind+findString.length());
		}
		
		//ACTION FOR ABOUT MENU OPTION OF HELP MENU
		if (e.getSource()==ABOUTHELP)
		{
			JOptionPane.showMessageDialog(null, "This is a simple Text Editor application built using Java.",
			"About Editor",
			JOptionPane.INFORMATION_MESSAGE);	
	 	}
	}	

	//ACTION FOR NEW MENU OPTION OF FILE MENU
	public void newfile()
	{
		if(!text.getText().equals(""))
		{
			opened=false;
			int confirm = JOptionPane.showConfirmDialog(null,
			"Text in the Untitled file has changed. \n Do you want to save the changes?",
			"New File",
			JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.INFORMATION_MESSAGE);
	
			if( confirm == JOptionPane.YES_OPTION )
			{
				save();
				text.setText(null);
			}
			else if( confirm == JOptionPane.NO_OPTION )
			{
				text.setText(null);
			}
		}
	}
	
	//ACTION FOR OPEN MENU OPTION OF FILE MENU
	public void open()
	{
		text.setText(null);
		JFileChooser ch = new JFileChooser();
	    	ch.setCurrentDirectory(new File("."));
		ch.setFileFilter(new javax.swing.filechooser.FileFilter()
       		{
           		public boolean accept(File f)
        		{
              			return f.isDirectory()
               			|| f.getName().toLowerCase().endsWith(".java");
        		}
			public String getDescription()
        		{
     		           return "Java files";
           		}
         	});
		int result = ch.showOpenDialog(new JPanel());
		if(result == JFileChooser.APPROVE_OPTION) 
		{
			filename = String.valueOf(ch.getSelectedFile());
			setTitle(filename);
			opened=true;
			FileReader fr;
			BufferedReader br;
			
			try
			{
				fr=new FileReader (filename);
				br=new BufferedReader(fr);
				String s;
				while((s=br.readLine())!=null)
				{
					text.append(s);
					text.append("\n");
				}
				fr.close();
			}
			catch(FileNotFoundException ex)
                           {
				JOptionPane.showMessageDialog(this, "Requested file not found", "Error Dialog box", JOptionPane.ERROR_MESSAGE);}
                           
                        catch(Exception ex)
                           {System.out.println(ex);}
		}
	}

	//ACTION FOR SAVE MENU OPTION OF FILE MENU
	public void save()
	{
		if(opened==true)
		{
			try
			{
				FileWriter f1 = new FileWriter(filename);
				f1.write(text.getText());
				f1.close();
				opened = true;
			}
			catch(FileNotFoundException ex)
                           {
				JOptionPane.showMessageDialog(this, "Requested file not found", "Error Dialog box", JOptionPane.ERROR_MESSAGE);}
			catch(IOException ioe){ioe.printStackTrace();}
		}
		else
		{
			JFileChooser fc = new JFileChooser();
			fc.setCurrentDirectory(new File("."));
			int result = fc.showSaveDialog(new JPanel());
					
			if(result == JFileChooser.APPROVE_OPTION) 
			{
				filename = String.valueOf(fc.getSelectedFile());
				setTitle(filename);
				try
				{
				FileWriter f1 = new FileWriter(filename);
				f1.write(text.getText());
				f1.close();
				opened = true;
				}
			catch(FileNotFoundException ex)
                           {
				JOptionPane.showMessageDialog(this, "Requested file not found", "Error Dialog box", JOptionPane.ERROR_MESSAGE);}

				catch(IOException ioe){ioe.printStackTrace();}
			}
			
		}
	}

	//ACTION FOR EXIT MENU OPTION OF FILE MENU AND CLOSE WINDOW BUTTON
	public void exitApln()
	{
		if(!text.getText().equals(""))
		{
			int confirm = JOptionPane.showConfirmDialog(null,
			"Text in the file has changed. \n Do you want to save the changes?",
			"Exit",
			JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.INFORMATION_MESSAGE);
	
			if( confirm == JOptionPane.YES_OPTION )
			{
				save();
				dispose();
				System.exit(0);
			}
			else if( confirm == JOptionPane.CANCEL_OPTION )
			{
				e=new myedit();
				String s= text.getText();
				e.setVisible(true);
				e.text.setText(s);
			}
			else if( confirm == JOptionPane.NO_OPTION )
			{
				dispose();
				System.exit(0);
			}
		}
		else
		{
			System.exit(0);
		}
    	}
	
    	//CLASS FOR UNDOLISTENER
	class UndoListener implements UndoableEditListener
	{
   		public void undoableEditHappened(UndoableEditEvent e) 
   		{
    		undo.addEdit(e.getEdit());
       		undoAction.update();
    		}	  
	}  
	
	//CLASS FOR BUILDING AND DISPLAYING FONT DIALOG BOX
	class fontDialogBox extends JFrame implements ActionListener
	{
		//DECLARATION OF ALL VARIABLES USED IN fontDialogBox CLASS
		
		String availableFontString[] = GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames();
		JList fontList = new JList(availableFontString);
		JLabel fontLabel = new JLabel("Font");
		JTextField valueFont=new JTextField("Arial");
		JScrollPane fontPane = new JScrollPane(fontList);
		
		
		String fontStyleString[] = {"Normal","Bold","Italic","Bold Italic"};
		JList styleList = new JList(fontStyleString);
		JLabel styleLabel = new JLabel("Style");
		int v = ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS;
		int h = ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;
		JScrollPane stylePane = new JScrollPane(styleList,v,h);
		JTextField valueStyle=new JTextField("Normal");
	
		String fontSizeString[] = {"8","10","12","14","16","18","20","22","24","28"};
		JList sizeList = new JList(fontSizeString);
		JLabel sizeLabel = new JLabel("Font size");
		JScrollPane sizePane = new JScrollPane(sizeList);
		JTextField valueSize=new JTextField("12");
	
		JButton okButton = new JButton("OK");
		JButton cancelButton = new JButton("Cancel");
	
		JLabel sampleLabel = new JLabel("Sample:");
		JTextField sample = new JTextField("   AaBbCc");
	
		Font selectedFont;
		
		//DEFAULT CONSTRUCTOR OF fontDialogBox CLASS
		public fontDialogBox()
		{
			setSize(500,300);
			setTitle("Font");
			setVisible(true);
			sample.setEditable(false);
		
			getContentPane().setLayout(null);
		
			fontLabel.setBounds(10,10,170,20);
			valueFont.setBounds(10,35,170,20);
			fontPane.setBounds(10,60,170,150);
		
			styleLabel.setBounds(200,10,100,20);
			valueStyle.setBounds(200,35,100,20);
			stylePane.setBounds(200,60,100,150);
		
			sizeLabel.setBounds(320,10,50,20);
			valueSize.setBounds(320,35,50,20);
			sizePane.setBounds(320,60,50,150);
		
			okButton.setBounds(400,35,80,20);
			cancelButton.setBounds(400,60,80,20);
		
			sampleLabel.setBounds(150,235,50,30);
			sample.setBounds(200,235,100,30);
		
			getContentPane().add(fontLabel);
			getContentPane().add(fontPane);
			getContentPane().add(valueFont);
		
			getContentPane().add(styleLabel);
			getContentPane().add(stylePane);
			getContentPane().add(valueStyle);
		
			getContentPane().add(sizeLabel);
			getContentPane().add(sizePane);
			getContentPane().add(valueSize);
	
			getContentPane().add(okButton);
			getContentPane().add(cancelButton);
			getContentPane().add(sampleLabel);
			getContentPane().add(sample);
		
			okButton.addActionListener(this);
			cancelButton.addActionListener(this);
		
			fontList.addListSelectionListener(new ListSelectionListener()
			{
				public void valueChanged(ListSelectionEvent event) 
				{
      					if (!event.getValueIsAdjusting()) 
      					{
	    				valueFont.setText(fontList.getSelectedValue().toString());
	    				selectedFont = new Font(valueFont.getText(),styleList.getSelectedIndex(),Integer.parseInt(valueSize.getText()));
	    				sample.setFont(selectedFont);
    					}
    				}
    			});
    	
    			styleList.addListSelectionListener(new ListSelectionListener()
			{
				public void valueChanged(ListSelectionEvent event) 
				{
      				if (!event.getValueIsAdjusting()) 
      					{
	      				valueStyle.setText(styleList.getSelectedValue().toString());
	      				selectedFont = new Font(valueFont.getText(),styleList.getSelectedIndex(),Integer.parseInt(valueSize.getText()));
	    				sample.setFont(selectedFont);
      					}
      				}
    			});
    	
    			sizeList.addListSelectionListener(new ListSelectionListener()
			{
				public void valueChanged(ListSelectionEvent event) 
				{
      					if (!event.getValueIsAdjusting()) 
      					{
      						valueSize.setText(sizeList.getSelectedValue().toString());
      						selectedFont = new Font(valueFont.getText(),styleList.getSelectedIndex(),Integer.parseInt(valueSize.getText()));
	    					sample.setFont(selectedFont);
      					}
 				}   	
      			});
		}//END OF DEFAULT CONSTRUCTOR OF fontdialogBox CLASS 
	
		public void actionPerformed(ActionEvent ae)
		{
			if(ae.getSource()==okButton)
			{
				selectedFont = new Font(valueFont.getText(),styleList.getSelectedIndex(),Integer.parseInt(valueSize.getText()));
	  		  	text.setFont(selectedFont);
				setVisible(false);
			}
			if(ae.getSource()==cancelButton)		
			{
				setVisible(false);
			}
		}
	}// END OF fontDialogBox CLASS	

	//MAIN FUNCTION OF MYEDIT CLASS
	public static void main(String args[])
	{
		e= new myedit();
	}
}//END OF MYEDIT CLASS