notepad.java

基于原本对该课题的了解

		
		//粘贴	
		else if(e.getSource()==editMenu_Paste||e.getSource()==popupMenu_Paste)
			{
				editArea.requestFocus();
				Transferable contents=clipBoard.getContents(this);
		        if(contents==null) return;
		        String text;
		        text="";
		        
		        try{
		            text=(String)contents.getTransferData(DataFlavor.stringFlavor);
		        }
		        catch(Exception exception){
		        }
		        
		       	editArea.replaceRange(text,editArea.getSelectionStart(),editArea.getSelectionEnd());
//		       
			}
		
		//删除
		else if(e.getSource()==editMenu_Delete||e.getSource()==popupMenu_Delete)
			{
				editArea.requestFocus();
				editArea.replaceRange("",editArea.getSelectionStart(),editArea.getSelectionEnd());
//				
			}
		
		//查找
		else if(e.getSource()==editMenu_Find)
			{
				editArea.requestFocus();
				{
					editArea.requestFocus();
					editArea.setCaretPosition(0);
				}
				mySearch();
			}
		
		//查找下一个(此功能尚未能很好实现，所以就先用查找功能来代替)	
		else if(e.getSource()==editMenu_FindNext)
			{
				mySearch();
			}
			
		//替换(与查找功能集成在一起了)
		else if(e.getSource()==editMenu_Replace)
		{
			mySearch();
		}
		
		//转到	
		else if(e.getSource()==editMenu_GoTo)
			{
				final JDialog gotoDialog=new JDialog(this,"转到下列行");
				JLabel gotoLabel=new JLabel("行数(L):");
				final JTextField linenum=new JTextField(20);
				linenum.setText("1");
				linenum.selectAll();
				
				JButton okButton=new JButton("确定");
				okButton.addActionListener(new ActionListener(){
					
					public void actionPerformed(ActionEvent e){
						int totalLine = editArea.getLineCount(); 
						int[] lineNumber = new int[totalLine + 1]; 
						String s = editArea.getText(); 
						int pos = 0, t = 0; 
						
						while(true) { 
							pos = s.indexOf('\12', pos); 
							if(pos == -1) 
							break; 
							lineNumber[t++] = pos++; 
						} 
						
						int gt = 1; 
						try { 
							gt = Integer.parseInt(linenum.getText()); 
						}
						catch(NumberFormatException efe) { 
							JOptionPane.showMessageDialog(null, "请输入行数!", "提示",JOptionPane.WARNING_MESSAGE); 
							linenum.requestFocus(true);
							return;
						} 
						
						if(gt < 2 || gt >= totalLine) { 
							if(gt < 2) 
								editArea.setCaretPosition(0); 
							else 
								editArea.setCaretPosition(s.length()); 
						} 
						else 
							editArea.setCaretPosition(lineNumber[gt-2] + 1); 
						
						gotoDialog.dispose(); 
					} 
					
				});
				
				JButton cancelButton=new JButton("取消");
				cancelButton.addActionListener(new ActionListener(){
					public void actionPerformed(ActionEvent e){
						gotoDialog.dispose();
					}
				});
				
				Container con=gotoDialog.getContentPane();
				con.setLayout(new FlowLayout());
				con.add(gotoLabel);
				con.add(linenum);
				con.add(okButton);
				con.add(cancelButton);
				
				gotoDialog.setSize(200,100);
				gotoDialog.setResizable(false);
				gotoDialog.setLocation(300,280);
				gotoDialog.setVisible(true);
				
			}//"转到"处理结束
		
		//插入时间日期	
		else if(e.getSource()==editMenu_TimeDate)
			{
				editArea.requestFocus();
				SimpleDateFormat currentDateTime = new SimpleDateFormat("HH:mm yyyy-MM-dd"); 
				editArea.insert(currentDateTime.format(new Date()),editArea.getCaretPosition());
			}
		
		//全选	
		else if(e.getSource()==popupMenu_SelectAll||e.getSource()==editMenu_SelectAll)
			{
				editArea.selectAll();
			}
			
		//自动换行
		else if(e.getSource()==formatMenu_LineWrap)
			{
				if(formatMenu_LineWrap.getState()) 
				{
					editArea.setLineWrap(true);
				} 
				else
					editArea.setLineWrap(false);
			}
		
		//字体设置
		else if(e.getSource()==formatMenu_Font)
			{
				editArea.requestFocus();
				new MyFont();			
			}
		
		//设置字体颜色(前景色)
		else if(e.getSource()==formatMenu_Color_FgColor)
			{
				editArea.requestFocus();
				Color color=JColorChooser.showDialog(this,"更改字体颜色",Color.black);
				if(color!=null)
				{
					editArea.setForeground(color);
				} 
				else
					return;
			}
		
		//设置编辑区背景颜色
		else if(e.getSource()==formatMenu_Color_BgColor)
			{
				editArea.requestFocus();
				Color color=JColorChooser.showDialog(this,"更改背景颜色",Color.white);
				if(color!=null)
				{
					editArea.setBackground(color);
				} 
				else
					return;
			}
		
		
			
	}/*方法actionPerformed()结束*/
	 class closeWindow extends WindowAdapter
 {/*在mainFrame类中定义用于响应关闭窗口事件的类,使它成WindowAdapter的子类*/
     public void windowClosing(WindowEvent e){
         //实现处理窗口关闭事件的方法windowClosing()
        String currentValue = editArea.getText();
        boolean isTextChange = (currentValue.equals(oldValue))?false:true;//用于判断当前文本内容是否发生变化
        if(isTextChange&&isNewFile){
            int i = JOptionPane.showConfirmDialog(Notepad.this,
                    "文件的文字已经改变\n"+"想保存文件吗?",
                    "文本编辑器",JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.WARNING_MESSAGE);
            if(i == JOptionPane.YES_OPTION){
                editArea.requestFocus();
				if(isNewFile){
				
					String str=null;
					
					JFileChooser fileChooser=new JFileChooser();
					fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
					fileChooser.setApproveButtonText("确定");
					fileChooser.setDialogTitle("另存为");
					
					int result=fileChooser.showSaveDialog(null);
					
					if(result==JFileChooser.CANCEL_OPTION){
						statusLabel.setText("　您没有选择任何文件");
						return;
					}					
	
					File saveFileName=fileChooser.getSelectedFile();
				
					if(saveFileName==null||saveFileName.getName().equals(""))
						JOptionPane.showMessageDialog(null,"不合法的文件名","不合法的文件名",JOptionPane.ERROR_MESSAGE);
					else {
						try{
							FileWriter fw=new FileWriter(saveFileName);
							BufferedWriter bfw=new BufferedWriter(fw);
							bfw.write(editArea.getText(),0,editArea.getText().length());
							bfw.flush();
							fw.close();
							
							isNewFile=false;
							currentFile=saveFileName;
							oldValue=editArea.getText();							
							statusLabel.setText("　当前打开文件:"+saveFileName.getAbsoluteFile());
						}							
						catch(IOException ioException){					
						}				
					}
				}
				else
				{
					try{
						FileWriter fw=new FileWriter(currentFile);
						BufferedWriter bfw=new BufferedWriter(fw);
						bfw.write(editArea.getText(),0,editArea.getText().length());
						bfw.flush();
						fw.close();
					}							
					catch(IOException ioException){					
					}
				}
                System.exit(0);
            }                 
            else if(i == JOptionPane.NO_OPTION){
                System.exit(0);
            }
        }
        else
            System.exit(0);  //退出程序   
     }
 }
	
	
	//main 方法
	public static void main(String args[])
	{
		//设置界面为WindowsLookAndFeel
		try 
		{ 
			UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); 
		}
		catch(Exception e) { 
		} 
	
		Notepad	frame = new Notepad();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}/*main 方法结束*/
	
	//实现了接口UndoableListener的类UndoHandler
	class UndoHandler implements UndoableEditListener { 
		public void undoableEditHappened(UndoableEditEvent uee){ 
		} 
	}/*End of class UndoHandler */
	
	//用于设置字体的类MyFont
	class MyFont implements ActionListener{
		final JDialog fontDialog;
		final JTextField tfFont,tfSize,tfStyle;
		final int fontStyleConst[]={Font.PLAIN,Font.BOLD,Font.ITALIC,Font.BOLD+Font.ITALIC};
		final JList listStyle,listFont,listSize;
		JLabel sample;
		
		//构造函数MyFont
		public MyFont(){
		
			fontDialog = new JDialog(Notepad.this,"字体设置",true);
			Container con=fontDialog.getContentPane();
			con.setLayout(new FlowLayout(FlowLayout.LEFT));
			
			Font currentFont=editArea.getFont();
			
			JLabel lblFont=new JLabel("字体(F):");
			lblFont.setPreferredSize(new Dimension(100,20));
			JLabel lblStyle=new JLabel("字形(Y):");
			lblStyle.setPreferredSize(new Dimension(100,20));
			JLabel lblSize=new JLabel("大小(S):");
			lblSize.setPreferredSize(new Dimension(100,20));
			tfFont=new JTextField(15);
			tfFont.setText(currentFont.getFontName());
			tfFont.selectAll();
			tfFont.setPreferredSize(new Dimension(200,20));
			tfStyle=new JTextField(15);
			if(currentFont.getStyle()==Font.PLAIN)
				tfStyle.setText("常规");
			else if(currentFont.getStyle()==Font.BOLD)
				tfStyle.setText("粗体");
			else if(currentFont.getStyle()==Font.ITALIC)
				tfStyle.setText("斜体");
			else if(currentFont.getStyle()==(Font.BOLD+Font.ITALIC))
				tfStyle.setText("粗斜体");
				
			tfFont.selectAll();
			tfStyle.setPreferredSize(new Dimension(200,20));
			tfSize=new JTextField(8);
			tfSize.setText(currentFont.getSize()+"");
			tfSize.selectAll();
			tfSize.setPreferredSize(new Dimension(200,20));
		
								
						
			final String fontStyle[]={"常规","粗体","斜体","粗斜体"};
			listStyle=new JList(fontStyle);
						
			GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();
			final String fontName[]=ge.getAvailableFontFamilyNames();
			int defaultFontIndex=0;
			for(int i=0;i<fontName.length;i++)
				{
					if(fontName[i].equals(currentFont.getFontName()))
						{
							defaultFontIndex=i;
							break;
						}
				}
			listFont=new JList(fontName);
			listFont.setSelectedIndex(defaultFontIndex);			
			listFont.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
			listFont.setVisibleRowCount(7);
			listFont.setFixedCellWidth(82);
			listFont.setFixedCellHeight(20);
			listFont.addListSelectionListener(
				new ListSelectionListener(){
					public void valueChanged(ListSelectionEvent event){
						tfFont.setText(fontName[listFont.getSelectedIndex()]);
						tfFont.requestFocus();
						tfFont.selectAll();	
						updateSample();
					}
				}
				);

			listStyle.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
			if(currentFont.getStyle()==Font.PLAIN)
				listStyle.setSelectedIndex(0);
			else if(currentFont.getStyle()==Font.BOLD)
				listStyle.setSelectedIndex(1);
			else if(currentFont.getStyle()==Font.ITALIC)
				listStyle.setSelectedIndex(2);
			else if(currentFont.getStyle()==(Font.BOLD+Font.ITALIC))
				listStyle.setSelectedIndex(3);
			
			listStyle.setVisibleRowCount(7);
			listStyle.setFixedCellWidth(99);
			listStyle.setFixedCellHeight(20);
			listStyle.addListSelectionListener(
				new ListSelectionListener(){
					public void valueChanged(ListSelectionEvent event){
						tfStyle.setText(fontStyle[listStyle.getSelectedIndex()]);
						tfStyle.requestFocus();
						tfStyle.selectAll();
						updateSample();	
					}
				}
				);			
			
			final String fontSize[]={"8","9","10","11","12","14","16","18","20","22","24","26","28","36","48","72"};
			listSize=new JList(fontSize);
			int defaultFontSizeIndex=0;
			for(int i=0;i<fontSize.length;i++)
			{
				if(fontSize[i].equals(currentFont.getSize()+""))
				{
					defaultFontSizeIndex=i;
					break;
				}
			}
			listSize.setSelectedIndex(defaultFontSizeIndex);
			
			listSize.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
			listSize.setVisibleRowCount(7);
			listSize.setFixedCellWidth(39);
			listSize.setFixedCellHeight(20);
			listSize.addListSelectionListener(
				new ListSelectionListener(){
					public void valueChanged(ListSelectionEvent event){
						tfSize.setText(fontSize[listSize.getSelectedIndex()]);
						tfSize.requestFocus();
						tfSize.selectAll();	
						updateSample();
					}
				}
				);
			fontOkButton=new JButton("确定");
			fontOkButton.addActionListener(this);
			JButton cancelButton=new JButton("取消");
			cancelButton.addActionListener(new ActionListener(){
				public void actionPerformed(ActionEvent e){
					fontDialog.dispose();
				}
			});
			
			sample=new JLabel("欢迎使用 Notepad");
			sample.setHorizontalAlignment(SwingConstants.CENTER);
			sample.setPreferredSize(new Dimension(300,50));
			
			JPanel samplePanel=new JPanel();
			samplePanel.setBorder(BorderFactory.createTitledBorder("示例"));
			samplePanel.add(sample);
			
			con.add(lblFont);
			con.add(lblStyle);
			con.add(lblSize);
			con.add(tfFont);
			con.add(tfStyle);
			con.add(tfSize);
			con.add(fontOkButton);
			con.add(new JScrollPane(listFont));
			con.add(new JScrollPane(listStyle));
			con.add(new JScrollPane(listSize));
			con.add(cancelButton);
			con.add(samplePanel);
			updateSample();
			
			
			fontDialog.setSize(350,340);
			fontDialog.setLocation(200,200);
			fontDialog.setResizable(false);
			fontDialog.setVisible(true);
			}//构造函数结束
			
			//更新示例显示的字体和风格大小等
			public void updateSample(){
				Font sampleFont=new Font(tfFont.getText(),fontStyleConst[listStyle.getSelectedIndex()],Integer.parseInt(tfSize.getText()));
				sample.setFont(sampleFont);
			}//End method updateSample
			
			//设置文本编辑区的字体
			public void actionPerformed(ActionEvent e){
				if(e.getSource()==fontOkButton){
					Font tempFont=new Font(tfFont.getText(),fontStyleConst[listStyle.getSelectedIndex()],Integer.parseInt(tfSize.getText()));
					editArea.setFont(tempFont);
					fontDialog.dispose();					
				}
			}//End method actionPerformed	
                        
	}/*End of class MyFont*/
		 
 }