finddialog.java

java语言编辑的一个文本编辑器,模块清晰明了,用到JAVA的反射机制,可以给选中的单词加不同的颜色进行高亮显示.调整字符大小.

package javadesign;
import java.awt.*;
import java.awt.event.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.swing.*;
import javax.swing.border.*;
/*************************************************
 * 类FindDialog用来进行查找
 *
 ***********************************************/
public class FindDialog extends JDialog implements ActionListener{
    private JLabel findLabel=new JLabel("输入要查找的内容:");
    public static JTextField findText = new JTextField(15);
    private JButton buttonNext = new JButton("查找下一个");
    private ButtonGroup group=new ButtonGroup();
    private JButton buttonCancel = new JButton("取消");
    private JRadioButton findUp=new JRadioButton("向上",false);
    private JRadioButton findDown=new JRadioButton("向下",true);
    private JCheckBox letter=new JCheckBox("区分大小写",false);
    private Container container=this.getContentPane();
    private JPanel findPanel=new JPanel();
    private JPanel buttonPanel=new JPanel();
    private JPanel aspectPanel=new JPanel();
    Pattern pattern ;
    // 用Pattern类的matcher()方法生成一个Matcher对象
    public static Matcher matcher ;
    boolean begin=true ,letterflag=true,updownflag=false;
    int judge=Pattern.CASE_INSENSITIVE;	//区分大小写的值为1,不区别为2,此时judge=2
    int startp,len,count=1;
    
    public FindDialog(Frame frame,String title,boolean modal){
        super(frame,title,modal);
        this.setSize(380, 150);
        this.setResizable(false);
        setLocation(Note.xp+ 50, Note.yp+ 150);
        buttonNext.setEnabled(false);
        findText.selectAll();   //全选 
        findText.addKeyListener(new KeyAdapter() {
            public void keyReleased(KeyEvent e) {
                if(findText.getText().length()!=0)
                    buttonNext.setEnabled(true);
                else
                    buttonNext.setEnabled(false);
            }
        });
        group.add(findUp);
        group.add(findDown);
        container.setLayout(null);
        findPanel.setLayout(new GridLayout(1,2));
        buttonPanel.setLayout(new GridLayout(2,1,0,5));
        aspectPanel.setLayout(new GridLayout(1,2));
        findPanel.add(findLabel);
        findPanel.add(findText);
        buttonPanel.add(buttonNext);
        buttonPanel.add(buttonCancel);
        aspectPanel.add(findUp);
        aspectPanel.add(findDown);
        findPanel.setBounds(10,10,250,25);
        buttonPanel.setBounds(265,10,100,50);
        letter.setBounds(10,70,100,20);
        aspectPanel.setBounds(120,50,140,50);
        //建立类型为凸起的边框
        Border border=BorderFactory.createEtchedBorder(EtchedBorder.RAISED);
        //建立边框式为border,标题为"方向"的TitledBorder
        aspectPanel.setBorder(BorderFactory.createTitledBorder(border,"方向"));
        container.add(findPanel);
        container.add(buttonPanel);
        container.add(letter);
        container.add(aspectPanel);
        this.getRootPane().setDefaultButton(buttonNext); // 默认回车按钮//
        buttonNext.addActionListener(this);
        findUp.addActionListener(this);
        findDown.addActionListener(this);
        buttonCancel.addActionListener(this);        
        letter.addActionListener(this);
        this.setVisible(true);
    }
    public void actionPerformed(ActionEvent e) {
        if(e.getSource()==buttonNext) {
            Note.selectflag=false;
            switch(count) {
                case 0:String leave=Note.display.getText().substring(0,Note.display.getCaretPosition());
                if(leave.matches(findText.getText())||Note.display.getCaretPosition()-len<=0) {
                    JOptionPane.showMessageDialog(null,"找不到 \""+findText.getText()+"\"","文本编辑器",JOptionPane.WARNING_MESSAGE);
                    int i=Note.display.getText().indexOf(findText.getText());
                    Note.display.select(i,i+findText.getText().length());
                    break;
                }
                Note.display.select(0, Note.display.getCaretPosition()-len);
                startp=Note.display.getSelectedText().lastIndexOf(findText.getText());
                len=findText.getText().length();
                Note.display.select(startp, startp+len);
                break;
                case 1:if(begin){
                    try{
                        Note.selectflag=false;
                        //编译模式,参数findText.getText()表示输入的正则表达式,judge表示模式类型
                        pattern=Pattern.compile(findText.getText(),judge);
                        //获取匹配器,Note.display.getText()为待处理的字符串
                        matcher = pattern.matcher(Note.display.getText());  //用Pattern类的matcher()方法生成一个Matcher对象
                        begin=false;
                    }catch(Exception ev){}
                }
                if (matcher.find(Note.display.getCaretPosition()))    //从光标处开始匹配模式
                    Note.display.select(matcher.start(), matcher.end());
                else
                    JOptionPane.showMessageDialog(null,"找不到 \""+findText.getText()+"\"","文本编辑器",JOptionPane.WARNING_MESSAGE);
                break;
            }
        } else if(e.getSource()==findUp)
            count=0;
        else if(e.getSource()==findDown){
            begin=true;
            count=1;
        } else if(e.getSource()==buttonCancel)
            this.setVisible(false);
        else if(e.getSource()==letter) {
            if(letterflag){judge=1;letterflag=false;} else {judge=2;letterflag=true;}
            begin=true;
        }
    }
}