finddialog.java

用java写的记事本 基本功能与windows自带的相同

package notebook;



import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
import javax.swing.undo.*;
import java.awt.BorderLayout;
import java.awt.Frame;
import java.awt.*;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.JButton;
import java.awt.Button;
import java.awt.Panel;
import com.borland.jbcl.layout.XYLayout;
import com.borland.jbcl.layout.*;
import java.awt.Label;
import javax.swing.JTextField;
import javax.swing.JCheckBox;
import javax.swing.JRadioButton;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ButtonGroup;


public class FindDialog extends JDialog implements ActionListener {
    JPanel panel1 = new JPanel();
    Button btnFind = new Button();
    XYLayout xYLayout1 = new XYLayout();
    Label label1 = new Label();
    JTextField jtxtFind = new JTextField();
    JCheckBox jcbMatchCase = new JCheckBox();
    JRadioButton jrbUp = new JRadioButton();
    JRadioButton jrbDown = new JRadioButton();
    Button btnCance = new Button();
    ButtonGroup buttonGroup1 = new ButtonGroup();
    NoteBook mainFrame = null;


     int FindStartPos = 0; //查找初始位置
     int FindLength  = 0;//文本框中文总长度
    public FindDialog(Frame owner, String title, boolean modal) {
        super(owner, title, modal);
        try {
            setDefaultCloseOperation(DISPOSE_ON_CLOSE);
            jbInit();
            pack();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }

    public FindDialog(Frame parent) {
        super(parent);
        try {
            mainFrame = (NoteBook)parent;
            FindLength = mainFrame.textArea.getText().length();
            setDefaultCloseOperation(DISPOSE_ON_CLOSE);
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }

    public FindDialog() {
        this(new Frame(), "MainFrame_FindBox", false);
    }

    private void jbInit() throws Exception {
        panel1.setLayout(xYLayout1);
        this.setTitle("查找");
        btnFind.setLabel("查找下一个");
        panel1.setPreferredSize(new Dimension(355, 115));
        panel1.setToolTipText("");
        label1.setText("查找内容");
        jcbMatchCase.setText("区分大小写");
        jrbUp.setText("向上");
        jrbDown.setSelected(true);
        jrbDown.setText("向下");
        btnCance.setLabel("取消");
        this.getContentPane().add(panel1, java.awt.BorderLayout.EAST);
        panel1.add(label1, new XYConstraints(20, 20, -1, -1));
        panel1.add(jtxtFind, new XYConstraints(90, 17, 119, -1));
        panel1.add(jcbMatchCase, new XYConstraints(15, 55, -1, -1));
        panel1.add(jrbUp, new XYConstraints(122, 55, -1, -1));
        panel1.add(jrbDown, new XYConstraints(183, 55, -1, -1));
        panel1.setBackground(SystemColor.control);
        jcbMatchCase.setBackground(SystemColor.control);
        jrbUp.setBackground(SystemColor.control);
        jrbDown.setBackground(SystemColor.control);
        buttonGroup1.add(jrbUp);
        buttonGroup1.add(jrbDown);
        panel1.add(btnCance, new XYConstraints(243, 49, 97, -1));
        panel1.add(btnFind, new XYConstraints(243, 15, 97, -1));
        btnCance.addActionListener(this);
        btnFind.addActionListener(this);
    }
    public void actionPerformed(ActionEvent e) {
        if(e.getSource()==btnCance)
            this.dispose();
        else if(e.getSource()==btnFind)//查找
        {
        	
            int a = 0, b = 0;
            String str1,str2,str3,str4,strA,strB;
            str1 = mainFrame.textArea.getText();
            str2 = str1.toLowerCase();

            str3 = this.jtxtFind.getText();//查找的字符串
            str4 = str3.toLowerCase();//转化成小写的查找字符
            mainFrame.strFind=str3;//为主窗口查找字符串赋值
            if (jcbMatchCase.isSelected()==true)
            {
                strA = str1;
                strB = str3;
            }
            else
            {
                strA = str2;
                strB = str4;
            }
            if (jrbUp.isSelected()==true)
           {
                a = strA.lastIndexOf(strB, FindLength-FindStartPos);
                if (a > -1) {
                    mainFrame.textArea.setCaretPosition(a);
                    b = jtxtFind.getText().length();
                    mainFrame.textArea.select(a,a+b);
                    FindStartPos =FindLength-a+1;
                    mainFrame.FindStartPos= FindStartPos;//为主窗口的查找位置赋值
                }
                else
                {
                    JOptionPane.showMessageDialog(null, "找不到\"" + str3+"\".","记事本", 1);
                    FindStartPos=0;
                }
            }
            if (jrbDown.isSelected()==true)
            {
                a = strA.indexOf(strB, FindStartPos);
                if (a > -1)
               {
                    mainFrame.textArea.setCaretPosition(a);
                    b = jtxtFind.getText().length();
                    mainFrame.textArea.select(a, a + b);
                    FindStartPos = a + b;
                    mainFrame.FindStartPos= FindStartPos;//为主窗口的查找位置赋值
                } else {
                    JOptionPane.showMessageDialog(null, "找不到\"" + str3 + "\".",
                                                  "记事本", 1);
                    FindStartPos = 0;
                }
            }
        }
    }
}