finddlg.java

一个记事本程序

package notepad;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class FindDlg extends JDialog implements ActionListener, ItemListener {
	// GUI components
	JLabel label;

	JTextField key;

	JCheckBox isIgnoreCase;

	JRadioButton up, down;

	ButtonGroup group;

	JButton btn_findNext, btn_cancel;

	JPanel panel1, panel2, panel3;

	// 成员变量
	boolean ignoreCase = true; // 查找时是否忽略大小写,默认 忽略

	String findKey = ""; // 输入的要查找的字符串

	boolean isUp; // 查找方向是否向上，否则就是向下,默认 向下查找

	// "父窗口"
	NotePad notePad;

	public FindDlg(NotePad initNotePad) {
		setTitle("查找");
		notePad = initNotePad;
		notePad.mileStone = 0;
		notePad.isFirstCall = true;
		Container con = getContentPane();
		panel1 = new JPanel();
		panel2 = new JPanel();
		panel3 = new JPanel();
		label = new JLabel("查找内容(N):");
		key = new JTextField(20);
		panel1.setLayout(new FlowLayout());
		panel1.add(label);
		panel1.add(key);

		isIgnoreCase = new JCheckBox("区分大小写(C)");
		up = new JRadioButton("向上查找(U)", false);
		down = new JRadioButton("向下查找(D)", true);
		group = new ButtonGroup();
		group.add(up);
		group.add(down);
		isIgnoreCase.addItemListener(this);
		up.addItemListener(this);
		down.addItemListener(this);
		panel2.add(isIgnoreCase);
		panel2.add(up);
		panel2.add(down);

		btn_findNext = new JButton("查找下一个(N)");
		btn_cancel = new JButton("取消");
		btn_findNext.addActionListener(this);
		btn_cancel.addActionListener(this);
		panel3.add(btn_findNext);
		panel3.add(btn_cancel);

		setLayout(new BorderLayout());
		con.add(panel1, BorderLayout.NORTH);
		con.add(panel2, BorderLayout.CENTER);
		con.add(panel3, BorderLayout.SOUTH);

		// setBounds(100,100,400,300);
		setSize(400, 140);
		setVisible(false);

	}

	public void actionPerformed(ActionEvent e) {
		// TODO Auto-generated method stub
		if (e.getSource() == btn_findNext) {
			findKey = key.getText();
			// 调用搜索函数来搜索整个工作区中的文字
			if (!notePad.OnFindMenuItem(findKey, ignoreCase, isUp)) {
				JOptionPane.showMessageDialog(null, "找不到关键字 \"" + findKey
						+ "\"");
			}
		}
		if (e.getSource() == btn_cancel) {
			this.setVisible(false);
			this.dispose();
		}
	}

	public void itemStateChanged(ItemEvent e) {
		// TODO Auto-generated method stub
		if (e.getSource() == isIgnoreCase) {
			ignoreCase = isIgnoreCase.isSelected() ? false : true;
		}
		if (e.getSource() == up) {
			isUp = up.isSelected() ? true : false;
		}
		if (e.getSource() == down) {
			isUp = down.isSelected() ? false : true;
		}
	}
}