package demo13;

public class Example6_13 {

public static void main(String[] args) {
// TODO Auto-generated method stub
new TextJFrame();
}

}

 

 

package demo13;

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

public class TextJFrame extends JFrame{
private JFrame jf;
private JTextArea text;
private JComboBox jcb;
private JCheckBox check_bold, check_italic;
private JRadioButton radio_red,radio_green,radio_blue;
private JPopupMenu popmenu;

public TextJFrame(){
jf = new JFrame("文本编辑器");
jf.setBounds(100,100,500,200);
jf.setDefaultCloseOperation(EXIT_ON_CLOSE);
jf.setVisible(true);
JMenuBar menubar = new JMenuBar();
jf.setJMenuBar(menubar);
String str[] = {"文件","编辑","帮助"};
JMenu menu[] = new JMenu[str.length];
for(int i = 0; i <str.length;i++){
menu[i] = new JMenu(str[i]);
menubar.add(menu[i]);
}
text = new JTextArea("示例文本");
jf.getContentPane().add(text);
JToolBar toolbar = new JToolBar();
toolbar.setLayout(new FlowLayout());
jf.getContentPane().add(toolbar,"North");
jcb = new JComboBox();
jcb.setEditable(true);
toolbar.add(jcb);
String[]str_size = {"20","30","40","50","60"};
String str_file[] = {"打开","保存","退出"};
JMenuItem menuitem[] = new JMenuItem[str_file.length];
for(int j = 0; j <str_file.length;j++){
menuitem[j] = new JMenuItem(str_file[j]);
menu[0].add(menuitem[j]);
menu[0].addSeparator();
menuitem[j].addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(e.getSource() instanceof JMenuItem){
if(e.getActionCommand() == "退出"){
if(JOptionPane.showConfirmDialog(jf,"你确定退出么？")==0)
System.exit(0);
}
}
}
});
}
check_bold = new JCheckBox("粗体");
check_italic = new JCheckBox("斜体");
toolbar.add(check_bold);
toolbar.add(check_italic);
check_bold.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(e.getSource() instanceof JCheckBox){
if(e.getActionCommand() == "粗体"){
Font f = text.getFont();
text.setFont(new Font(f.getFontName(),Font.BOLD,f.getSize()));
}
}
}
});
check_italic.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(e.getSource() instanceof JCheckBox){
if(e.getActionCommand()=="斜体"){
Font f = text.getFont();
text.setFont(new Font(f.getFontName(),Font.ITALIC,f.getSize()));
}
}
}
});
radio_red = new JRadioButton("红色");
radio_green = new JRadioButton("绿色");
radio_blue = new JRadioButton("蓝色");
ButtonGroup bg = new ButtonGroup();
bg.add(radio_red);
bg.add(radio_green);
bg.add(radio_blue);
toolbar.add(radio_red);
toolbar.add(radio_green);
toolbar.add(radio_blue);
radio_red.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(e.getSource() instanceof JRadioButton){
if(e.getActionCommand()=="红色"){
text.setForeground(Color.red);
}
}
}
});
radio_green.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(e.getSource() instanceof JRadioButton){
if(e.getActionCommand()=="绿色"){
text.setForeground(Color.green);
}
}
}
});
radio_blue.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(e.getSource() instanceof JRadioButton){
if(e.getActionCommand()=="蓝色"){
text.setForeground(Color.blue);
}
}
}
});
popmenu = new JPopupMenu();
String popstr[] = {"剪切","复制","粘贴"};
JMenuItem popmenuitem[] = new JMenuItem[popstr.length];
for(int i = 0;i<popstr.length;i++)
{
popmenuitem[i] = new JMenuItem(popstr[i]);
popmenu.add(popmenuitem[i]);
popmenuitem[i].addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(e.getSource() instanceof JMenuItem){
if(e.getSource() instanceof JMenuItem){
if(e.getActionCommand() == "复制"){
text.copy();
}
if(e.getActionCommand() == "粘贴"){
text.paste();
}
if(e.getActionCommand() == "剪切"){
text.cut();
}
}
}
}
});
}
text.add(popmenu);
text.addMouseListener(new MouseListener(){
public void mouseClicked(MouseEvent e){
if(e.getModifiers() == MouseEvent.BUTTON3_MASK)
popmenu.show(text,e.getX(),e.getY());
}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}
public void mousePressed(MouseEvent e){}
public void mouseReleased(MouseEvent e){}
});
for(int i=0; i<str_size.length;i++){
jcb.addItem(str_size[i]);
jcb.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
if(e.getSource() instanceof JComboBox){
Font f = text.getFont();
try{
int i = Integer.parseInt((String) jcb.getSelectedItem());
text.setFont(new Font(f.getFontName(),f.getStyle(),i));
}catch(Exception ex){
JOptionPane.showMessageDialog(jf, "字号大小不合适，请重新输入");
jcb.setSelectedItem(String.valueOf(f.getSize()));
}
String size = (String) jcb.getSelectedItem();
int i = 0,n =jcb.getItemCount();
while(i<n
&&size.compareTo((String) jcb.getItemAt(i))>=0){
if(size.compareTo((String) jcb.getItemAt(i))==0)
return;
i++;
}
jcb.insertItemAt(size, i);
}
}
});
}
}
}