dialogexample.java

对话框的例子 对话框的例子 对话框的例子

import java.awt.*;
   import java.awt.event.*;
   import javax.swing.JTextArea;
   class FontDialog extends Dialog implements ItemListener,ActionListener   {
       Choice list;
       JTextArea text;
       Font font;
       Button yes,cancel;
       Component com;
       FontDialog(Frame f,String name,Component com)  {
           super(f,name);
           this.com=com;
           //super(f,name,true);
           setModal(true);       //将对话框设置为有模式
           yes=new Button("Yes");
           cancel=new Button("Cancel");
           yes.addActionListener(this);
           cancel.addActionListener(this);
           text=new JTextArea(2,25);
           list=new Choice();
           GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();
           String fontName[]=ge.getAvailableFontFamilyNames();
           for(int i=0;i<fontName.length;i++)
                list.add(fontName[i]);
           list.addItemListener(this);
           setLayout(new FlowLayout());
           add(list);
           add(text);
           add(yes);
           add(cancel);
           setBounds(100,100,280,170);
           addWindowListener(new WindowAdapter()
                {
                      public void windowClosing(WindowEvent e)
                      {
                            setVisible(false);
                       }
                 }
            );
           validate();
           }
           
           
           public void itemStateChanged(ItemEvent e)   {
                String name=(String)list.getSelectedItem();
                font=new Font(name,Font.PLAIN,14);
                text.setFont(font);
                text.setText("hello,奥运");
           }
           public void actionPerformed(ActionEvent e)   {
                 if(e.getSource()==yes)  {
                       com.setFont(font);
                       this.setVisible(true);         //将对话框设置为可见
                  }
                 else if(e.getSource()==cancel)  {
                       this.setVisible(false);           //将对话框设置为不可见
                  }
           }
       }
       class Dwindow extends Frame implements ActionListener   {
            JTextArea text;
            Button buttonFont;
            Dwindow()   {
                 buttonFont=new Button("设置字体");
                 text=new JTextArea("显示内容");
                 buttonFont.addActionListener(this);
                 add(buttonFont,BorderLayout.NORTH);
                 add(text);
                 setBounds(60,60,300,300);
                 setVisible(true);
                 validate();
                 addWindowListener(new WindowAdapter()     {
                            public void windowClosing(WindowEvent e)    {
                                 System.exit(0);
                            }
                       }
                  );
            }
            public void actionPerformed(ActionEvent e)  {
                 if(e.getSource()==buttonFont)   {
                      FontDialog dialog=new FontDialog(new Dwindow(),"字体对话框",text);          
                       //创建对话框，并将当前窗口、字符串“字体对话框”以及text传递给构造方法的参数
                      dialog.setVisible(true); 
                                   //将对话框dialog设置为可见
                 }
        }
   }
   public class DialogExample  {
        public static void main(String[] args)   {
              new Dwindow();
        }      
   }