201771010121 唐月晨 实验十三 图形界面事件处理技术

package button;

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

/**
 * A frame with a button panel
 */
public class ButtonFrame extends JFrame
{
   private JPanel buttonPanel;
   //设置框架的长宽
   private static final int DEFAULT_WIDTH = 300;
   private static final int DEFAULT_HEIGHT = 200;

   public ButtonFrame()
   {      
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
      
      
      
      /*//生成按钮对象
      JButton yellowButton = new JButton("Yellow");
      JButton blueButton = new JButton("Blue");
      JButton redButton = new JButton("Red");*/

      buttonPanel = new JPanel();//创建JPanel内容对象

     /* //add方法将三个按钮组件添加到面板上去
      buttonPanel.add(yellowButton);
      buttonPanel.add(blueButton);
      buttonPanel.add(redButton);
     */
      // add panel to frame
      add(buttonPanel);//把按钮添加到框架里
      
      
      //生成三个监听器类对象；颜色值在Color类里都是静态常熟值
    /* ColorAction yellowAction = new ColorAction(Color.YELLOW);
      ColorAction blueAction = new ColorAction(Color.BLUE);
      ColorAction redAction = new ColorAction(Color.RED);*/

  
      //监听器对象和组件之间的注册机制；只有注册了监听器类对象的组件才是事件源。
     /* yellowButton.addActionListener(yellowAction);
      blueButton.addActionListener(blueAction);
      redButton.addActionListener(redAction);
     */
      makeButton("black",Color.black);
      makeButton("white",Color.white);
      makeButton("pink",Color.pink);
      makeButton("gray",Color.gray);
   }

   /**
    * An action listener that sets the panel‘s background color.
    */
  /* private class ColorAction implements ActionListener//定义一个监听器类
   {
      private Color backgroundColor;

      public ColorAction(Color c)
      {
         backgroundColor = c;
      }

      public void actionPerformed(ActionEvent event)//监听按钮
      {
         buttonPanel.setBackground(backgroundColor);
      }
   }*/
   
   
       public void makeButton(String name,Color backgroundColor)
       {
           JButton button = new JButton(name);//用字符串构造按钮对象
           buttonPanel.add(button);//把按钮添加到面板上
           /*ColorAction action = new ColorAction(backgroundColor);//用对应颜色构造一个监听器
           button.addActionListener(action);//注册监听器*/
           new ActionListener()
                   {
               public void actionPerformed(ActionEvent event)//就可以省掉显示的监听器类
               {
                   buttonPanel.setBackground(backgroundColor);
               }
                   };
       }
           
}
ButtonFrame

package button;

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

/**
 * @version 1.34 2015-06-12
 * @author Cay Horstmann
 */
public class ButtonTest
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(() -> {
         JFrame frame = new ButtonFrame();//生成一个GUI界面类对象Frame
         frame.setTitle("ButtonTest");//左上方文字
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//关闭按钮退出界面
         frame.setVisible(true);//Visible属性为真，使界面可视化
      });
   }
}

package button;

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

/**
 * A frame with a button panel
 */
public class ButtonFrame extends JFrame {
    private JPanel buttonPanel;// 该类对象属性
    private static final int DEFAULT_WIDTH = 300;
    private static final int DEFAULT_HEIGHT = 200;

    public ButtonFrame() {
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);// 通过setsize来更改框架的宽度和高度

        buttonPanel = new JPanel();

        add(buttonPanel);

        makeButton("yellow", Color.yellow);
        makeButton("blue", Color.blue);
        makeButton("red", Color.red);
        makeButton("green", Color.green);// 添加一个新的组件只需要该条语句
    }

    public void makeButton(String name, Color backgroundColor) {
        JButton button = new JButton(name);
        buttonPanel.add(button);
        button.addActionListener((e) -> {
            buttonPanel.setBackground(backgroundColor);
        });

    }

}

package plaf;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

/**
 * A frame with a button panel for changing look-and-feel
 */
public class PlafFrame extends JFrame
{
   private JPanel buttonPanel;

   public PlafFrame()
   {
      buttonPanel = new JPanel();

      UIManager.LookAndFeelInfo[] infos = UIManager.getInstalledLookAndFeels();//列举安装的所有观感器实现
      for (UIManager.LookAndFeelInfo info : infos)
         makeButton(info.getName(), info.getClassName());//返回观感的显示名称和观感实现类的名称

      add(buttonPanel);//把按钮添加到框架里
      pack();
   }

   /**
    * Makes a button to change the pluggable look-and-feel.
    * @param name the button name
    * @param className the name of the look-and-feel class
    */
   private void makeButton(String name, String className)//用辅助方法makeButton和匿名内部类指定按钮动作，即切换观感
   {
      // add button to panel

      JButton button = new JButton(name);
      buttonPanel.add(button);//把按钮添加到面板上

      // set button action

      button.addActionListener(event -> {
         // button action: switch to the new look-and-feel
         try
         {
            UIManager.setLookAndFeel(className);
            SwingUtilities.updateComponentTreeUI(this);//this指示外围对象
            pack();
         }
         catch (Exception e)
         {
            e.printStackTrace();
         }
      });
   }
}

package plaf;

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

/**
 * @version 1.32 2015-06-12
 * @author Cay Horstmann
 */
public class PlafTest
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(() -> {
         JFrame frame = new PlafFrame();
         frame.setTitle("PlafTest");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
      });
   }
}

package action;

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

/**
 * A frame with a panel that demonstrates color change actions.
 */
public class ActionFrame extends JFrame
{
   private JPanel buttonPanel;
   private static final int DEFAULT_WIDTH = 300;
   private static final int DEFAULT_HEIGHT = 200;

   public ActionFrame()
   {
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

      buttonPanel = new JPanel();

      // define actions
      //创建自己定义的ColorAction对象

      Action yellowAction = new ColorAction("Yellow", new ImageIcon("yellow-ball.gif"),
            Color.YELLOW);
      Action blueAction = new ColorAction("Blue", new ImageIcon("blue-ball.gif"), Color.BLUE);
      Action redAction = new ColorAction("Red", new ImageIcon("red-ball.gif"), Color.RED);

      // add buttons for these actions
    //创建一个按钮，其属性从所提供的 Action中获取
      buttonPanel.add(new JButton(yellowAction));
      buttonPanel.add(new JButton(blueAction));
      buttonPanel.add(new JButton(redAction));

      // add panel to frame
      
      add(buttonPanel);

      // associate the Y, B, and R keys with names
      InputMap imap = buttonPanel.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);//当该组件包含了拥有键盘焦点的组件时
      //将动作与击键关联起来，调用KeyStroke类的静态getKeyStroke方法
      imap.put(KeyStroke.getKeyStroke("ctrl Y"), "panel.yellow");
      imap.put(KeyStroke.getKeyStroke("ctrl B"), "panel.blue");
      imap.put(KeyStroke.getKeyStroke("ctrl R"), "panel.red");

      // associate the names with actions
      //键与动作关联
      ActionMap amap = buttonPanel.getActionMap();//返回关联动作映射键和动作对象的映射
      amap.put("panel.yellow", yellowAction);
      amap.put("panel.blue", blueAction);
      amap.put("panel.red", redAction);
   }
   
   public class ColorAction extends AbstractAction
   {
      /**
       * Constructs a color action.
       * @param name the name to show on the button
       * @param icon the icon to display on the button
       * @param c the background color
       */
      public ColorAction(String name, Icon icon, Color c)
      {//将与名字关联的对象放置在动作对象内
         putValue(Action.NAME, name);
         putValue(Action.SMALL_ICON, icon);
         putValue(Action.SHORT_DESCRIPTION, "Set panel color to " + name.toLowerCase());
         putValue("color", c);
      }

      public void actionPerformed(ActionEvent event)//执行改变颜色的动作
      {
         Color c = (Color) getValue("color");//返回被存储的对象的值
         buttonPanel.setBackground(c);
      }
   }
}

package action;

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

/**
 * @version 1.34 2015-06-12
 * @author Cay Horstmann
 */
public class ActionTest
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(() -> {
         JFrame frame = new ActionFrame();
         frame.setTitle("ActionTest");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
      });
   }
}

package mouse;

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

/**
 * A component with mouse operations for adding and removing squares.
 */
public class MouseComponent extends JComponent
{
   private static final int DEFAULT_WIDTH = 300;
   private static final int DEFAULT_HEIGHT = 200;

   private static final int SIDELENGTH = 100;//鼠标点击形成的方框边长
   private ArrayList<Rectangle2D> squares;
   private Rectangle2D current; // the square containing the mouse cursor

   public MouseComponent()
   {
      squares = new ArrayList<>();
      current = null;

      addMouseListener(new MouseHandler());
      addMouseMotionListener(new MouseMotionHandler());
   }

   public Dimension getPreferredSize() { return new Dimension(DEFAULT_WIDTH, DEFAULT_HEIGHT); }   
   
   public void paintComponent(Graphics g)
   {
      Graphics2D g2 = (Graphics2D) g;

      // draw all squares
      for (Rectangle2D r : squares)
         g2.draw(r);
   }

   /**
    * Finds the first square containing a point.
    * @param p a point
    * @return the first square that contains p
    */
   public Rectangle2D find(Point2D p)
   {
      for (Rectangle2D r : squares)
      {
         if (r.contains(p)) return r;
      }
      return null;
   }

   /**
    * Adds a square to the collection.
    * @param p the center of the square
    */
   public void add(Point2D p)
   {
      double x = p.getX();
      double y = p.getY();

      current = new Rectangle2D.Double(x - SIDELENGTH / 2, y - SIDELENGTH / 2, SIDELENGTH,
            SIDELENGTH);
      squares.add(current);
      repaint();
   }

   /**
    * Removes a square from the collection.
    * @param s the square to remove
    */
   public void remove(Rectangle2D s)
   {
      if (s == null) return;
      if (s == current) current = null;
      squares.remove(s);
      repaint();
   }

   //当鼠标被按下时调用三个监听器方法
   private class MouseHandler extends MouseAdapter
   {
      public void mousePressed(MouseEvent event)//鼠标第一次被按下时调用mousePressed
      {
         // add a new square if the cursor isn‘t inside a square
          //当鼠标点击在所有小方块的像素之外时，就会绘制一个新的小方块
         current = find(event.getPoint());
         if (current == null) add(event.getPoint());
      }

      public void mouseClicked(MouseEvent event)//用mouseEvent类对象作为参数，调用getX和getY方法可以获得鼠标被按下时鼠标指针所在的x和y坐标
      {
         // remove the current square if double clicked
          //如果用户在某个小方块中双击鼠标，就会将它擦除
         current = find(event.getPoint());
         if (current != null && event.getClickCount() >= 2) remove(current);
      }
   }

   private class MouseMotionHandler implements MouseMotionListener
   {
      public void mouseMoved(MouseEvent event)
      {
         // set the mouse cursor to cross hairs if it is inside
         // a rectangle

         if (find(event.getPoint()) == null) setCursor(Cursor.getDefaultCursor());
         else setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));//光标位于一个小方块之上时变成另一种形状
      }

      public void mouseDragged(MouseEvent event)
      {
         if (current != null)
         {
            int x = event.getX();
            int y = event.getY();

            // drag the current rectangle to center it at (x, y)
           // 获得x,y绘图
            current.setFrame(x - SIDELENGTH / 2, y - SIDELENGTH / 2, SIDELENGTH, SIDELENGTH);
            repaint();//重新绘制
         }
      }
   }   
}

package mouse;

import javax.swing.*;

/**
 * A frame containing a panel for testing mouse operations
 */
public class MouseFrame extends JFrame
{
   public MouseFrame()
   {
      add(new MouseComponent());//向框架中添加一个JComponent的实例
      pack();
   }
}

package mouse;

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

/**
 * @version 1.34 2015-06-12
 * @author Cay Horstmann
 */
public class MouseTest
{
   public static void main(String[] args)
   {
      EventQueue.invokeLater(() -> {
         JFrame frame = new MouseFrame();
         frame.setTitle("MouseTest");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         frame.setVisible(true);
      });
   }
}

package 点名器;

import java.util.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.File;
import java.io.FileNotFoundException;

import javax.swing.event.*;
public class NameFrame extends JFrame implements ActionListener{
    //分别定义JLabel、JButton、boolean点名器为私有属性
    private JLabel jla;
    private JLabel jlb;
    private JButton jba;
    private static boolean flag = true;
    public NameFrame(){
        this.setLayout(null);//设置 LayoutManager。重写此方法，从而有条件地将调用转发到 contentPane
      
        jla = new JLabel("姓名");//创建具有指定文本的 JLabel 实例，指定文本即“姓名”
        jlb = new JLabel("准备中");
        jba = new JButton("开始");//创建一个带文本的按钮。文本即“开始”
        this.add(jla);//将指定组件追加到此容器的尾部。
        this.add(jlb);
        //姓名组件相关设置
        jla.setFont(new Font("Courier",Font.PLAIN,22));//设置组件字体，根据指定名称、样式和磅值大小，创建一个新 Font。
        jla.setHorizontalAlignment(JLabel.LEFT);//设置标签内容沿 X 轴的对齐方式。 这是一个 JavaBeans 绑定属性。
         jla.setVerticalAlignment(JLabel.CENTER);//设置标签内容沿 Y 轴的对齐方式        
         jla.setBounds(70,100,180,30);//移动组件并调整其大小。由 x 和 y 指定左上角的新位置，由 width 和 height 指定新的大小。 
         jlb.setOpaque(true);//如果为 true，则该组件绘制其边界内的所有像素。否则该组件可能不绘制部分或所有像素，从而允许其底层像素透视出来。 
        //准备中组件的相关设置
         jlb.setBackground(Color.pink);
         jlb.setFont(new Font("Courier",Font.PLAIN,22));
        jlb.setHorizontalAlignment(JLabel.CENTER);
         jlb.setVerticalAlignment(JLabel.CENTER);        
         jlb.setBounds(150,100,120,30);
          
         this.add(jba);
         jba.setBounds(150,150,80,26);
      
         jba.addActionListener(this);

         this.setTitle("点名器");
        this.setBounds(400,400,400,300);
        this.setVisible(true);//显示可视化
        this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
    }
    public void actionPerformed(ActionEvent e){//指示发生了组件定义的动作的语义事件
        int i=0;
        String names[]=new String[50];
        try {
            Scanner in=new Scanner(new File("I:\\大二上\\Java\\studentnamelist.txt"));
            while(in.hasNextLine())//如果在此扫描器的输入中存在另一行，则返回 true
            {
                names[i]=in.nextLine();
                i++;
            }
        } catch (FileNotFoundException e1) {//打开文件失败时抛出异常
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        if(jba.getText()=="开始"){
            jlb.setBackground(Color.PINK);
            flag = true;
            new Thread(){   
                public void run(){
                    while(NameFrame.flag){
                    Random r = new Random(); //创建一个新的随机数生成器
                    int i= r.nextInt(47);//返回一个伪随机数
                    jlb.setText(names[i]);
                    }
                }
            }.start();
            jba.setText("停止");//设置按钮为：停止
            jba.setBackground(Color.PINK);
        }    
        else if(jba.getText()=="停止"){//返回停止按钮
            flag = false;
            jba.setText("开始");
            jba.setBackground(Color.WHITE);
            jlb.setBackground(Color.pink);
        }
     }
    public static void main(String arguments []){ 
        new NameFrame();
    }
}