201771010108-韩腊梅-第十三周学习总结(代码片段)

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();//创建对象
         frame.setTitle("ButtonTest");//编写图形界面的题目
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//关闭用户图形界面操作
         frame.setVisible(true);//让图形界面可见
      );
   

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;
   private static final int DEFAULT_WIDTH = 300;//定义用户界面的宽度
   private static final int DEFAULT_HEIGHT = 200;//定义用户界面的高度

   public ButtonFrame()
         
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

      // 通过在按钮构造器中指定一个标签字符串、一个图标 或两项都指定来创建一个按钮，下面的三个按钮都是如此  
      JButton yellowButton = new JButton("Yellow");
      JButton blueButton = new JButton("Blue");
      JButton redButton = new JButton("Red");

      buttonPanel = new JPanel();

      // add buttons to panel
      buttonPanel.add(yellowButton);
      buttonPanel.add(blueButton);
      buttonPanel.add(redButton);

      // add panel to frame
      add(buttonPanel);

      // 为每个颜色构造一个对象
      ColorAction yellowAction = new ColorAction(Color.YELLOW);
      ColorAction blueAction = new ColorAction(Color.BLUE);
      ColorAction redAction = new ColorAction(Color.RED);

      // 调用add方法将按钮添加到面板上
      yellowButton.addActionListener(yellowAction);
      blueButton.addActionListener(blueAction);
      redButton.addActionListener(redAction);
   

   /**
    * An action listener that sets the panel‘s background color.
    */
   private class ColorAction implements ActionListener//颜色储存在监听器类中
   
      private Color backgroundColor;

      public ColorAction(Color c)
      
         backgroundColor = c;
      

      public void actionPerformed(ActionEvent event)//
      
         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实现
      for (UIManager.LookAndFeelInfo info : infos)//得到每一种观感的名字和类名
         makeButton(info.getName(), info.getClassName());

      add(buttonPanel);
      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
    */
//使用辅助方法makeButton和匿名内部类指定按钮动作，即切换观感
   private void makeButton(String name, String className)
   
      // add button to panel

      JButton button = new JButton(name);
      buttonPanel.add(button);

      // set button action

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

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;//定义宽度
   private static final int DEFAULT_HEIGHT = 200;//定义高度

   public ActionFrame()
   
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

      buttonPanel = new JPanel();
//创建类的三个对象
      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
      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);
      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
      ActionMap amap = buttonPanel.getActionMap();
      amap.put("panel.yellow", yellowAction);
      amap.put("panel.blue", blueAction);
      amap.put("panel.red", redAction);
   
   //将颜色储存在AbstractAction类提供的名值对表中
   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)
      
         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)
      
         Color c = (Color) getValue("color");
         buttonPanel.setBackground(c);
      
   

package mouse;

import javax.swing.*;

/**
 * A frame containing a panel for testing mouse operations
 */
public class MouseFrame extends JFrame

   public MouseFrame()
   
      add(new MouseComponent());
      pack();
   

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;//定义宽度
   private static final int DEFAULT_HEIGHT = 200;//定义高度

   private static final int SIDELENGTH = 10;
   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();
   

   private class MouseHandler extends MouseAdapter
   
      public void mousePressed(MouseEvent event)
      
         // 如果光标不在方块像素上则添加一个方块
         current = find(event.getPoint());
         if (current == null) add(event.getPoint());
      

      public void mouseClicked(MouseEvent event)
      
         //双击删除方框
         current = find(event.getPoint());
         if (current != null && event.getClickCount() >= 2) remove(current);
      
   

   private class MouseMotionHandler implements MouseMotionListener
   
      public void mouseMoved(MouseEvent event)
      
         // 如果光标位于矩形框内，则将光标设置为十字
         // a rectangle

         if (find(event.getPoint()) == null) setCursor(Cursor.getDefaultCursor());
         else setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
      

      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)
            current.setFrame(x - SIDELENGTH / 2, y - SIDELENGTH / 2, SIDELENGTH, SIDELENGTH);
            repaint();