trackevent.java

Thinking in JAVA第四版源代码

//: gui/TrackEvent.java
// Show events as they happen.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import static net.mindview.util.SwingConsole.*;

public class TrackEvent extends JFrame {
  private HashMap<String,JTextField> h =
    new HashMap<String,JTextField>();
  private String[] event = {
    "focusGained", "focusLost", "keyPressed",
    "keyReleased", "keyTyped", "mouseClicked",
    "mouseEntered", "mouseExited", "mousePressed",
    "mouseReleased", "mouseDragged", "mouseMoved"
  };
  private MyButton
    b1 = new MyButton(Color.BLUE, "test1"),
    b2 = new MyButton(Color.RED, "test2");
  class MyButton extends JButton {
    void report(String field, String msg) {
      h.get(field).setText(msg);
    }
    FocusListener fl = new FocusListener() {
      public void focusGained(FocusEvent e) {
        report("focusGained", e.paramString());
      }
      public void focusLost(FocusEvent e) {
        report("focusLost", e.paramString());
      }
    };
    KeyListener kl = new KeyListener() {
      public void keyPressed(KeyEvent e) {
        report("keyPressed", e.paramString());
      }
      public void keyReleased(KeyEvent e) {
        report("keyReleased", e.paramString());
      }
      public void keyTyped(KeyEvent e) {
        report("keyTyped", e.paramString());
      }
    };
    MouseListener ml = new MouseListener() {
      public void mouseClicked(MouseEvent e) {
        report("mouseClicked", e.paramString());
      }
      public void mouseEntered(MouseEvent e) {
        report("mouseEntered", e.paramString());
      }
      public void mouseExited(MouseEvent e) {
        report("mouseExited", e.paramString());
      }
      public void mousePressed(MouseEvent e) {
        report("mousePressed", e.paramString());
      }
      public void mouseReleased(MouseEvent e) {
        report("mouseReleased", e.paramString());
      }
    };
    MouseMotionListener mml = new MouseMotionListener() {
      public void mouseDragged(MouseEvent e) {
        report("mouseDragged", e.paramString());
      }
      public void mouseMoved(MouseEvent e) {
        report("mouseMoved", e.paramString());
      }
    };
    public MyButton(Color color, String label) {
      super(label);
      setBackground(color);
      addFocusListener(fl);
      addKeyListener(kl);
      addMouseListener(ml);
      addMouseMotionListener(mml);
    }
  }
  public TrackEvent() {
    setLayout(new GridLayout(event.length + 1, 2));
    for(String evt : event) {
      JTextField t = new JTextField();
      t.setEditable(false);
      add(new JLabel(evt, JLabel.RIGHT));
      add(t);
      h.put(evt, t);
    }
    add(b1);
    add(b2);
  }
  public static void main(String[] args) {
    run(new TrackEvent(), 700, 500);
  }
} ///:~