java swing学习笔记二，画布Canvas

/**

* 画布

* @time 11:23:53 AM

* @author retacn yue

* @Email zhenhuayue@sina.com

*/

public class Test_MyCanvas implements KeyListener, MouseInputListener {

Canvas c;// 画布

TextField tf;// 用于显示提示信息的文本框

String s; // 用于存放按键信息的字符串

public static void main(String[] args) {

// 初始化帧

Frame frame = new Frame("Canvas");

// 初始化画布

Test_MyCanvas test_MyCanvas = new Test_MyCanvas();

test_MyCanvas.c = new Canvas();

test_MyCanvas.tf = new TextField();

frame.add("South", test_MyCanvas.tf);

frame.add("Center", test_MyCanvas.c);

frame.setSize(300, 150);

test_MyCanvas.c.addMouseListener(test_MyCanvas);

test_MyCanvas.c.addKeyListener(test_MyCanvas);

frame.setVisible(true);

}

// 按键按下

public void keyPressed(KeyEvent e) {

}

// 按键抬起

public void keyReleased(KeyEvent e) {

tf.setText("keyReleased");

}

// 响应键盘事件

public void keyTyped(KeyEvent e) {

tf.setText("keyTyped");

s += e.getKeyChar();

c.getGraphics().drawString(s, 0, 20);

}

// 鼠标点击

public void mouseClicked(java.awt.event.MouseEvent e) {

tf.setText("mouseClicked");

// 画布取得焦点

c.requestFocus();

}

// 鼠标进入

public void mouseEntered(java.awt.event.MouseEvent e) {

tf.setText("mouseEntered");

}

// 鼠标退出

public void mouseExited(java.awt.event.MouseEvent e) {

tf.setText("mouseExited");

}

// 鼠标按下

public void mousePressed(java.awt.event.MouseEvent e) {

tf.setText("mousePressed");

}

// 鼠标松开

public void mouseReleased(java.awt.event.MouseEvent e) {

tf.setText("mouseReleased");

}

public void mouseDragged(java.awt.event.MouseEvent e) {

}

public void mouseMoved(java.awt.event.MouseEvent e) {

}

}