java的键盘事件
时间:2011-06-19 BlogJava zht
最近看到有人问怎么模拟钢琴操作
想了想怎么实现 顺便看了下键盘事件
可以用两种方式
1、
public class KeystrokeTest extends JApplet {
private JButton button = new JButton("button");
public void init() {
Container contentPane = getContentPane();
JPanel panel = new JPanel();
JCheckBox checkbox = new JCheckBox("checkbox");
JButton southButton = new JButton("south button");
Listener listener = new Listener();
panel.setBorder(BorderFactory
.createTitledBorder(("Ancestor of button and checkbox")));
checkbox.registerKeyboardAction(listener, KeyStroke.getKeyStroke (
KeyEvent.VK_F, 0, false), JComponent.WHEN_FOCUSED);
panel.registerKeyboardAction(listener, KeyStroke.getKeyStroke (
KeyEvent.VK_A, InputEvent.ALT_MASK, false),
JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
southButton.registerKeyboardAction(listener, KeyStroke.getKeyStroke(
KeyEvent.VK_W, 0, true), JComponent.WHEN_IN_FOCUSED_WINDOW);
panel.add(button);
panel.add(checkbox);
contentPane.add(panel, "Center");
contentPane.add(southButton, "South");
}
}
class Listener implements ActionListener {
public void actionPerformed(ActionEvent e) {
Object src = e.getSource();
String cname = src.getClass().getName();
if (src instanceof JCheckBox) {
System.out.print("''f'' key PRESSED when checkbox");
System.out.println(" had focus");
} else if (src instanceof JPanel) {
System.out.print("''ALT-a'' key PRESSED when ancestor");
System.out.println(" of titled panel had focus");
} else if (src instanceof JButton) {
System.out.print("''w'' key RELEASED when any");
System.out.println(" component in window had focus");
}
System.out.println("Source: " + cname);
System.out.println();
}
}
javaμ??ü?ìê??t(2)
ê±??:2011-06-19 BlogJava zht
2?￠
public class T {
public static void main(String[] args) {
?? try {
?? UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName ());
?? } catch (Exception e) {
?? }
?? final JTextField tf = new JTextField();
?? tf.setEnabled(false);
?? JPanel p = new JPanel(new GridLayout(0, 3, 5, 5));
?? for (int i = 0; i <= 9; i++) {
?? final JButton btn = new JButton(String.valueOf(i));
?? p.add(btn);
?? btn.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(
???? KeyStroke.getKeyStroke((char) (i + ''0'')), "PressKeyAction");
?? btn.getActionMap().put("PressKeyAction", new AbstractAction() {
???? public void actionPerformed(ActionEvent e) {
???? btn.doClick();
???? }
?? });
?? btn.addActionListener(new ActionListener() {
???? public void actionPerformed(ActionEvent e) {
???? tf.setText(tf.getText() + btn.getText());
???? }
?? });
?? }
?? JFrame f = new JFrame();
?? JComponent contentPane = (JComponent) f.getContentPane();
?? contentPane.setLayout(new BorderLayou
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