📄 keystrokesample.java

📁 The Definitive Guide to Java Swing, Third Edition by John Zukowski (Author) 源码

💻 JAVA

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

public class KeyStrokeSample {
  private static final String ACTION_KEY = "theAction";
  public static void main(String args[]) {
    Runnable runner = new Runnable() {
      public void run() {
        JFrame frame = new JFrame("KeyStroke Sample");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JButton buttonA =
          new JButton("<html><center>FOCUSED<br>control alt 7");
        JButton buttonB =
          new JButton("<html><center>FOCUS/RELEASE<br>VK_ENTER");
        JButton buttonC =
          new JButton("<html><center>ANCESTOR<br>VK_F4+SHIFT_MASK");
        JButton buttonD =
          new JButton("<html><center>WINDOW<br>' '");

        // Define ActionListener
        Action actionListener = new AbstractAction() {
          public void actionPerformed(ActionEvent actionEvent) {
            JButton source = (JButton)actionEvent.getSource();
            System.out.println("Activated: " + source.getText());
          }
        };

        KeyStroke controlAlt7 = KeyStroke.getKeyStroke("control alt 7");
        InputMap inputMap = buttonA.getInputMap();
        inputMap.put(controlAlt7, ACTION_KEY);
        ActionMap actionMap = buttonA.getActionMap();
        actionMap.put(ACTION_KEY, actionListener);

        KeyStroke enter = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, true);
        inputMap = buttonB.getInputMap();
        inputMap.put(enter, ACTION_KEY);
        buttonB.setActionMap(actionMap);

        KeyStroke shiftF4 =
          KeyStroke.getKeyStroke(KeyEvent.VK_F4, InputEvent.SHIFT_MASK);
        inputMap =
          buttonC.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
        inputMap.put(shiftF4, ACTION_KEY);
        buttonC.setActionMap(actionMap);

        KeyStroke space = KeyStroke.getKeyStroke(' ');
        inputMap = buttonD.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
        inputMap.put(space, ACTION_KEY);
        buttonD.setActionMap(actionMap);

        frame.setLayout(new GridLayout(2,2));
        frame.add(buttonA);
        frame.add(buttonB);
        frame.add(buttonC);
        frame.add(buttonD);

        frame.setSize(400, 200);
        frame.setVisible(true);
      }
    };
    EventQueue.invokeLater(runner);
  }
}

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