KeyEvent侦听器中的多个键

Question

我想知道如何在一个键事件中按下所有的键。例如，我想为Ctrl+F编写一个监听器，它可以切换全屏。如何检查在一个事件中是否同时按下了Ctrl和F？

Answer 1

老实说，KeyListener有许多限制，而且使用起来很麻烦(IMHO)，相反，我只想利用密钥绑定API，它通常为重新使用提供了更大的灵活性和潜力。

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.InputEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class KeyListenerTest {

    public static void main(String[] args) {
        new KeyListenerTest();
    }

    public KeyListenerTest() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        private JLabel lbl;
        private boolean fullScreen = false;

        public TestPane() {
            lbl = new JLabel("Normal");
            setLayout(new GridBagLayout());
            add(lbl);

            InputMap im = getInputMap(WHEN_IN_FOCUSED_WINDOW);
            ActionMap am = getActionMap();

            im.put(KeyStroke.getKeyStroke(KeyEvent.VK_F, InputEvent.CTRL_DOWN_MASK), "FullScreen");
            am.put("FullScreen", new AbstractAction() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    if (fullScreen) {
                        lbl.setText("Normal");
                    } else {
                        lbl.setText("Full Screen");
                    }
                    fullScreen = !fullScreen;
                }
            });

        }

    }

}

为了让您不要认为我完全有偏见，这里有一个使用KeyListener······

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.InputEvent;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class KeyListenerTest {

    public static void main(String[] args) {
        new KeyListenerTest();
    }

    public KeyListenerTest() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        private JLabel lbl;
        private boolean fullScreen = false;

        public TestPane() {
            lbl = new JLabel("Normal");
            setLayout(new GridBagLayout());
            add(lbl);

            setFocusable(true);
            addMouseListener(new MouseAdapter() {

                @Override
                public void mouseClicked(MouseEvent e) {
                    requestFocusInWindow();
                }

            });

            addKeyListener(new KeyAdapter() {

                @Override
                public void keyPressed(KeyEvent e) {
                    if (e.getKeyCode() == KeyEvent.VK_F && e.isControlDown()) {
                        if (fullScreen) {
                            lbl.setText("Normal");
                        } else {
                            lbl.setText("Full Screen");
                        }
                        fullScreen = !fullScreen;
                    }
                }

            });
        }
    }
}