Question

如何为顶级特殊键定义键盘快捷键，例如德语变音键Ä？我找到了一种映射用于默认美国布局键的unicode字母的方法，请参阅here。但德国变音键Ä的关键事件是：

java.awt.event.KeyEvent[KEY_PRESSED,keyCode=0,keyText=Unknown keyCode: 0x0,keyChar='ä',keyLocation=KEY_LOCATION_STANDARD,rawCode=222,primaryLevelUnicode=228,scancode=40] on frame0

想法是注册键盘动作：

import java.awt.Dimension;
import java.awt.event.ActionEvent;

import javax.swing.AbstractAction;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;


public class KeyStrokeForGermanUmlaut {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JFrame frame = new JFrame();
                frame.setPreferredSize(new Dimension(600, 400));
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                JPanel panel = new JPanel();
                final JLabel label = new JLabel("Text shall change with shortcut");
                panel.add(label);
                panel.registerKeyboardAction(new AbstractAction() {
                    @Override
                    public void actionPerformed(ActionEvent event) {
                        label.setText("It is working!!!");
                    }
                }, KeyStroke.getKeyStroke("control typed Ä"), JComponent.WHEN_IN_FOCUSED_WINDOW);

                frame.getContentPane().add(panel);
                frame.pack();
                frame.setVisible(true);
            }
        });
    }
}

Answer 1

你可以召唤JLabel，没有任何关键事件发生
应该是将焦点移动到JFrames ContentPane的起点（可以用作JPanel，但与普通JPanel相比具有BorderLayout - FlowLayout）

-

import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;

public class KeyStrokeForGermanUmlaut {

    private JFrame frame = new JFrame();
    private JLabel label = new JLabel("Text shall change with shortcut");

    public KeyStrokeForGermanUmlaut() {
        frame.getRootPane().getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(
                KeyStroke.getKeyStroke(KeyEvent.VK_A, KeyEvent.CTRL_MASK), "CTRL + A");
        frame.getRootPane().getActionMap().put("CTRL + A", updateCol());
        frame.setPreferredSize(new Dimension(600, 100));
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(label);
        frame.pack();
        frame.setLocation(150, 150);
        frame.setVisible(true);
    }

    private Action updateCol() {
        return new AbstractAction("Hello World") {
            private static final long serialVersionUID = 1L;

            @Override
            public void actionPerformed(ActionEvent e) {
                label.setText(label.getText() + " presses");
            }
        };
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new KeyStrokeForGermanUmlaut();
            }
        });
    }
}

EDIT请参阅API getKeyStroke/ v.s. getKeyStrokeForEvent

中的说明

那么结果可能是（在这两个字符中使用修饰符SHIFT和大写形式（ä和ú）时会有一点点丢失，也许有人会帮助我们使用那些KeyEvents）

enter image description here

这

import java.awt.Dimension;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;

public class KeyStrokeForGermanUmlaut {

    private JFrame frame = new JFrame();
    private JLabel label = new JLabel("Text shall change with shortcut");

    public KeyStrokeForGermanUmlaut() {
        frame.getRootPane().getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(
                KeyStroke.getKeyStroke("typed ä"), "typed ä");
        frame.getRootPane().getActionMap().put("typed ä", updateCol());
        frame.getRootPane().getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(
                KeyStroke.getKeyStroke("typed ú"), "typed ú");
        frame.getRootPane().getActionMap().put("typed ú", updateCol1());
        frame.setPreferredSize(new Dimension(600, 100));
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(label);
        frame.pack();
        frame.setLocation(150, 150);
        frame.setVisible(true);
    }

    private Action updateCol() {
        return new AbstractAction("Hello World") {
            private static final long serialVersionUID = 1L;

            @Override
            public void actionPerformed(ActionEvent e) {
                label.setText(label.getText() + " presses - ä");
            }
        };
    }

    private Action updateCol1() {
        return new AbstractAction("Hello World") {
            private static final long serialVersionUID = 1L;

            @Override
            public void actionPerformed(ActionEvent e) {
                label.setText(label.getText() + " presses - ú");
            }
        };
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new KeyStrokeForGermanUmlaut();
            }
        });
    }
}

Answer 2

我担心在处理CTRL的修饰符时会出现一些问题。即：在检查接收到的键修饰符= InputEvent.CTRL_MASK时，扩展修饰符= InputEvent.CTRL_DOWN_MASK。 API的javadoc有点可疑。

除此之外，当省略“控制”时，Ä不是特殊情况。

为了使它工作，我不得不添加一个脏 hack：注册一个关键监听器，它调用动作本身。我必须监督一些事情。

对于其他人，我按预期使用了InputMap / ActionMap。输入映射似乎不起作用，但根据我的理解，如果添加到JTextField或其他答案（对于Ä），它不起作用。以下作品 - 以一种可怕的方式。

final JLabel label = new JLabel("Text shall change with shortcut");
final KeyStroke key = KeyStroke.getKeyStroke((Character)'k',
        InputEvent.CTRL_DOWN_MASK, false);
final Object actionKey = "auml";
final Action action = new AbstractAction() {
    @Override
    public void actionPerformed(ActionEvent event) {
        System.out.println("aha");
        label.setText("It is working!!!");
    }
};
label.addKeyListener(new KeyAdapter() {

    @Override
    public void keyPressed(java.awt.event.KeyEvent e) {
        if (e.isControlDown() && e.getKeyChar() == 'ä') {
            System.out.println("Ctrl-ä");
            label.getActionMap().get(actionKey).actionPerformed(null);
            // return;
        }
        super.keyPressed(e);
    }
});
label.getInputMap().put(key, actionKey);
label.getActionMap().put(actionKey, action);

Answer 3

Ä, \xC4, &#196;, &Auml;, %C4, %C3%84

Ä有代码。请尝试使用它，也许一个它们将为你工作。

如何在Java Swing中定义特殊键的快捷方式，例如德国变音键Ä？

3 个答案: