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首页 > 解决方案 > 如何以编程方式确定不同键盘布局上“Ctrl + Plus”和“Ctrl + Minus”的正确击键？

java - 如何以编程方式确定不同键盘布局上“Ctrl + Plus”和“Ctrl + Minus”的正确击键？

问题描述

我正在尝试绑定Ctrl++和Ctrl+-来放大/缩小动作。

这个问题解释了在某些键盘布局上，+并且-存在于主要层上，而在其他键盘布局上它们存在于次要层上（您必须按修改键Shift来键入它）。另请参阅错误4262044和6942481。

目前看来我必须分析我想要支持的所有布局，并根据当前布局配置不同的击键绑定，例如：

import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.KeyStroke;
import javax.swing.WindowConstants;

public class KeyStrokeTest extends JFrame {
  public static void main(String[] args) throws Exception {

    JFrame frame = new JFrame();

    // en_US
    register(frame, "control shift EQUALS");
    register(frame, "control MINUS");

    // de_DE
    //    register(frame, "control PLUS");
    //    register(frame, "control MINUS");

    // de_CH
    //    register(frame, "control shift 1");
    //    register(frame, "control MINUS");

    frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    frame.setSize(200, 200);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
    frame.getRootPane().setFocusable(true);
    frame.getRootPane().requestFocusInWindow();
  }

  private static void register(JFrame frame, String keyStrokeDefinition) {
    KeyStroke keyStroke = KeyStroke.getKeyStroke(keyStrokeDefinition);
    String key = keyStrokeDefinition;
    frame.getRootPane().getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(keyStroke, key);
    frame.getRootPane().getActionMap().put(key, new TestAction(keyStrokeDefinition));
  }

  private static class TestAction extends AbstractAction {
    private String info;

    public TestAction(String info) {
      this.info = info;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
      System.out.println("Action performed: " + info);
    }
  }
}

+有没有办法以编程方式-为所有（或大多数）布局找出正确的击键？

在此处输入图像描述

标签： javaswingkeyboard-shortcutskeyboard-eventskeyboard-layout

解决方案

我不知道如何使用键绑定。

作为替代方案，您可以侦听所有 KeyEvent 并处理您的特定情况：

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

public class Control implements AWTEventListener
{
    private boolean isPressed;

    public Control()
    {
        long eventMask = AWTEvent.KEY_EVENT_MASK;
        Toolkit.getDefaultToolkit().addAWTEventListener( this , eventMask);
    }

    public void eventDispatched(AWTEvent e)
    {
        KeyEvent ke = (KeyEvent)e;

        if (ke.getKeyCode() == KeyEvent.VK_CONTROL)
            isPressed = e.getID() == KeyEvent.KEY_PRESSED;

        if (isPressed
        &&  e.getID() == KeyEvent.KEY_PRESSED
        &&  ke.getKeyChar() == '+')
            System.out.println("Zoom In");
    }

    private static void createAndShowGUI()
    {
        new Control();

        JTextField textField = new JTextField(20);
        textField.setFont( textField.getFont().deriveFont(24.0f) );

        JFrame frame = new JFrame("SSCCE");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add( textField );
        frame.pack();
        frame.setLocationByPlatform( true );
        frame.setVisible( true );
    }

    public static void main(String[] args) throws Exception
    {
        java.awt.EventQueue.invokeLater( () -> createAndShowGUI() );
    }
}

但是，它只适用于“+”而不是“-”。出于某种原因，Ctrl +“-”不会生成有效的键字符。

所以我的下一个尝试是尝试使用机器人使用不同的按键来查看生成了什么字符：

import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.lang.reflect.*;

public class KeyboardMap
{
    private HashMap<String, KeyStroke> keyStrokes = new HashMap<>();

    private JTextField textField = new JTextField(10);
    private Robot robot;

    public KeyboardMap()
    {
        // Create dummy dialog for usage by the Robot

        JDialog dialog = new JDialog();
//      dialog.setLocation(-200, -200);
        dialog.add( textField );
        dialog.pack();
        dialog.setVisible(true);

        try
        {
            robot = new Robot();
            robot.delay(32);

            ArrayList<Integer> keyCodes = getKeyCodes();

            for (Integer keyCode: keyCodes)
            {
                System.out.println(keyCode);
                generateCharacter(keyCode, false);
                generateCharacter(keyCode, true);
            }
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }

    }

    private ArrayList<Integer> getKeyCodes() throws Exception
    {
        ArrayList<Integer> keyCodes = new ArrayList<>();
        keyCodes.add( KeyEvent.VK_0 );
        keyCodes.add( KeyEvent.VK_1 );
        keyCodes.add( KeyEvent.VK_2 );
        keyCodes.add( KeyEvent.VK_3 );
        keyCodes.add( KeyEvent.VK_4 );
        keyCodes.add( KeyEvent.VK_5 );
        keyCodes.add( KeyEvent.VK_6 );
        keyCodes.add( KeyEvent.VK_7 );
        keyCodes.add( KeyEvent.VK_8 );
        keyCodes.add( KeyEvent.VK_9 );
//      keyCodes.add( KeyEvent.VK_PLUS );
//      keyCodes.add( KeyEvent.VK_ADD );
        keyCodes.add( KeyEvent.VK_EQUALS );
        keyCodes.add( KeyEvent.VK_MINUS );

        return keyCodes;
    }

    private ArrayList<Integer> getKeyCodes2() throws Exception
    {
        ArrayList<Integer> keyCodes = new ArrayList<>();

        Field[] fields = KeyEvent.class.getFields();

        for (Field field: fields)
        {
            if (field.getName().startsWith("VK_"))
            {
                int keyCode = field.getInt(null);
                System.out.println(keyCode + " : " + field.getName());

//              if (keyCode < 1000)
                if (field.getName().length() == 4)
                {
                    keyCodes.add( keyCode );
//                  System.out.println(field.getName());
                }
            }
        }

        return keyCodes;
    }

    private void generateCharacter(int keyCode, boolean useShift)
    {
        if (useShift) robot.keyPress( KeyEvent.VK_SHIFT );

        robot.keyPress( keyCode );
        robot.keyRelease( keyCode );

        if (useShift) robot.keyRelease( KeyEvent.VK_SHIFT );

        robot.delay(50);

        String text = textField.getText();
//      System.out.println(keyCode + " : " + useShift + " : " + text);
        textField.setText("");

        if (text.length() == 1)
        {
            int modifier = (useShift) ? KeyEvent.SHIFT_DOWN_MASK : 0;

            KeyStroke ks = KeyStroke.getKeyStroke(keyCode, modifier);

            keyStrokes.put(text, ks);
        }
    }

        public KeyStroke getKeyStroke(String character)
        {
            return keyStrokes.get(character);
        }

    public static void main(String[] args) throws Exception
    {
        KeyboardMap map = new KeyboardMap();
        System.out.println(map.getKeyStroke("0"));
        System.out.println(map.getKeyStroke(")"));
        System.out.println(map.getKeyStroke("1"));
        System.out.println(map.getKeyStroke("!"));
        System.out.println(map.getKeyStroke("+"));
        System.out.println(map.getKeyStroke("-"));
    }
}

然而，这种方法存在时间问题。我试图在各个步骤中添加延迟，这看起来确实很有帮助。

这两种方法都不能解决您的问题，但它可能会给您一些想法？

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