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？

Question

我正在尝试绑定(bind) Ctrl + + 和 Ctrl + - 来放大/缩小操作.

这个question解释说，在某些键盘布局上， + 和 - 存在于主层上，而在其他键盘布局上，它们存在于辅助层上(您必须按 Shift 来输入)。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按键绑定(bind)，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找出所有(或大多数)布局的 + 和 - 的正确击键？

Answer 1

这包括通过任何方式输入“加号”，包括按下 CTRL 或 CTRL SHIFT:

register(f, "control MINUS");
register(f, "control SUBTRACT"); // minus on the numpad
// this covers typing a 'plus' by any means which include pressing down CTRL or CTRL SHIFT
f.getRootPane().addKeyListener(new KeyAdapter() {
    @Override
    public void keyPressed(KeyEvent evt) {
        String name = "control (shift) +";
        int mods = evt.getModifiersEx();
        if (mods == KeyEvent.CTRL_DOWN_MASK
                || mods == (KeyEvent.CTRL_DOWN_MASK | KeyEvent.SHIFT_DOWN_MASK)) {
            if (evt.getKeyChar() == '+') {
                System.out.println("Action performed: " + name);
            }
        }
    }
});