Java Swing KeyStrokes：如何使 CTRL 修饰符起作用
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Java Swing KeyStrokes: how to make CTRL-modifier work
提问by Thomas
In the following program, why does hitting the akey print "hello, world"while hitting CTRL+adoesn't?
在下面的程序中，为什么a按键打印“hello, world”而按CTRL+a不打印？
import java.awt.event.*;
import javax.swing.*;
public class KeyStrokeTest {
public static void main(String[] args) {
JPanel panel = new JPanel();
/* add a new action named "foo" to the panel's action map */
panel.getActionMap().put("foo", new AbstractAction() {
public void actionPerformed(ActionEvent e) {
System.out.println("hello, world");
}
});
/* connect two keystrokes with the newly created "foo" action:
- a
- CTRL-a
*/
InputMap inputMap = panel.getInputMap();
inputMap.put(KeyStroke.getKeyStroke(Character.valueOf('a'), 0), "foo");
inputMap.put(KeyStroke.getKeyStroke(Character.valueOf('a'), InputEvent.CTRL_DOWN_MASK), "foo");
/* display the panel in a frame */
JFrame frame = new JFrame();
frame.getContentPane().add(panel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 400);
frame.setVisible(true);
}
}
How could I fix it that CTRL+aworks as well?
我怎样才能修复它，CTRL+ 也能a正常工作？
采纳答案by camickr
I find it easier to use:
我发现它更易于使用：
KeyStroke a = KeyStroke.getKeyStroke("A");
KeyStroke controlA = KeyStroke.getKeyStroke("control A");
or:
或者：
KeyStroke controlA = KeyStroke.getKeyStroke(KeyEvent.VK_A, InputEvent.CTRL_MASK);
回答by bragboy
Dude, use this
哥们，用这个
inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_A, InputEvent.CTRL_MASK), "foo");
回答by SOA Nerd
Yep, the above code will work.
是的，上面的代码会起作用。
Big picture - Ctrl+aand aare read as different keystrokes the same as aand bwould be different.
大图 -Ctrl+a和a被解读为不同的击键一样a并且b会有所不同。
