java 上下键_用键盘的上下左右键控制JAVA SWING UI中的组件的移动等事件

用键盘的上下左右键控制JAVA SWING UI中的组件的移动等事件

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class TestImage {
public static void main(String[] args)

{
new TestFrame();

}

}

class TestFrame extends JFrame

{
CheckboxGroup group = new CheckboxGroup();

Checkbox[] chk = new Checkbox[4];

int current = 0, temp = 0;

ChkListener l = new ChkListener();

TestFrame()

{
chk[0] = new Checkbox("A", group, true);

chk[1] = new Checkbox("B", group, false);

chk[2] = new Checkbox("C", group, false);

chk[3] = new Checkbox("D", group, false);

//this.setLayout(new GridLayout(2, 2));

this.getContentPane().setLayout(new GridLayout(2, 2));

for (int i = 0; i < chk.length; i++) {
chk[i].addItemListener(l);

//add(chk[i]);

this.getContentPane().add(chk[i]);

}

Toolkit.getDefaultToolkit().addAWTEventListener(new AWTEventListener() {
public void eventDispatched(AWTEvent e) {
if (((KeyEvent)e).getID() == 401)

myAction(((KeyEvent) e).getKeyCode());

}

}, AWTEvent.KEY_EVENT_MASK);

this.setSize(500, 400);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setVisible(true);

}

class ChkListener implements ItemListener

{
public void itemStateChanged(ItemEvent e)

{
current = (int)(group.getSelectedCheckbox().getLabel().charAt(0)) - (int)'A';

}

}

public void myAction(int currentSelect)

{
switch (currentSelect)

{
case KeyEvent.VK_DOWN:

case KeyEvent.VK_UP:

current = (current + 2) % 4;

group.setSelectedCheckbox(chk[current]);

break;

case KeyEvent.VK_LEFT:

case KeyEvent.VK_RIGHT:

current = current < 2 ? current = (current + 1) % 2 : (current + 1 > 3 ? 2 : 3);

group.setSelectedCheckbox(chk[current]);

break;

case KeyEvent.VK_ENTER:

JFrame frame = new JFrame("You selection is: " + group.getSelectedCheckbox().getLabel());

frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

frame.setSize(300, 200);

frame.setVisible(true);

}

}

}
————————————————
版权声明：本文为CSDN博主「郑培凯」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/weixin_30649293/article/details/114215466