我有一个Java应用程序,我想等待按下某个键来执行其他操作。直到现在我发现:
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_RIGHT ) {
//Right arrow key code
}
}
但我希望这是在循环内或等待键匹配的东西。
请帮忙。
更新:
我希望程序一直等待,直到按下该键为止,并且当我按下该键时,我想触发另一个动作。例如:
public void something(){
//do something
wait until a key is pressed
if( key pressed is a arrow key){
something();
}else{
wait for the key to be pressed
}
}
public void dootherthing(){
//do other thing
}
我正在积极工作,我不希望GUI不负责任。即当我通过单击按钮调用做其他事情时。它应该这样做,等待应该结束了。
Swing(和大多数GUI)是事件驱动的环境。也就是说,某些事情发生了,您对此做出了反应。
让循环等待某种动作是一种反直观(IMHO)的行为。
一般来说,KeyListener
如果可以的话,应避免使用s。他们有重点关注的问题。该键绑定API有办法在来此限制。
它允许您KeyStroke
针对进行注册,Action
并允许您的程序坐下来等到发生什么事情...
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.LineBorder;
public class KeyBindings {
public static void main(String[] args) {
new KeyBindings();
}
public KeyBindings() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 1;
gbc.gridy = 0;
add(new KeyPane(KeyEvent.VK_UP, 0), gbc);
gbc.gridy = 2;
add(new KeyPane(KeyEvent.VK_DOWN, 0), gbc);
gbc.gridx = 0;
gbc.gridy = 1;
add(new KeyPane(KeyEvent.VK_LEFT, 0), gbc);
gbc.gridx = 2;
add(new KeyPane(KeyEvent.VK_RIGHT, 0), gbc);
}
}
public class KeyPane extends JPanel {
public KeyPane(int keyCode, int modifier) {
setBorder(new LineBorder(Color.DARK_GRAY));
InputMap im = getInputMap(WHEN_IN_FOCUSED_WINDOW);
ActionMap am = getActionMap();
im.put(KeyStroke.getKeyStroke(keyCode, modifier, false), "keyPressed");
im.put(KeyStroke.getKeyStroke(keyCode, modifier, true), "keyReleased");
am.put("keyPressed", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
setBackground(Color.RED);
}
});
am.put("keyReleased", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent e) {
setBackground(UIManager.getColor("Panel.background"));
}
});
}
@Override
public Dimension getPreferredSize() {
return new Dimension(20, 20);
}
}
}
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