基本上，我有一个keylistener代码（我知道键绑定谢谢你，但我不需要为我的项目），它会根据你按下的内容重新调整窗口框架的大小。但是，当你按住w时，它就像这样[暂停] wwwwwwww，每当你重新调整窗口大小时它都会引人注目。有人可以帮我成功地在我的代码中加入计时器吗？我已经排除了导入语句，但它们都在那里。
public class KeyFrame extends JFrame implements KeyListener
{
public boolean t = true;
private final HashSet<Integer> pressed = new HashSet<Integer>();
private Timer timer;
public KeyFrame(String name) {
super(name);
}
public void keyTyped(KeyEvent e) {
return;
}
public void keyPressed(KeyEvent e) {
pressed.add(e.getKeyCode());
new Timer(10, new ActionListener(){public void actionPerformed(ActionEvent arg0){}}).start();
if (pressed.size() >= 1) {
for(int code : pressed) {
if(code == KeyEvent.VK_D){
this.setSize(getWidth()+5, getHeight());}
if(code == KeyEvent.VK_A)
this.setSize(getWidth()-5, getHeight());
if(code == KeyEvent.VK_S)
this.setSize(getWidth(), getHeight()+5);
if(code == KeyEvent.VK_W)
this.setSize(getWidth(), getHeight()-5);
}
}
}
public void keyReleased(KeyEvent e) {
pressed.remove(e.getKeyCode());
}
}
答案 0 :(得分：1)
然而，当你按住w时，它就像这样[暂停] wwwwwwww
这是大多数操作系统的标准操作
不要在Timer中启动KeyPressed，让Timer独立于KeyListener
您可能还希望将代码检查放入ActionListener而不是keyPressed方法
public class KeyFrame extends JFrame implements KeyListener
{
public boolean t = true;
private final HashSet<Integer> pressed = new HashSet<Integer>();
private Timer timer;
public KeyFrame(String name) {
super(name);
new Timer(10, new ActionListener(){
public void actionPerformed(ActionEvent arg0){
if(pressed.contains(KeyEvent.VK_D)) {
setSize(getWidth()+5, getHeight());
} else if(pressed.contains(KeyEvent.VK_A)) {
setSize(getWidth()-5, getHeight());
} else if(pressed.contains(KeyEvent.VK_S)) {
setSize(getWidth(), getHeight()+5);
} else if(pressed.contains(KeyEvent.VK_W)) {
setSize(getWidth(), getHeight()-5);
}
}
}).start();
}
public void keyTyped(KeyEvent e) {
return;
}
public void keyPressed(KeyEvent e) {
pressed.add(e.getKeyCode());
}
public void keyReleased(KeyEvent e) {
pressed.remove(e.getKeyCode());
}
}
您还会发现密钥绑定将解决与KeyListener相关的焦点相关问题，这就是我们通常推荐的原因
我知道keybindings谢谢你，但我不需要那个项目
然后你应该使用它们，真的没有任何借口不
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private Delta xDelta;
private Delta yDelta;
public TestPane() {
xDelta = new Delta();
yDelta = new Delta();
bindKeyStrokeTo(WHEN_IN_FOCUSED_WINDOW, "delta.up.pressed", KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0), new DeltaAction(yDelta, -5));
bindKeyStrokeTo(WHEN_IN_FOCUSED_WINDOW, "delta.up.released", KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0, true), new DeltaAction(yDelta));
bindKeyStrokeTo(WHEN_IN_FOCUSED_WINDOW, "delta.down.pressed", KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0), new DeltaAction(yDelta, 5));
bindKeyStrokeTo(WHEN_IN_FOCUSED_WINDOW, "delta.down.released", KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0, true), new DeltaAction(yDelta));
bindKeyStrokeTo(WHEN_IN_FOCUSED_WINDOW, "delta.left.pressed", KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0), new DeltaAction(xDelta, -5));
bindKeyStrokeTo(WHEN_IN_FOCUSED_WINDOW, "delta.left.released", KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0, true), new DeltaAction(xDelta));
bindKeyStrokeTo(WHEN_IN_FOCUSED_WINDOW, "delta.right.pressed", KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, 0), new DeltaAction(xDelta, 5));
bindKeyStrokeTo(WHEN_IN_FOCUSED_WINDOW, "delta.right.released", KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, 0, true), new DeltaAction(xDelta));
Timer timer = new Timer(250, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Window window = SwingUtilities.getWindowAncestor(TestPane.this);
Dimension size = window.getSize();
size.width += xDelta.getValue();
size.height += yDelta.getValue();
window.setSize(size);
}
});
timer.start();
}
public void bindKeyStrokeTo(int condition, String name, KeyStroke keyStroke, Action action) {
InputMap im = getInputMap(condition);
ActionMap am = getActionMap();
im.put(keyStroke, name);
am.put(name, action);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
}
public class Delta {
private int value;
public int getValue() {
return value;
}
public void setValue(int value) {
this.value = value;
}
}
public class DeltaAction extends AbstractAction {
private Delta delta;
private int value;
public DeltaAction(Delta delta, int value) {
this.delta = delta;
this.value = value;
}
public DeltaAction(Delta delta) {
this(delta, 0);
}
@Override
public void actionPerformed(ActionEvent e) {
delta.setValue(value);
}
}
}