如何将空格键的actionListener实现为动作事件 [英] How to implement an actionListener for space bar as action event
问题描述
我已将此设置设置为在计时器上不断进行更新,但是我希望能够使用空格键暂停计时器.我已经尝试实现一个actionListener,但是我不确定该将其应用于什么.我可以找到的大多数示例都与按钮或文本框有关,而不与jpanel中的键盘按下有关.我已经将src打印到控制台,并且似乎没有将空格键注册为事件...我尝试添加actionListener,但是我对语法没有任何了解.任何帮助将不胜感激.
I have this set up to update pretty constantly on the timer, but I want to be able to pause the timer with the spacebar. I have attempted to implement an actionListener, but I am not sure what to apply it to. Most of the examples I can find relate to buttons or text boxes, not keyboard presses inside a jpanel. I have printed src to the console and it doesn't appear to be registering my spacebar as an event... I have tried adding the actionListener, but I am not getting something about the syntax. Any help would be appreciated.
public class Arena extends JFrame {
private PaintPanel paintPanel;
public Arena() {
setDefaultCloseOperation(EXIT_ON_CLOSE);
setMinimumSize(new Dimension(1000, 720));
paintPanel = new PaintPanel();
getContentPane().add(paintPanel, BorderLayout.CENTER);
paintPanel.setBackground(Color.black);
paintPanel.setFocusable(true);
//paintPanel.addActionListener(this);
pack();
paintPanel.initGame();
}
class PaintPanel extends JPanel implements ActionListener {
private List<Gladiator> gladiators;
private Timer timer;
private Ai AI;
private Load loadObject;
public void initGame() {
timer = new Timer(500, this);
timer.start();
AI = new Ai(gladiators);
loadObject = new Load();
}
@Override
public void actionPerformed(ActionEvent e) {
Object src = e.getSource();
System.out.println("************* "+src);
// if (src == spacebar) {
// } else if (src = timer) {
AI.runAI();
try {
Thread.sleep(100);
System.out.println("sleeping");
} catch (InterruptedException d) {
System.err.println("Caught : InterruptedException" + d.getMessage());
}
repaint();
// }
}
public PaintPanel(){
super();
gladiators = new ArrayList<Gladiator>();
String[][] gladiatorInfo = new String[100][25];
String[] gladiatorRaw = new String[100];
String[][] parsedInfo = new String[250][100];
Gladiator[] gladiator = new Gladiator[20];
int[] matchInfo = new int[3];
int numberofcontestants = 0;
gladiatorRaw = loadObject.getGladiators(gladiatorRaw);
parsedInfo = loadObject.parseStats(gladiatorRaw);
Venue venue = new Venue();
matchInfo = loadObject.getMatchSettings(matchInfo);
venue.populateVenue(matchInfo);
gladiator = createGladiators(venue);
for (int a = 0; a < venue.contestants; a++) {
System.out.println("Populating Gladiator "+a);
gladiator[a].populategladiators(parsedInfo,a);
gladiator[a].getEquipment();
gladiator[a].contestantNumber = a;
gladiators.add(gladiator[a]);
}
}
public Gladiator[] createGladiators(Venue venue) {
int[][] initialPlacement = new int[20][2];
Gladiator[] gladiator = new Gladiator[(venue.contestants)];
initialPlacement = loadObject.loadInitialPlacement(venue.contestants);
for (int a = 0; a < venue.contestants; a++) {
System.out.println("Add gladiator "+a);
gladiator[a] = new Gladiator(initialPlacement[a][0],initialPlacement[a][1]);
System.out.println(initialPlacement[a][0]+","+initialPlacement[a][1]);
}
return gladiator;
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
try {
BufferedImage background = ImageIO.read(new File("background.png"));
g.drawImage(background,0,0,this);
} catch (IOException e) {
System.err.println("Caught IOException: " + e.getMessage());
}
for (Gladiator s : gladiators){
s.draw(g2);
}
}
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
Arena gamePanel = new Arena();
gamePanel.setVisible(true);
}
});
}
}
此外,空格键是否有getEvent()键代码?似乎找不到一个.谢谢
Also, is there a getEvent() key code for the spacebar? Can't seem to find one. Thanks
推荐答案
您应使用键绑定 API
InputMap im = getInputMap(WHEN_IN_FOCUSED_WINDOW);
ActionMap am = getActionMap();
im.put(KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0), "space");
am.put("space", new AbstractAction() {
public void actionPerformed(ActionEvent evt) {
if (timer.isRunning()) {
timer.stop();
} else {
timer.start();
}
}
});
InputMap
/ActionMap
可以应用于从JComponent
扩展的任何组件,但是对于您而言,我建议将其附加到您的PaintPane
The InputMap
/ActionMap
can be applied to any component that extends from JComponent
, but in your case, I'd suggest attaching it to your PaintPane
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