问题在于我制作了一个JFrame,文字显示几乎像一部视觉小说。当JLabel中的文本完成时,闪烁的箭头符号">"显示在底部。我做到了这一点,但我如何制作'而#39;如果我按下回车键,循环中断。网上的所有答案都是关于JTextField和Console ......
public static void nextSymbol(boolean blink) {
ImageIcon nextIcon = null;
boolean blinked = false;
if(blink) {
nextIcon = new ImageIcon("res/image/next.gif");
while(blink){
if (/* When ENTER is pressed */){
System.out.println("Disabled");
blink = false;
}
pause(0.01);
}
blinked = true;
}
if(!blink && blinked)
vnGame.nextSymbolIcon.setIcon(null);
else
;
blinked = false;
}
修改
所以经过一些混合我改变了程序......没有一个答案有效(或者我做了一些错误的idk ......)
新代码现在是:
public static void nextSymbol() {
ImageIcon nextIcon = null;
nextIcon = new ImageIcon("res/image/next.gif");
vnGame.nextSymbolIcon.setIcon(nextIcon);
boolean next = false;
Continue = 0;
do {
vnGame.contentPane.requestFocus();
switch(Continue) {
case 1:{
next = true;
break;
}
default:break;
}
}while(!next);
SysPrint("Continue!");nl();
}
继续更改方法在这里(另一个类):
public void keyPressed(KeyEvent e) {
if (e.getKeyChar() == 's') {
VONGINE.SysPrint("S");
VONGINE.Continue = 1;
}
}
最后是新问题......我怎么称呼......
keyPressed(KeyEvent e)
...在do循环期间?
答案 0 :(得分:4)
首先,您不需要使用while (true)
循环。这是一个Swing GUI,你冒险在Swing事件线程上循环,冻结你的GUI。相反,你需要以不同的方式思考,以事件驱动的方式思考,因为大多数GUI都是如此,包括Swing的工作方式。
做点什么"眨眼"在JLabel中,使用Swing Timer代替while循环,并在Timer的ActionListener中显示并显示">" JLabel中的角色。
要在按下Enter键时停止此操作,请使用键绑定(不是KeyListener)。或者,如果JTextField具有焦点,则添加到JTextField的ActionListener将起作用。
例如,考虑尝试这些方面:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.*;
@SuppressWarnings("serial")
public class SwappingLabel extends JPanel {
public static final String IMG_PATH = "http://www.guitarchordsmagic.com/images/arrow.gif";
private static final int PREF_W = 400;
private static final int PREF_H = PREF_W;
private JLabel nextSymbolIcon = new JLabel("", SwingConstants.CENTER);
private Icon nextIcon;
public SwappingLabel() throws MalformedURLException {
// Create our ImageIcon from online (or local) source
nextIcon = getOnlineIcon(IMG_PATH);
// add icon to JLabel
nextSymbolIcon.setIcon(nextIcon);
// set up key binding to recognize enter key press
setupKeyBinding();
// add the JLabel to the bottom of the GUI
setBackground(Color.white);
JPanel southPanel = new JPanel();
southPanel.setOpaque(false);
southPanel.add(nextSymbolIcon);
setLayout(new BorderLayout());
add(southPanel, BorderLayout.PAGE_END);
}
private Icon getOnlineIcon(String path) throws MalformedURLException {
URL imgUrl = new URL(path);
return new ImageIcon(imgUrl);
}
private void setupKeyBinding() {
int condition = WHEN_IN_FOCUSED_WINDOW;
InputMap inputMap = getInputMap(condition);
ActionMap actionMap = getActionMap();
KeyStroke enterKey = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0);
// the action that will be called when enter is pressed
Action action = new EnterAction();
// bind the key press to the component to the action
inputMap.put(enterKey, enterKey.toString());
actionMap.put(enterKey.toString(), action);
}
@Override
public Dimension getPreferredSize() {
if (isPreferredSizeSet()) {
return super.getPreferredSize();
}
return new Dimension(PREF_W, PREF_H);
}
private class EnterAction extends AbstractAction {
@Override
public void actionPerformed(ActionEvent e) {
nextSymbolIcon.setIcon(null);
}
}
private static void createAndShowGui() {
JFrame frame = new JFrame("Blinking Label");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
try {
frame.getContentPane().add(new SwappingLabel());
} catch (MalformedURLException e) {
e.printStackTrace();
System.exit(-1);
}
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
请注意,此处没有while或do-while循环,没有不必要的静态方法或字段,并且所有调用都在Swing事件线程上完成。