我在Swing应用程序中禁用/启用按钮时遇到一个小问题。 这是一个非常基本的问题,但我是这个概念的新手。
我有一个要求,例如,有2个按钮可以执行2个单独的操作。
但是,我的问题是,在处理完B1 / B2后SetEnable / SetVisible工作正常。它应该在启动前禁用,在完成任务后启用
在这种情况下,任何人都可以提供帮助吗?
以下是我的代码
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.WindowConstants;
public class FinCSV implements ActionListener {
JFrame frame = new JFrame("ICON");
JPanel panel = new JPanel(new GridLayout(2, 1, 4, 4));
JButton primaryButton = new JButton(" Primary Process");
JButton secondaryButton = new JButton(" Secondary Process");
public static void main(String[] args)
throws Exception {
FinCSV msql = new FinCSV();
msql.initGUI();
}
public void initGUI() {
this.primaryButton.setActionCommand("Primary");
this.secondaryButton.setActionCommand("Secondary");
this.primaryButton.addActionListener(this);
this.secondaryButton.addActionListener(this);
this.primaryButton.setFont(new Font("Serif", Font.BOLD, 22));
this.secondaryButton.setFont(new Font("Serif", Font.BOLD, 22));
panel.add(this.primaryButton);
panel.add(this.secondaryButton);
frame.setContentPane(panel);
frame.setSize(650, 300);
frame.setVisible(true);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("Primary")) {
secondaryButton.setVisible(false);
// secondaryButton.setEnabled(false);
for (int i = 0; i < 10000; i++) {
System.out.println("[ " + (i + 1) + " ] Inside Primary Process");
}
secondaryButton.setVisible(true);
// secondaryButton.setEnabled(true);
} else if (e.getActionCommand().equals("Secondary")) {
primaryButton.setVisible(false);
// primaryButton.setEnabled(false);
for (int i = 0; i < 10000; i++) {
System.out.println("[ " + (i + 1) + " ] Inside Secondary Process");
}
primaryButton.setVisible(true);
// primaryButton.setEnabled(true);
}
}
}
答案 0 :(得分:2)
不要做任何可能阻止事件调度线程的事情。这里的问题是您在actionPerformed
方法
//...
for (int i = 0; i < 10000; i++) {
System.out.println("[ " + (i + 1) + " ] Inside Primary Process");
}
//..
这阻止它允许EDT处理新的绘制请求(比如绘制禁用的按钮)
请查看Concurrency in Swing了解详情
考虑使用SwingWorker
实际执行工作并在完成后重新启用状态。
请查看Worker Threads and SwingWorker了解详情
例如......
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingWorker;
import javax.swing.WindowConstants;
public class FinCSV implements ActionListener {
JFrame frame = new JFrame("ICON");
JPanel panel = new JPanel(new GridLayout(2, 1, 4, 4));
JButton primaryButton = new JButton(" Primary Process");
JButton secondaryButton = new JButton(" Secondary Process");
public static void main(String[] args)
throws Exception {
FinCSV msql = new FinCSV();
msql.initGUI();
}
public void initGUI() {
this.primaryButton.setActionCommand("Primary");
this.secondaryButton.setActionCommand("Secondary");
this.primaryButton.addActionListener(this);
this.secondaryButton.addActionListener(this);
this.primaryButton.setFont(new Font("Serif", Font.BOLD, 22));
this.secondaryButton.setFont(new Font("Serif", Font.BOLD, 22));
panel.add(this.primaryButton);
panel.add(this.secondaryButton);
frame.setContentPane(panel);
frame.setSize(650, 300);
frame.setVisible(true);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("Primary")) {
secondaryButton.setVisible(false);
PrimaryWorker worker = new PrimaryWorker(secondaryButton);
worker.execute();
} else if (e.getActionCommand().equals("Secondary")) {
primaryButton.setVisible(false);
SecondaryWorker secondaryWorker = new SecondaryWorker(primaryButton);
secondaryWorker.execute();
}
}
public abstract class StateWorker<T, V> extends SwingWorker<T, V> {
private JButton btn;
public StateWorker(JButton btn) {
this.btn = btn;
}
@Override
protected void done() {
btn.setVisible(true);
}
}
public class PrimaryWorker extends StateWorker<Integer, Integer> {
public PrimaryWorker(JButton btn) {
super(btn);
}
@Override
protected Integer doInBackground() throws Exception {
int sum = 0;
for (int i = 0; i < 10000; i++) {
System.out.println("[ " + (i + 1) + " ] Inside Primary Process");
sum += i;
publish(i);
}
return sum;
}
}
public class SecondaryWorker extends StateWorker<Integer, Integer> {
public SecondaryWorker(JButton btn) {
super(btn);
}
@Override
protected Integer doInBackground() throws Exception {
int sum = 0;
for (int i = 0; i < 10000; i++) {
System.out.println("[ " + (i + 1) + " ] Inside Secondary Process");
sum += i;
publish(i);
}
return sum;
}
}
}
另请参阅安德鲁在主要评论部分中关于使用JRadioButton
答案 1 :(得分:0)
将完整的操作代码保存到Thread中,然后尝试
Thread th1 = new Thread() {
public void run() {
// Keep you code here
}
};
th1.start();
答案 2 :(得分:-1)
这是因为您在代码的主线程内部处理了。
如果你想做一些繁重的事情,但仍然希望代码的其他部分能够顺利运行,那么你应该使用Threads。
但是,对于你的代码,你可以使用InvokeLater让你的主线程在第一个可用时间之后运行你的代码的一部分 - 我认为这是你没有接到这个电话的每个函数调用(他们必须完成控制应该回到主运行程序,我相信它是下一个周期的更新GUI。请自行阅读InvokeLater帮助部分)
如果您想要禁用/隐藏按钮,这就是您的代码的工作方式。
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.WindowConstants;
public class FinCSV implements ActionListener {
JFrame frame = new JFrame("ICON");
JPanel panel = new JPanel(new GridLayout(2, 1, 4, 4));
JButton primaryButton = new JButton(" Primary Process");
JButton secondaryButton = new JButton(" Secondary Process");
public static void main(String[] args)
throws Exception {
FinCSV msql = new FinCSV();
msql.initGUI();
}
public void initGUI() {
this.primaryButton.setActionCommand("Primary");
this.secondaryButton.setActionCommand("Secondary");
this.primaryButton.addActionListener(this);
this.secondaryButton.addActionListener(this);
this.primaryButton.setFont(new Font("Serif", Font.BOLD, 22));
this.secondaryButton.setFont(new Font("Serif", Font.BOLD, 22));
panel.add(this.primaryButton);
panel.add(this.secondaryButton);
frame.setContentPane(panel);
frame.setSize(650, 300);
frame.setVisible(true);
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
}
@Override
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("Primary")) {
secondaryButton.setVisible(false);
primaryButton.setEnabled(false);
run_btn_1();
} else if (e.getActionCommand().equals("Secondary")) {
primaryButton.setVisible(false);
secondaryButton.setEnabled(false);
run_btn_2();
}
}
public void run_btn_1() {
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
for (int i = 0; i < 10000; i++) {
System.out.println("[ " + (i + 1) + " ] Inside Primary Process");
}
secondaryButton.setVisible(true);
primaryButton.setEnabled(true);
}
});
}
public void run_btn_2() {
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
for (int i = 0; i < 10000; i++) {
System.out.println("[ " + (i + 1) + " ] Inside Secondary Process");
}
primaryButton.setVisible(true);
secondaryButton.setEnabled(true);
}
});
}
}
所以,你需要做的就是在这里放点东西:
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
//your code if you want to run it in next gui update
}
});
<强> EDITED 强>
使用线程:
public void run_btn_1() {
new Thread(new Runnable() {
@Override
public void run() {
//loop
secondaryButton.setVisible(true);
primaryButton.setEnabled(true);
}
}).start();
}
public void run_btn_2() {
new Thread(new Runnable() {
@Override
public void run() {
// loop
primaryButton.setVisible(true);
secondaryButton.setEnabled(true);
}
}).start();
}