可能的重复：
如何在框架可见后调用 setUndecorated() ？ https://stackoverflow.com/questions/875132/how-to-call-setundecorated-after-a-frame-is-made-visible
我应该如何使 JFrame 在未聚焦时不装饰，在聚焦时装饰？
这是我的代码：
import java.awt.event.*;
import javax.swing.*;
public class Test extends JFrame
{
public Test()
{
setSize(100, 50);
addWindowFocusListener(new WindowAdapter()
{
public void windowGainedFocus(WindowEvent e)
{
setUndecorated(false);
System.out.println("Hi!");
}
public void windowLostFocus(WindowEvent e)
{
setUndecorated(true);
System.out.println("Bye!");
}
});
}
public static void main(String[] args)
{
new Test().setVisible(true);
}
}
这是运行时以及聚焦/不聚焦时的问题：
Exception in thread "AWT-EventQueue-0" java.awt.IllegalComponentStateException: The frame is displayable.
at java.awt.Frame.setUndecorated(Frame.java:825)
at Test$1.windowGainedFocus(Test.java:13)
at java.awt.Window.processWindowFocusEvent(Window.java:1952)
at java.awt.Window.processEvent(Window.java:1867)
at java.awt.Component.dispatchEventImpl(Component.java:4750)
at java.awt.Container.dispatchEventImpl(Container.java:2103)
at java.awt.Window.dispatchEventImpl(Window.java:2518)
at java.awt.Component.dispatchEvent(Component.java:4576)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1895)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:965)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:412)
at java.awt.Component.dispatchEventImpl(Component.java:4620)
at java.awt.Container.dispatchEventImpl(Container.java:2103)
at java.awt.Window.dispatchEventImpl(Window.java:2518)
at java.awt.Component.dispatchEvent(Component.java:4576)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:672)
at java.awt.EventQueue.access$400(EventQueue.java:96)
at java.awt.EventQueue$2.run(EventQueue.java:631)
at java.awt.EventQueue$2.run(EventQueue.java:629)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116)
at java.awt.EventQueue$3.run(EventQueue.java:645)
at java.awt.EventQueue$3.run(EventQueue.java:643)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:642)
at java.awt.SequencedEvent.dispatch(SequencedEvent.java:113)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:670)
at java.awt.EventQueue.access$400(EventQueue.java:96)
at java.awt.EventQueue$2.run(EventQueue.java:631)
at java.awt.EventQueue$2.run(EventQueue.java:629)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116)
at java.awt.EventQueue$3.run(EventQueue.java:645)
at java.awt.EventQueue$3.run(EventQueue.java:643)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:642)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)
Exception in thread "AWT-EventQueue-0" java.awt.IllegalComponentStateException: The frame is displayable.
at java.awt.Frame.setUndecorated(Frame.java:825)
at Test$1.windowLostFocus(Test.java:18)
at java.awt.Window.processWindowFocusEvent(Window.java:1955)
at java.awt.Window.processEvent(Window.java:1867)
at java.awt.Component.dispatchEventImpl(Component.java:4750)
at java.awt.Container.dispatchEventImpl(Container.java:2103)
at java.awt.Window.dispatchEventImpl(Window.java:2518)
at java.awt.Component.dispatchEvent(Component.java:4576)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1895)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:965)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:712)
at java.awt.Component.dispatchEventImpl(Component.java:4620)
at java.awt.Container.dispatchEventImpl(Container.java:2103)
at java.awt.Window.dispatchEventImpl(Window.java:2518)
at java.awt.Component.dispatchEvent(Component.java:4576)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:672)
at java.awt.EventQueue.access$400(EventQueue.java:96)
at java.awt.EventQueue$2.run(EventQueue.java:631)
at java.awt.EventQueue$2.run(EventQueue.java:629)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116)
at java.awt.EventQueue$3.run(EventQueue.java:645)
at java.awt.EventQueue$3.run(EventQueue.java:643)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:642)
at java.awt.SequencedEvent.dispatch(SequencedEvent.java:113)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:670)
at java.awt.EventQueue.access$400(EventQueue.java:96)
at java.awt.EventQueue$2.run(EventQueue.java:631)
at java.awt.EventQueue$2.run(EventQueue.java:629)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:116)
at java.awt.EventQueue$3.run(EventQueue.java:645)
at java.awt.EventQueue$3.run(EventQueue.java:643)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:642)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)
请原谅新手，我确信我在这里缺少一些基本概念，而我最想知道这一点。
+1 给 @AaronKurtzhals 和 @trashgods 对提供以下想法的链接的评论
这是我为帮助您而制作的一个简短示例。
解决方案：
1) call dispose() on JFrame实例释放资源
2）根据需要编辑框架实例，即setUndecorated(..)
3) Call pack() and setVisible(true) on JFrame.
当聚焦/鼠标悬停时（当setUndecorated(true)被称为我们无法监听焦点事件）：
注意力不集中时：
import java.awt.Dimension;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
public class Test {
private boolean firstTime2 = true;
private boolean firstTime = true;
private JFrame frame;
private JLabel focusLabel=new JLabel("");
public Test() {
initComponents();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Test();
}
});
}
private void initComponents() {
initFrame();
frame.addMouseMotionListener(new MouseMotionAdapter() {
@Override
public void mouseMoved(MouseEvent me) {
super.mouseMoved(me);
firstTime2 = false;
firstTime = false;
if (frame.isUndecorated()) {
focusLabel.setText("Focused");
firstTime = true;
firstTime2 = true;
frame.dispose();
frame.setUndecorated(false);
showFrame();
}
}
});
frame.addWindowFocusListener(new WindowAdapter() {
@Override
public void windowGainedFocus(WindowEvent e) {
if (firstTime) {
focusLabel.setText("Focused");
firstTime = false;
frame.dispose();
frame.setUndecorated(false);
showFrame();
}
}
@Override
public void windowLostFocus(WindowEvent e) {
if (!firstTime2) {
focusLabel.setText("Not focused");
frame.dispose();
frame.setUndecorated(true);
showFrame();
}
firstTime2 = false;
}
});
showFrame();
}
private void initFrame() {
frame = new JFrame() {
@Override
public Dimension getPreferredSize() {
return new Dimension(300, 300);
}
};
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(focusLabel);
}
private void showFrame() {
frame.pack();
frame.setVisible(true);
}
}
您可能已经注意到的一些提示：
- 不要延长
JFrame不必要地
- Use Event Dispatch Thread http://docs.oracle.com/javase/tutorial/uiswing/concurrency/dispatch.html创建和操作 Swing 组件
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