那些遇到过的问题

从侦听器中修改JFrame

wer*_*len 5 java swing focus awt jframe

可能重复:
如何在框架可见后调用setUndecorated()？

如果没有焦点并且在聚焦时装饰,我应该如何使JFrame不修饰？

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);
    }
}
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这是运行时和聚焦/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)
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原谅一个新手,我敢肯定这里有一些基本的概念,我最想知道的.

Dav*_*amp 8

+1给@AaronKurtzhals和@trashgods评论提供以下想法的链接

这是我为帮助你而做的一个简短例子.

解:

1)调用dispose()的JFrame情况下释放资源

2)根据需要编辑框架实例,即 setUndecorated(..)

3)呼叫pack()和setVisible(true)上JFrame.

当聚焦/鼠标悬停时(因为setUndecorated(true)被称为我们无法监听焦点事件):

在此输入图像描述

什么时候不专注:

在此输入图像描述

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);
    }
}
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