java - リスナー内からのJFrameの変更

Question

重複の可能性：
フレームが表示された後にsetUndecorated（）を呼び出す方法は？

焦点が合っていないときにJFrameを装飾せず、焦点を合わせたときに装飾するにはどうすればよいですか？

これが私のコードです：

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);
    }
}

そして、実行時およびフォーカス/非フォーカス時の問題は次のとおりです。

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)

初心者を許してください、私がここで見逃しているいくつかの基本的な概念があると確信しています、そして私はそれを最も知りたいです。

score 8 · Accepted Answer

以下のアイデアを与えたリンクに対する@AaronKurtzhalsと@trashgodsのコメントに+1

これが私があなたを助けるために作った短い例です。

解決：

1）インスタンスを呼び出しdispose()てリソースを解放しますJFrame

2）必要に応じてフレームインスタンスを編集します。setUndecorated(..)

3）に電話pack()しsetVisible(true)てJFrameください。

フォーカス/マウスオーバー時（呼び出されたときsetUndecorated(true)はフォーカスイベントをリッスンできません）：

ここに画像の説明を入力してください

集中していないとき：

ここに画像の説明を入力してください

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);
    }
}

あなたが気づいたかもしれないいくつかのヒント：

JFrame不必要に伸ばさないでください
Event Dispatch ThreadSwingコンポーネントを作成および操作するために使用します

java - リスナー内からのJFrameの変更

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