Question

如果您使用支持jdk7的NetBeans IDE 7.0构建并运行TranslucentWindow，则会出现以下异常：

Exception in thread "AWT-EventQueue-0" java.awt.IllegalComponentStateException: The frame is decorated
    at java.awt.Frame.setOpacity(Frame.java:960)
    at main.TranslucentWindow.<init>(TranslucentWindow.java:23)
    at main.TranslucentWindow$1.run(TranslucentWindow.java:47)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
    at java.awt.EventQueue.access$000(EventQueue.java:101)
    at java.awt.EventQueue$3.run(EventQueue.java:666)
    at java.awt.EventQueue$3.run(EventQueue.java:664)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:675)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
BUILD SUCCESSFUL (total time: 1 second)

根据此堆栈跟踪，违规行为tw.setOpacity(0.55f)。但是，正如错误所示，如果你在框架上调用setUndecorated(true)，那么它不会抛出异常并创建一个半透明窗口，虽然没有任何装饰（这很痛苦）。这是正常的吗？这段代码不应该“开箱即用”吗？我忽略了什么吗？

修改

为什么他们的半透明窗口看起来是装饰的，还是这种自定义渲染？

它是什么......

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应该是什么......

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Answer 1

从JavaDocs for java.awt.frame.setOpacity() in JDK7开始：

必须满足以下条件才能将不透明度值设置为小于1.0f：


底层系统必须支持TRANSLUCENT半透明

窗口必须未修饰（参见setUndecorated（boolean）和Dialog.setUndecorated（boolean））

窗口不得处于全屏模式（请参阅GraphicsDevice.setFullScreenWindow（Window））


如果请求的不透明度值小于1.0f，并且不满足上述任何条件，则窗口不透明度将不会更改，并且将抛出IllegalComponentStateException。

您所看到的行为已被记录，并且是预期的行为。

Answer 2

这是经过验证的错误。我使用默认安装的JDK 1.7.0或JRE7发送了有关其示例代码失败的Oracle信息。使用下面编译成TranslucentWindow.java的源代码，它会失败并产生上面最初指出的异常。

来自网页Oracle's Translucency / Shaped Windows Page

// Taken from http://download.oracle.com/javase/tutorial/uiswing/misc/trans_shaped_windows.html#uniform 
import java.awt.*;
import javax.swing.*;
import static java.awt.GraphicsDevice.WindowTranslucency.*;

public class TranslucentWindow extends JFrame {
public TranslucentWindow() {
    super("TranslucentWindow");
    setLayout(new GridBagLayout());

    setSize(300,200);
    setLocationRelativeTo(null);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    //Add a sample button.
    add(new JButton("I am a Button"));
}

public static void main(String[] args)  {
        // Determine if the GraphicsDevice supports translucency.
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice gd = ge.getDefaultScreenDevice();

        //If translucent windows aren't supported, exit.
        if (!gd.isWindowTranslucencySupported(TRANSLUCENT))
    {
        System.err.println("Translucency is not supported");
        System.exit(0);
    }

    // Create the GUI on the event-dispatching thread
    SwingUtilities.invokeLater(new Runnable()
    {
        @Override
        public void run()
        {
            TranslucentWindow tw = new TranslucentWindow();
            // Set the window to 55% opaque (45% translucent).
            tw.setOpacity(0.55f);
            // Display the window.
            tw.setVisible(true);
        }
    });
}

}

Exception in thread "AWT-EventQueue-0" java.awt.IllegalComponentStateException: The frame is decorated
    at java.awt.Frame.setOpacity(Frame.java:960)
    at TranslucentWindow$1.run(TranslucentWindow.java:38)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
    at java.awt.EventQueue.access$000(EventQueue.java:101)
    at java.awt.EventQueue$3.run(EventQueue.java:666)
    at java.awt.EventQueue$3.run(EventQueue.java:664)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:675)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

Answer 3

在JDK 7中使用com.sun.awt.AWTUtilities.setWindowOpacity(w, 0.5f)。

请参阅here。

Answer 4

您好这个代码的问题是它缺少main（）方法中的以下代码行：

JFrame.setDefaultLookAndFeelDecorated(true);

它应该在检查是否不支持半透明窗口的代码之后立即退出：

    //If translucent windows aren't supported, exit.
    if (!gd.isWindowTranslucencySupported(TRANSLUCENT)) {
        System.err.println(
            "Translucency is not supported");
            System.exit(0);
    }

    JFrame.setDefaultLookAndFeelDecorated(true);

    // Create the GUI on the event-dispatching thread
    SwingUtilities.invokeLater(new Runnable() {
        @Override
        public void run() {
            TranslucentWindow tw = new TranslucentWindow();

            // Set the window to 55% opaque (45% translucent).
            tw.setOpacity(0.55f);

            // Display the window.
            tw.setVisible(true);
        }
    });

此外，均匀半透明图像的图像具有误导性，因为它使用了Java外观。相反，图像应该使用Windows系统的外观（假设你在Windows上）。如果您尝试使用Java外观（即JFrame.setDefaultLookAndFeelDecorated(false);），那么它将抛出与以前相同的错误。我希望半透明窗口可以与Java外观一起使用，但我不认为这是可能的。

Answer 5

我认为你需要在setBackground之前setUndecorated这将解决问题

Java Tutorials半透明窗口示例给使用jdk7的人带来了麻烦吗？

5 个答案: