从4k显示器拖至FullHD显示器时，应用程序变黑 [英] Application turns black when dragged from a 4k monitor to a FullHD monitor

问题描述

我的笔记本电脑具有4k显示屏.我的外接显示器是1920.当我将Java Swing应用程序窗口从4k显示器拖到外接显示器上时，除了窗口框架外，它会变成全黑.是否在外部显示器上最大化它都没关系.

My notebook has a 4k display. My external monitor is 1920. When I drag my Java Swing app window from the 4k display onto the external monitor it gets completely black except for the window frame. It doesn't matter whether I maximize it on the external monitor or not.

这是我从Oracle.com获得的HelloWorldSwing示例.它显示出完全相同的行为.

Here is the HelloWorldSwing example I got from Oracle.com. It shows the exact same behaviour.

import javax.swing.*;        

public class HelloWorldSwing {
    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("HelloWorldSwing");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Add the ubiquitous "Hello World" label.
        JLabel label = new JLabel("Hello World");
        frame.getContentPane().add(label);

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

它看起来像是Swing中的错误.无论如何，我必须找到解决方案/解决方法.有什么想法吗?

It looks like a bug in Swing. Anyway, I have to find a solution/work-around. Any ideas?

我正在运行jdk/jre 1.8.0 121.

I'm running jdk/jre 1.8.0 121.

推荐答案

我找到了解决方案.基本上，我在主框架中添加了组件侦听器，并在移动事件上侦听.每当移动框架时，我都会检查框架位于哪个显示器上.将框架移到另一个显示器后，我将其设置为不可见，然后在新"显示器上设置新的边界，将扩展状态设置为最大化，最后使该框架再次可见.

I found a solution. Basically I added a component listener to my main frame and listen on move events. Whenever the frame is moved I check on which display it is located. As soon as the frame has been moved to another display I set it invisible, then set new bounds located on the "new" display, set the extended state to maximized and finally make the frame visible again.

在最后几分钟，我疯狂地将窗户从一个显示器拖到另一个显示器上，同时还为之开心.如果您还希望生活中有那么多乐趣，请使用以下代码:

For the last minutes I wildly dragged windows from one display to another all while jumping for joy. If you also want that much fun in your life, here is the code:

mainFrame.addComponentListener(new ComponentListener()
    {
        @Override
        public void componentMoved(ComponentEvent evt)
        {
            GraphicsConfiguration conf = mainFrame.getGraphicsConfiguration();
            GraphicsDevice curDisplay = conf.getDevice();
            GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();

            GraphicsDevice[] allDisplays = env.getScreenDevices();
            for (int i = 0; i < allDisplays.length; i++)
            {
                if (allDisplays[i].equals(curDisplay))
                {
                    //the window has been dragged to another display
                    if (i != _currentDisplayIndex)
                    {
                        final Rectangle sb = conf.getBounds();

                        mainFrame.setVisible(false);
                        //it is important to set the bounds somewhere on the new display before setting the extended state to maximized
                        mainFrame.setBounds(sb.x, sb.y, 1000, 800);
                        mainFrame.setExtendedState(Frame.MAXIMIZED_BOTH);
                        mainFrame.setVisible(true);

                        _currentDisplayIndex = i;
                    }
                }
            }

        }

        @Override
        public void componentShown(ComponentEvent evt)
        {
        }

        @Override
        public void componentResized(ComponentEvent evt)
        {
        }

        @Override
        public void componentHidden(ComponentEvent evt)
        {
        }
    });

Yippie！

旁注:我曾尝试对黑色窗口进行截图.但是，屏幕截图不是黑色的，而是通常显示所有摆动组件.这使我相信，这不仅是摇摆问题，还是某种Windows/显示驱动程序问题.按下"printscreen"不会触发Java中的任何操作(我想)，而只会刷新显示.

Side note: I tried to take a screenshot of the black window earlier. However, the screenshot isn't black, but just normally shows all swing components. That makes me believe, that it is not only a swing issue, but also some sort of a windows/display driver issue. Pressing "printscreen" doesn't trigger anything in java (I guess), but only refreshes the display.

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