爪哇 - 屏幕变黑，设置一个JFrame到全屏时 [英] Java - Screen turns black, when setting a JFrame to Fullscreen

问题描述

我想画在Canvas的东西，把它添加到一个JFrame，然后设置此JFrame的到全屏。我的问题是：在fullscreenmode我只看到一个黑色的屏幕。
屏幕变黑之前，我很快可以看到画布上的粉红色背景。

I'm trying to draw something on a Canvas, add it to a JFrame and then set this JFrame to Fullscreen. My problem is: in fullscreenmode I only see a black screen. Before the screen turns black I shortly can see the pink background of the canvas.

直接在JFrame上绘图，然后将其设置为全屏运行完美，我可以看到testtext。我想有一个与正常显示的画布的一个问题。

Drawing directly on a JFrame and then setting it to fullscreen works perfectly fine and I can see the testtext. I assume there is a problem with displaying the Canvas properly.

下面是我的code：

public class FullscreenTest extends Canvas {

    private JFrame mainFrame;

    public FullscreenTest(){
        this.mainFrame = new JFrame();
        JPanel contentPane = (JPanel) mainFrame.getContentPane();
        contentPane.add(this);
    }

    public void run(DisplayMode dm){
        setBackground(Color.PINK);
        setForeground(Color.WHITE);
        setFont(new Font("Arial", Font.PLAIN, 24));

        Screen s = new Screen();

        s.setFullScreen(dm, this.mainFrame);

        try {
            Thread.sleep(5000);
        } catch (InterruptedException exc) { exc.printStackTrace(); }

        s.closeFullScreenWindow();
    }

    public void paint(Graphics g){      
        g.drawString("This is some testtext", 200, 200);
    }

    public static void main(String[] args){
        DisplayMode dm = new DisplayMode(800, 600, 32, DisplayMode.REFRESH_RATE_UNKNOWN);
        FullscreenTest test = new FullscreenTest();
        test.run(dm);
    }
}

下面是个什么Screen.setFullScreen（DISPLAYMODE DM，JFrame的窗口）方法：

Here is what the Screen.setFullScreen(DisplayMode dm, JFrame window) method does:

//graphicsDevice = GraphicsEnvironment.getLocalGraphicsEnvironment()
//                 .getDefaultScreenDevice();
public void setFullScreen(DisplayMode dm, JFrame window){
    window.setUndecorated(true);
    window.setResizable(false);
    graphicsDevice.setFullScreenWindow(window);

    if(dm != null && graphicsDevice.isDisplayChangeSupported()){
        graphicsDevice.setDisplayMode(dm);          
    }
}

有没有人有一个线索，为什么我没有看到在JFrame的全屏内容？

Does anyone have a clue why I don't see the JFrame's content in fullscreen?

推荐答案

1）你有三个一般性的问题。

1) you have three general issues

• 从未块EDT使用视频下载（5000）; 使用的摇摆定时器的替代，示范这里

（如果不存在真正的重要原因）不混合的 AWT与Swing 剩下的就是这里 ，并使用的JP​​anel 而不是画布（为画布是有油漆方法，的JP​​anel 有的paintComponent ）

(if aren't there really important reasons) don't mixing AWT with Swing the rest is here, and use JPanel instead of Canvas (for Canvas is there paint method, for JPanel is there paintComponent)

您公共无效漆（图形G）{是的JFrame 而不是画布和视频下载（5000）;

2）Swing GUI的rellated应该被包装成的invokeLater（）意

2) Swing GUI rellated should be wrapped into invokeLater() meaning

public static void main(String[] args){

更在初始线程

3）链接code例如 你可以找到demostrations如何使用后台线程在Swing

3) in linked code example you can find out demostrations how to use background thread in the Swing

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