Java SplashScreen 始终在顶部 Mac

Question

我使用的是 macOS 10.14.2 和 JDK 1.8.0_192.

对于我的应用程序，我有一个使用 Java 的 java.awt.SplashScreen 的初始屏幕。

当我运行我的应用程序在 Windows 上时，如果单击 window，启动画面将隐藏在重叠的 window 下。

但是，在 macOS 上，启动画面会隐藏一瞬间，然后再次强行显示在顶部。

所需的 VM 参数是“-splash:pathToImage”，其中 pathToImage 是系统中下图的路径：https://i.imgur.com/snPOG2S.gif（需要下载）

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package splash;

import java.awt.AlphaComposite;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Frame;
import java.awt.Graphics2D;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.RenderingHints;
import java.awt.SplashScreen;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;

public class SplashDemo extends Frame implements ActionListener {
    private static final long serialVersionUID = 1L;

    private static void renderSplashFrame(Graphics2D g, int frame) {
        final String[] comps = {"foo", "bar", "baz"};
        g.setComposite(AlphaComposite.Clear);
        g.fillRect(120, 140, 200, 40);
        g.setPaintMode();
        g.setColor(Color.BLACK);
        g.drawString("Loading " + comps[(frame / 5) % 3] + "...", 120, 150);
    }

    private SplashDemo() {
        super("SplashScreen demo");
        setSize(300, 200);
        setLayout(new BorderLayout());
        Menu m1 = new Menu("File");
        MenuItem mi1 = new MenuItem("Exit");
        m1.add(mi1);
        mi1.addActionListener(this);
        this.addWindowListener(closeWindow);

        MenuBar mb = new MenuBar();
        setMenuBar(mb);
        mb.add(m1);
        final SplashScreen splash = SplashScreen.getSplashScreen();
        if(splash == null) {
            System.out.println("SplashScreen.getSplashScreen() returned null");
            return;
        }
        Graphics2D g = splash.createGraphics();
        if(g == null) {
            System.out.println("g is null");
            return;
        }
        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        for(int i = 0; i < 100; i++) {
            renderSplashFrame(g, i);
            splash.update();
            try {
                Thread.sleep(90);
            }
            catch(InterruptedException ignored) {}
        }
        splash.close();
        setVisible(true);
        toFront();
    }

    @Override
    public void actionPerformed(ActionEvent ae) {
        System.exit(0);
    }

    private static WindowListener closeWindow = new WindowAdapter() {
        @Override
        public void windowClosing(WindowEvent e) {
            e.getWindow().dispose();
        }
    };

    public static void main(String[] args) {
        new SplashDemo();
    }
}

如果它更容易，这里有一个 link 到一个带有上面代码的编译 jar：https://github.com/Jorl17/jar2app/files/1456251/SplashDemo.jar.zip.

它内部已经有图像并且是用清单中的以下行编译的 "SplashScreen-Image: splash.gif"，所以不需要 VM 参数。

Answer 1

创建此问题后已确认这是 Java 中的错误：https://bugs.openjdk.java.net/browse/JDK-8216158

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