在根容器中分层多个 GlassPane

Question

是否可以为单个 JFrame 添加多个 GlassPane，或者我必须使用不舒服的 LayeredPane 和 Opacity< /代码> 属性。

我附上了一些代码，显示了我想要做什么（由@camickr提供）。

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.border.*;

public class MultiplayGlassPane {

    private static final long serialVersionUID = 1L;
    private JFrame frame = new JFrame("frameTitle");
    private JPanel fPanel = new JPanel();
    private Random random = new Random();
    private final static Border MESSAGE_BORDER = new EmptyBorder(10, 10, 10, 10);
    private JLabel message = new JLabel();
    private ArrayList<Star> stars = new ArrayList<Star>();

    public MultiplayGlassPane() {

        MyGlassPane glass = new MyGlassPane();
        for (int i = 0; i < 35; i++) {
            Star star = new Star(new Point(random.nextInt(580), random.nextInt(550)));
            star.setColor(Color.orange);
            star.setxIncr(-3 + random.nextInt(7));
            star.setyIncr(-3 + random.nextInt(7));
            glass.add(star);
        }
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(glass, BorderLayout.CENTER);
        frame.setLocation(20, 20);
        frame.pack();
        frame.setVisible(true);

        DisabledGlassPane1 glassPane = new DisabledGlassPane1();
        JRootPane rootPane = SwingUtilities.getRootPane(frame);
        rootPane.setGlassPane(glassPane);
        glassPane.activate("");
    }

    private class MyGlassPane extends JLabel {

        private static final long serialVersionUID = 1L;
        private ArrayList<Star> stars = new ArrayList<Star>();
        private javax.swing.Timer timer = new javax.swing.Timer(20, new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                for (Star star : stars) {
                    star.move();
                }
                repaint();
            }
        });

        public void stopAnimation() {
            if (timer.isRunning()) {
                timer.stop();
            }
        }

        public void startAnimation() {
            if (!timer.isRunning()) {
                timer.start();
            }
        }

        @Override
        public void addNotify() {
            super.addNotify();
            timer.start();
        }

        @Override
        public void removeNotify() {
            super.removeNotify();
            timer.stop();
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(new Dimension(620, 620));
        }

        public MyGlassPane() {
            this.setPreferredSize(new Dimension(620, 620));
        }

        public void add(Star star) {
            stars.add(star);
        }

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            ((Graphics2D) g).setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            for (Star star : stars) {
                g.setColor(star.getColor());
                g.fillPolygon(star);
            }
        }
    }

    class DisabledGlassPane1 extends JComponent implements KeyListener {

        private static final long serialVersionUID = 1L;

        public DisabledGlassPane1() {
            setOpaque(false);
            Color base = UIManager.getColor("inactiveCaptionBorder");
            Color background = new Color(base.getRed(), base.getGreen(), base.getBlue(), 128);
            setBackground(background);
            setLayout(new GridBagLayout());
            add(message, new GridBagConstraints());
            message.setOpaque(true);
            message.setBorder(MESSAGE_BORDER);
            addMouseListener(new MouseAdapter() {
            });
            addMouseMotionListener(new MouseMotionAdapter() {
            });
            addKeyListener(this);
            setFocusTraversalKeysEnabled(false);
            Random random = new Random();
            for (int i = 0; i < 50; i++) {
                Star star = new Star(new Point(random.nextInt(490), random.nextInt(490)));
                star.setColor(Color.magenta);
                star.setxIncr(-3 + random.nextInt(7));
                star.setyIncr(-3 + random.nextInt(7));
                add(star);
            }
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            ((Graphics2D) g).setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            for (Star star : stars) {
                g.setColor(star.getColor());
                g.fillPolygon(star);
            }
        }

        @Override
        public void setBackground(Color background) {
            super.setBackground(background);
            Color messageBackground = new Color(background.getRGB());
            message.setBackground(messageBackground);
        }

        public void keyPressed(KeyEvent e) {
            e.consume();
        }

        public void keyTyped(KeyEvent e) {
        }

        public void keyReleased(KeyEvent e) {
            e.consume();
        }

        public void activate(String text) {
            if (text != null && text.length() > 0) {
                message.setVisible(true);
                message.setText(text);
                message.setForeground(getForeground());
            } else {
                message.setVisible(false);
            }
            setVisible(true);
            //setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
            requestFocusInWindow();
        }

        public void deactivate() {
            setCursor(null);
            setVisible(false);
        }
        private javax.swing.Timer timer = new javax.swing.Timer(15, new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                for (Star star : stars) {
                    star.move();
                }
                repaint();
            }
        });

        public void stopAnimation() {
            if (timer.isRunning()) {
                timer.stop();
            }
        }

        public void startAnimation() {
            if (!timer.isRunning()) {
                timer.start();
            }
        }

        @Override
        public void addNotify() {
            super.addNotify();
            timer.start();
        }

        @Override
        public void removeNotify() {
            super.removeNotify();
            timer.stop();
        }

        public void add(Star star) {
            stars.add(star);
        }
    }

    private class Star extends Polygon {

        private static final long serialVersionUID = 1L;
        private Point location = null;
        private Color color = Color.YELLOW;
        private int xIncr, yIncr;
        static final int WIDTH = 600, HEIGHT = 600;

        Star(Point location) {
            int x = location.x;
            int y = location.y;
            this.location = location;
            this.addPoint(x, y + 8);
            this.addPoint(x + 8, y + 8);
            this.addPoint(x + 11, y);
            this.addPoint(x + 14, y + 8);
            this.addPoint(x + 22, y + 8);
            this.addPoint(x + 17, y + 12);
            this.addPoint(x + 21, y + 20);
            this.addPoint(x + 11, y + 14);
            this.addPoint(x + 3, y + 20);
            this.addPoint(x + 6, y + 12);
        }

        public void setColor(Color color) {
            this.color = color;
        }

        public void move() {
            if (location.x < 0 || location.x > frame.getContentPane().getWidth() - 20) {
                xIncr = -xIncr;
            }
            if (location.y < 0 || location.y > frame.getContentPane().getHeight() - 20) {
                yIncr = -yIncr;
            }
            translate(xIncr, yIncr);
            location.setLocation(location.x + xIncr, location.y + yIncr);
        }

        public void setxIncr(int xIncr) {
            this.xIncr = xIncr;
        }

        public void setyIncr(int yIncr) {
            this.yIncr = yIncr;
        }

        public Color getColor() {
            return color;
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                MultiplayGlassPane Mpgp = new MultiplayGlassPane();
            }
        });
    }
}

Answer 1

看看 http://docs.oracle.com/javase/tutorial/uiswing /components/rootpane.html 有关根窗格以及玻璃窗格实际是什么的说明。

玻璃窗格只是添加具有根窗格大小并阻止所有输入事件的组件的便捷方法。这使您可以捕获与组件的任何交互，以创建“请稍候...”屏幕。

每个根容器只有一个玻璃板。 您不能分层玻璃板。

如果您想在当前玻璃板上叠加某些内容，则可以用其他内容替换玻璃板的内容。您还可以将 JPanel 设置为玻璃窗格，这样您就可以在玻璃窗格中布局多个组件。

通常，您应该只使用玻璃窗格来阻止用户输入（并且，如有必要，显示某种“请稍候”消息）。您能否提供一个用例来说明为什么要将玻璃板彼此叠放？