我怎样才能让这个 JButton 可见?当我有逐行扫描背景 JWindow() 时? [英] How can I make this JButton visible? When I have progressive scan background JWindow()?

问题描述

如何使 JButton 可见?

How can I make the JButton visible?

1) 当没有开启渐进式背景时:JButton 正在显示

1) When no progressive background is turned on: JButton is showing

2) 当没有开启渐进式背景时，按下 JButton 仍然没有闪烁:

2) When no progressive background is turned on, JButton is pressed still showing no flicker:

3) 当渐进式背景打开时，JButton 是不可见的，按下后我看到闪烁，JButton() 出现并再次隐藏自动.<<问题来了，我该如何解决?

3) When progressive background is turned on, JButton is invisible and on pressing in this I see flicker and JButton() appears and again hides auto. << Problem is here, so how can I fix it?

import java.awt.Color;
import java.awt.AlphaComposite;
import java.awt.BorderLayout;
import java.awt.Graphics;
import javax.swing.*;

import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;

public class ButtonTest extends JWindow implements MouseListener, MouseMotionListener {

    private static final long serialVersionUID = 1L;
    private JFrame frame = new JFrame();
    private SoftJButton softButton1;

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

            @Override
            public void run() {
                ButtonTest j = new ButtonTest();
                j.createAndShowGUI();
            }
        });
    }

    public void createAndShowGUI() {
        softButton1 = new SoftJButton("Transparent Button");
        softButton1.setBackground(Color.GREEN);
        softButton1.setAlpha(0.5f);
        softButton1.setDoubleBuffered(true);
        this.setLayout(new BorderLayout());
        this.setBounds(100, 30, 200, 100);
        this.setBackground(new Color(0, 0, 0, 255));
        this.setVisible(true);
        add(softButton1);
    }

    @Override
    public void paint(Graphics g) {
        super.paint(g);
    }

    public void mouseDragged(MouseEvent e) {
    }

    public void mousePressed(MouseEvent e) {
    }

    public void mouseMoved(MouseEvent e) {
    }

    public void mouseClicked(MouseEvent e) {
    }

    public void mouseReleased(MouseEvent e) {
    }

    public void mouseEntered(MouseEvent e) {
    }

    public void mouseExited(MouseEvent e) {
    }

    public static class SoftJButton extends JButton {

        private static final JButton lafDeterminer = new JButton();
        private static final long serialVersionUID = 1L;
        private boolean rectangularLAF;
        private float alpha = 1f;

        public SoftJButton() {
            this(null, null);
        }

        public SoftJButton(String text) {
            this(text, null);
        }

        public SoftJButton(String text, Icon icon) {
            super(text, icon);
            setOpaque(false);
            setFocusPainted(false);
        }

        public float getAlpha() {
            return alpha;
        }

        public void setAlpha(float alpha) {
            this.alpha = alpha;
            repaint();
        }

        @Override
        public void paintComponent(java.awt.Graphics g) {
            java.awt.Graphics2D g2 = (java.awt.Graphics2D) g;
            g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha));
            if (rectangularLAF && isBackgroundSet()) {
                Color c = getBackground();
                g2.setColor(c);
                g.fillRect(0, 0, getWidth(), getHeight());
            }
            super.paintComponent(g2);
        }

        @Override
        public void updateUI() {
            super.updateUI();
            lafDeterminer.updateUI();
            rectangularLAF = lafDeterminer.isOpaque();
        }
    }
}

推荐答案

不清楚您的视频源是如何工作的，但由于 混合重量级和轻量级组件.尽管 awt 组件不透明，但您始终可以在 Frame 上绘制自己的半透明文本并进行手动命中测试，如下所示.您还可以检查您的视频源 API 是否支持 Double缓冲和翻页.

It's not clear how your video source works, but it appears to be incompatible with Swing due to Mixing Heavyweight and Lightweight Components. Although awt components aren't transparent, you can always draw your own translucent text on the Frame and do manual hit testing, as suggested below. You might also check to see if your video source API supports Double Buffering and Page Flipping.

import java.awt.Color;
import java.awt.AlphaComposite;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.geom.Rectangle2D;

/** @see http://stackoverflow.com/questions/6725618 */
public class AlphaFrame extends Frame {

    private static final Font font = new Font("Dialog", Font.BOLD, 24);
    private float alpha = 1f;
    private Rectangle rect = new Rectangle();

    public static void main(String[] args) {
        AlphaFrame af = new AlphaFrame();
        af.setTitle("Translucent Button");
        af.setAlpha(0.5f);
        af.setForeground(Color.green);
        af.setBackground(Color.black);
        af.setVisible(true);
    }

    public AlphaFrame() {
        this.setSize(320, 240);
        this.setLocationRelativeTo(null);
        this.setBackground(Color.white);
        this.addWindowListener(new WindowAdapter() {

            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        this.addMouseListener(new MouseAdapter() {

            @Override
            public void mousePressed(MouseEvent e) {
                if (rect.contains(e.getPoint())) {
                    System.out.println("Pressed.");
                }
            }
        });
        repaint();
    }

    @Override
    public void paint(Graphics g) {
        super.paint(g);
        Graphics2D g2 = (Graphics2D) g;
        g2.setComposite(AlphaComposite.getInstance(
            AlphaComposite.SRC_OVER, alpha));
        g2.setColor(getForeground());
        g2.setFont(font);
        FontMetrics fm = g2.getFontMetrics();
        String s = getTitle();
        Insets i = getInsets();
        int dx = i.left + 10;
        int dy = i.top + fm.getHeight() + 10;
        Rectangle2D bounds = fm.getStringBounds(s, g);
        rect.x = dx + (int) bounds.getX() - 1;
        rect.y = dy + (int) bounds.getY() - 1;
        rect.width = (int) bounds.getWidth() + 1;
        rect.height = (int) bounds.getHeight() + 1;
        System.out.println(i + " 
" + bounds + "
" + rect);
        g2.drawRect(rect.x, rect.y, rect.width, rect.height);
        g2.drawString(s, dx, dy);
    }

    public float getAlpha() {
        return alpha;
    }

    public void setAlpha(float alpha) {
        this.alpha = alpha;
    }
}

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