创建一个消失的JPanel? [英] Create a disappearing JPanel?

问题描述

我正在尝试创建扩展的JPanel，以突出显示屏幕的某些区域.我已经从此SO答案中获取了一些代码，但是我想进一步扩展它，尽管我不确定如何去做.

I am trying to create an extended JPanel that acts as a way to highlight some region of the screen. I have taken some code from this SO answer but would like to extend it further though I am not sure how to go about it.

我希望能够在达到给定的超时后让我的JPanel(以下为MatchAreaPanel)消失.即JPanel将其visible属性设置为false，然后对其进行处理.

I would like to be able to have my JPanel (MatchAreaPanel below) disappear after a given timeout is reached. That is the JPanel sets its visible property to false and subsequently disposes of itself.

执行此操作的最佳方法是什么?

What would be the best way to go about doing this?

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JPanel;

public class MatchAreaPanel extends JPanel
{
    public MatchAreaPanel()
    {

    }

    @Override
    protected void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g.create();
        g2d.setColor(new Color(128, 128, 128, 64));
        g2d.fillRect(0, 0, getWidth(), getHeight());

        float dash1[] = {10.0f};
        BasicStroke dashed = new BasicStroke(3.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 10.0f, dash1, 0.0f);
        g2d.setColor(Color.BLACK);
        g2d.setStroke(dashed);
        g2d.drawRect(0, 0, getWidth() - 3, getHeight() - 3);
        g2d.dispose();
    }
}

推荐答案

例如，您可以使用Swing Timer在给定的延迟后简单地安排回调，并根据需要关闭关联的窗口或隐藏组件. ...

You could use a Swing Timer to simply schedule a callback after a given delay and close the associated window or hide the component based on your needs, for example...

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Random;
import javax.swing.JPanel;
import javax.swing.JWindow;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Test {

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

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                Rectangle bounds = getVirtualBounds();
                Random rnd = new Random();
                int x = bounds.x + (rnd.nextInt(bounds.width) - 100);
                int y = bounds.y + (rnd.nextInt(bounds.height) - 100);

                MatchAreaPanel pane = new MatchAreaPanel();
                JWindow frame = new JWindow();
                frame.setBackground(new Color(0, 0, 0, 0));
                frame.add(pane);
                frame.setBounds(x, y, 100, 100);
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
                pane.start();
            }
        });
    }

    public static Rectangle getVirtualBounds() {

        Rectangle bounds = new Rectangle(0, 0, 0, 0);

        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice gd = ge.getDefaultScreenDevice();
        bounds.add(gd.getDefaultConfiguration().getBounds());

        return bounds;

    }

    public class MatchAreaPanel extends JPanel {

        public MatchAreaPanel() {
            setOpaque(false);
            addMouseListener(new MouseAdapter() {
                @Override
                public void mouseClicked(MouseEvent e) {
                    SwingUtilities.windowForComponent(MatchAreaPanel.this).dispose();
                }
            });
        }

        public void start() {
            Timer timer = new Timer(5000, new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    SwingUtilities.windowForComponent(MatchAreaPanel.this).dispose();
                }
            });
            timer.start();
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g.create();
            g2d.setColor(new Color(128, 128, 128, 64));
            g2d.fillRect(0, 0, getWidth(), getHeight());

            float dash1[] = {10.0f};
            BasicStroke dashed = new BasicStroke(3.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 10.0f, dash1, 0.0f);
            g2d.setColor(Color.BLACK);
            g2d.setStroke(dashed);
            g2d.drawRect(0, 0, getWidth() - 3, getHeight() - 3);
            g2d.dispose();
        }
    }

}

有关更多详细信息，请参见如何使用Swing计时器

See How to use Swing Timers for more details

已更新...

现在，简单地隐藏"面板很无聊，用户也有可能错过面板，因为突然出现并不能保证用户会看到它，因此，您可以添加淡出效果.

Now, simply "hiding" the panel is, boring, it's also possible for the user to miss the panel, as suddenly showing up is no guarantee that the user will see it, so instead, you could add in a fade out effect.

在此示例中，您可以通过单击面板来淡化面板(但是我在测试中做了此操作，因此您不需要它)，也可以在指定的超时时间之后...

In this example, you can fade the panel out by clicking it (but I did this as part of my testing, so you don't need it) or after the specified time out...

import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Random;
import javax.swing.JPanel;
import javax.swing.JWindow;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Test {

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

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                Rectangle bounds = getVirtualBounds();
                Random rnd = new Random();
                int x = bounds.x + (rnd.nextInt(bounds.width) - 100);
                int y = bounds.y + (rnd.nextInt(bounds.height) - 100);

                MatchAreaPanel pane = new MatchAreaPanel();
                JWindow frame = new JWindow();
                frame.setBackground(new Color(0, 0, 0, 0));
                frame.add(pane);
                frame.setBounds(x, y, 100, 100);
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
                pane.start();
            }
        });
    }

    public static Rectangle getVirtualBounds() {

        Rectangle bounds = new Rectangle(0, 0, 0, 0);

        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice gd = ge.getDefaultScreenDevice();
        bounds.add(gd.getDefaultConfiguration().getBounds());

        return bounds;

    }

    public static class MatchAreaPanel extends JPanel {

        protected static final long FADE_OUT_TIME = 2500;

        private float alpha = 1f;
        private long fadeStartAt;
        private Timer fadeTimer;
        private Timer waitTimer;

        public MatchAreaPanel() {
            setOpaque(false);
            addMouseListener(new MouseAdapter() {
                @Override
                public void mouseClicked(MouseEvent e) {
                    fadeOut();
                }
            });
            fadeTimer = new Timer(40, new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    long runTime = System.currentTimeMillis() - fadeStartAt;
                    float progress = 0f;
                    if (runTime >= FADE_OUT_TIME) {
                        progress = 1f;
                    } else {
                        progress = (float) runTime / (float) FADE_OUT_TIME;
                        if (progress > 1f) {
                            progress = 1f;
                        }
                    }
                    alpha = 1f - progress;

                    if (progress >= 1f) {
                        ((Timer) e.getSource()).stop();
                        SwingUtilities.windowForComponent(MatchAreaPanel.this).dispose();
                    }
                    repaint();
                }
            });
            waitTimer = new Timer(5000, new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    ((Timer) e.getSource()).stop();
                    fadeOut();
                }
            });
        }

        protected void fadeOut() {
            waitTimer.stop();
            fadeStartAt = System.currentTimeMillis();
            fadeTimer.start();
        }

        public void start() {
            if (!waitTimer.isRunning() && !fadeTimer.isRunning()) {
                waitTimer.start();
            }
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g.create();
            g2d.setComposite(AlphaComposite.SrcOver.derive(alpha));
            g2d.setColor(new Color(128, 128, 128, 64));
            g2d.fillRect(0, 0, getWidth(), getHeight());

            float dash1[] = {10.0f};
            BasicStroke dashed = new BasicStroke(3.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 10.0f, dash1, 0.0f);
            g2d.setColor(Color.BLACK);
            g2d.setStroke(dashed);
            g2d.drawRect(0, 0, getWidth() - 3, getHeight() - 3);
            g2d.dispose();
        }
    }

}

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