Question

我有一个执行搜索的简单Swing Java应用程序，结果显示在新选项卡中。搜索正在运行时，我想在选项卡的标题中显示进度图标或动画。我尝试添加一个gif图标，但它没有动画。有没有理由说这不起作用？

Answer 1

Swing tutorial about progress bars（并显示一般进展）是一个非常好的起点。它向您展示了如何使用SwingWorker在工作线程上执行持久操作，并以特定间隔更新UI以向用户显示持久操作的进度。还有另一个教程可以获得有关SwingWorker and concurrency in Swing

的更多信息

和往常一样，这个网站充满了例子。例如，a previous answer of mine使用SwingWorker类向用户显示进度

修改的

因为我错过了问题的标题部分。您可以创建“进度图标”并在选项卡上进行设置。然后可以使用SwingWorker来更新图标。

这种图标的示例是 example progress icon ，它基本上是每次进行某些进展时旋转的图像。 tabbed pane tutorial向您展示了如何向标签添加图标（甚至使用自定义组件）

EDIT2

因为看起来我的Mac与JDK1.7组合使得在其他系统上显示GIF动画更加容易，我创建了一个小型SSCCE，与Andrew的相似，但是带有旋转图标，但没有看起来它是由“疯狂的黑猩猩”创造出来的。旋转图标代码来自this site（我使用了精简版并添加了计时器）。我唯一不高兴的事实是我需要将选项卡式窗格传递给旋转图标才能触发。可能的解决办法是将计时器拉到RotatingIcon级以外，但是，它只是一个SSCCE。图片不包括在内，但可以在Google上找到。

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTabbedPane;
import javax.swing.Timer;
import java.awt.Component;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.AffineTransform;

public class ProgressTabbedPane {

  public static void main( String[] args ) {
    EventQueue.invokeLater( new Runnable() {
      @Override
      public void run() {
        JFrame frame = new JFrame( "RotatingIcon" );
        JTabbedPane tabbedPane = new JTabbedPane(  );
        tabbedPane.addTab( "Searching", new RotatingIcon( new ImageIcon( "resources/images/progress-indeterminate.png" ), tabbedPane ),
                           new JLabel( new ImageIcon( "resources/images/rotatingIcon.gif" ) ) );
        frame.getContentPane().add( tabbedPane );
        frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        frame.pack();
        frame.setVisible( true );
      }
    } );
  }

  private static class RotatingIcon implements Icon{
    private final Icon delegateIcon;
    private double angleInDegrees = 90;
    private final Timer rotatingTimer;
    private RotatingIcon( Icon icon, final JComponent component ) {
      delegateIcon = icon;
      rotatingTimer = new Timer( 100, new ActionListener() {
        @Override
        public void actionPerformed( ActionEvent e ) {
          angleInDegrees = angleInDegrees + 10;
          if ( angleInDegrees == 360 ){
            angleInDegrees = 0;
          }
          component.repaint();
        }
      } );
      rotatingTimer.setRepeats( false );
      rotatingTimer.start();
    }

    @Override
    public void paintIcon( Component c, Graphics g, int x, int y ) {
      rotatingTimer.stop();
      Graphics2D g2 = (Graphics2D )g.create();
      int cWidth = delegateIcon.getIconWidth() / 2;
      int cHeight = delegateIcon.getIconHeight() / 2;
      Rectangle r = new Rectangle(x, y, delegateIcon.getIconWidth(), delegateIcon.getIconHeight());
      g2.setClip(r);
      AffineTransform original = g2.getTransform();
      AffineTransform at = new AffineTransform();
      at.concatenate(original);
      at.rotate(Math.toRadians( angleInDegrees ), x + cWidth, y + cHeight);
      g2.setTransform(at);
      delegateIcon.paintIcon(c, g2, x, y);
      g2.setTransform(original);
      rotatingTimer.start();
    }

    @Override
    public int getIconWidth() {
      return delegateIcon.getIconWidth();
    }

    @Override
    public int getIconHeight() {
      return delegateIcon.getIconHeight();
    }
  } 
}

截图供参考。遗憾的是，图标不会在屏幕截图中旋转。 SSCCE screenshot

Answer 2

Animated image as tab icon

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;

public class ImageOnTab {

    ImageOnTab() {

        final BufferedImage image = new BufferedImage(
            32,32,BufferedImage.TYPE_INT_RGB);
        final JTabbedPane pane = new JTabbedPane();
        ImageIcon icon = new ImageIcon(image);
        pane.addTab( "Progress", icon, new JTree() );

        ActionListener listener = new ActionListener() {

            int x = 0;
            int step = 1;

            public void actionPerformed(ActionEvent ae) {
                Graphics g = image.createGraphics();
                x+=step;
                if (step>0) {
                    if (x>32) {
                        step=-step;
                    }
                } else if (x<0) {
                    step=-step;
                }

                g.setColor(Color.ORANGE);
                g.fillRect(0,0,32,32);

                g.setColor(Color.RED);
                g.fillRect(0,0,x,32);

                g.dispose();

                pane.repaint();
            }
        };

        Timer timer = new Timer(100,listener);
        timer.start();

        JOptionPane.showMessageDialog(null, pane);
    }

    public static void main(String[] args) throws Exception {
        //Create the GUI on the event dispatching thread
        SwingUtilities.invokeLater(new Runnable(){
            @Override
            public void run() {
                new ImageOnTab();
            }
        });
    }
}

Answer 3

@Andrew Thompson

It would be great if the J2SE supported animated GIFs 'out of the box' 
in more situations. I tried that animated GIF (nice image, BTW) as a 
tab icon, and no, it remains static.

我不想读整篇....但是把你的代码和@ trashgod陛下放在一起

1）使用Htlm（我在普通的Html中表现不佳）

2）将GlassPane与JLabel#(setOpaque(true))

一起使用

3）使用JLayer（JXLayer更好，因为Sn'Oracle删除了重要的方法==我的观点）

4）你必须force ..... for Swing JComponents by @aterai

5）Rob's Animated Icon几次提到Rob对JTabbedPane

的支持

码

import java.awt.*;
import java.awt.event.*;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Random;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.*;
//https://stackoverflow.com/questions/3483485/java-jprogressbar-or-equivalent-in-a-jtabbedpane-tab-title/3484251#3484251
public class JTabbedTest {

    private JFrame f = new JFrame();
    private JTabbedPane jtp = new JTabbedPane();
    private URL url = null;

    public JTabbedTest() {
        try {
            url = new URL("http://pscode.org/media/starzoom-thumb.gif");
        } catch (MalformedURLException ex) {
            Logger.getLogger(JTabbedTest.class.getName()).log(Level.SEVERE, null, ex);
        }
        ImageIcon ii = new ImageIcon(url);

        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jtp.setPreferredSize(new Dimension(400, 200));
        createTab("Reds", Color.RED);
        createTab("Greens", Color.GREEN);
        createTab("Blues", Color.BLUE);
        f.add(jtp, BorderLayout.CENTER);

        jtp.setTitleAt(2, "<html><img src=" + ii + " width=20 height=20></img></html>");

        // change foreground Color for disabled tab        
        /*jtp.setTitleAt(2, "<html><font color=" + (jtp.isEnabledAt(2) ? "black" : "red") + ">"
                + jtp.getTitleAt(2) + "</font></html>");*/

        Rectangle tabBounds = jtp.getBoundsAt(0);
        Container glassPane = (Container) f.getRootPane().getGlassPane();
        glassPane.setVisible(true);
        glassPane.setLayout(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.weightx = 1.0;
        gbc.weighty = 1.0;
        gbc.fill = GridBagConstraints.NONE;
        gbc.insets = new Insets(tabBounds.y + 23, 0, 0, 5);
        gbc.anchor = GridBagConstraints.NORTHEAST;
        JButton button = new JButton("My Button Position", ii);
        button.setPreferredSize(new Dimension(button.getPreferredSize().width, (int) tabBounds.getHeight() - 2));
        glassPane.add(button, gbc);
        f.pack();
        f.setVisible(true);
    }

    private void createTab(String name, Color color) {
        ProgressIcon icon = new ProgressIcon(color);
        jtp.addTab(name, icon, new ColorPanel(jtp, icon));
    }

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

            @Override
            public void run() {
                JTabbedTest jTabbedTest = new JTabbedTest();
            }
        });
    }

    private static class ColorPanel extends JPanel implements ActionListener {

        private static final Random rnd = new Random();
        private static final long serialVersionUID = 1L;
        private final Timer timer = new Timer(1000, this);
        private final JLabel label = new JLabel("Stackoverflow!");
        private final JTabbedPane parent;
        private final ProgressIcon icon;
        private final int mask;
        private int count;

        public ColorPanel(JTabbedPane parent, ProgressIcon icon) {
            super(true);
            this.parent = parent;
            this.icon = icon;
            this.mask = icon.color.getRGB();
            this.setBackground(icon.color);
            label.setForeground(icon.color);
            this.add(label);
            timer.start();
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            this.setBackground(new Color(rnd.nextInt() & mask));
            this.icon.update(count += rnd.nextInt(8));
            this.parent.repaint();
        }
    }

    private static class ProgressIcon implements Icon {

        private static final int H = 16;
        private static final int W = 3 * H;
        private Color color;
        private int w;

        public ProgressIcon(Color color) {
            this.color = color;
        }

        public void update(int i) {
            w = i % W;
        }

        @Override
        public void paintIcon(Component c, Graphics g, int x, int y) {
            g.setColor(color);
            g.fillRect(x, y, w, H);
        }

        @Override
        public int getIconWidth() {
            return W;
        }

        @Override
        public int getIconHeight() {
            return H;
        }
    }
}

JTabbedPane：在选项卡中显示任务进度

3 个答案: