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。在搜索运行时，我想在选项卡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。这不起作用有什么原因吗？
【问题讨论】：
JProgressBar，或者是显示任何进度的通用进度条（在选项卡式窗格之外）选项卡被选中。 “有什么建议吗？tnx” 1) 不要那样做。 2）正确拼写“谢谢”之类的词，或者更好的是，将它们排除在外——它们是噪音。
标签： java swing jtabbedpane jprogressbar
Swing tutorial about progress bars（并显示总体进展）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，并以特定间隔更新您的 UI 以向用户显示持久操作的进度。有关SwingWorker and concurrency in Swing
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
编辑
因为我错过了您问题的 标签标题 部分。您可以创建一个“进度图标”并将其设置在选项卡上。然后可以使用SwingWorker 更新图标。
是此类图标的一个示例，它基本上是您每次取得一些进展时都会旋转的图像。 tabbed pane tutorial 向您展示了如何将图标添加到选项卡（甚至使用自定义组件）
编辑2
我的 Mac 与 JDK1.7 的结合似乎比在其他系统上更容易显示动画 gif，我也创建了一个小型 SSCCE，与 Andrew 的非常相似，但带有一个旋转图标看起来它是由“疯狂的黑猩猩”创造的，我引用了“疯狂的黑猩猩”。旋转图标代码来自this site（我使用了精简版并添加了计时器）。唯一让我不太高兴的是我需要将选项卡式窗格传递给旋转图标才能触发。可能的解决方案是将计时器拉到 RotatingIcon 类之外，但是嘿，它只是一个 SSCCE 。图片不包括在内，但通过 Google 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，屏幕截图中的图标没有旋转。
【讨论】：
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();
}
});
}
}
【讨论】：
@安德鲁汤普森
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.
我不想读完整个......，而是把你和@trashgod 陛下的代码放在一起
1）使用Htlm（我不擅长纯Html）
2) 将GlassPane 与JLabel#(setOpaque(true)) 一起使用
3) 使用JLayer（JXLayer 更好，因为 Sn'Oracle 删除重要方法 == 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
代码
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;
}
}
}
【讨论】：