You are calling doInBackground() directly from your code, something that is akin to calling run() directly in a runnable. This means that your code is not in fact running on a background thread, and so you are likely clobbering the event thread with long running code, preventing the Swing GUI, and your progress bar, from … Read more
Several things: There are four rules to follow with SwingWorker. You can refer to this diagram: . So, this code: @Override public String doInBackground() { //download here label.setText(“test”); violates that rule. Your label.setText() should be moved to the constructor. To send “updates” to Swing components (like your progress bar) you want to use the process() … Read more
Your showProgress method is being executed within the context of the Event Dispatching Thread. The EDT is responsible for, amongst other things, processing paint requests. This means that so long as your for-loop is executing, the EDT can not process any new paint requests (or handle the invokeLater events either) as it is blocking the … Read more
The setProgress() API notes: “For performance purposes all these invocations are coalesced into one invocation with the last invocation argument only.” Adding Thread.sleep(1) simply defers the coalescence; invoking println() introduces a comparable delay. Take heart that your file system is so fast; I would be reluctant to introduce an artificial delay. As a concrete example … Read more
There are a number of ways you might achieve this, one of the better ways would be to create a custom ProgressBarUI delegate which paints itself the way you want, for example… public class FancyProgressBar extends BasicProgressBarUI { @Override protected Dimension getPreferredInnerVertical() { return new Dimension(20, 146); } @Override protected Dimension getPreferredInnerHorizontal() { return new … Read more
Here is a basic example, this basically uses a SwingWorker to scan the root directory of your drive and lists all the files. Once that’s completed, it will attempt to read each file, in it’s own SwingWorker updating the table as it goes. Disclaimer: This is an example. I use a Thread.sleep to slow the … Read more
The Swing tutorial about progress bars (and showing progress in general) is a very good place to start. It shows you how to perform long-lasting operations on a worker thread by using a SwingWorker, and updating your UI at certain intervals to show progress of the long-lasting operation to the user. There is another tutorial … Read more
I think that these values are right for you UIManager.put(“ProgressBar.background”, Color.ORANGE); UIManager.put(“ProgressBar.foreground”, Color.BLUE); UIManager.put(“ProgressBar.selectionBackground”, Color.RED); UIManager.put(“ProgressBar.selectionForeground”, Color.GREEN);
For earlier versions, you might try addTab() with a suitable implementation of Icon used to indicate progress. import java.awt.*; import java.awt.event.*; import java.util.Random; import javax.swing.*; public class JTabbedTest { public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { private final JTabbedPane jtp = new JTabbedPane(); public void run() { JFrame f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); … Read more
It’s difficult to tell from the code sample you’ve provide… The main cause of this problem is trying to update the UI while blocking from the Event Dispatching Thread (EDT). It’s important to NEVER do any long running or blocking operations within the EDT as this will prevent repaint requests from been acted upon. For … Read more