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POUpdating JProgressBar from separate class
 

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  1. POUpdating JProgressBar from separate class
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    <p>I've been following this thread to try to update a JProgressBar from a separate class in my program: <a href="https://stackoverflow.com/questions/13717826/java-progress-bar-is-it-possible-to-use-setprogess-of-progress-bar-outside">java - Progress Bar - Is it possible to use setProgess() of Progress Bar outside the doInBackground() method?</a></p> <p>Unfortunately my code isn't work properly. I probably missed something, but I can't seem to figure out what it was. This is the code I have written so far:</p> <p>Here is the propertyChangeListener I use to update the progress bar:</p> <pre><code>PropertyChangeListener listener = new PropertyChangeListener(){ public void propertyChange(PropertyChangeEvent event){ if("progress".equals(event.getPropertyName())){ progressBar.setValue((int)currentPercent); progressBar.setString(Integer.toString((int)currentPercent)); } } }; </code></pre> <p>SwingWorker class:</p> <pre><code>class Task extends SwingWorker&lt;Void, String&gt;{ public Task(){ md = new ManipulateDirectories(this); } @Override public Void doInBackground(){ for(int i = 0; i &lt; directories.length; i++){ md.copyDirectory(directories[i], backupDir); } return null; } @Override public void process(List&lt;String&gt; chunks){ } @Override public void done(){ closeWindow(); } public void updateProgress(int tick){ setProgress(tick); } } </code></pre> <p>ManipulateDirectories class:</p> <pre><code>public class ManipulateDirectories{ Task task; public ManipulateDirectories(Task task){ this.task = task; } //Recursive function to loop through and copy individual files public void copyDirectory(File file, File dest){ if(file.isFile()){ try { FileUtils.copyFileToDirectory(file, dest); currentSize = currentSize + getDirSize(file); if(currentSize &gt;= ONE_PERCENT){ currentPercent = currentPercent + (currentSize / ONE_PERCENT); task.updateProgress((int)currentPercent); //THIS LINE DOES NOT WORK currentSize = currentSize % ONE_PERCENT; } } catch (IOException e) { e.printStackTrace(); } } else if (file.isDirectory()){ File newDir = new File(String.format("%s\\%s", dest.getAbsolutePath(), file.getName())); if(!newDir.exists()){ newDir.mkdir(); for(File f : file.listFiles()){ copyDirectory(f, newDir); } } } } public Long getDirSize(File file) { long size = 0L; if (file.isFile() &amp;&amp; file != null){ size += file.isDirectory() ? getDirSize(file) : file.length(); } else if (file.isDirectory()){ for (File f : file.listFiles()) { size += f.isDirectory() ? getDirSize(f) : file.length(); } } return size; } } </code></pre> <p>As you can see, the propertyChangeListener should be fired by the updateProgress(int) method within the swingworker class, and that method should be called by the line: <code>task.updateProgress((int)currentPercent)</code> which is in the ManipulateDirectories class. However, that line does not seem to call updateProgress(). I am guessing it might be a problem with the particular instance of "Task"--perhaps I am creating a separate instance that does not have the correct context? (I know the terminology is probably a bit wrong, but hopefully you can understand what I'm trying to say). Can anyone spot my mistake/s? Any help would be very much appreciated, I've been stuck on this for quite a while now.</p> <p>SSCCE:</p> <pre><code>import java.awt.BorderLayout; import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowEvent; import java.beans.PropertyChangeEvent; import java.beans.PropertyChangeListener; import javax.swing.BorderFactory; import javax.swing.BoxLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JProgressBar; import javax.swing.SwingWorker; import javax.swing.border.EmptyBorder; public class MainClass extends JFrame { private JProgressBar progressBar; private DoSomething ds; private int currentPercent = 0; private Task task; private static JPanel contentPane; private JPanel bottomPane; private JButton btnCancel; public static void main(String[] args){ MainClass mc = new MainClass(); mc.createGUI(); } public void createGUI(){ //Create frame setTitle("Backup Progress"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 350); //Create content pane contentPane = new JPanel(new BorderLayout()); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); //Create panel for progress bar/cancel button bottomPane = new JPanel(); bottomPane.setLayout(new BoxLayout(bottomPane, BoxLayout.Y_AXIS)); progressBar = new JProgressBar(0, 100); progressBar.setStringPainted(true); progressBar.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5)); progressBar.setValue(0); btnCancel = new JButton("Cancel"); btnCancel.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { closeWindow(); } }); bottomPane.add(progressBar); bottomPane.add(btnCancel); contentPane.add(bottomPane, BorderLayout.SOUTH); PropertyChangeListener listener = new PropertyChangeListener(){ public void propertyChange(PropertyChangeEvent event){ if("progress".equals(event.getPropertyName())){ progressBar.setValue((int)currentPercent); progressBar.setString(Integer.toString((int)currentPercent)); } } }; setVisible(true); task = new Task(); task.execute(); } class Task extends SwingWorker&lt;Void, String&gt;{ public Task(){ ds = new DoSomething(this); } @Override public Void doInBackground(){ for(int i = 0; i &lt; 100; i++){ ds.incrementPercent(); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } return null; } @Override public void done(){ closeWindow(); } public void updateProgress(int tick){ setProgress(currentPercent + tick); } } public class DoSomething{ Task task; public DoSomething(Task task){ this.task = task; } public void incrementPercent(){ task.updateProgress(1); } } public void closeWindow(){ WindowEvent close = new WindowEvent(this, WindowEvent.WINDOW_CLOSING); Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(close); } } </code></pre> <p>I realize that's a very long SSCCE, but hopefully it gives you all the information you need to know.</p>
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    1. COI apologize, I never noticed the swing tag was added. I will remember that from now on. I will put together a quick SSCCE in just a moment.
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    3. COWhat does `ONE_PERCENT` equal, what is `currentSize` and `currentPercent` declared as? Your code snippet is really pointless as it does not describe enough of what you are doing to be helpful...
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