Adding multiple JProgressBar to TableColumn JTable

Question

I added some JProgressBar to the TableColumn from JTable .

I am updating all JProgressBar with data after performing certain calculations, but only the last ProgressBar (in this case, ProgressBar progressObj4 ) is being updated, which is being updated.

How to update all ProgressBar s?

The basic requirement is that at boot time I show the status of the executable file. I am currently hard-coded 4 progress bars to check if all update progress bars update by file status, but I need to create them dynamically. The total number of progress indicators does not match the number of files that are being downloaded. Also, how can I get individual instances of progress indicators and update their status?

I am attaching the source code to the progress bar by adding it to the table column.

 //tc = object of TableColumn progressObj1 = new ProgressBarRenderer("Progress1"); progressObj1.setValue(0); progressObj1.setStringPainted(true); progressObj1.setBackground(Color.WHITE); progressObj1.setBorderPainted(true); tc.setCellRenderer(progressObj1); progressObj2 = new ProgressBarRenderer("Progress2"); progressObj2.setValue(0); progressObj2.setStringPainted(true); progressObj2.setBackground(Color.WHITE); progressObj2.setBorderPainted(true); tc.setCellRenderer(progressObj2); progressObj3 = new ProgressBarRenderer("Progress3"); progressObj3.setValue(0); progressObj3.setStringPainted(true); progressObj3.setBackground(Color.WHITE); progressObj3.setBorderPainted(true); tc.setCellRenderer(progressObj3); progressObj4 = new ProgressBarRenderer("Progress4"); progressObj4.setValue(0); progressObj4.setStringPainted(true); progressObj4.setBackground(Color.WHITE); progressObj4.setBorderPainted(true); tc.setCellRenderer(progressObj4); 

Answer 1

There are basically two ways to navigate using JProgressBar using SwingWorker and Runnable # Thread, an example for SwingWorker

 import java.awt.*; import java.util.*; import javax.swing.*; import javax.swing.table.*; public class TableCellProgressBar { private String[] columnNames = {"String", "ProgressBar"}; private Object[][] data = {{"dummy", 100}}; private DefaultTableModel model = new DefaultTableModel(data, columnNames) { private static final long serialVersionUID = 1L; @Override public Class<?> getColumnClass(int column) { return getValueAt(0, column).getClass(); } @Override public boolean isCellEditable(int row, int col) { return false; } }; private JTable table = new JTable(model); public JComponent makeUI() { TableColumn column = table.getColumnModel().getColumn(1); column.setCellRenderer(new ProgressRenderer()); EventQueue.invokeLater(new Runnable() { @Override public void run() { startTask("test"); startTask("error test"); startTask("test"); } }); JPanel p = new JPanel(new BorderLayout()); p.add(new JScrollPane(table)); return p; } //http://java-swing-tips.blogspot.com/2008/03/jprogressbar-in-jtable-cell.html private void startTask(String str) { final int key = model.getRowCount(); SwingWorker<Integer, Integer> worker = new SwingWorker<Integer, Integer>() { private int sleepDummy = new Random().nextInt(100) + 1; private int lengthOfTask = 120; @Override protected Integer doInBackground() { int current = 0; while (current < lengthOfTask && !isCancelled()) { if (!table.isDisplayable()) { break; } if (key == 2 && current > 60) { //Error Test cancel(true); publish(-1); return -1; } current++; try { Thread.sleep(sleepDummy); } catch (InterruptedException ie) { break; } publish(100 * current / lengthOfTask); } return sleepDummy * lengthOfTask; } @Override protected void process(java.util.List<Integer> c) { model.setValueAt(c.get(c.size() - 1), key, 1); } @Override protected void done() { String text; int i = -1; if (isCancelled()) { text = "Cancelled"; } else { try { i = get(); text = (i >= 0) ? "Done" : "Disposed"; } catch (Exception ignore) { ignore.printStackTrace(); text = ignore.getMessage(); } } System.out.println(key + ":" + text + "(" + i + "ms)"); } }; model.addRow(new Object[]{str, 0}); worker.execute(); } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { createAndShowGUI(); } }); } public static void createAndShowGUI() { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); frame.getContentPane().add(new TableCellProgressBar().makeUI()); frame.setSize(320, 240); frame.setLocationRelativeTo(null); frame.setVisible(true); } } class ProgressRenderer extends DefaultTableCellRenderer { private final JProgressBar b = new JProgressBar(0, 100); public ProgressRenderer() { super(); setOpaque(true); b.setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1)); } @Override public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { Integer i = (Integer) value; String text = "Completed"; if (i < 0) { text = "Error"; } else if (i < 100) { b.setValue(i); return b; } super.getTableCellRendererComponent(table, text, isSelected, hasFocus, row, column); return this; } } 

Answer 2

To my knowledge, the renderer applies to all rows in this column. It seems to me that you would like to apply several renderers to one column. Also, it also seems like you are trying to provide cell rendering status.

I believe that this will help render the rendering void and have the renderer getTableCellRendererComponent () method take care of setting various properties (JProgressBar) based on the values ​​from the current row before rendering renders the cell.

In other words, you only need to call tc.setCellRenderer () once for any given column, and then process the drawer to draw a column for any row (based on, say, the underlying data model for this table).