Problem with the rendering of JProgressBar in JTable

I have some problems with the rendering of JProgressBar in JTable. In the case of several lines, when a progress bar is updated, and its text is changing, then he painted all the progress bars in this column.

Here is my code I used to create the table:
--------------------------------------------------------------------------------------

JTable convertTable = new JTable(convertTableModel) {

            public Component prepareRenderer(TableCellRenderer renderer,
                    int rowIndex, int vColIndex) {
                Component c = null;
                if (renderer != null) {
                    c = super.prepareRenderer(renderer, rowIndex, vColIndex);

                    if (vColIndex == INDEX_CONVERT_STATUS) {
                        //System.out.println("c = "+c.getClass());
                        if(c instanceof JProgressBar) {
                            //System.out.println("inside = ");
                            c.setBackground(Color.BLUE);
                        }
                    }
                }
                return c;
            }

            public boolean isCellEditable(int rowIndex, int mColIndex) {
                if (mColIndex == INDEX_CONVERT_SELECT) {
                    return true;
                } else if (mColIndex == INDEX_CONVERT_STATUS) {
                    return false;
                } else {
                    return false;
                }
            }

            /*
             * JTable uses this method to determine the default renderer/
             * editor for each cell.  If we didn't implement this method,
             * then the last column would contain text ("true"/"false"),
             * rather than a check box.
             */
            public Class getColumnClass(int c) {
                if (getValueAt(0, c) != null) {
                    return getValueAt(0, c).getClass();
                }
                return null;
            }
        };

--------------------------------------------------------------------------------------

Then I applied on this table rendering engine

---------------------------------------------------------------------------------------

// Applying JProgressBar Renderer for convert table
        TableColumn col = convertTable.getColumnModel().getColumn(INDEX_CONVERT_STATUS);
        ProgressBarRenderer progressBarRenderer = new ProgressBarRenderer();
        col.setCellRenderer(progressBarRenderer);

---------------------------------------------------------------------------------------

Class code ProgressBarRenderer is as follows:
---------------------------------------------------------------------------------------

public class ProgressBarRenderer extends JProgressBar implements TableCellRenderer {

    private Hashtable ht = new Hashtable();

    public ProgressBarRenderer() {
        super(0);
        this.setMinimum(0);
        this.setMaximum(100);
        this.setStringPainted(true);
        this.setBorderPainted(true);

        UIDefaults defaults = UIManager.getDefaults();
        Font font = new Font("Arial", Font.BOLD, 12);
        defaults.put("ProgressBar.font", font);
    }

    public void setRowEnabled(int row, boolean enabled) {
        ht.put(row, enabled);
    }

    public void setForeground(Color c, int row) {
        //System.out.println("setString ht = " + ht.size() + "  row= " + row + "  Selected= " + (Boolean) ht.get(row) + " color= " + c);
        if (ht.isEmpty()) {
            this.setForeground(c);
        } else if (ht.size() == 1) {
            this.setForeground(c);
        } else if ((Boolean) ht.get(row)) {
            this.setForeground(c);            
        } else {
            this.setForeground(c);
        }
    }

    public void setString(String s, int row) {

        //System.out.println("setString ht = " + ht.size() + "  row= " + row + " text= " + s);
        if (ht.isEmpty()) {
            this.setString(s);
        } else if (ht.size() == 1) {
            this.setString(s);
        } else if ((Boolean) ht.get(row)) {
            this.setString(s);
        } else {
            this.setString(s);
        }

    }

    @Override
    public Component getTableCellRendererComponent(JTable table,
            Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        
        //System.out.println("getTableCellRendererComponent = " + table);
        //System.out.println("Renderer ht = " + ht.size() + "  row= " + row + "  Selected= " + (Boolean) ht.get(row));
        
        if (ht.isEmpty()) {
            return this;
        } else if (ht.size() == 1) {
            return this;
        } else if ((Boolean) ht.get(row)) {
            return this;
        } else {
            return null;
        }
    }
}

---------------------------------------------------------------------------------------

I add the next line and rendered the progress column is follows:

   convertTableModel.addRow(new Vector());
   ((ProgressBarRenderer) convertTable.getCellRenderer(row, INDEX_CONVERT_STATUS)).setRowEnabled(row, false);

---------------------------------------------------------------------------------------

When I add the first row, it works fine, but when I add the second row, he painted the entire column.

Naturally, you will have problems if you set a string or a color of a table cell value when the class of the column is declared as integer. As I have already said, you need to spend some time with the tutorials.

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;

public class ProgressBarTableCellRendererExample {

  Random random = new Random();
  JTable table;

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

      public void run() {
        new ProgressBarTableCellRendererExample().makeUI();
      }
    });
  }

  public void makeUI() {
    table = new JTable(10, 1) {

      @Override
      public boolean isCellEditable(int row, int column) {
        return false;
      }
    };
    for (int i = 0; i < table.getRowCount(); i++) {
      table.setValueAt(0, i, 0);
    }
    table.getColumnModel().getColumn(0).
            setCellRenderer(new ProgressBarTableCellRenderer());

    JButton button = new JButton("Increment");
    button.addActionListener(new ActionListener() {

      public void actionPerformed(ActionEvent e) {
        increment();
      }
    });

    JFrame frame = new JFrame();
    frame.add(new JScrollPane(table), BorderLayout.CENTER);
    frame.add(button, BorderLayout.SOUTH);

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(400, 400);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
  }

  private void increment() {
    for (int i = 0; i < table.getRowCount(); i++) {
      Object value = table.getValueAt(i, 0);
      if (value instanceof Integer) {
        Integer oldValue = (Integer) table.getValueAt(i, 0);
        int newValue = Math.min(100, oldValue + random.nextInt(25));
        switch (newValue) {
          case 13: // and its multiples
          case 26:
          case 39:
          case 52:
          case 65:
          case 78:
          case 91:
            table.setValueAt("Failed", i, 0);
            break;
          case 100:
            table.setValueAt("Completed", i, 0);
            break;
          default:
            table.setValueAt(newValue, i, 0);
        }
      }
    }
  }

  private class ProgressBarTableCellRenderer
          extends JProgressBar implements TableCellRenderer {

    private TableCellRenderer stringRenderer =
            new DefaultTableCellRenderer();

    public Component getTableCellRendererComponent(JTable table,
            Object value, boolean isSelected, boolean hasFocus,
            int row, int column) {
      if (value instanceof Integer) {
        setValue((Integer) value);
        return this;
      } else {
        return stringRenderer.getTableCellRendererComponent(table,
                value, isSelected, hasFocus, row, column);
      }
    }
    // Override void validate(), invalidate(), revalidate(), repaint()
    // and all overloads of firePropertyChange(...) as no-ops
    // for efficiency
  }
}

Tags: Java

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