Editor-in-Chief of cell customized JTable loss of focus

It is a follow-up of Re: tutorial on the AWT/Swing control flow in which I ask for pointers to help me understand the source of behavior lost focus in the custom my JTable cell editor.

I've done some research more and it turns out that loss of focus is a more general problem with the custom cell editors who call other windows. Even the demo of the pipette in the JTable tutorial at http://download.oracle.com/javase/tutorial/uiswing/examples/components/index.html#TableDialogEditDemo has this problem, IF you add a text field or both to the setting in FRONT of the table. Only in the demo table loses focus when the color picker appears, it is because the table is the only thing in the window!

Here's the code for demo, increased with two text fields, which are certainly bad here, but which serve the desired purpose:

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 *     notice, this list of conditions and the following disclaimer.
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 *     notice, this list of conditions and the following disclaimer in the
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 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
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 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableCellEditor;
import javax.swing.table.TableCellRenderer;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class TableDialogEditDemo extends JPanel {
    public class ColorEditor extends AbstractCellEditor
            implements TableCellEditor,
            ActionListener {
        Color currentColor;
        JButton button;
        JColorChooser colorChooser;
        JDialog dialog;
        protected static final String EDIT = "edit";

        public ColorEditor() {
            //Set up the editor (from the table's point of view), which is a button.
            //This button brings up the color chooser dialog, which is the editor from the user's point of view.
            button = new JButton();
            button.setActionCommand(EDIT);
            button.addActionListener(this);
            button.setBorderPainted(false);

            //Set up the dialog that the button brings up.
            colorChooser = new JColorChooser();
            dialog = JColorChooser.createDialog(button, "Pick a Color", true,  //modal
                    colorChooser, this,  //OK button handler
                    null); //no CANCEL button handler
        }

        /**
         * Handles events from the editor button and from the dialog's OK button.
         */
        public void actionPerformed(ActionEvent e) {
            if (EDIT.equals(e.getActionCommand())) {
                //The user has clicked the cell, so bring up the dialog.
                button.setBackground(currentColor);
                colorChooser.setColor(currentColor);
                dialog.setVisible(true);

                //Make the renderer reappear.
                fireEditingStopped();

            } else { //User pressed dialog's "OK" button
                currentColor = colorChooser.getColor();
            }
        }

        public Object getCellEditorValue() {
            return currentColor;
        }

        public Component getTableCellEditorComponent(JTable table,
                                                     Object value,
                                                     boolean isSelected,
                                                     int row,
                                                     int column) {
            currentColor = (Color) value;
            return button;
        }
    }

    public class ColorRenderer extends JLabel
            implements TableCellRenderer {
        Border unselectedBorder = null;
        Border selectedBorder = null;
        boolean isBordered = true;

        public ColorRenderer(boolean isBordered) {
            this.isBordered = isBordered;
            setOpaque(true);
        }

        public Component getTableCellRendererComponent(
                JTable table, Object color,
                boolean isSelected, boolean hasFocus,
                int row, int column) {
            Color newColor = (Color) color;
            setBackground(newColor);
            if (isBordered) {
                if (isSelected) {
                    if (selectedBorder == null) {
                        selectedBorder = BorderFactory.createMatteBorder(2, 5, 2, 5,
                                table.getSelectionBackground());
                    }
                    setBorder(selectedBorder);
                } else {
                    if (unselectedBorder == null) {
                        unselectedBorder = BorderFactory.createMatteBorder(2, 5, 2, 5,
                                table.getBackground());
                    }
                    setBorder(unselectedBorder);
                }
            }
            return this;
        }
    }

    public TableDialogEditDemo() {
        super(new GridLayout());

        JTextField tf1 = new JTextField("tf1");
        add(tf1);
        JTextField tf2 = new JTextField("tf2");
        add(tf2);

        JTable table = new JTable(new MyTableModel());
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));
        table.setFillsViewportHeight(true);

        JScrollPane scrollPane = new JScrollPane(table);

        table.setDefaultRenderer(Color.class,
                new ColorRenderer(true));
        table.setDefaultEditor(Color.class,
                new ColorEditor());

        add(scrollPane);
    }

    class MyTableModel extends AbstractTableModel {
        private String[] columnNames = {"First Name",
                "Favorite Color",
                "Sport",
                "# of Years",
                "Vegetarian"};
        private Object[][] data = {
                {"Mary", new Color(153, 0, 153),
                        "Snowboarding", new Integer(5), new Boolean(false)},
                {"Alison", new Color(51, 51, 153),
                        "Rowing", new Integer(3), new Boolean(true)},
                {"Kathy", new Color(51, 102, 51),
                        "Knitting", new Integer(2), new Boolean(false)},
                {"Sharon", Color.red,
                        "Speed reading", new Integer(20), new Boolean(true)},
                {"Philip", Color.pink,
                        "Pool", new Integer(10), new Boolean(false)}
        };

        public int getColumnCount() {
            return columnNames.length;
        }

        public int getRowCount() {
            return data.length;
        }

        public String getColumnName(int col) {
            return columnNames[col];
        }

        public Object getValueAt(int row, int col) {
            return data[row][col];
        }

        public Class getColumnClass(int c) {
            return getValueAt(0, c).getClass();
        }

        public boolean isCellEditable(int row, int col) {
            if (col < 1) {
                return false;
            } else {
                return true;
            }
        }

        public void setValueAt(Object value, int row, int col) {
            data[row][col] = value;
            fireTableCellUpdated(row, col);
        }
    }

    private static void createAndShowGUI() {
        JFrame frame = new JFrame("TableDialogEditDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JComponent newContentPane = new TableDialogEditDemo();
        newContentPane.setOpaque(true);
        frame.setContentPane(newContentPane);

        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}

When you come back to choose a color, tf1 is given to the development, instead of the table. This is because bringing the color selector window to front raises an event lost the focus to the cell editor component; It's temporary, as it should, then, why the hell is the system to lose track of who has the focus in the window?

I see the following in #getMostRecentFocusOwner () Window:

  public Component getMostRecentFocusOwner()
  {
    if (isFocused())
    {
      return getFocusOwner();
    }
    else
    {
      Component mostRecent =
        KeyboardFocusManager.getMostRecentFocusOwner(this);
      if (mostRecent != null)
      {
        return mostRecent;
      }
      else
      {
        return (isFocusableWindow())
               ? getFocusTraversalPolicy().getInitialComponent(this)
               : null;
      }
    }
  }

My app has a custom course development policy, so I am able to see who is called, and indeed, getInitialComponent() is called. Clearly, the KeyboardFocusManager is in fact to lose track of the fact that the table was concentrated to the point where the control was transferred to the color picker! I think that is quite unreasonable, especially since, as mentioned, it is a temporary , not a permanent LostFocus event.

I would be grateful for any wisdom to solve this, since a behavior similar to this little demo - without loss of focus, of course - is an essential part of my application.

Hello
Or simpler, setFocusable (false)

 public ColorEditor() {
   button = new JButton();
   button.setActionCommand(EDIT);
   button.addActionListener(this);
   button.setBorderPainted(false);
   button.setFocusable(false); //<---- add

Tags: Java

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