tabledialogeditdemo.java

这是一个英文版的《Java程序设计与问题解决》现在好多大学都当成教材

import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.DefaultCellEditor;
import javax.swing.table.TableCellRenderer;

import javax.swing.JLabel;
import javax.swing.JDialog;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JColorChooser;
import javax.swing.BorderFactory;
import javax.swing.border.Border;

import javax.swing.JScrollPane;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import java.awt.*;
import java.awt.event.*;

/**
 * This is like TableEditDemo, except that it substitutes a
 * Favorite Color column for the Last Name column and specifies
 * a custom cell renderer and editor for the color data.
 */
public class TableDialogEditDemo extends JFrame {
    private boolean DEBUG = false;

    public TableDialogEditDemo() {
        super("TableDialogEditDemo");

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

        //Create the scroll pane and add the table to it. 
        JScrollPane scrollPane = new JScrollPane(table);

        //Set up renderer and editor for the Favorite Color column.
        setUpColorRenderer(table);
        setUpColorEditor(table);

        //Set up real input validation for integer data.
        setUpIntegerEditor(table);

        //Add the scroll pane to this window.
        getContentPane().add(scrollPane, BorderLayout.CENTER);

        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }

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

        public ColorRenderer(boolean isBordered) {
            super();
            this.isBordered = isBordered;
            setOpaque(true); //MUST do this for background to show up.
        }

        public Component getTableCellRendererComponent(
                                JTable table, Object color, 
                                boolean isSelected, boolean hasFocus,
                                int row, int column) {
            setBackground((Color)color);
            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;
        }
    }

    private void setUpColorRenderer(JTable table) {
        table.setDefaultRenderer(Color.class,
                                 new ColorRenderer(true));
    }

    //Set up the editor for the Color cells.
    private void setUpColorEditor(JTable table) {
        //First, set up the button that brings up the dialog.
        final JButton button = new JButton("") {
            public void setText(String s) {
                //Button never shows text -- only color.
            }
        };
        button.setBackground(Color.white);
        button.setBorderPainted(false);
        button.setMargin(new Insets(0,0,0,0));

        //Now create an editor to encapsulate the button, and
        //set it up as the editor for all Color cells.
        final ColorEditor colorEditor = new ColorEditor(button);
        table.setDefaultEditor(Color.class, colorEditor);

        //Set up the dialog that the button brings up.
        final JColorChooser colorChooser = new JColorChooser();
        ActionListener okListener = new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                colorEditor.currentColor = colorChooser.getColor();
            }
        };
        final JDialog dialog = JColorChooser.createDialog(button,
                                        "Pick a Color",
                                        true,
                                        colorChooser,
                                        okListener,
                                        null); //XXXDoublecheck this is OK

        //Here's the code that brings up the dialog.
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                button.setBackground(colorEditor.currentColor);
                colorChooser.setColor(colorEditor.currentColor);
                //Without the following line, the dialog comes up
                //in the middle of the screen.
                //dialog.setLocationRelativeTo(button);
                dialog.show();
            }
        });
    }

    /*
     * The editor button that brings up the dialog.
     * We extend DefaultCellEditor for convenience,
     * even though it mean we have to create a dummy
     * check box.  Another approach would be to copy
     * the implementation of TableCellEditor methods
     * from the source code for DefaultCellEditor.
     */
    class ColorEditor extends DefaultCellEditor {
        Color currentColor = null;

        public ColorEditor(JButton b) {
                super(new JCheckBox()); //Unfortunately, the constructor
                                        //expects a check box, combo box,
                                        //or text field.
            editorComponent = b;
            setClickCountToStart(1); //This is usually 1 or 2.

            //Must do this so that editing stops when appropriate.
            b.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    fireEditingStopped();
                }
            });
        }

        protected void fireEditingStopped() {
            super.fireEditingStopped();
        }

        public Object getCellEditorValue() {
            return currentColor;
        }

        public Component getTableCellEditorComponent(JTable table, 
                                                     Object value,
                                                     boolean isSelected,
                                                     int row,
                                                     int column) {
            ((JButton)editorComponent).setText(value.toString());
            currentColor = (Color)value;
            return editorComponent;
        }
    }

    private void setUpIntegerEditor(JTable table) {
        //Set up the editor for the integer cells.
        final WholeNumberField integerField = new WholeNumberField(0, 5);
        integerField.setHorizontalAlignment(WholeNumberField.RIGHT);

        DefaultCellEditor integerEditor = 
            new DefaultCellEditor(integerField) {
                //Override DefaultCellEditor's getCellEditorValue method
                //to return an Integer, not a String:
                public Object getCellEditorValue() {
                    return new Integer(integerField.getValue());
                }
            };
        table.setDefaultEditor(Integer.class, integerEditor);
    }


    class MyTableModel extends AbstractTableModel {
        final String[] columnNames = {"First Name", 
                                      "Favorite Color",
                                      "Sport",
                                      "# of Years",
                                      "Vegetarian"};
        final 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),
             "Chasing toddlers", new Integer(2), new Boolean(false)},
            {"Mark", Color.blue,
             "Speed reading", new Integer(20), new Boolean(true)},
            {"Philip", Color.pink,
             "Pool", new Integer(7), 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];
        }

        /*
         * 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) {
            return getValueAt(0, c).getClass();
        }

        /*
         * Don't need to implement this method unless your table's
         * editable.
         */
        public boolean isCellEditable(int row, int col) {
            //Note that the data/cell address is constant,
            //no matter where the cell appears onscreen.
            if (col < 1) { 
                return false;
            } else {
                return true;
            }
        }

        public void setValueAt(Object value, int row, int col) {
            if (DEBUG) {
                System.out.println("Setting value at " + row + "," + col
                                   + " to " + value
                                   + " (an instance of " 
                                   + value.getClass() + ")");
            }

            data[row][col] = value;
            fireTableCellUpdated(row, col);

            if (DEBUG) {
                System.out.println("New value of data:");
                printDebugData();
            }
        }

        private void printDebugData() {
            int numRows = getRowCount();
            int numCols = getColumnCount();

            for (int i=0; i < numRows; i++) {
                System.out.print("    row " + i + ":");
                for (int j=0; j < numCols; j++) {
                    System.out.print("  " + data[i][j]);
                }
                System.out.println();
            }
            System.out.println("--------------------------");
        }
    }

    public static void main(String[] args) {
        TableDialogEditDemo frame = new TableDialogEditDemo();
        frame.pack();
        frame.setVisible(true);
    }
}