tableselectiondemo.java

java tutorial.sun公司官方出品。java入门书籍。最新版

/*
 * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Sun Microsystems nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * 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,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */ 

package components;

/*
 * TableSelectionDemo.java requires no other files.
 */

import javax.swing.*;
import javax.swing.table.AbstractTableModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.GridLayout;
import java.awt.Dimension;

public class TableSelectionDemo extends JPanel 
                                implements ActionListener { 
    private JTable table;
    private JCheckBox rowCheck;
    private JCheckBox columnCheck;
    private JCheckBox cellCheck;
    private ButtonGroup buttonGroup;
    private JTextArea output;

    public TableSelectionDemo() {
        super();
        setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));

        table = new JTable(new MyTableModel());
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));
        table.setFillsViewportHeight(true);
        table.getSelectionModel().addListSelectionListener(new RowListener());
        table.getColumnModel().getSelectionModel().
            addListSelectionListener(new ColumnListener());
        add(new JScrollPane(table));

        add(new JLabel("Selection Mode"));
        buttonGroup = new ButtonGroup();
        addRadio("Multiple Interval Selection").setSelected(true);
        addRadio("Single Selection");
        addRadio("Single Interval Selection");

        add(new JLabel("Selection Options"));
        rowCheck = addCheckBox("Row Selection");
        rowCheck.setSelected(true);
        columnCheck = addCheckBox("Column Selection");
        cellCheck = addCheckBox("Cell Selection");
        cellCheck.setEnabled(false);

        output = new JTextArea(5, 40);
        output.setEditable(false);
        add(new JScrollPane(output));
    }

    private JCheckBox addCheckBox(String text) {
        JCheckBox checkBox = new JCheckBox(text);
        checkBox.addActionListener(this);
        add(checkBox);
        return checkBox;
    }

    private JRadioButton addRadio(String text) {
        JRadioButton b = new JRadioButton(text);
        b.addActionListener(this);
        buttonGroup.add(b);
        add(b);
        return b;
    }

    public void actionPerformed(ActionEvent event) {
        String command = event.getActionCommand();
        //Cell selection is disabled in Multiple Interval Selection
        //mode. The enabled state of cellCheck is a convenient flag
        //for this status.
        if ("Row Selection" == command) {
            table.setRowSelectionAllowed(rowCheck.isSelected());
            //In MIS mode, column selection allowed must be the
            //opposite of row selection allowed.
            if (!cellCheck.isEnabled()) {
                table.setColumnSelectionAllowed(!rowCheck.isSelected());
            }
        } else if ("Column Selection" == command) {
            table.setColumnSelectionAllowed(columnCheck.isSelected());
            //In MIS mode, row selection allowed must be the
            //opposite of column selection allowed.
            if (!cellCheck.isEnabled()) {
                table.setRowSelectionAllowed(!columnCheck.isSelected());
            }
        } else if ("Cell Selection" == command) {
            table.setCellSelectionEnabled(cellCheck.isSelected());
        } else if ("Multiple Interval Selection" == command) { 
            table.setSelectionMode(
                    ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
            //If cell selection is on, turn it off.
            if (cellCheck.isSelected()) {
                cellCheck.setSelected(false);
                table.setCellSelectionEnabled(false);
            }
            //And don't let it be turned back on.
            cellCheck.setEnabled(false);
        } else if ("Single Interval Selection" == command) {
            table.setSelectionMode(
                    ListSelectionModel.SINGLE_INTERVAL_SELECTION);
            //Cell selection is ok in this mode.
            cellCheck.setEnabled(true);
        } else if ("Single Selection" == command) {
            table.setSelectionMode(
                    ListSelectionModel.SINGLE_SELECTION);
            //Cell selection is ok in this mode.
            cellCheck.setEnabled(true);
        }

        //Update checkboxes to reflect selection mode side effects.
        rowCheck.setSelected(table.getRowSelectionAllowed());
        columnCheck.setSelected(table.getColumnSelectionAllowed());
        if (cellCheck.isEnabled()) {
            cellCheck.setSelected(table.getCellSelectionEnabled());
        }
    }

    private void outputSelection() {
        output.append(String.format("Lead: %d, %d. ",
                    table.getSelectionModel().getLeadSelectionIndex(),
                    table.getColumnModel().getSelectionModel().
                        getLeadSelectionIndex()));
        output.append("Rows:");
        for (int c : table.getSelectedRows()) {
            output.append(String.format(" %d", c));
        }
        output.append(". Columns:");
        for (int c : table.getSelectedColumns()) {
            output.append(String.format(" %d", c));
        }
        output.append(".\n");
    }

    private class RowListener implements ListSelectionListener {
        public void valueChanged(ListSelectionEvent event) {
            if (event.getValueIsAdjusting()) {
                return;
            }
            output.append("ROW SELECTION EVENT. ");
            outputSelection();
        }
    }

    private class ColumnListener implements ListSelectionListener {
        public void valueChanged(ListSelectionEvent event) {
            if (event.getValueIsAdjusting()) {
                return;
            }
            output.append("COLUMN SELECTION EVENT. ");
            outputSelection();
        }
    }

    class MyTableModel extends AbstractTableModel {
        private String[] columnNames = {"First Name",
                                        "Last Name",
                                        "Sport",
                                        "# of Years",
                                        "Vegetarian"};
        private Object[][] data = {
            {"Mary", "Campione",
             "Snowboarding", new Integer(5), new Boolean(false)},
            {"Alison", "Huml",
             "Rowing", new Integer(3), new Boolean(true)},
            {"Kathy", "Walrath",
             "Knitting", new Integer(2), new Boolean(false)},
            {"Sharon", "Zakhour",
             "Speed reading", new Integer(20), new Boolean(true)},
            {"Philip", "Milne",
             "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];
        }

        /*
         * 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 < 2) {
                return false;
            } else {
                return true;
            }
        }

        /*
         * Don't need to implement this method unless your table's
         * data can change.
         */
        public void setValueAt(Object value, int row, int col) {
            data[row][col] = value;
            fireTableCellUpdated(row, col);
        }

    }

    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Disable boldface controls.
        UIManager.put("swing.boldMetal", Boolean.FALSE); 

        //Create and set up the window.
        JFrame frame = new JFrame("TableSelectionDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Create and set up the content pane.
        TableSelectionDemo newContentPane = new TableSelectionDemo();
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}