Java tutorial
/* * Copyright (c) 1995, 2008, Oracle and/or its affiliates. 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 Oracle or 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; /* * IntegerEditor is used by TableFTFEditDemo.java. */ import javax.swing.AbstractAction; import javax.swing.DefaultCellEditor; import javax.swing.JFormattedTextField; import javax.swing.JOptionPane; import javax.swing.JTable; import javax.swing.JTextField; import javax.swing.KeyStroke; import javax.swing.SwingUtilities; import java.awt.event.ActionEvent; import java.awt.event.KeyEvent; import java.awt.Component; import java.awt.Toolkit; import java.text.NumberFormat; import java.text.ParseException; import javax.swing.text.DefaultFormatterFactory; import javax.swing.text.NumberFormatter; /** * Implements a cell editor that uses a formatted text field * to edit Integer values. */ public class IntegerEditor extends DefaultCellEditor { JFormattedTextField ftf; NumberFormat integerFormat; private Integer minimum, maximum; private boolean DEBUG = false; public IntegerEditor(int min, int max) { super(new JFormattedTextField()); ftf = (JFormattedTextField) getComponent(); minimum = new Integer(min); maximum = new Integer(max); //Set up the editor for the integer cells. integerFormat = NumberFormat.getIntegerInstance(); NumberFormatter intFormatter = new NumberFormatter(integerFormat); intFormatter.setFormat(integerFormat); intFormatter.setMinimum(minimum); intFormatter.setMaximum(maximum); ftf.setFormatterFactory(new DefaultFormatterFactory(intFormatter)); ftf.setValue(minimum); ftf.setHorizontalAlignment(JTextField.TRAILING); ftf.setFocusLostBehavior(JFormattedTextField.PERSIST); //React when the user presses Enter while the editor is //active. (Tab is handled as specified by //JFormattedTextField's focusLostBehavior property.) ftf.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0), "check"); ftf.getActionMap().put("check", new AbstractAction() { public void actionPerformed(ActionEvent e) { if (!ftf.isEditValid()) { //The text is invalid. if (userSaysRevert()) { //reverted ftf.postActionEvent(); //inform the editor } } else try { //The text is valid, ftf.commitEdit(); //so use it. ftf.postActionEvent(); //stop editing } catch (java.text.ParseException exc) { } } }); } //Override to invoke setValue on the formatted text field. public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column) { JFormattedTextField ftf = (JFormattedTextField) super.getTableCellEditorComponent(table, value, isSelected, row, column); ftf.setValue(value); return ftf; } //Override to ensure that the value remains an Integer. public Object getCellEditorValue() { JFormattedTextField ftf = (JFormattedTextField) getComponent(); Object o = ftf.getValue(); if (o instanceof Integer) { return o; } else if (o instanceof Number) { return new Integer(((Number) o).intValue()); } else { if (DEBUG) { System.out.println("getCellEditorValue: o isn't a Number"); } try { return integerFormat.parseObject(o.toString()); } catch (ParseException exc) { System.err.println("getCellEditorValue: can't parse o: " + o); return null; } } } //Override to check whether the edit is valid, //setting the value if it is and complaining if //it isn't. If it's OK for the editor to go //away, we need to invoke the superclass's version //of this method so that everything gets cleaned up. public boolean stopCellEditing() { JFormattedTextField ftf = (JFormattedTextField) getComponent(); if (ftf.isEditValid()) { try { ftf.commitEdit(); } catch (java.text.ParseException exc) { } } else { //text is invalid if (!userSaysRevert()) { //user wants to edit return false; //don't let the editor go away } } return super.stopCellEditing(); } /** * Lets the user know that the text they entered is * bad. Returns true if the user elects to revert to * the last good value. Otherwise, returns false, * indicating that the user wants to continue editing. */ protected boolean userSaysRevert() { Toolkit.getDefaultToolkit().beep(); ftf.selectAll(); Object[] options = { "Edit", "Revert" }; int answer = JOptionPane.showOptionDialog(SwingUtilities.getWindowAncestor(ftf), "The value must be an integer between " + minimum + " and " + maximum + ".\n" + "You can either continue editing " + "or revert to the last valid value.", "Invalid Text Entered", JOptionPane.YES_NO_OPTION, JOptionPane.ERROR_MESSAGE, null, options, options[1]); if (answer == 1) { //Revert! ftf.setValue(ftf.getValue()); return true; } return false; } }