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//******************************************************************************
//
// File: DecimalFormatTextField.java
// Package: edu.rit.swing
// Unit: Class edu.rit.swing.DecimalFormatTextField
//
// This Java source file is copyright (C) 2011 by Alan Kaminsky. All rights
// reserved. For further information, contact the author, Alan Kaminsky, at
// ark@cs.rit.edu.
//
// This Java source file is part of the Parallel Java Library ("PJ"). PJ is free
// software; you can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// PJ is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
//
// Linking this library statically or dynamically with other modules is making a
// combined work based on this library. Thus, the terms and conditions of the
// GNU General Public License cover the whole combination.
//
// As a special exception, the copyright holders of this library give you
// permission to link this library with independent modules to produce an
// executable, regardless of the license terms of these independent modules, and
// to copy and distribute the resulting executable under terms of your choice,
// provided that you also meet, for each linked independent module, the terms
// and conditions of the license of that module. An independent module is a
// module which is not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the library, but
// you are not obligated to do so. If you do not wish to do so, delete this
// exception statement from your version.
//
// A copy of the GNU General Public License is provided in the file gpl.txt. You
// may also obtain a copy of the GNU General Public License on the World Wide
// Web at http://www.gnu.org/licenses/gpl.html.
//
//******************************************************************************
package edu.rit.swing;
import java.awt.Toolkit;
import java.text.DecimalFormat;
import javax.swing.JTextField;
/**
* Class DecimalFormatTextField provides a JTextField for entering a pattern
* string for a DecimalFormat object. The DecimalFormatTextField can be
* incorporated into a window or dialog.
*
* @author Alan Kaminsky
* @version 07-Mar-2011
*/
public class DecimalFormatTextField
extends JTextField
{
// Exported constructors.
/**
* Construct a new decimal format text field with the given number of
* columns. The pattern is initially <TT>"0"</TT>.
*
* @param columns Number of columns.
*/
public DecimalFormatTextField
(int columns)
{
super (columns);
pattern (new DecimalFormat ("0"));
}
/**
* Construct a new integer text field with the given pattern and number of
* columns.
*
* @param pattern Initial pattern.
* @param columns Number of columns.
*/
public DecimalFormatTextField
(DecimalFormat pattern,
int columns)
{
super (columns);
pattern (pattern);
}
// Exported operations.
/**
* Determine if this decimal format text field contains a syntactically
* valid pattern in the given range. If it does, true is returned. If it
* does not, a beep is sounded, the input focus is set to this decimal
* format text field, all the text is selected, and false is returned.
*
* @return True if this decimal format text field contains a syntactically
* valid pattern, false otherwise.
*/
public boolean isOkay()
{
// Check validity.
boolean valid = false;
try
{
DecimalFormat pattern = new DecimalFormat (getText());
valid = true;
}
catch (Throwable exc)
{
}
// Take action if invalid.
if (! valid)
{
requestFocusInWindow();
setSelectionStart (0);
setSelectionEnd (Integer.MAX_VALUE);
Toolkit.getDefaultToolkit().beep();
}
return valid;
}
/**
* Get this decimal format text field's pattern. If this decimal format text
* field does not contain a syntactically valid pattern, null is returned.
*
* @return Pattern.
*/
public DecimalFormat pattern()
{
DecimalFormat pattern = null;
try
{
pattern = new DecimalFormat (getText());
}
catch (Throwable exc)
{
}
return pattern;
}
/**
* Set this decimal format text field's pattern.
*
* @param pattern Pattern.
*/
public void pattern
(DecimalFormat pattern)
{
setText (pattern.toPattern());
}
}
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