143 lines
3.6 KiB
Java
143 lines
3.6 KiB
Java
//******************************************************************************
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//
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// File: DecimalFormatTextField.java
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// Package: edu.rit.swing
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// Unit: Class edu.rit.swing.DecimalFormatTextField
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//
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// This Java source file is copyright (C) 2013 by Alan Kaminsky. All rights
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// reserved. For further information, contact the author, Alan Kaminsky, at
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// ark@cs.rit.edu.
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//
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// This Java source file is part of the Parallel Java 2 Library ("PJ2"). PJ2 is
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// free software; you can redistribute it and/or modify it under the terms of
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// the GNU General Public License as published by the Free Software Foundation;
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// either version 3 of the License, or (at your option) any later version.
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//
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// PJ2 is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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//
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// A copy of the GNU General Public License is provided in the file gpl.txt. You
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// may also obtain a copy of the GNU General Public License on the World Wide
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// Web at http://www.gnu.org/licenses/gpl.html.
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//
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//******************************************************************************
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package edu.rit.swing;
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import java.awt.Toolkit;
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import java.text.DecimalFormat;
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import javax.swing.JTextField;
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/**
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* Class DecimalFormatTextField provides a JTextField for entering a pattern
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* string for a DecimalFormat object. The DecimalFormatTextField can be
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* incorporated into a window or dialog.
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*
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* @author Alan Kaminsky
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* @version 07-Mar-2011
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*/
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public class DecimalFormatTextField
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extends JTextField
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{
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// Exported constructors.
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/**
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* Construct a new decimal format text field with the given number of
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* columns. The pattern is initially <TT>"0"</TT>.
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*
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* @param columns Number of columns.
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*/
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public DecimalFormatTextField
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(int columns)
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{
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super (columns);
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pattern (new DecimalFormat ("0"));
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}
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/**
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* Construct a new integer text field with the given pattern and number of
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* columns.
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*
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* @param pattern Initial pattern.
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* @param columns Number of columns.
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*/
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public DecimalFormatTextField
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(DecimalFormat pattern,
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int columns)
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{
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super (columns);
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pattern (pattern);
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}
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// Exported operations.
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/**
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* Determine if this decimal format text field contains a syntactically
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* valid pattern in the given range. If it does, true is returned. If it
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* does not, a beep is sounded, the input focus is set to this decimal
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* format text field, all the text is selected, and false is returned.
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*
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* @return True if this decimal format text field contains a syntactically
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* valid pattern, false otherwise.
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*/
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public boolean isOkay()
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{
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// Check validity.
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boolean valid = false;
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try
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{
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DecimalFormat pattern = new DecimalFormat (getText());
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valid = true;
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}
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catch (Throwable exc)
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{
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}
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// Take action if invalid.
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if (! valid)
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{
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requestFocusInWindow();
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setSelectionStart (0);
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setSelectionEnd (Integer.MAX_VALUE);
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Toolkit.getDefaultToolkit().beep();
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}
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return valid;
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}
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/**
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* Get this decimal format text field's pattern. If this decimal format text
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* field does not contain a syntactically valid pattern, null is returned.
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*
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* @return Pattern.
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*/
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public DecimalFormat pattern()
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{
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DecimalFormat pattern = null;
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try
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{
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pattern = new DecimalFormat (getText());
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}
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catch (Throwable exc)
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{
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}
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return pattern;
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}
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/**
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* Set this decimal format text field's pattern.
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*
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* @param pattern Pattern.
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*/
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public void pattern
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(DecimalFormat pattern)
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{
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setText (pattern.toPattern());
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}
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}
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