147 lines
3.6 KiB
Java
147 lines
3.6 KiB
Java
//******************************************************************************
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//
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// File: DoubleTextField.java
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// Package: edu.rit.swing
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// Unit: Class edu.rit.swing.DoubleTextField
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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 javax.swing.JTextField;
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/**
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* Class DoubleTextField provides a JTextField for entering a double precision
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* floating point value. The DoubleTextField can be incorporated into a window
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* 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 DoubleTextField
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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 double text field with the given number of columns. The
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* value is initially 0.
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*
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* @param columns Number of columns.
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*/
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public DoubleTextField
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(int columns)
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{
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super (columns);
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value (0.0);
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}
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/**
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* Construct a new double text field with the given value and number of
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* columns.
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*
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* @param value Initial value.
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* @param columns Number of columns.
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*/
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public DoubleTextField
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(double value,
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int columns)
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{
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super (columns);
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value (value);
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}
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// Exported operations.
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/**
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* Determine if this double text field contains a syntactically valid double
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* precision floating point number in the given range. If it does, true is
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* returned. If it does not, a beep is sounded, the input focus is set to
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* this integer text field, all the text is selected, and false is returned.
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*
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* @param lb Lower bound.
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* @param ub Upper bound.
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*
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* @return True if this double text field contains a syntactically valid
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* double precision floating point number in the given range, false
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* otherwise.
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*/
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public boolean isOkay
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(double lb,
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double ub)
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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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double value = Double.parseDouble (getText());
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valid = (lb <= value && value <= ub);
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}
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catch (NumberFormatException 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 double text field's value. If this double text field does not
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* contain a syntactically valid double precision floating point number, 0
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* is returned.
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*
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* @return Value.
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*/
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public double value()
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{
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try
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{
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return Double.parseDouble (getText());
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}
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catch (NumberFormatException exc)
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{
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return 0.0;
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}
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}
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/**
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* Set this double text field's value.
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*
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* @param value Value.
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*/
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public void value
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(double value)
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{
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setText (""+value);
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}
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}
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