1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
//******************************************************************************
//
// File: DoubleTextField.java
// Package: edu.rit.swing
// Unit: Class edu.rit.swing.DoubleTextField
//
// 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 javax.swing.JTextField;
/**
* Class DoubleTextField provides a JTextField for entering a double precision
* floating point value. The DoubleTextField can be incorporated into a window
* or dialog.
*
* @author Alan Kaminsky
* @version 07-Mar-2011
*/
public class DoubleTextField
extends JTextField
{
// Exported constructors.
/**
* Construct a new double text field with the given number of columns. The
* value is initially 0.
*
* @param columns Number of columns.
*/
public DoubleTextField
(int columns)
{
super (columns);
value (0.0);
}
/**
* Construct a new double text field with the given value and number of
* columns.
*
* @param value Initial value.
* @param columns Number of columns.
*/
public DoubleTextField
(double value,
int columns)
{
super (columns);
value (value);
}
// Exported operations.
/**
* Determine if this double text field contains a syntactically valid double
* precision floating point number 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 integer text field, all the text is selected, and false is returned.
*
* @param lb Lower bound.
* @param ub Upper bound.
*
* @return True if this double text field contains a syntactically valid
* double precision floating point number in the given range, false
* otherwise.
*/
public boolean isOkay
(double lb,
double ub)
{
// Check validity.
boolean valid = false;
try
{
double value = Double.parseDouble (getText());
valid = (lb <= value && value <= ub);
}
catch (NumberFormatException exc)
{
}
// Take action if invalid.
if (! valid)
{
requestFocusInWindow();
setSelectionStart (0);
setSelectionEnd (Integer.MAX_VALUE);
Toolkit.getDefaultToolkit().beep();
}
return valid;
}
/**
* Get this double text field's value. If this double text field does not
* contain a syntactically valid double precision floating point number, 0
* is returned.
*
* @return Value.
*/
public double value()
{
try
{
return Double.parseDouble (getText());
}
catch (NumberFormatException exc)
{
return 0.0;
}
}
/**
* Set this double text field's value.
*
* @param value Value.
*/
public void value
(double value)
{
setText (""+value);
}
}
|
