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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* ident "%Z%%M% %I% %E% SMI"
*
* Copyright (c) 1999-2000 by Sun Microsystems, Inc.
* All rights reserved.
*/
import java.awt.TextField;
/**
* This class is a DCTextField that allows values to wrap around over
* a maximum and a minimum value.
*/
public class DCCircularTextField extends DCTextField {
private int maximum = 59;
private int minimum = 0;
/**
* Constructor for DCCircularTextField.
* @param text the text to initilize the text field with
* @param columns the width of the text field in number of columns
*/
public DCCircularTextField(String text, int columns) {
super(text, columns);
}
/**
* Sets the maximum allowable value for this field. If the current
* value is greater than this maximum value, then the current value is
* set to the maximum value.
* @param maxValue the maximum integer value for this text field.
*/
public void setMaximum(int maxValue) {
maximum = maxValue;
if (getValue() > maxValue)
super.setValue(maxValue);
}
/**
* Sets the minimum allowable value for this field. If the current
* value is less than this minimum value, then the current value is
* set to the minimum value.
* @param minValue the minimum integer value for this text field.
*/
public void setMinimum(int minValue) {
minimum = minValue;
if (getValue() < minValue)
super.setValue(minValue);
}
/**
* Increments the value of the textfield. It does a wrap around on
* the max value and min value.
* @param value how much to increment by. It can be negative if one
* desires to decrement.
*/
protected final void increment(int value) {
int current = getValue();
int next = (current + value);
/*
* Now wrap it around this way:
*/
/*
*
* (1) Translate coordinates by 'minimum' to get the minimum to 0
* eg. the legal range -1..5 to 0..6
* or 1..5 to 0..4
*/
int transMax = maximum - minimum;
int transValue = next - minimum;
/*
* (2) Now do circular math
*/
transValue %= (transMax + 1); // modulo max+1 since max is permissible
transValue = (transValue < 0)? (transValue + (transMax+1)) : transValue;
/*
* (3) Translate back to old coordinates
*/
next = transValue + minimum;
setValue(next);
}
/**
* Checks to see if the given value would be
* valid for this text
* field. The check looks to see if the value is less than the
* minimum value or greater than the maximum value.
* @param newValue
* @return true if it will be valid, false otherwise.
*/
public boolean checkValue(int value) {
if (value > maximum || value < minimum)
return false;
else
return true;
}
}
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