001 /* BoundedRangeModel.java --
002 Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
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009 any later version.
010
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013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
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019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
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036 exception statement from your version. */
037
038
039 package javax.swing;
040
041 import javax.swing.event.ChangeEvent;
042 import javax.swing.event.ChangeListener;
043
044 /**
045 * The data model that represents a <i>range</i> that is constrained to fit
046 * within specified <i>bounds</i>. The range is defined as <code>value</code>
047 * to <code>value + extent</code>, where both <code>value</code> and
048 * <code>extent</code> are integers, and <code>extent >= 0</code>. The bounds
049 * are defined by integers <code>minimum</code> and <code>maximum</code>.
050 * <p>
051 * This type of model is used in components that display a range of values,
052 * like {@link JProgressBar} and {@link JSlider}.
053 *
054 * @author Andrew Selkirk
055 */
056 public interface BoundedRangeModel
057 {
058 /**
059 * Returns the current value for the model.
060 *
061 * @return The current value for the model.
062 *
063 * @see #setValue(int)
064 */
065 int getValue();
066
067 /**
068 * Sets the value for the model and sends a {@link ChangeEvent} to
069 * all registered listeners. The new value must satisfy the constraint
070 * <code>min <= value <= value + extent <= max</code>.
071 *
072 * @param value the value
073 *
074 * @see #getValue()
075 */
076 void setValue(int value);
077
078 /**
079 * Returns the lower bound for the model. The start of the model's range
080 * (see {@link #getValue()}) cannot be less than this lower bound.
081 *
082 * @return The lower bound for the model.
083 *
084 * @see #setMinimum(int)
085 * @see #getMaximum()
086 */
087 int getMinimum();
088
089 /**
090 * Sets the lower bound for the model and sends a {@link ChangeEvent} to all
091 * registered listeners. The new minimum must be less than or equal to the
092 * start value of the model's range (as returned by {@link #getValue()}).
093 *
094 * @param minimum the minimum value
095 *
096 * @see #getMinimum()
097 */
098 void setMinimum(int minimum);
099
100 /**
101 * Returns the upper bound for the model. This sets an upper limit for the
102 * end value of the model's range ({@link #getValue()} +
103 * {@link #getExtent()}).
104 *
105 * @return The upper bound for the model.
106 *
107 * @see #setMaximum(int)
108 * @see #getMinimum()
109 */
110 int getMaximum();
111
112 /**
113 * Sets the upper bound for the model and sends a {@link ChangeEvent} to all
114 * registered listeners. The new maximum must be greater than or equal to the
115 * end value of the model's range (as returned by {@link #getValue()} +
116 * {@link #getExtent()}).
117 *
118 * @param maximum the maximum value
119 *
120 * @see #getMaximum()
121 */
122 void setMaximum(int maximum);
123
124 /**
125 * Returns the value of the <code>valueIsAdjusting</code> property.
126 *
127 * @return <code>true</code> if value is adjusting,
128 * otherwise <code>false</code>
129 *
130 * @see #setValueIsAdjusting(boolean)
131 */
132 boolean getValueIsAdjusting();
133
134 /**
135 * Sets the <code>valueIsAdjusting</code> property.
136 *
137 * @param adjusting <code>true</code> if adjusting,
138 * <code>false</code> otherwise
139 *
140 * @see #getValueIsAdjusting()
141 */
142 void setValueIsAdjusting(boolean adjusting);
143
144 /**
145 * Returns the current extent.
146 *
147 * @return the extent
148 *
149 * @see #setExtent(int)
150 */
151 int getExtent();
152
153 /**
154 * Sets the extent, which is the length of the model's range, and sends a
155 * {@link ChangeEvent} to all registered listeners.
156 *
157 * @param extent the extent
158 *
159 * @see #getExtent()
160 */
161 void setExtent(int extent);
162
163 /**
164 * Sets all the properties for the model in a single call.
165 *
166 * @param value the value
167 * @param extent the extent
168 * @param minimum the minimum value
169 * @param maximum the maximum value
170 * @param adjusting a flag that indicates the model is being adjusted
171 * continuously.
172 */
173 void setRangeProperties(int value, int extent, int minimum, int maximum,
174 boolean adjusting);
175
176 /**
177 * Adds a <code>ChangeListener</code> to this object.
178 *
179 * @param listener the listener to add
180 *
181 * @see #removeChangeListener(ChangeListener)
182 */
183 void addChangeListener(ChangeListener listener);
184
185 /**
186 * Removes a <code>ChangeListener</code> from this object.
187 *
188 * @param listener the listener to remove
189 *
190 * @see #addChangeListener(ChangeListener)
191 */
192 void removeChangeListener(ChangeListener listener);
193 }