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/* BoundedRangeModel.java --

   Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

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02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

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As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

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package javax.swing;

import javax.swing.event.ChangeEvent;

import javax.swing.event.ChangeListener;

/**

 * The data model that represents a <i>range</i> that is constrained to fit

 * within specified <i>bounds</i>.  The range is defined as <code>value</code>

 * to <code>value + extent</code>, where both <code>value</code> and

 * <code>extent</code> are integers, and <code>extent >= 0</code>.   The bounds

 * are defined by integers <code>minimum</code> and <code>maximum</code>.

 * <p>

 * This type of model is used in components that display a range of values,

 * like {@link JProgressBar} and {@link JSlider}.

 *

 * @author Andrew Selkirk

 */

public interface BoundedRangeModel

{

  /**

   * Returns the current value for the model.

   *

   * @return The current value for the model.

   *

   * @see #setValue(int)

   */

  int getValue();

  /**

   * Sets the value for the model and sends a {@link ChangeEvent} to

   * all registered listeners.  The new value must satisfy the constraint

   * <code>min <= value <= value + extent <= max</code>.

   *

   * @param value the value

   *

   * @see #getValue()

   */

  void setValue(int value);

  /**

   * Returns the lower bound for the model.  The start of the model's range

   * (see {@link #getValue()}) cannot be less than this lower bound.

   *

   * @return The lower bound for the model.

   *

   * @see #setMinimum(int)

   * @see #getMaximum()

   */

  int getMinimum();

  /**

   * Sets the lower bound for the model and sends a {@link ChangeEvent} to all

   * registered listeners.  The new minimum must be less than or equal to the

   * start value of the model's range (as returned by {@link #getValue()}).

   *

   * @param minimum the minimum value

   *

   * @see #getMinimum()

   */

  void setMinimum(int minimum);

  /**

   * Returns the upper bound for the model.  This sets an upper limit for the

   * end value of the model's range ({@link #getValue()} +

   * {@link #getExtent()}).

   *

   * @return The upper bound for the model.

   *

   * @see #setMaximum(int)

   * @see #getMinimum()

   */

  int getMaximum();

  /**

   * Sets the upper bound for the model and sends a {@link ChangeEvent} to all

   * registered listeners.  The new maximum must be greater than or equal to the

   * end value of the model's range (as returned by {@link #getValue()} +

   * {@link #getExtent()}).

   *

   * @param maximum the maximum value

   *

   * @see #getMaximum()

   */

  void setMaximum(int maximum);

  /**

   * Returns the value of the <code>valueIsAdjusting</code> property.

   *

   * @return <code>true</code> if value is adjusting,

   * otherwise <code>false</code>

   *

   * @see #setValueIsAdjusting(boolean)

   */

  boolean getValueIsAdjusting();

  /**

   * Sets the <code>valueIsAdjusting</code> property.

   *

   * @param adjusting <code>true</code> if adjusting,

   * <code>false</code> otherwise

   *

   * @see #getValueIsAdjusting()

   */

  void setValueIsAdjusting(boolean adjusting);

  /**

   * Returns the current extent.

   *

   * @return the extent

   *

   * @see #setExtent(int)

   */

  int getExtent();

  /**

   * Sets the extent, which is the length of the model's range, and sends a

   * {@link ChangeEvent} to all registered listeners.

   *

   * @param extent the extent

   *

   * @see #getExtent()

   */

  void setExtent(int extent);

  /**

   * Sets all the properties for the model in a single call.

   *

   * @param value the value

   * @param extent the extent

   * @param minimum the minimum value

   * @param maximum the maximum value

   * @param adjusting a flag that indicates the model is being adjusted

   *                  continuously.

   */

  void setRangeProperties(int value, int extent, int minimum, int maximum,

                          boolean adjusting);

  /**

   * Adds a <code>ChangeListener</code> to this object.

   *

   * @param listener the listener to add

   *

   * @see #removeChangeListener(ChangeListener)

   */

  void addChangeListener(ChangeListener listener);

  /**

   * Removes a <code>ChangeListener</code> from this object.

   *

   * @param listener the listener to remove

   *

   * @see #addChangeListener(ChangeListener)

   */

  void removeChangeListener(ChangeListener listener);

}