BoundedRangeModel.java

/* BoundedRangeModel.java --
   Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc.

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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);
}