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package javax.swing;

import javax.swing.event.*;



Defines the data model used by components like Sliders
and ProgressBars.
Defines four interrelated integer properties: minimum, maximum, extent
and value.  These four integers define two nested ranges like this:

minimum <= value <= value+extent <= maximum


The outer range is minimum,maximum and the inner
range is value,value+extent.  The inner range
must lie within the outer one, i.e. value must be
less than or equal to maximum and value+extent
must greater than or equal to minimum, and maximum
must be greater than or equal to minimum.
There are a few features of this model that one might find a little
surprising.  These quirks exist for the convenience of the
Swing BoundedRangeModel clients, such as Slider and
ScrollBar.

    

  • 
  The minimum and maximum set methods "correct" the other
  three properties to accommodate their new value argument.  For
  example setting the model's minimum may change its maximum, value,
  and extent properties (in that order), to maintain the constraints
  specified above.

  • 
  The value and extent set methods "correct" their argument to
  fit within the limits defined by the other three properties.
  For example if value == maximum, setExtent(10)
  would change the extent (back) to zero.

  • 
  The four BoundedRangeModel values are defined as Java Beans properties
  however Swing ChangeEvents are used to notify clients of changes rather
  than PropertyChangeEvents. This was done to keep the overhead of monitoring
  a BoundedRangeModel low. Changes are often reported at MouseDragged rates.




For an example of specifying custom bounded range models used by sliders,
see Separable model architecture
in A Swing Architecture Overview.

Author:Hans Muller
See Also:
/**
 * Defines the data model used by components like <code>Slider</code>s
 * and <code>ProgressBar</code>s.
 * Defines four interrelated integer properties: minimum, maximum, extent
 * and value.  These four integers define two nested ranges like this:
 * <pre>
 * minimum &lt;= value &lt;= value+extent &lt;= maximum
 * </pre>
 * The outer range is <code>minimum,maximum</code> and the inner
 * range is <code>value,value+extent</code>.  The inner range
 * must lie within the outer one, i.e. <code>value</code> must be
 * less than or equal to <code>maximum</code> and <code>value+extent</code>
 * must greater than or equal to <code>minimum</code>, and <code>maximum</code>
 * must be greater than or equal to <code>minimum</code>.
 * There are a few features of this model that one might find a little
 * surprising.  These quirks exist for the convenience of the
 * Swing BoundedRangeModel clients, such as <code>Slider</code> and
 * <code>ScrollBar</code>.
 * <ul>
 * <li>
 *   The minimum and maximum set methods "correct" the other
 *   three properties to accommodate their new value argument.  For
 *   example setting the model's minimum may change its maximum, value,
 *   and extent properties (in that order), to maintain the constraints
 *   specified above.
 *
 * <li>
 *   The value and extent set methods "correct" their argument to
 *   fit within the limits defined by the other three properties.
 *   For example if <code>value == maximum</code>, <code>setExtent(10)</code>
 *   would change the extent (back) to zero.
 *
 * <li>
 *   The four BoundedRangeModel values are defined as Java Beans properties
 *   however Swing ChangeEvents are used to notify clients of changes rather
 *   than PropertyChangeEvents. This was done to keep the overhead of monitoring
 *   a BoundedRangeModel low. Changes are often reported at MouseDragged rates.
 * </ul>
 *
 * <p>
 *
 * For an example of specifying custom bounded range models used by sliders,
 * see <a
 href="http://www.oracle.com/technetwork/java/architecture-142923.html#separable">Separable model architecture</a>
 * in <em>A Swing Architecture Overview.</em>
 *
 * @author Hans Muller
 * @see DefaultBoundedRangeModel
 */
public interface BoundedRangeModel
{
    
Returns the minimum acceptable value.

See Also:
Returns:the value of the minimum property
/**
     * Returns the minimum acceptable value.
     *
     * @return the value of the minimum property
     * @see #setMinimum
     */
    int getMinimum();


    
Sets the model's minimum to newMinimum.   The
other three properties may be changed as well, to ensure
that:

minimum <= value <= value+extent <= maximum




Notifies any listeners if the model changes.

Params:
  • newMinimum – the model's new minimum
See Also:
/**
     * Sets the model's minimum to <I>newMinimum</I>.   The
     * other three properties may be changed as well, to ensure
     * that:
     * <pre>
     * minimum &lt;= value &lt;= value+extent &lt;= maximum
     * </pre>
     * <p>
     * Notifies any listeners if the model changes.
     *
     * @param newMinimum the model's new minimum
     * @see #getMinimum
     * @see #addChangeListener
     */
    void setMinimum(int newMinimum);


    
Returns the model's maximum.  Note that the upper
limit on the model's value is (maximum - extent).

See Also:
Returns:the value of the maximum property.
/**
     * Returns the model's maximum.  Note that the upper
     * limit on the model's value is (maximum - extent).
     *
     * @return the value of the maximum property.
     * @see #setMaximum
     * @see #setExtent
     */
    int getMaximum();


    
Sets the model's maximum to newMaximum. The other
three properties may be changed as well, to ensure that

minimum <= value <= value+extent <= maximum




Notifies any listeners if the model changes.

Params:
  • newMaximum – the model's new maximum
See Also:
/**
     * Sets the model's maximum to <I>newMaximum</I>. The other
     * three properties may be changed as well, to ensure that
     * <pre>
     * minimum &lt;= value &lt;= value+extent &lt;= maximum
     * </pre>
     * <p>
     * Notifies any listeners if the model changes.
     *
     * @param newMaximum the model's new maximum
     * @see #getMaximum
     * @see #addChangeListener
     */
    void setMaximum(int newMaximum);


    
Returns the model's current value.  Note that the upper
limit on the model's value is maximum - extent
and the lower limit is minimum.

See Also:
Returns: the model's value
/**
     * Returns the model's current value.  Note that the upper
     * limit on the model's value is <code>maximum - extent</code>
     * and the lower limit is <code>minimum</code>.
     *
     * @return  the model's value
     * @see     #setValue
     */
    int getValue();


    
Sets the model's current value to newValue if newValue
satisfies the model's constraints. Those constraints are:

minimum <= value <= value+extent <= maximum


Otherwise, if newValue is less than minimum
it's set to minimum, if its greater than
maximum then it's set to maximum, and
if it's greater than value+extent then it's set to
value+extent.


When a BoundedRange model is used with a scrollbar the value
specifies the origin of the scrollbar knob (aka the "thumb" or
"elevator").  The value usually represents the origin of the
visible part of the object being scrolled.


Notifies any listeners if the model changes.

Params:
  • newValue – the model's new value
See Also:
/**
     * Sets the model's current value to <code>newValue</code> if <code>newValue</code>
     * satisfies the model's constraints. Those constraints are:
     * <pre>
     * minimum &lt;= value &lt;= value+extent &lt;= maximum
     * </pre>
     * Otherwise, if <code>newValue</code> is less than <code>minimum</code>
     * it's set to <code>minimum</code>, if its greater than
     * <code>maximum</code> then it's set to <code>maximum</code>, and
     * if it's greater than <code>value+extent</code> then it's set to
     * <code>value+extent</code>.
     * <p>
     * When a BoundedRange model is used with a scrollbar the value
     * specifies the origin of the scrollbar knob (aka the "thumb" or
     * "elevator").  The value usually represents the origin of the
     * visible part of the object being scrolled.
     * <p>
     * Notifies any listeners if the model changes.
     *
     * @param newValue the model's new value
     * @see #getValue
     */
    void setValue(int newValue);


    
This attribute indicates that any upcoming changes to the value
of the model should be considered a single event. This attribute
will be set to true at the start of a series of changes to the value,
and will be set to false when the value has finished changing.  Normally
this allows a listener to only take action when the final value change in
committed, instead of having to do updates for all intermediate values.


Sliders and scrollbars use this property when a drag is underway.

Params:
  • b – true if the upcoming changes to the value property are part of a series
/**
     * This attribute indicates that any upcoming changes to the value
     * of the model should be considered a single event. This attribute
     * will be set to true at the start of a series of changes to the value,
     * and will be set to false when the value has finished changing.  Normally
     * this allows a listener to only take action when the final value change in
     * committed, instead of having to do updates for all intermediate values.
     * <p>
     * Sliders and scrollbars use this property when a drag is underway.
     *
     * @param b true if the upcoming changes to the value property are part of a series
     */
    void setValueIsAdjusting(boolean b);


    
Returns true if the current changes to the value property are part
of a series of changes.

See Also:
Returns:the valueIsAdjustingProperty.
/**
     * Returns true if the current changes to the value property are part
     * of a series of changes.
     *
     * @return the valueIsAdjustingProperty.
     * @see #setValueIsAdjusting
     */
    boolean getValueIsAdjusting();


    
Returns the model's extent, the length of the inner range that
begins at the model's value.

See Also:
Returns: the value of the model's extent property
/**
     * Returns the model's extent, the length of the inner range that
     * begins at the model's value.
     *
     * @return  the value of the model's extent property
     * @see     #setExtent
     * @see     #setValue
     */
    int getExtent();


    
Sets the model's extent.  The newExtent is forced to
be greater than or equal to zero and less than or equal to
maximum - value.


When a BoundedRange model is used with a scrollbar the extent
defines the length of the scrollbar knob (aka the "thumb" or
"elevator").  The extent usually represents how much of the
object being scrolled is visible. When used with a slider,
the extent determines how much the value can "jump", for
example when the user presses PgUp or PgDn.


Notifies any listeners if the model changes.

Params:
  • newExtent – the model's new extent
See Also:
/**
     * Sets the model's extent.  The <I>newExtent</I> is forced to
     * be greater than or equal to zero and less than or equal to
     * maximum - value.
     * <p>
     * When a BoundedRange model is used with a scrollbar the extent
     * defines the length of the scrollbar knob (aka the "thumb" or
     * "elevator").  The extent usually represents how much of the
     * object being scrolled is visible. When used with a slider,
     * the extent determines how much the value can "jump", for
     * example when the user presses PgUp or PgDn.
     * <p>
     * Notifies any listeners if the model changes.
     *
     * @param  newExtent the model's new extent
     * @see #getExtent
     * @see #setValue
     */
    void setExtent(int newExtent);



    
This method sets all of the model's data with a single method call.
The method results in a single change event being generated. This is
convenient when you need to adjust all the model data simultaneously and
do not want individual change events to occur.

Params:
  • value –  an int giving the current value
  • extent – an int giving the amount by which the value can "jump"
  • min –    an int giving the minimum value
  • max –    an int giving the maximum value
  • adjusting – a boolean, true if a series of changes are in
                   progress
See Also:
/**
     * This method sets all of the model's data with a single method call.
     * The method results in a single change event being generated. This is
     * convenient when you need to adjust all the model data simultaneously and
     * do not want individual change events to occur.
     *
     * @param value  an int giving the current value
     * @param extent an int giving the amount by which the value can "jump"
     * @param min    an int giving the minimum value
     * @param max    an int giving the maximum value
     * @param adjusting a boolean, true if a series of changes are in
     *                    progress
     *
     * @see #setValue
     * @see #setExtent
     * @see #setMinimum
     * @see #setMaximum
     * @see #setValueIsAdjusting
     */
    void setRangeProperties(int value, int extent, int min, int max, boolean adjusting);


    
Adds a ChangeListener to the model's listener list.

Params:
  • x – the ChangeListener to add
See Also:
/**
     * Adds a ChangeListener to the model's listener list.
     *
     * @param x the ChangeListener to add
     * @see #removeChangeListener
     */
    void addChangeListener(ChangeListener x);


    
Removes a ChangeListener from the model's listener list.

Params:
  • x – the ChangeListener to remove
See Also:
/**
     * Removes a ChangeListener from the model's listener list.
     *
     * @param x the ChangeListener to remove
     * @see #addChangeListener
     */
    void removeChangeListener(ChangeListener x);

}