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package javax.swing;

import java.awt.event.*;
import javax.swing.event.*;



A model for a potentially unbounded sequence of object values.  This model
is similar to ListModel however there are some important differences:

    

  •  The number of sequence elements isn't necessarily bounded.

  •  The model doesn't support indexed random access to sequence elements.
     Only three sequence values are accessible at a time: current, next and
     previous.

  •  The current sequence element, can be set.




A SpinnerModel has three properties, only the first is read/write.


  
value
  
The current element of the sequence.
  
nextValue
  
The following element or null if value is the
    last element of the sequence.
  
previousValue
  
The preceding element or null if value is the
    first element of the sequence.


When the value property changes,
ChangeListeners are notified.  SpinnerModel may
choose to notify the ChangeListeners under other circumstances.

Author:Hans Muller
See Also:
Since:1.4
/**
 * A model for a potentially unbounded sequence of object values.  This model
 * is similar to <code>ListModel</code> however there are some important differences:
 * <ul>
 * <li> The number of sequence elements isn't necessarily bounded.
 * <li> The model doesn't support indexed random access to sequence elements.
 *      Only three sequence values are accessible at a time: current, next and
 *      previous.
 * <li> The current sequence element, can be set.
 * </ul>
 * <p>
 * A <code>SpinnerModel</code> has three properties, only the first is read/write.
 * <dl>
 *   <dt><code>value</code>
 *   <dd>The current element of the sequence.
 *
 *   <dt><code>nextValue</code>
 *   <dd>The following element or null if <code>value</code> is the
 *     last element of the sequence.
 *
 *   <dt><code>previousValue</code>
 *   <dd>The preceding element or null if <code>value</code> is the
 *     first element of the sequence.
 * </dl>
 * When the <code>value</code> property changes,
 * <code>ChangeListeners</code> are notified.  <code>SpinnerModel</code> may
 * choose to notify the <code>ChangeListeners</code> under other circumstances.
 *
 * @see JSpinner
 * @see AbstractSpinnerModel
 * @see SpinnerListModel
 * @see SpinnerNumberModel
 * @see SpinnerDateModel
 *
 * @author Hans Muller
 * @since 1.4
 */
public interface SpinnerModel
{
    
The current element of the sequence.  This element is usually
displayed by the editor part of a JSpinner.

See Also:
Returns:the current spinner value.
/**
     * The <i>current element</i> of the sequence.  This element is usually
     * displayed by the <code>editor</code> part of a <code>JSpinner</code>.
     *
     * @return the current spinner value.
     * @see #setValue
     */
    Object getValue();


    
Changes current value of the model, typically this value is displayed
by the editor part of a  JSpinner.
If the SpinnerModel implementation doesn't support
the specified value then an IllegalArgumentException
is thrown.  For example a SpinnerModel for numbers might
only support values that are integer multiples of ten. In
that case, model.setValue(new Number(11))
would throw an exception.

Params:
  • value –  new value for the spinner
Throws:
See Also:
/**
     * Changes current value of the model, typically this value is displayed
     * by the <code>editor</code> part of a  <code>JSpinner</code>.
     * If the <code>SpinnerModel</code> implementation doesn't support
     * the specified value then an <code>IllegalArgumentException</code>
     * is thrown.  For example a <code>SpinnerModel</code> for numbers might
     * only support values that are integer multiples of ten. In
     * that case, <code>model.setValue(new Number(11))</code>
     * would throw an exception.
     *
     * @param value  new value for the spinner
     * @throws IllegalArgumentException if <code>value</code> isn't allowed
     * @see #getValue
     */
    void setValue(Object value);


    
Return the object in the sequence that comes after the object returned
by getValue(). If the end of the sequence has been reached
then return null.  Calling this method does not effect value.

See Also:
Returns:the next legal value or null if one doesn't exist
/**
     * Return the object in the sequence that comes after the object returned
     * by <code>getValue()</code>. If the end of the sequence has been reached
     * then return null.  Calling this method does not effect <code>value</code>.
     *
     * @return the next legal value or null if one doesn't exist
     * @see #getValue
     * @see #getPreviousValue
     */
    Object getNextValue();


    
Return the object in the sequence that comes before the object returned
by getValue().  If the end of the sequence has been reached then
return null. Calling this method does not effect value.

See Also:
Returns:the previous legal value or null if one doesn't exist
/**
     * Return the object in the sequence that comes before the object returned
     * by <code>getValue()</code>.  If the end of the sequence has been reached then
     * return null. Calling this method does not effect <code>value</code>.
     *
     * @return the previous legal value or null if one doesn't exist
     * @see #getValue
     * @see #getNextValue
     */
    Object getPreviousValue();


    
Adds a ChangeListener to the model's listener list.  The
ChangeListeners must be notified when models value
changes.

Params:
  • l – the ChangeListener to add
See Also:
/**
     * Adds a <code>ChangeListener</code> to the model's listener list.  The
     * <code>ChangeListeners</code> must be notified when models <code>value</code>
     * changes.
     *
     * @param l the ChangeListener to add
     * @see #removeChangeListener
     */
    void addChangeListener(ChangeListener l);


    
Removes a ChangeListener from the model's listener list.

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