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package javax.swing;
import java.util.*;
import javax.swing.event.*;
import java.io.Serializable;
This class provides the ChangeListener part of the
SpinnerModel interface that should be suitable for most concrete SpinnerModel
implementations. Subclasses must provide an implementation of the
setValue, getValue, getNextValue and
getPreviousValue methods.
Author: Hans Muller See Also: Since: 1.4
/**
* This class provides the ChangeListener part of the
* SpinnerModel interface that should be suitable for most concrete SpinnerModel
* implementations. Subclasses must provide an implementation of the
* <code>setValue</code>, <code>getValue</code>, <code>getNextValue</code> and
* <code>getPreviousValue</code> methods.
*
* @see JSpinner
* @see SpinnerModel
* @see SpinnerListModel
* @see SpinnerNumberModel
* @see SpinnerDateModel
*
* @author Hans Muller
* @since 1.4
*/
@SuppressWarnings("serial") // Field contents are not serializable across versions
public abstract class AbstractSpinnerModel implements SpinnerModel, Serializable
{
Only one ChangeEvent is needed per model instance since the
event's only (read-only) state is the source property. The source
of events generated here is always "this".
/**
* Only one ChangeEvent is needed per model instance since the
* event's only (read-only) state is the source property. The source
* of events generated here is always "this".
*/
private transient ChangeEvent changeEvent = null;
The list of ChangeListeners for this model. Subclasses may
store their own listeners here.
/**
* The list of ChangeListeners for this model. Subclasses may
* store their own listeners here.
*/
protected EventListenerList listenerList = new EventListenerList();
Adds a ChangeListener to the model's listener list. The
ChangeListeners must be notified when the models value changes.
Params: - l – the ChangeListener to add
See Also:
/**
* Adds a ChangeListener to the model's listener list. The
* ChangeListeners must be notified when the models value changes.
*
* @param l the ChangeListener to add
* @see #removeChangeListener
* @see SpinnerModel#addChangeListener
*/
public void addChangeListener(ChangeListener l) {
listenerList.add(ChangeListener.class, l);
}
Removes a ChangeListener from the model's listener list.
Params: - l – the ChangeListener to remove
See Also:
/**
* Removes a ChangeListener from the model's listener list.
*
* @param l the ChangeListener to remove
* @see #addChangeListener
* @see SpinnerModel#removeChangeListener
*/
public void removeChangeListener(ChangeListener l) {
listenerList.remove(ChangeListener.class, l);
}
Returns an array of all the ChangeListeners added
to this AbstractSpinnerModel with addChangeListener().
Returns: all of the ChangeListeners added or an empty
array if no listeners have been added Since: 1.4
/**
* Returns an array of all the <code>ChangeListener</code>s added
* to this AbstractSpinnerModel with addChangeListener().
*
* @return all of the <code>ChangeListener</code>s added or an empty
* array if no listeners have been added
* @since 1.4
*/
public ChangeListener[] getChangeListeners() {
return listenerList.getListeners(ChangeListener.class);
}
Run each ChangeListeners stateChanged() method.
See Also: - setValue
- EventListenerList
/**
* Run each ChangeListeners stateChanged() method.
*
* @see #setValue
* @see EventListenerList
*/
protected void fireStateChanged()
{
Object[] listeners = listenerList.getListenerList();
for (int i = listeners.length - 2; i >= 0; i -=2 ) {
if (listeners[i] == ChangeListener.class) {
if (changeEvent == null) {
changeEvent = new ChangeEvent(this);
}
((ChangeListener)listeners[i+1]).stateChanged(changeEvent);
}
}
}
Return an array of all the listeners of the given type that
were added to this model. For example to find all of the
ChangeListeners added to this model:
myAbstractSpinnerModel.getListeners(ChangeListener.class);
Params: - listenerType – the type of listeners to return, e.g. ChangeListener.class
Type parameters: - <T> – the type of requested listeners
Returns: all of the objects receiving listenerType notifications
from this model
/**
* Return an array of all the listeners of the given type that
* were added to this model. For example to find all of the
* ChangeListeners added to this model:
* <pre>
* myAbstractSpinnerModel.getListeners(ChangeListener.class);
* </pre>
*
* @param <T> the type of requested listeners
* @param listenerType the type of listeners to return, e.g. ChangeListener.class
* @return all of the objects receiving <em>listenerType</em> notifications
* from this model
*/
public <T extends EventListener> T[] getListeners(Class<T> listenerType) {
return listenerList.getListeners(listenerType);
}
}