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141 lines
3.6 KiB
141 lines
3.6 KiB
/*
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* Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package javax.swing;
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import java.util.*;
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import javax.swing.event.*;
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import java.io.Serializable;
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/**
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* This class provides the ChangeListener part of the
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* SpinnerModel interface that should be suitable for most concrete SpinnerModel
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* implementations. Subclasses must provide an implementation of the
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* <code>setValue</code>, <code>getValue</code>, <code>getNextValue</code> and
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* <code>getPreviousValue</code> methods.
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*
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* @see JSpinner
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* @see SpinnerModel
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* @see SpinnerListModel
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* @see SpinnerNumberModel
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* @see SpinnerDateModel
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*
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* @author Hans Muller
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* @since 1.4
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*/
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public abstract class AbstractSpinnerModel implements SpinnerModel, Serializable
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{
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/**
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* Only one ChangeEvent is needed per model instance since the
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* event's only (read-only) state is the source property. The source
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* of events generated here is always "this".
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*/
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private transient ChangeEvent changeEvent = null;
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/**
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* The list of ChangeListeners for this model. Subclasses may
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* store their own listeners here.
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*/
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protected EventListenerList listenerList = new EventListenerList();
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/**
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* Adds a ChangeListener to the model's listener list. The
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* ChangeListeners must be notified when the models value changes.
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*
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* @param l the ChangeListener to add
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* @see #removeChangeListener
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* @see SpinnerModel#addChangeListener
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*/
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public void addChangeListener(ChangeListener l) {
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listenerList.add(ChangeListener.class, l);
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}
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/**
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* Removes a ChangeListener from the model's listener list.
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*
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* @param l the ChangeListener to remove
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* @see #addChangeListener
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* @see SpinnerModel#removeChangeListener
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*/
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public void removeChangeListener(ChangeListener l) {
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listenerList.remove(ChangeListener.class, l);
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}
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/**
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* Returns an array of all the <code>ChangeListener</code>s added
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* to this AbstractSpinnerModel with addChangeListener().
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*
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* @return all of the <code>ChangeListener</code>s added or an empty
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* array if no listeners have been added
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* @since 1.4
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*/
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public ChangeListener[] getChangeListeners() {
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return listenerList.getListeners(ChangeListener.class);
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}
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/**
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* Run each ChangeListeners stateChanged() method.
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*
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* @see #setValue
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* @see EventListenerList
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*/
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protected void fireStateChanged()
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{
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Object[] listeners = listenerList.getListenerList();
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for (int i = listeners.length - 2; i >= 0; i -=2 ) {
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if (listeners[i] == ChangeListener.class) {
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if (changeEvent == null) {
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changeEvent = new ChangeEvent(this);
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}
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((ChangeListener)listeners[i+1]).stateChanged(changeEvent);
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}
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}
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}
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/**
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* Return an array of all the listeners of the given type that
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* were added to this model. For example to find all of the
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* ChangeListeners added to this model:
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* <pre>
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* myAbstractSpinnerModel.getListeners(ChangeListener.class);
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* </pre>
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*
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* @param listenerType the type of listeners to return, e.g. ChangeListener.class
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* @return all of the objects receiving <em>listenerType</em> notifications
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* from this model
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*/
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public <T extends EventListener> T[] getListeners(Class<T> listenerType) {
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return listenerList.getListeners(listenerType);
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}
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}
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