/*
* Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package javax.swing.colorchooser;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.Color;
import java.io.Serializable;
/**
* A generic implementation of ColorSelectionModel
.
*
* @author Steve Wilson
*
* @see java.awt.Color
*/
@SuppressWarnings("serial") // Same-version serialization only
public class DefaultColorSelectionModel implements ColorSelectionModel, 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".
*/
protected transient ChangeEvent changeEvent = null;
protected EventListenerList listenerList = new EventListenerList();
private Color selectedColor;
/**
* Creates a DefaultColorSelectionModel
with the
* current color set to Color.white
. This is
* the default constructor.
*/
public DefaultColorSelectionModel() {
selectedColor = Color.white;
}
/**
* Creates a DefaultColorSelectionModel
with the
* current color set to color
, which should be
* non-null
. Note that setting the color to
* null
is undefined and may have unpredictable
* results.
*
* @param color the new Color
*/
public DefaultColorSelectionModel(Color color) {
selectedColor = color;
}
/**
* Returns the selected Color
which should be
* non-null
.
*
* @return the selected Color
*/
public Color getSelectedColor() {
return selectedColor;
}
/**
* Sets the selected color to color
.
* Note that setting the color to null
* is undefined and may have unpredictable results.
* This method fires a state changed event if it sets the
* current color to a new non-null
color;
* if the new color is the same as the current color,
* no event is fired.
*
* @param color the new Color
*/
public void setSelectedColor(Color color) {
if (color != null && !selectedColor.equals(color)) {
selectedColor = color;
fireStateChanged();
}
}
/**
* Adds a ChangeListener
to the model.
*
* @param l the ChangeListener
to be added
*/
public void addChangeListener(ChangeListener l) {
listenerList.add(ChangeListener.class, l);
}
/**
* Removes a ChangeListener
from the model.
* @param l the ChangeListener
to be removed
*/
public void removeChangeListener(ChangeListener l) {
listenerList.remove(ChangeListener.class, l);
}
/**
* Returns an array of all the ChangeListener
s added
* to this DefaultColorSelectionModel
with
* addChangeListener
.
*
* @return all of the ChangeListener
s added, or an empty
* array if no listeners have been added
* @since 1.4
*/
public ChangeListener[] getChangeListeners() {
return listenerList.getListeners(ChangeListener.class);
}
/**
* Runs each ChangeListener
's
* stateChanged
method.
*
*
* @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);
}
}
}
}