/*
* Copyright (c) 1998, 2001, 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
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*/
package javax.swing.colorchooser;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.Color;
import java.io.Serializable;
/**
* A generic implementation of <code>ColorSelectionModel</code>.
*
* @author Steve Wilson
*
* @see java.awt.Color
*/
public class DefaultColorSelectionModel implements ColorSelectionModel, Serializable {
/**
* Only one <code>ChangeEvent</code> 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 <code>DefaultColorSelectionModel</code> with the
* current color set to <code>Color.white</code>. This is
* the default constructor.
*/
public DefaultColorSelectionModel() {
selectedColor = Color.white;
}
/**
* Creates a <code>DefaultColorSelectionModel</code> with the
* current color set to <code>color</code>, which should be
* non-<code>null</code>. Note that setting the color to
* <code>null</code> is undefined and may have unpredictable
* results.
*
* @param color the new <code>Color</code>
*/
public DefaultColorSelectionModel(Color color) {
selectedColor = color;
}
/**
* Returns the selected <code>Color</code> which should be
* non-<code>null</code>.
*
* @return the selected <code>Color</code>
*/
public Color getSelectedColor() {
return selectedColor;
}
/**
* Sets the selected color to <code>color</code>.
* Note that setting the color to <code>null</code>
* is undefined and may have unpredictable results.
* This method fires a state changed event if it sets the
* current color to a new non-<code>null</code> color;
* if the new color is the same as the current color,
* no event is fired.
*
* @param color the new <code>Color</code>
*/
public void setSelectedColor(Color color) {
if (color != null && !selectedColor.equals(color)) {
selectedColor = color;
fireStateChanged();
}
}
/**
* Adds a <code>ChangeListener</code> to the model.
*
* @param l the <code>ChangeListener</code> to be added
*/
public void addChangeListener(ChangeListener l) {
listenerList.add(ChangeListener.class, l);
}
/**
* Removes a <code>ChangeListener</code> from the model.
* @param l the <code>ChangeListener</code> to be removed
*/
public void removeChangeListener(ChangeListener l) {
listenerList.remove(ChangeListener.class, l);
}
/**
* Returns an array of all the <code>ChangeListener</code>s added
* to this <code>DefaultColorSelectionModel</code> with
* <code>addChangeListener</code>.
*
* @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 (ChangeListener[])listenerList.getListeners(
ChangeListener.class);
}
/**
* Runs each <code>ChangeListener</code>'s
* <code>stateChanged</code> method.
*
* <!-- @see #setRangeProperties //bad link-->
* @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);
}
}
}
}